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  • 51. Beställ onlineKöp publikationen >>
    Björnsson, Andreas
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska fakulteten.
    Automated layup and forming of prepreg laminates2017Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [sv]

    Polymera kolfiberkompositer erbjuder en eftertraktad kombination av låg vikt och högstyrka som kan bidra till lättviktskonstruktioner som t.ex. kan leda till bränslebesparingarför passagerarflygplan. Inom flygindustrin har användningen av denna materialtyp ökatkraftigt med introduktionen av en ny generation flygplan som till mer än hälften består avkompositmaterial. Den ökade användningen av polymera fiberkompositer medför ett ökatbehov av rationella produktionsmetoder.

    Inom flygindustrin tillverkas ofta polymera kolfiberkompositprodukter av så kallatprepreg-material som består av kolfibrer impregnerade med en plast. Det finns tvåhuvudalternativ för automatisk tillverkning av prepreg-baserade produkter, automatisktejpläggning eller automatisk fiberplacering. De två alternativen har tekniskabegränsningar och är förknippade med mycket höga investeringskostnader vilket gör attdet finns produkter som de inte kan tillverka eller som inte är kostnadseffektiva atttillverka med dessa två metoder. Andra automatiska alternativ har utvecklats, men har intenått någon större industriell implementering. Bristen på automatiseradetillverkningsalternativ leder till att produkter med komplex form, och som tillverkas i småoch medelstora volymer ofta tillverkas manuellt.

    Forskningen som presenteras i denna avhandling syftar till att undersöka hur automatiskatillverkningsceller för tillverkning av polymera kolfiberkompositprodukter med komplexform kan utformas så att de uppfyller de krav som gäller för tillverkningen av produkterför flygindustrin och är lämpliga för låga och medelhöga tillverkningsvolymer. Endemonstratorcentrerad forskningsmetod har använt för att utforska området och ett flertaldemonstratorer har byggts och testats tillsammans med partners från industrin och andraforskningsorganisationer. Demonstratorerna, som är kompletta tillverkningsceller, haranvänts för att identifiera metoder och utrustning som är nödvändiga att utveckla för attautomatisera denna typ av tillverkning och för att undersöka några metoder och tillhörandeutrustning mer i detalj. Demonstratorerna har också använts för att kartlägga faktorer sompåverkar hur metoder och utrustning utformas.

    Automatisk tillverkning av produkter med komplex form kan förenklas genom att delaupp tillverkningen i två steg. Först läggs prepreg-ark ihop till ett laminat som formas tillproduktens form i ett efterföljande steg. För att automatisera denna typ av tillverkningbehöver nyckelmetoder och nyckelutrustning för hopläggning av laminat, borttagning avskyddspapper samt formning av laminat till komplexa former utvecklas. Viktiga faktorersom påverkar utformningen av tillverkningscellerna är prepreg-materialens låga styvhetoch klibbiga yta, de höga kvalitetskrav som gäller för tillverkning avflygplanskomponenter samt att systemen måste hantera en stor mängd olikformadeprepreg-ark. Demonstratorerna visar att det är möjligt att automatisera tillverkningen avpolymera kolfiberprodukter med komplex form genom automatisk uppläggning ochformning av plana laminat. Tester med demonstratorerna pekar på att det är möjligt atttillverka produkterna i enlighet med de kvalitetskrav som finns för manuell tillverkningav liknande produkter.

    Delarbeten
    1. Composite Manufacturing: How Improvement Work Might Lead to Renewed Product Validation
    Öppna denna publikation i ny flik eller fönster >>Composite Manufacturing: How Improvement Work Might Lead to Renewed Product Validation
    2012 (Engelska)Ingår i: Proceedings of the 5th International Swedish Production Symposium / [ed] Mats Björkman, 2012, s. 505-513Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    High-performance polymer composites are mainly used in applications where the benefits of high strength and low weight justify the high material and manufacturing costs. Many of these applications are found today in the aerospace, space and defense industries. Most of today’s commonly used manufacturing methods within this area are highly labor intensive. Furthermore, the quality requirements from the customers require a high level of process control. The purpose of this paper is to explore how changes that are introduced in order to improve productivity in a manufacturing system are managed, particularly with regard to who takes the decision to implement a change and how a change is validated. The study is based on qualitative interviews performed at several companies that manufacture composite components for the aerospace, space and defense sectors. The findings show that the responsibility for deciding to implement a change and the need for validating it are based on many diverse and interconnected factors. Therefore, it is difficult to construct guidelines for early assessment of the scope and cost of a proposed change. Hence each individual change request must be evaluated on its own. The study also shows that the validation process can be adapted to a level that is based on the type of change. In addition, it highlights that control over process parameters in manufacturing is essential.

    Nyckelord
    composite manufacturing, validation, change request management
    Nationell ämneskategori
    Produktionsteknik, arbetsvetenskap och ergonomi
    Identifikatorer
    urn:nbn:se:liu:diva-85268 (URN)978-91-7519-752-4 (ISBN)
    Konferens
    5th International Swedish Production Symposium (SPS 2012), 6-8 November 2012, Linköping, Sweden
    Tillgänglig från: 2012-11-14 Skapad: 2012-11-14 Senast uppdaterad: 2017-05-17
    2. Automated Removal of Prepreg Backing Paper - A Sticky Problem
    Öppna denna publikation i ny flik eller fönster >>Automated Removal of Prepreg Backing Paper - A Sticky Problem
    2013 (Engelska)Ingår i: Proceedings of the SAE 2013, Aerotech Congress and Exhibition, 24th-26th September 2013, Montreal,Canada, 2013Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    Automated solutions for manufacturing composite products based on prepreg often imply Automatic Fiber Placement or Automatic Tape Laying. These systems are generally associated with huge investments. For certain manufacturing applications it is interesting to investigate alternatives to find simpler and less costly automation. One example of an automated system could be the use of a standard industrial robot to pick single prepreg plies from an automated cutting machine and stack them to form a plane laminate. This paper is based on a case illustrating a product from the aircraft manufacturing industry. The case will demonstrate a pick and place concept on a general level and illustrate challenges that must be solved. The challenge selected to be the main focus for this paper is an automated process for backing paper removal. A literature review of different gripping technologies reveals several interesting technologies, and the most promising are tested for backing paper removal. The tests show that an automated removal process can be designed by using standard vacuum grippers in combination with mechanical clamping grippers. In order to lift the backing paper with a vacuum gripper an initial separation between the backing paper and prepreg is needed. This separation is most easily mechanically induced by bending the material. The proposed solution for automatic backing paper removal can be integrated in a manufacturing cell for manufacturing of the studied product.

    Nyckelord
    composite manufacturing, automation, prepreg, gripping technology
    Nationell ämneskategori
    Produktionsteknik, arbetsvetenskap och ergonomi
    Identifikatorer
    urn:nbn:se:liu:diva-99344 (URN)10.4271/2013-01-2289 (DOI)
    Konferens
    SAE 2013 Aerotech Congress and Exhibition, September 24-26, 2013, Montréal, Quebec, Canada
    Anmärkning

    SAE Technical Paper 2013-01-2289

    Tillgänglig från: 2013-10-16 Skapad: 2013-10-16 Senast uppdaterad: 2017-05-17Bibliografiskt granskad
    3. Automation of Composite Manufacturing Using Off-the-shelf Solutions, Three Cases from the Aerospace Industry
    Öppna denna publikation i ny flik eller fönster >>Automation of Composite Manufacturing Using Off-the-shelf Solutions, Three Cases from the Aerospace Industry
    2015 (Engelska)Ingår i: Proceedings of the 20th International Conference on Composite Materials, 2015Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
    Abstract [en]

    With an increased use of composite materials follows a need for rational, cost-efficient manufacturing processes. This paper explores how off-the-shelf solutions, developed for other purposes than composite manufacturing, can be used to build systems for automated composite manufacturing. Three demonstrators, each of them dealing with a specific type of material and all of them representing different manufacturing technologies for automated composite manufacturing, are presented and analyzed to find aspects that affect the ability to use off-the-shelf solutions. The three demonstrators target low to medium manufacturing volumes of complex products and they have been developed in collaboration with industrial partners within the aerospace industry. The conclusions drawn from the development of the demonstrators are that it is technically feasible to use off-the-shelf solutions in the three cases while adhering to the high quality standards of the industry. Furthermore three groups of aspects, quality aspects, product aspects and system aspects, which affect the ability to use off-the-shelf solutions for automated composite manufacturing, are identified.

    Nyckelord
    composite manufacturing, automation, off-the-shelf, aerospace
    Nationell ämneskategori
    Produktionsteknik, arbetsvetenskap och ergonomi
    Identifikatorer
    urn:nbn:se:liu:diva-120300 (URN)
    Konferens
    ICCM20 - The 20th International Conference on Composite Materials, 19-24th July 2015, Copenhagen Denmark
    Tillgänglig från: 2015-07-27 Skapad: 2015-07-27 Senast uppdaterad: 2023-02-02
    4. Low-cost Automation for Prepreg Handling - Two Cases from the Aerospace Industry
    Öppna denna publikation i ny flik eller fönster >>Low-cost Automation for Prepreg Handling - Two Cases from the Aerospace Industry
    2016 (Engelska)Ingår i: SAE International Journal of Materials & Manufacturing, ISSN 1946-3979, E-ISSN 1946-3987, Vol. 9, nr 1, s. 68-74Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    With an increased use of composite materials within the aerospace industry follows a need for rational and cost-effective methods forcomposite manufacturing. Manual operations are still common for low to medium manufacturing volumes and complex products.Manual operations can for example be found in material handling, when picking prepreg plies from a cutter table and stacking them toform a plane laminate in preparation for a subsequent forming operation. Stacking operations of this kind often involves a greatnumber of different ply geometries and removal of backing paper and other protecting materials like plastic. In this paper two differentdemonstrator cells for automated picking of prepreg plies and stacking of plane laminates are presented. One demonstrator is utilizinga standard industrial robot and an advanced end-effector to handle the ply variants. The other demonstrator is using a dual arm robotwhich allow for simpler end-effector design. In combination with a previously developed system for automated removal of backingpapers both systems have shown to be capable of automatically picking prepreg plies from a plane surface and stack them to generate aflat multistack laminate. The dual arm approach has shown advantageous since it result in simpler end-effector design and a successivelay down sequence that result in good adhesion between the plies in the laminate.

    Ort, förlag, år, upplaga, sidor
    Warrendale, USA: SAE International, 2016
    Nyckelord
    Composite, Manufacturing, Automation, Low-cost, Prepreg
    Nationell ämneskategori
    Produktionsteknik, arbetsvetenskap och ergonomi
    Identifikatorer
    urn:nbn:se:liu:diva-121602 (URN)10.4271/2015-01-2606 (DOI)000386445700008 ()
    Tillgänglig från: 2015-09-28 Skapad: 2015-09-28 Senast uppdaterad: 2023-02-02Bibliografiskt granskad
    5. Robot-Forming of Prepreg Stacks ‐ Development of Equipment and Methods
    Öppna denna publikation i ny flik eller fönster >>Robot-Forming of Prepreg Stacks ‐ Development of Equipment and Methods
    Visa övriga...
    2016 (Engelska)Ingår i: Proceedings of the 17th European Conference on Composite Materials (ECCM17), 2016Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
    Abstract [en]

    Within the aerospace industry the manufacturing of composite components with complex shapes, such as spars, ribs and beams are often manufactured using manual layup and forming of prepreg material. Automated processes for prepreg layup and efficient forming techniques like vacuum forming are sometimes difficult to employ to these type of products due to technical limitations. This paper describes the development of tools and the forming sequence needed to automate sequential forming of a complex shape using an industrial robot. Plane prepreg stacks are formed to the final shape using a dual-arm industrial robot equipped with rolling tools. Tests show that the developed tools and the employed sequence can be used to form stacks to the desired shape with acceptable quality.

    Nationell ämneskategori
    Produktionsteknik, arbetsvetenskap och ergonomi
    Identifikatorer
    urn:nbn:se:liu:diva-129925 (URN)
    Konferens
    ECCM17 - 17th European Conference on Composite Materials 26-30th June 2016, Munich, Germany
    Tillgänglig från: 2016-07-01 Skapad: 2016-07-01 Senast uppdaterad: 2023-02-02Bibliografiskt granskad
    Ladda ner fulltext (pdf)
    fulltext
    Ladda ner (pdf)
    omslag
    Ladda ner (jpg)
    presentationsbild
  • 52.
    Björnsson, Andreas
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska högskolan.
    Enabling Automation of Composite Manufacturing through the Use of Off-The-Shelf Solutions2014Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Composite materials offer an appealing combination of low weight and high strength that is especially sought after in high-performance applications. The use of composite materials has and is continuing to increase, and the use of the material has been shown to provide substantial weight savings in for example aircraft design. With an increased use of composite materials follows an increased demand for cost-efficient manufacturing methods.

    Composite products are in many cases manufactured either by manual operations or by the use of complex automated solutions associated with high investment costs. The objective for this research is to explore an approach to develop automated composite manufacturing based on commercially available off-the-shelf solutions as an alternative to the existing automated solutions for composite manufacturing.

    The research, which was carried out in collaboration with industrial partners within the aerospace sector, is based on a demonstrator-centered research approach. Three conceptual demonstrators, focusing on three different manufacturing methods and a number of physical demonstrators, are used to show that off-the-shelf solutions can be used for automated manufacturing of composite products.

    Two aspects that affect if it is possible to use off-the-shelf solutions for automated composite manufacturing are the rigorous quality standards used by the aerospace industry and the great variety in product properties and material properties that is associated with composite manufacturing.

    The advantages in using off-the-shelf solutions has shown to be that the solutions generally are associated with low investments and that published information about the solutions, and the solutions themselves, is generally available for evaluation and testing. When working with the demonstrators it has been shown to be useful to break down a manufacturing system into basic tasks and consider off-the-shelf solutions for each particular task. This approach facilitates the search for a suitable off-the-shelf solution to solve a particular task. However, each of the separate tasks can affect other areas of the manufacturing system, and an overall systems perspective is required to find solutions that are compatible with the entire manufacturing system.

    Delarbeten
    1. Automated Removal of Prepreg Backing Paper - A Sticky Problem
    Öppna denna publikation i ny flik eller fönster >>Automated Removal of Prepreg Backing Paper - A Sticky Problem
    2013 (Engelska)Ingår i: Proceedings of the SAE 2013, Aerotech Congress and Exhibition, 24th-26th September 2013, Montreal,Canada, 2013Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    Automated solutions for manufacturing composite products based on prepreg often imply Automatic Fiber Placement or Automatic Tape Laying. These systems are generally associated with huge investments. For certain manufacturing applications it is interesting to investigate alternatives to find simpler and less costly automation. One example of an automated system could be the use of a standard industrial robot to pick single prepreg plies from an automated cutting machine and stack them to form a plane laminate. This paper is based on a case illustrating a product from the aircraft manufacturing industry. The case will demonstrate a pick and place concept on a general level and illustrate challenges that must be solved. The challenge selected to be the main focus for this paper is an automated process for backing paper removal. A literature review of different gripping technologies reveals several interesting technologies, and the most promising are tested for backing paper removal. The tests show that an automated removal process can be designed by using standard vacuum grippers in combination with mechanical clamping grippers. In order to lift the backing paper with a vacuum gripper an initial separation between the backing paper and prepreg is needed. This separation is most easily mechanically induced by bending the material. The proposed solution for automatic backing paper removal can be integrated in a manufacturing cell for manufacturing of the studied product.

    Nyckelord
    composite manufacturing, automation, prepreg, gripping technology
    Nationell ämneskategori
    Produktionsteknik, arbetsvetenskap och ergonomi
    Identifikatorer
    urn:nbn:se:liu:diva-99344 (URN)10.4271/2013-01-2289 (DOI)
    Konferens
    SAE 2013 Aerotech Congress and Exhibition, September 24-26, 2013, Montréal, Quebec, Canada
    Anmärkning

    SAE Technical Paper 2013-01-2289

    Tillgänglig från: 2013-10-16 Skapad: 2013-10-16 Senast uppdaterad: 2017-05-17Bibliografiskt granskad
    2. Three-Dimensional Ultrasonic Cutting of RTM-Preforms – A Part of a High Volume Production System
    Öppna denna publikation i ny flik eller fönster >>Three-Dimensional Ultrasonic Cutting of RTM-Preforms – A Part of a High Volume Production System
    2013 (Engelska)Ingår i: Proceedings of the 19th International Conference on Composite Materials, 28th July - 2nd August 2013, Montreal, Canada: Composite Materials:The Great Advance / [ed] Suong Van Hoa & Pascal Hubert, Electronic Publishing BytePress.com , 2013, s. 8960-8969Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    The process parameters for an automated, three-dimensional ultrasonic cutting process of RTM-preforms are examined in order to find how they affect the cutting quality.

    Ort, förlag, år, upplaga, sidor
    Electronic Publishing BytePress.com, 2013
    Nyckelord
    composite manufacturing, ultrasonic cutting, preform, RTM, automation
    Nationell ämneskategori
    Produktionsteknik, arbetsvetenskap och ergonomi
    Identifikatorer
    urn:nbn:se:liu:diva-95875 (URN)978-0-9696797-1-4 (ISBN)
    Konferens
    19th International Conference on Composite Materials (ICCM19), July 28 - August 2, 2013, Montréal, Canada
    Tillgänglig från: 2013-08-05 Skapad: 2013-08-05 Senast uppdaterad: 2016-09-26
    3. Automated Composite Manufacturing Using Off-the-shelf Automation Equipment – A Case from the Space Industry
    Öppna denna publikation i ny flik eller fönster >>Automated Composite Manufacturing Using Off-the-shelf Automation Equipment – A Case from the Space Industry
    2014 (Engelska)Ingår i: Proceedings of the 16th European Conference on Composite Materials, 22nd-26th June 2014, Seville, Spain, 2014Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    A novel approach to the manufacturing of composite products using off-the-shelf automation equipment is explored in this article. A manufacturing concept for a specific product is developed and analyzed, from a technical perspective, in order to find areas where off-the-shelf automation equipment can be used. The article also highlights areas where case-specific solutions need to be developed. In this particular case, off-the-shelf automation equipment can be used for most of the tasks that the manufacturing system needs to perform. The most challenging process is identified as the application of adhesive. The manufacturing concept described in the article shows that it is possible to build a system for the manufacturing of composite components using a high degree of off-the-shelf automation equipment.

    Nyckelord
    composite, automation, off-the-shelf, adhesive joining
    Nationell ämneskategori
    Produktionsteknik, arbetsvetenskap och ergonomi
    Identifikatorer
    urn:nbn:se:liu:diva-109107 (URN)978-84-616-9798-4 (ISBN)
    Konferens
    16th European Conference on Composite Materials (ECCM16), June 22-26, 2014, Seville, Spain
    Tillgänglig från: 2014-08-08 Skapad: 2014-08-08 Senast uppdaterad: 2016-09-26
    4. Composite Manufacturing: How Improvement Work Might Lead to Renewed Product Validation
    Öppna denna publikation i ny flik eller fönster >>Composite Manufacturing: How Improvement Work Might Lead to Renewed Product Validation
    2012 (Engelska)Ingår i: Proceedings of the 5th International Swedish Production Symposium / [ed] Mats Björkman, 2012, s. 505-513Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    High-performance polymer composites are mainly used in applications where the benefits of high strength and low weight justify the high material and manufacturing costs. Many of these applications are found today in the aerospace, space and defense industries. Most of today’s commonly used manufacturing methods within this area are highly labor intensive. Furthermore, the quality requirements from the customers require a high level of process control. The purpose of this paper is to explore how changes that are introduced in order to improve productivity in a manufacturing system are managed, particularly with regard to who takes the decision to implement a change and how a change is validated. The study is based on qualitative interviews performed at several companies that manufacture composite components for the aerospace, space and defense sectors. The findings show that the responsibility for deciding to implement a change and the need for validating it are based on many diverse and interconnected factors. Therefore, it is difficult to construct guidelines for early assessment of the scope and cost of a proposed change. Hence each individual change request must be evaluated on its own. The study also shows that the validation process can be adapted to a level that is based on the type of change. In addition, it highlights that control over process parameters in manufacturing is essential.

    Nyckelord
    composite manufacturing, validation, change request management
    Nationell ämneskategori
    Produktionsteknik, arbetsvetenskap och ergonomi
    Identifikatorer
    urn:nbn:se:liu:diva-85268 (URN)978-91-7519-752-4 (ISBN)
    Konferens
    5th International Swedish Production Symposium (SPS 2012), 6-8 November 2012, Linköping, Sweden
    Tillgänglig från: 2012-11-14 Skapad: 2012-11-14 Senast uppdaterad: 2017-05-17
    Ladda ner fulltext (pdf)
    Enabling Automation of Composite Manufacturing through the Use of Off-The-Shelf Solutions
    Ladda ner (pdf)
    omslag
    Ladda ner (jpg)
    presentationsbild
  • 53.
    Björnsson, Andreas
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska högskolan.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska högskolan.
    Composite Manufacturing: How Improvement Work Might Lead to Renewed Product Validation2012Ingår i: Proceedings of the 5th International Swedish Production Symposium / [ed] Mats Björkman, 2012, s. 505-513Konferensbidrag (Refereegranskat)
    Abstract [en]

    High-performance polymer composites are mainly used in applications where the benefits of high strength and low weight justify the high material and manufacturing costs. Many of these applications are found today in the aerospace, space and defense industries. Most of today’s commonly used manufacturing methods within this area are highly labor intensive. Furthermore, the quality requirements from the customers require a high level of process control. The purpose of this paper is to explore how changes that are introduced in order to improve productivity in a manufacturing system are managed, particularly with regard to who takes the decision to implement a change and how a change is validated. The study is based on qualitative interviews performed at several companies that manufacture composite components for the aerospace, space and defense sectors. The findings show that the responsibility for deciding to implement a change and the need for validating it are based on many diverse and interconnected factors. Therefore, it is difficult to construct guidelines for early assessment of the scope and cost of a proposed change. Hence each individual change request must be evaluated on its own. The study also shows that the validation process can be adapted to a level that is based on the type of change. In addition, it highlights that control over process parameters in manufacturing is essential.

    Ladda ner fulltext (pdf)
    fulltext
  • 54.
    Björnsson, Andreas
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska högskolan.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Alexandersson, Dan
    GKN Aerospace Applied Composites AB.
    Three-Dimensional Ultrasonic Cutting of RTM-Preforms – A Part of a High Volume Production System2013Ingår i: Proceedings of the 19th International Conference on Composite Materials, 28th July - 2nd August 2013, Montreal, Canada: Composite Materials:The Great Advance / [ed] Suong Van Hoa & Pascal Hubert, Electronic Publishing BytePress.com , 2013, s. 8960-8969Konferensbidrag (Refereegranskat)
    Abstract [en]

    The process parameters for an automated, three-dimensional ultrasonic cutting process of RTM-preforms are examined in order to find how they affect the cutting quality.

    Ladda ner fulltext (pdf)
    fulltext
  • 55.
    Björnsson, Andreas
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska högskolan.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Thuswaldner, Michael
    RUAG Space AB, Linköping, Sweden.
    Automated Composite Manufacturing Using Off-the-shelf Automation Equipment – A Case from the Space Industry2014Ingår i: Proceedings of the 16th European Conference on Composite Materials, 22nd-26th June 2014, Seville, Spain, 2014Konferensbidrag (Refereegranskat)
    Abstract [en]

    A novel approach to the manufacturing of composite products using off-the-shelf automation equipment is explored in this article. A manufacturing concept for a specific product is developed and analyzed, from a technical perspective, in order to find areas where off-the-shelf automation equipment can be used. The article also highlights areas where case-specific solutions need to be developed. In this particular case, off-the-shelf automation equipment can be used for most of the tasks that the manufacturing system needs to perform. The most challenging process is identified as the application of adhesive. The manufacturing concept described in the article shows that it is possible to build a system for the manufacturing of composite components using a high degree of off-the-shelf automation equipment.

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  • 56.
    Björnsson, Andreas
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion.
    Jonsson, Marie
    Swerea Sicomp, Compraser Labs.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Automation of Composite Manufacturing Using Off-the-shelf Solutions, Three Cases from the Aerospace Industry2015Ingår i: Proceedings of the 20th International Conference on Composite Materials, 2015Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    With an increased use of composite materials follows a need for rational, cost-efficient manufacturing processes. This paper explores how off-the-shelf solutions, developed for other purposes than composite manufacturing, can be used to build systems for automated composite manufacturing. Three demonstrators, each of them dealing with a specific type of material and all of them representing different manufacturing technologies for automated composite manufacturing, are presented and analyzed to find aspects that affect the ability to use off-the-shelf solutions. The three demonstrators target low to medium manufacturing volumes of complex products and they have been developed in collaboration with industrial partners within the aerospace industry. The conclusions drawn from the development of the demonstrators are that it is technically feasible to use off-the-shelf solutions in the three cases while adhering to the high quality standards of the industry. Furthermore three groups of aspects, quality aspects, product aspects and system aspects, which affect the ability to use off-the-shelf solutions for automated composite manufacturing, are identified.

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  • 57.
    Björnsson, Andreas
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska fakulteten.
    Jonsson, Marie
    Swerea SICOMP, Sweden.
    Lindbäck, Jan Erik
    Saab Aerostructures, Sweden.
    Åkermo, Malin
    Royal Institute of Technology, KTH, Aeronautical and Vehicle Engineering, Sweden.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Robot-Forming of Prepreg Stacks ‐ Development of Equipment and Methods2016Ingår i: Proceedings of the 17th European Conference on Composite Materials (ECCM17), 2016Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Within the aerospace industry the manufacturing of composite components with complex shapes, such as spars, ribs and beams are often manufactured using manual layup and forming of prepreg material. Automated processes for prepreg layup and efficient forming techniques like vacuum forming are sometimes difficult to employ to these type of products due to technical limitations. This paper describes the development of tools and the forming sequence needed to automate sequential forming of a complex shape using an industrial robot. Plane prepreg stacks are formed to the final shape using a dual-arm industrial robot equipped with rolling tools. Tests show that the developed tools and the employed sequence can be used to form stacks to the desired shape with acceptable quality.

  • 58.
    Björnsson, Andreas
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska fakulteten.
    Lindbäck, Jan Erik
    Saab Aerostructures, Sweden.
    Eklund, Daniel
    Swerea Sicomp, Sweden.
    Jonsson, Marie
    Swerea Sicomp, Sweden.
    Low-cost Automation for Prepreg Handling - Two Cases from the Aerospace Industry2016Ingår i: SAE International Journal of Materials & Manufacturing, ISSN 1946-3979, E-ISSN 1946-3987, Vol. 9, nr 1, s. 68-74Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    With an increased use of composite materials within the aerospace industry follows a need for rational and cost-effective methods forcomposite manufacturing. Manual operations are still common for low to medium manufacturing volumes and complex products.Manual operations can for example be found in material handling, when picking prepreg plies from a cutter table and stacking them toform a plane laminate in preparation for a subsequent forming operation. Stacking operations of this kind often involves a greatnumber of different ply geometries and removal of backing paper and other protecting materials like plastic. In this paper two differentdemonstrator cells for automated picking of prepreg plies and stacking of plane laminates are presented. One demonstrator is utilizinga standard industrial robot and an advanced end-effector to handle the ply variants. The other demonstrator is using a dual arm robotwhich allow for simpler end-effector design. In combination with a previously developed system for automated removal of backingpapers both systems have shown to be capable of automatically picking prepreg plies from a plane surface and stack them to generate aflat multistack laminate. The dual arm approach has shown advantageous since it result in simpler end-effector design and a successivelay down sequence that result in good adhesion between the plies in the laminate.

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  • 59.
    Björnsson, Andreas
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska högskolan.
    Lindbäck, Jan Erik
    Saab Aerostructures.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Automated Removal of Prepreg Backing Paper - A Sticky Problem2013Ingår i: Proceedings of the SAE 2013, Aerotech Congress and Exhibition, 24th-26th September 2013, Montreal,Canada, 2013Konferensbidrag (Refereegranskat)
    Abstract [en]

    Automated solutions for manufacturing composite products based on prepreg often imply Automatic Fiber Placement or Automatic Tape Laying. These systems are generally associated with huge investments. For certain manufacturing applications it is interesting to investigate alternatives to find simpler and less costly automation. One example of an automated system could be the use of a standard industrial robot to pick single prepreg plies from an automated cutting machine and stack them to form a plane laminate. This paper is based on a case illustrating a product from the aircraft manufacturing industry. The case will demonstrate a pick and place concept on a general level and illustrate challenges that must be solved. The challenge selected to be the main focus for this paper is an automated process for backing paper removal. A literature review of different gripping technologies reveals several interesting technologies, and the most promising are tested for backing paper removal. The tests show that an automated removal process can be designed by using standard vacuum grippers in combination with mechanical clamping grippers. In order to lift the backing paper with a vacuum gripper an initial separation between the backing paper and prepreg is needed. This separation is most easily mechanically induced by bending the material. The proposed solution for automatic backing paper removal can be integrated in a manufacturing cell for manufacturing of the studied product.

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  • 60. Beställ onlineKöp publikationen >>
    Blissing, Björn
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Driving in Virtual Reality: Requirements for automotive research and development2020Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [sv]

    Dagens fordon innehåller fler och fler säkerhetssystem. Vissa av dessa system ger varningar i potentiellt kritiska trafiksituationer. Det finns också mer komplexa system som tillfälligt kan ta kontroll över fordonet för att förhindra en olycka eller åtminstone mildra effekterna. Komplexiteten hos dessa system innebär att man måste genomföra omfattande tester. Både för att se att systemen reagerar vid rätt tidpunkt, men också för att se att valet av åtgärd är korrekt.

    Det finns många olika sätt att testa dessa system. Man börjar vanligtvis med simuleringar av programvara och hårdvara. Därefter kan systemet introduceras i ett fordon för att se vilka effekter systemet har när det interagerar med en riktig förare. Att utföra tester med förare ställer dock höga säkerhetskrav, och det är ofta svårt att samordna komplexa trafiksituationer på en testbana. Traditionellt har körsimulatorer varit ett naturligt alternativ eftersom de kan utföra komplexa scenarier i en säker miljö.

    Denna avhandling undersöker en testmetod där man utrustar föraren med en virtual reality-display. Genom att presentera omvärlden med hjälp av virtual reality, så kan man genomföra scenarion som tidigare varit omöjliga på en testbana. Det kan dock finnas inbyggda begränsningar i virtual reality tekniken som kan påverka körbeteendet. Det är därför viktigt att hitta och kvantifiera dessa effekter för att kunna lita på resultaten från testmetoden. Att känna till dessa effekter på körbeteendet dessutom kan hjälpa till att avgöra vilka typer av scenarier som är lämpade för denna testmetod. Det är också viktig information för att avgöra var man bör fokusera den tekniska utvecklingen av testutrustningen.  

    Delarbeten
    1. A Technical Platform using Augmented Reality for Active Safety Testing
    Öppna denna publikation i ny flik eller fönster >>A Technical Platform using Augmented Reality for Active Safety Testing
    2015 (Engelska)Ingår i: 2015 Road Safety & Simulation International Conference Proceedings / [ed] Dr. Essam Radwan, Dr. Mohamed Abdel-Aty, Orlando, USA: University of Central Florida , 2015, s. 793-803Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    This paper describes the design of a video see-through augmented reality system for active safety testing. The development is explained in detail, with focus on the design considerations for the different subsystems. It is shown that it is possible to build a system using available commercial off-the-shelf components, while still maintaining the performance needed for the intended application. Accuracy and resolution requirements of the tracking systems are discussed along with measurement methods. We also examine how to use the hardware efficiently to minimize latency and a device to measure and quantify end-to-end latency has been developed.

    Ort, förlag, år, upplaga, sidor
    Orlando, USA: University of Central Florida, 2015
    Nyckelord
    Active safety system, Test, Simulation, Design (overall design), Characteristics
    Nationell ämneskategori
    Interaktionsteknik
    Forskningsämne
    90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle
    Identifikatorer
    urn:nbn:se:liu:diva-131620 (URN)9781495174452 (ISBN)
    Konferens
    2015 Road Safety & Simulation International Conference
    Forskningsfinansiär
    VINNOVA, 2011-01819]
    Tillgänglig från: 2016-09-28 Skapad: 2016-09-28 Senast uppdaterad: 2020-08-20Bibliografiskt granskad
    2. Effects of Visual Latency on Vehicle Driving Behavior
    Öppna denna publikation i ny flik eller fönster >>Effects of Visual Latency on Vehicle Driving Behavior
    2016 (Engelska)Ingår i: ACM Transactions on Applied Perception, ISSN 1544-3558, E-ISSN 1544-3965, Vol. 14, nr 1, s. 5:1-5:12, artikel-id 5Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Using mixed reality in vehicles provides a potential alternative to using driving simulators when studying driver-vehicle inter- action. However, virtual reality systems introduce latency in the visual system that may alter driving behavior, which, in turn, results in questionable validity. Previous studies have mainly focused on visual latency as a separate phenomenon. In this work, latency is studied from a task-dependent viewpoint to investigate how participants’ driving behavior changed with increased latency. In this study, the investigation was performed through experiments in which regular drivers were subjected to different levels of visual latency while performing a simple slalom driving task. The drivers’ performances were recorded and evaluated in both lateral and longitudinal directions along with self-assessment questionnaires regarding task performance and difficulty. All participants managed to complete the driving tasks successfully, even under high latency conditions, but were clearly affected by the increased visual latency. The results suggest that drivers compensate for longer latencies by steering more and increasing the safety margins but without reducing their speed.

    Ort, förlag, år, upplaga, sidor
    New York, NY, USA: Association for Computing Machinery (ACM), 2016
    Nyckelord
    Driving, Vision, Delay, Variability, Simulator (driving), Performance (road user)
    Nationell ämneskategori
    Interaktionsteknik
    Forskningsämne
    80 Road: Traffic safety and accidents, 841 Road: Road user behaviour
    Identifikatorer
    urn:nbn:se:liu:diva-131621 (URN)10.1145/2971320 (DOI)
    Projekt
    Next Generation Test Methods for Active Safety Functions
    Forskningsfinansiär
    VINNOVA, 2011-01819]
    Tillgänglig från: 2016-08-26 Skapad: 2016-09-28 Senast uppdaterad: 2020-08-20Bibliografiskt granskad
    3. Driver behavior in mixed and virtual reality: A comparative study
    Öppna denna publikation i ny flik eller fönster >>Driver behavior in mixed and virtual reality: A comparative study
    2017 (Engelska)Ingår i: Transportation Research Part F: Traffic Psychology and Behaviour, ISSN 1369-8478, E-ISSN 1873-5517Artikel i tidskrift (Refereegranskat) In press
    Abstract [en]

    This paper presents a comparative study of driving behavior when using different virtual reality modes. Test subjects were exposed to mixed, virtual, and real reality using a head mounted display capable of video see-through, while performing a simple driving task. The driving behavior was quantified in steering and acceleration/deceleration activities, divided into local and global components. There was a distinct effect of wearing a head mounted display, which affected all measured variables. Results show that average speed was the most significant difference between mixed and virtual reality, while the steering behavior was consistent between modes. All subjects but one were able to successfully complete the driving task, suggesting that virtual driving could be a potential complement to driving simulators.

    Ort, förlag, år, upplaga, sidor
    Elsevier Ltd, 2017
    Nyckelord
    Driver, Behaviour, Simulation, Metod, Measurement, Driving, Steering (process), Speed
    Nationell ämneskategori
    Tillämpad psykologi
    Forskningsämne
    80 Road: Traffic safety and accidents, 841 Road: Road user behaviour
    Identifikatorer
    urn:nbn:se:liu:diva-168377 (URN)10.1016/j.trf.2017.08.005 (DOI)2-s2.0-85030032565 (Scopus ID)
    Tillgänglig från: 2017-12-07 Skapad: 2020-08-20 Senast uppdaterad: 2021-11-26
    4. Exploring the suitability of virtual reality for driving simulation
    Öppna denna publikation i ny flik eller fönster >>Exploring the suitability of virtual reality for driving simulation
    2018 (Engelska)Ingår i: Proceedings of the Driving Simulation Conference 2018 / [ed] Andras Kemeny, Frédéric Mérienne, Florent Columbet, Stéphane Espié, Antibes, France, 2018, s. 163-166Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    Head mounted displays (HMDs) is an emerging technology and the availability of affordable systems is growing fast. Replacing projector and large screen solutions with head mounted displays may appear as an appealing solution. However, inherent properties and technical limitations of these systems need to be understood and considered before making the leap to virtual reality.

    This paper outlines some of the most fundamental limitations of head mounted displays relevant to this context, both from a technical and human factors perspective. Desirable properties of scenarios and types of studies are deduced, based on these limitations. Finally, a meta analysis is performed on the feasibility of transferring simulator studies found in the literature to platforms with head mounted displays. The results suggest that a noticeable amount (40%) of the investigated simulator studies could likely have been performed with head mounted displays. This number could be increased further with technical advances in display resolution, display technology, reduction in latency, etc.

    Ort, förlag, år, upplaga, sidor
    Antibes, France: , 2018
    Nyckelord
    Simulator (driving), Driver information, In vehicle information, Technology, Change, Human factor
    Nationell ämneskategori
    Interaktionsteknik
    Forskningsämne
    90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle; 80 Road: Traffic safety and accidents, 84 Road: Road users
    Identifikatorer
    urn:nbn:se:liu:diva-168376 (URN)978-2-85782-734-4 (ISBN)
    Konferens
    Driving Simulation Conference 2018
    Projekt
    Chronos 2
    Tillgänglig från: 2020-08-20 Skapad: 2020-08-20 Senast uppdaterad: 2021-11-26
    5. The Effects on Driving Behavior When Using a Head-Mounted Display in a Dynamic Driving Simulator
    Öppna denna publikation i ny flik eller fönster >>The Effects on Driving Behavior When Using a Head-Mounted Display in a Dynamic Driving Simulator
    2022 (Engelska)Ingår i: ACM Transactions on Applied Perception, ISSN 1544-3558, E-ISSN 1544-3965, Vol. 19, nr 1, s. 1-18Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Driving simulators are established tools used during automotive development and research. Most simulators use either monitors or projectors as their primary display system. However, the emergence of a new generation of head-mounted displays has triggered interest in using these as the primary display type. The general benefits and drawbacks of head-mounted displays are well researched, but their effect on driving behavior in a simulator has not been sufficiently quantified.

    This article presents a study of driving behavior differences between projector-based graphics and head-mounted display in a large dynamic driving simulator. This study has selected five specific driving maneuvers suspected of affecting driving behavior differently depending on the choice of display technology. Some of these maneuvers were chosen to reveal changes in lateral and longitudinal driving behavior. Others were picked for their ability to highlight the benefits and drawbacks of head-mounted displays in a driving context.

    The results show minor changes in lateral and longitudinal driver behavior changes when comparing projectors and a head-mounted display. The most noticeable difference in favor of projectors was seen when the display resolution is critical to the driving task. The choice of display type did not affect simulator sickness nor the realism rated by the subjects.

    Ort, förlag, år, upplaga, sidor
    Association for Computing Machinery, 2022
    Nyckelord
    driver behavior, Head-mounted display, driving simulator
    Nationell ämneskategori
    Interaktionsteknik
    Identifikatorer
    urn:nbn:se:liu:diva-182178 (URN)10.1145/3483793 (DOI)
    Tillgänglig från: 2022-01-10 Skapad: 2022-01-10 Senast uppdaterad: 2022-01-10
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    presentationsbild
  • 61.
    Blom, Per
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik.
    Förstudie av elektrolytpolering vid HZ Rostfria AB2006Självständigt arbete på avancerad nivå (magisterexamen), 20 poäng / 30 hpStudentuppsats
    Abstract [sv]

    Avsikten med examensarbetet har varit att undersöka möjligheter och förutsättningar för verkstadsföretaget HZ Rostfria AB, med verksamhet i Sandviken, att införskaffa utrustning för elektrolytpolering av rostfria detaljer.

    För att kunna få en helhetsbild över hur elektrolytpoleringsbranschen ser ut i Sverige har de företag som öppet annonserar med att de arbetar med elektrolytpolering studerats. Företagen har studerats utifrån en rad kriterier, där den huvudsakliga inriktningen på verksamheten samt företagens läge geografiskt relativt Sandviken ansetts vara de viktigaste.

    Utöver de företag som arbetar med elektrolytpolering har även olika tekniker för att åstadkomma elektrolytpolering studerats. Teknikerna har studerats med de produkter som idag tillverkas, samt som i framtiden skulle kunna komma att tillverkas av HZ Rostfria AB i åtanke.

    I och med att elektrolytpolering klassas som en miljöfarlig verksamhet har även frågor rörande tillstånd för verksamheten studerats. Det primära har varit att studera processen som leder fram till att tillstånd för verksamheten erhålls, vilket per automatik också innefattat att studera vilka insatser som krävs av företaget.

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    FULLTEXT01
  • 62.
    Blomkvist, Pär
    et al.
    Division of Organization and Management, Mälardalen University, Högskoleplan 1, 722 20, Västerås, Sweden.
    Karpouzoglou, Timos
    Division of History of Science, Technology and Environment, KTH Royal Institute of Technology, Stockholm, Sweden.
    Nilsson, David
    KTH, Historiska studier av teknik, vetenskap och miljö.
    Wallin, Jörgen
    KTH, Tillämpad termodynamik och kylteknik.
    Entrepreneurship and alignment work in the Swedish water and sanitation sector2023Ingår i: Technology in society, ISSN 0160-791X, E-ISSN 1879-3274, Vol. 74, artikel-id 102280Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Water and sewage (WS) systems are, like most grid based infrastructural systems, often centralised and hierarchical and the end user has almost no possibility to influence the technical standards, business models or system architecture. The preferred method for connecting new areas to the grid are underground water pipes and gravity flow for sewage. Thus, the WS system is “tightly coupled”. It is hard to change and conservative in its system culture, exhibiting a strong “momentum” or “path dependence”. In this article we investigate an unusual case in the development of WS-systems. As a rule, WS-systems, as most infrastructural systems, develop gradually through incremental innovations, and system owners/utilities traditionally build their systems “from the inside out”. In our case, we investigate a situation where the end users took the initiative to connect a residential area, Aspvik, part of the municipality of Värmdö, outside Stockholm, Sweden, to the municipal grid and thus expand the WS-system, not from the inside out, but from the outside in. Furthermore, we highlight another unusual feature: the role of a resident that acted as the “entrepreneur” in this process of WS-system expansion. The entrepreneur had unique trust building abilities in the local community, which the regime actor (the WS utility), could not match. Historically, inventor-entrepreneurs have been common, acting as “system builders” in the establishment phase of new infrastructural systems. However, entrepreneurs outside the regime are not common in the WS sector. Although atypical in mature WS systems in developed countries, these types of local initiatives or hybrid solutions are common in developing countries. In this article, we argue that there are lessons to be learnt from our case, when dealing with system expansion processes both inside and outside the Global North.

  • 63.
    Boberg, Sofia
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Fredrikson, Tove
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Child Comfort in Rear Seats of Cars: A seating comfort study of how to improve and evaluate older children’s perceived comfort when riding on a belt-positioning booster2017Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    During the last couple of years several studies have been conducted to investigate how children move and position during car rides. This in order to map when, and for how long children sit in positions that are not safe as well as to identify the reason for these movements. One of the conclusions is that children do not always sit comfortable in today’s belt-positioning boosters and thereby they chose positions that are unwanted for safety reasons.

    The aim for the master thesis has thereby been to improve seating comfort for children while traveling safely in the rear seat of a car. The target group has been children in ages 5-11 years old with body height 110-145 cm, a Swedish population 50 percentile has been used for the extreme dimensions.

    The master thesis process is divided in three phases; Discovery, Development and Testing and Evaluation. In the Discovery phase information in the areas child safety, child methodology and comfort was gathered through literature study, interviews with experts, benchmarking and a focus group with parents. As a final step customer needs were formulated. In the Development phase a workshop with children was initially performed to complement the customer needs with inputs from the users. The customer needs were afterwards reformulated into a specification of requirements and five comfort hypotheses. Finally a prototype was developed, designed from the requirements with the purpose to validate the comfort hypotheses, using an anthropometric design method (Osvalder, et al., 2010). In the final phase, Testing and Evaluation, the prototype and reference belt-positioning boosters were evaluated by children in two user studies; one static study and one on road study, to evaluate comfort features and try out different seating comfort evaluation methods.

    The result is divided into child seating comfort characteristics and child seating comfort methodology guidelines. To assist future development of belt-positioning boosters, seven comfort features are defined to help children ride comfortable in a safe position in the car. Furthermore, 13 child methodology guidelines are formulated to help further seating comfort evaluation with children.

    Conclusively to make children sit comfortable and safe positioned in the car they should be seated in a belt-positioning booster with headrest, backrest, seat cushion and foot support, the supporting parts need to be perceived as soft around head, back and under the buttock and all parts need to be dimensioned for all children in the target group. The size of the belt-positioning booster and the combination of foam thickness, foam hardness and shape are the main factors for affecting the perceived seating comfort. Furthermore, children shall be included as both design partners and testers during the development of belt-positioning boosters. During the prototype development static comfort evaluation with children should be done repeatedly to verify measurements, shape and foam hardness. To evaluate comfort both static evaluation and on road evaluation should be performed since comfort varies over time. Data should be collected subjectively from children through quantitative methods, such as rating scales, and qualitative methods, such as general questions regarding comfort/discomfort experience. Video observations can identify children’s position during car rides. Different positions can be timed and together with subjective data reasons for repositioning can be identified.

    Ladda ner fulltext (pdf)
    Child Comfort in Rear Seats of Cars
  • 64.
    Borg, Fredrik
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Stralström, Krister
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Industrikombinat: en affärsmöjlighet för Vattenfall2008Självständigt arbete på avancerad nivå (magisterexamen), 20 poäng / 30 hpStudentuppsats
    Abstract [sv]

    Syftet med detta arbete är att identifiera geografiska platser i Sverige där det finns affärsmöjligheter för Vattenfall med industrikombinat som grundtanke samt definiera industrikombinatets uppbyggnad. Då arbetet skrivs för Vattenfall Elproduktion Norden ska elproduktion ingå i industrikombinatet. Begreppet industrikombinat används i detta arbete för att beskriva samarbeten där restvärme från en produktionsenhet används som primärvärme i en annan produktionsenhet

    Branscherna med störst energianvändning i Sverige anses vara mest intressanta att samarbeta med eftersom det i dessa branscher bör finnas affärsmöjligheter med störst potential. Industrier ur dessa branscher kartläggs och placeras ut på en Sverigekarta för att lokalisera geografiska områden med stor energianvändning. Även enskilda industrier med stora energibehov ur andra branscher placeras ut på kartan. För geografiska områden där affärsmöjligheter identifieras beskrivs det föreslagna industrikombinatets uppbyggnad och nuvärdet av den föreslagna affärsmöjligheten presenteras.

    Affärsmöjligheterna i Grycksbo och området Ludvika och Grängesberg anses mest intressanta med hänsyn till investeringarnas nuvärde och genomförbarhet. I dessa områden genomförs en fördjupad analys. I analyserna optimeras de berörda industriernas värmesamarbeten. Optimeringen görs genom att en modell av energi-systemet för de berörda industrierna byggs upp och optimeras i programmet Modest.

    Affärsmöjligheten i Grycksbo är mycket lönsam. Nuvärdet för den affärsmöjligheten är 613 MSEK sett över en tioårsperiod med 6 % kalkylränta. Affärsmöjligheten är att investera 541 MSEK i en ny kraftvärmeanläggning för att förse Grycksbo Paper med den ånga de behöver. Affärsmöjligheter som liknar denna identifieras också vid pappersbruken i Munkedal och Åsensbruk.

    I Ludvika och Grängesberg är nuvärdet av affärsmöjligheten -12 MSEK sett över en tioårsperiod med 6 % kalkylränta. Affärsmöjligheten är att investera 247 MSEK i en kraftvärmeanläggning och en förbindelse mellan fjärrvärmenäten i Ludvika och Grängesberg. Kraftvärmeanläggningen kan då förse Spendrups med den ånga de behöver samt leverera värme till fjärrvärmenäten. Lönsamheten för denna affärsmöjlighet påverkas kraftigt av investeringskostnaden för kraftvärmeanläggningen. Kostnaden för kraftvärmeanläggningar har stigit mycket de senaste åren. Om kostnaden för kraftvärmeanläggningar skulle sjunka skulle investeringen i Ludvika och Grängesberg vara mer lönsam.

    Vattenfall rekommenderas ta kontakt med Grycksbo Paper samt Arctic Paper i Åsensbruk och Munkedal för att diskutera de affärsmöjligheter som presenteras i denna rapport. Dessutom rekommenderas Vattenfall att föra samtal med Spendrups i Grängesberg angående samarbete och bevaka kostnaden för kraftvärmeanläggningar.

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  • 65. Beställ onlineKöp publikationen >>
    Brambila-Macias, Sergio
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Early stages of designing resource-efficient offerings: An initial view of their analysis and evaluation2018Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    The increasing use of natural resources and the pollution it causes calls for new ways of addressing customer needs. Additionally, a more uncertain and complex world also presents new challenges. In this thesis, these new challenges are tackled through inter and transdisciplinary research, which require more interaction across disciplines to tackle complex phenomena.

    The manner in which companies address customer needs starts from the designing (a multiplestakeholder perspective) of offerings where companies rely on different types of support (guidelines, standards, methods and tools). In this thesis, these offerings, include products, services, systems, and solutions. This plays an important role in the use of natural resources and its impact on the environment. In this Licentiate, I present results to show initial cues on how to design resource-efficient offerings, and more specifically their analysis and evaluation in the early stages of the design process. This type of offerings is suggested to be crucial for the circular economy, which can be understood as a paradigm shift towards sustainability. In this paradigm shift, designing is carried out by taking into account reuse, remanufacture and recycling of products as strategies by multiple stakeholders and companies. Other strategies include providing services, a function or a solution through dematerialization and transmaterialization.

    The methods used in this research are narrative and systematic literature reviews, thematic analysis and a case study. The results show a lack of interdisciplinary research in the academic literature in subjects relevant to the design of resource-efficient offerings. The results also show a need to clarify what transdisciplinary research entails. Moreover, current practice shows that support used by companies needs to consider several factors for it to be useful, for example, the vision of the company, participation of potential users of the support and everyday operations, among other characteristics. Finally, more practical support coming from academia is necessary to improve its use in industry.

    Delarbeten
    1. Interdisciplinary Insights Found for Product/Service System Design
    Öppna denna publikation i ny flik eller fönster >>Interdisciplinary Insights Found for Product/Service System Design
    2016 (Engelska)Ingår i: DS 84: PROCEEDINGS OF THE DESIGN 2016 14TH INTERNATIONAL DESIGN CONFERENCE, VOLS 1-4, The Design Society, 2016, s. 137-144Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    Product/Service System (PSS) is a different way of fulfilling customer needs by providing a bundle of products and services. PSS is by nature an interdisciplinary field of research that needs collaboration across disciplines. This research paper investigates how much interdisciplinary research has been carried in terms of insights used between two important disciplines, namely, Engineering Design and Industrial Marketing. The results show that few insights have been used across disciplines which shows a gap for further research.

    Ort, förlag, år, upplaga, sidor
    The Design Society, 2016
    Serie
    Proceedings of the International Design Conference, ISSN 1847-9073
    Nyckelord
    product-service systems (PSS), interdisciplinary collaboration, engineering design, industrial marketing
    Nationell ämneskategori
    Miljöledning
    Identifikatorer
    urn:nbn:se:liu:diva-135352 (URN)000395390600014 ()
    Konferens
    14th International Design Conference (DESIGN), Dubrovnik, Croatia, May 16-19, 2016
    Forskningsfinansiär
    Mistra - Stiftelsen för miljöstrategisk forskning
    Tillgänglig från: 2017-03-13 Skapad: 2017-03-13 Senast uppdaterad: 2020-11-06Bibliografiskt granskad
    2. Do We Share an Understanding of Transdisciplinarity in Environmental Sustainability Research?
    Öppna denna publikation i ny flik eller fönster >>Do We Share an Understanding of Transdisciplinarity in Environmental Sustainability Research?
    2018 (Engelska)Ingår i: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 170, s. 1399-1403Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    This letter postulated that there is a need to clarify the statement of the journal as a transdisciplinaryplatform. It first provided an understanding of transdisciplinary research based on the literature. Second,it explained why an understanding of transdisciplinarity is important, and how such an understandingwill enhance the research and practice in the topics of the entire journal. Third, taking environmentalsustainability design research as an example subject, it commented on among others six articles publishedin the journal, and showed the relevance of this issue within this example subject. Overall, thisletter is expected to contribute to enhance the quality of the research and practice in the topics of thejournal.

    Ort, förlag, år, upplaga, sidor
    Elsevier, 2018
    Nationell ämneskategori
    Annan naturresursteknik
    Identifikatorer
    urn:nbn:se:liu:diva-142361 (URN)10.1016/j.jclepro.2017.09.226 (DOI)000414879300123 ()
    Projekt
    Mistra REES
    Forskningsfinansiär
    Mistra - Stiftelsen för miljöstrategisk forskning, 2014/16
    Anmärkning

    Funding agencies: Mistra REES (Resource Efficient and Effective Solutions) program - Mistra (The Swedish Foundation for Strategic Environmental Research) [DIA 2014/16]

    Tillgänglig från: 2017-10-28 Skapad: 2017-10-28 Senast uppdaterad: 2021-02-04
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    Early stages of designing resource-efficient offerings: An initial view of their analysis and evaluation
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  • 66.
    Brissaud, Daniel
    et al.
    Grenoble Alpes Univ, France.
    Sakao, Tomohiko
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Riel, Andreas
    Grenoble Alpes Univ, France.
    Erkoyuncu, John Ahmet
    Cranfield Univ, England.
    Designing value-driven solutions: The evolution of industrial product- service systems2022Ingår i: CIRP annals, ISSN 0007-8506, E-ISSN 1726-0604, Vol. 71, nr 2, s. 553-575Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Industrial Product-Service Systems (IPS2) have been increasingly researched and practiced in a variety of fields and sectors. Nevertheless, such solutions are not as significantly implemented as expected by the CIRP keynote in 2010: it is not a dominant business of manufacturing companies today despite their economic and environmental advantages. One reason for this delay is assumed to be that the initial efforts were mainly on business and service when design was an afterthought. The promising digital technologies that have become easily implementable in practice will in the next years facilitate design and implementation of IPS(2 )smartly to satisfy users and contribute to sustainability. This keynote analyses literature and practice in the last decade, aiming to propose the main characteristics of IPS2 of the future and design processes adequate for IPS2. The design process of both production systems for sustainability and high-value systems for sustainable development goals may need to be supported differently than today. The list of recommendations for future research on IPS2 design is provided at the end of the paper. (C) 2022 CIRP. Published by Elsevier Ltd. All rights reserved.

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    fulltext
  • 67.
    Bäckstrand, Jenny
    et al.
    Jönköping University, Sweden.
    Fredriksson, Anna
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    The potential of information sharing to improve supply chain performance inconstruction projects2018Ingår i: EurOMA 2018 Proceedings: To Serve, to Produce and to Servitize in the Era of Networks, Big Data, and Analytics, 2018Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The purpose is toexplore the potential of increased supply chain performance by improved informationsharing between suppliers and contractors in the construction supply chains.Six suppliers are included, representing different combinations of supplyingmaterials and tools for the product or services to support production as wellas few or continuous deliveries during the project. The study show that suppliersneed different information sharing practices if they continuously present atsite or have few deliveries. Based on this and information sharing literature,we have developed a model of what information different suppliers need, includinghow and when to exchange it.

  • 68.
    Calmsund, Mikael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Tillämpning av induktionsuppvärmning i automatisk ytbehandlingsutrustning med termoplast för metalldetaljer2008Självständigt arbete på avancerad nivå (magisterexamen), 20 poäng / 30 hpStudentuppsats
    Abstract [sv]

    Detta examensarbete är utfört vid Korroterm AB som är beläget i Linghem utanför Linköping. Företaget är en mindre underleverantör med cirka 25 anställda som specialiserat sig på ytbehandling av metalldetaljer med termoplast.

    Syftet med detta arbete har varit att undersöka möjligheterna med induktionsuppvärmning för deras produktion och utveckla en effektiv utrustning som tillämpar denna teknik. Ett mål är att utrustningen skall klara att automatiskt hantera och belägga detaljer av en mindre skokartongs (med mått kring 30*30*30cm) storlek.

    Genom litteratur, muntlig kommunikation och praktiskt arbete har studier inom induktionsteknik och termoplastbeläggning utförts. Inriktningen på dessa studier har varit att få förståelse för grunderna, hur de fungerar och vilka begränsningar som finns med teknikerna.

    För framtagning av konceptlösningar till utrustningen har ”Systematisk Konceptutveckling” av Ulf Liedholm används med en viss modifikation. Då problemet lätt blivit väldigt stort och komplicerat föll det sig naturligt att en uppdelning till delsystem gjordes, vilket gav en bättre överblick av hela systemet. Ett antal koncept togs fram för varje delsystem för att sedan sammanställas till en konceptlösning för hela utrustningen.

    Som resultat av examensarbetet ges en rekommendation till företaget Korroterm AB att fortsätta utveckla befintlig utrustning som tillämpar induktionsuppvärmning istället för att investera i en ny. Efter en undersökning av de detaljer som idag finns i produktionen framkom det gällande geometri, antal och frekvens att inga lämpliga detaljer fanns för denna utrustning. Det visade sig dock att det fanns en potential för tillämpning av induktionsuppvärmning för mindre detaljstorlekar. En studie för att undersöka möjligheterna att belägga dessa i nuvarande utrustning bör utföras.

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  • 69.
    Can, Kemal Caglar
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Postponement, Mass Customization, Modularization and Customer Order Decoupling Point: Building the Model of Relationships2008Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats
    Abstract [en]

    This paper focuses on four interrelated strategies: postponement, mass customization, modularization and customer order decoupling point. The goal of the postponement is to delay the customization as late as possible in the supply chain. It is also known as delayed differentiation. Mass customization is a relatively new term, which began to gain attention in the industry a decade ago. It was an obligatory invention as a response to the global market which becomes more turbulent day by day for the last two decades. Its goal is to produce customized products at low costs. Modularization is a common term that is used in many areas. In this study, we will focus on product architecture modularity and process modularity. Customer order decoupling point, which is also known as order penetration point, is used to distinguish the point in the supply chain where a particular product is associated to a specific order.

    Our target is building a model that explains how these four concepts are related. In order to achieve this, we will, first, research every concept individually; we will state the definitions, levels, benefits, enablers, success factors, drivers, etc. of the concepts. Then we will study the pair-wise relationships of these strategies. We will build our model according to the findings we have found in the literature. After building our model, we will explore it in Autoliv Electronics to see how it works in practice.

    Briefly, our model states the following:

    Modularization is an enabler of customization and it is necessary for the success of mass customization where set-up costs are critical. Product architecture modularity provides rapid assembly and cost efficiency that is required for postponement and mass customization. In addition, it is used to measure the mass customization degree according to some others.

    Postponement requires process modularity, and it moves the customer order decoupling point downstream in the value added material flow. It contributes the mass customization by increasing both the leanness and agility.

    Customer order decoupling point uses the customer requirements and existing capabilities of the mass customization for optimizing the flexibility-productivity balance.

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  • 70.
    Carlsson, Jenny
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Analys och åtgärdsförslag för ledtidsreducering vid fönstertillverkning2006Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats
    Abstract [sv]

    Detta examensarbete har utförts vid Elitfönster AB i Vetlanda. Elitfönster AB är Sveriges största leverantör av fönster och fönsterdörrar.

    Syftet med arbetet är att ta fram åtgärdsförslag för att minska ledtiderna, då korta leveranstider blir ett allt viktigare konkurrensmedel. Arbetet innebar en kartläggning av nuvarande produktionsflöde och identifiering av problemområden.

    Arbetet genomfördes med hjälp av tidsstudier och intervjuer med arbetsledare och personal. Arbetet bygger även en hel del på observationer, iakttagelser och studerande av statistik.

    I stora drag kan man dra slutsatsen att de långa ledtiderna beror på främst två orsaker;

    • hyvelbanornas långa ställtider som medför körningar i veckosatser

    • kvalitetsbrister och bristfälliga kvalitetskontroller samt trästycken som ”försvinner” längs förädlingskedjan. Detta leder till att order får ställas åt sidan i väntan på nya/omlackade bitar.

    För att erhålla en reducering av produktionsledtiden bör Elitfönster AB i första hand;

    • överväga att flytta ut ett eller två produktsortiment, vilket skulle medföra reducerade ställtider i hyvelbanorna och därmed en möjlighet att bryta ner veckosatserna i mindre satser.

    • sträva mot att synkronisera de olika resursernas cykeltider mot takttiden.

    • skapa stabila processer, det vill säga tillförlitlig utrustning och mångkunnig personal, för att kunna minimera buffertar och mellanlager.

    • kontinuerligt kvalitetsarbete i form av leverantörssamverkan och kvalitetsutbildningar till personal.

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  • 71.
    Carlsson, Stina
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Nordin, Anna
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Logistikens roll i industrialiserat byggande: en fallstudie av2008Självständigt arbete på grundnivå (yrkesexamen), 20 poäng / 30 hpStudentuppsats
    Abstract [sv]

    Krav på lägre produktionskostnader, kortare byggtider, felfria produkter och längre garantitider är ständigt aktuella i byggbranschen. Blickarna har de senaste åren vänts mot den traditionella industrin och möjligheterna att dra lärdomar från denna. Begreppet industrialiserat byggande har fötts och definieras i denna undersökning som förtillverkning av byggelement och komponenter i fabrik för vidare montering på byggarbetsplatsen. Det ses att detta sätt att bygga skulle kunna vara ett sätt att svara till de krav som ställs och i detta examensarbete undersöks hur logistik kan vara ett medel i att svara till dessa krav; hur logistik kan möjliggöra industrialiserat byggande. En fallstudie görs av ett företag som i denna undersökning benämns ”Trähus”, ett företag vars verksamhet består av industrialiserat byggande i trä och syftet med denna undersökning är att utreda hur, ur ett logistiskt perspektiv, ”Trähus” byggprocess kan effektiviseras.

    En del i problematiken kring industrialiserat byggande är att nå en balans mellan standardisering och flexibilitet. Standardisering för att uppnå en effektiv process och flexibilitet för att kunna svara till kunds krav. Med standardisering avses ett repetitivt utförande av något som fungerar bra vilket kan innefatta såväl standardiserade produkter som en standardisering på processnivå. Med en utgångspunkt i koordinationsteorier undersöks hur koordination, att hantera beroenden mellan aktiviteter, av material- och informationsflödet kan vara ett sätt att nå en mer standardiserad byggprocess och därigenom nå en sänkt totalkostnad. Ett grundkrav för att kunna koordinera är information; för att strategiskt styra en process måste det vara känt hur processen ser ut, vilka problem som finns, vad konsekvenserna av olika val blir etcetera. Här identifieras i denna undersökning ett problem i att det i stor utsträckning saknas just information vilket ger dåliga förutsättningar för att på ett bra sätt koordinera. Vidare är det just information som i stor utsträckning är problemet även i själva koordinationsarbetet.

    Bristande koordination ger slöserier i processen, med slöseri avses något som inte tillför något värde. Det kan exempelvis vara väntan eller felaktiga produkter. Genom att identifiera slöserier i processen kan bristande koordination kartläggas och slöserierna uppstår i många fall längre bak i processen och inte där de återfinns. Det konstateras i denna undersökning att bristande koordination i sig ökar kraven på ytterligare koordination då extra arbete som blir nödvändigt vid problem måste koordineras vilket kräver resurser och genererar kostnader.

    Denna undersökning resulterar i att ett flertal slöserier identifierats och vidare härleds till bristande koordination någonstans i byggprocessen. Förslag på hur koordinationen bör se ut för att reducera eller eliminera dessa slöserier presenteras för ett urval om tre beroenden. De första aktiviteterna i byggprocessen, försäljning, inköp och projektering, är av stor vikt för hur den fortsatta processen ser ut. Detta då alla andra aktiviteter direkt eller indirekt är beroende av försäljning, inköp och projektering. Utifrån detta väljs beroenden kopplade till dessa aktiviteter för vidare analys. Analysen visar att informationsutbytet mellan försäljning, inköp och projektering måste koordineras bättre genom viss standardisering av informationen samt av formerna för utbytet. Att det i dessa inledande aktiviteter i processen råder stor osäkerhet ger att det finns ett behov av möten och att det krävs rutiner kring dessa för att de ska fylla sitt syfte.

    Analysen visar också på behovet av en förbättrad koordination vad gäller lagermaterial. Här finns möjligeter att i större utsträckning koordinera försörjningen av lagermaterial genom olika regler och rutiner med ett elektroniskt stöd istället för genom personlig kommunikation.

    En generell slutsats i fallet ”Trähus” är att det är av högsta vikt att få en bättre kontroll på byggprocessen i form av en medvetenhet om vilka konsekvenser olika val får, vilka slöserier som finns, dess omfattning och vad de beror av. Denna typ av information är nödvändig för att nå en bra koordination och för att kontinuerligt kunna förbättra. En högre grad av standardisering av information och informationsutbyte, tydligare regler och rutiner kring möten och lagerstyrning är exempel på åtgärdsförslag som denna undersökning resulterar i och de bidrar till en högre grad av standardisering i byggprocessen då de syftar till att nå ett repetitivt utförande av något som fungerar bra. Ett första steg är alltså att exempelvis ta fram regler och rutiner för lagerstyrningen men sen är ett nödvändigt och kan tyckas självklart steg att följa dessa för att nå standardisering.

    Kvalitativ och kvantitativ data indikerar att slöserierna kan vara omfattande och ger vidare en ledning i att en förbättrad koordination kan ge ”Trähus” en högre grad av standardisering i byggprocessen och vidare en sänkning av totalkostnaden.

    En slutsats utifrån detta är att ”Trähus” byggprocess kan effektiviseras genom att applicera de koordinationsverktyg som presenteras i denna undersökning. ”Trähus” är ett byggföretag som ägnar sig åt industrialiserat byggande och genom att visa på hur man ur ett logistiskt perspektiv kan effektivisera ”Trähus” byggprocess har också frågan om hur logistik kan möjliggöra industrialiserat byggande besvarats.

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  • 72. Beställ onlineKöp publikationen >>
    Casper, Robert
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Automotive Remanufacturing in a Changing Market: Challenges and Opportunities in a market with a growing share of electric cars2021Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [sv]

    Denna doktorsavhandling ”Återtillverkning inom bilindustrin på en föränderlig marknad“ utforskar återtillverkning inom cirkulära värdekedjor. Återtillverkning kan beskrivas som en industriell process där använda produkter återförs till nyskick. I avhandlingen läggs vikt vid en av de största globala industrisektorerna, nämligen bilindustrin. Den utförda forskningen i denna avhandling syftar till att förstå dagens utmaningar inom denna industri och till att analysera vilka sorters utmaningar och möjligheter som följer av ett tekniskt skifte mot elektrifiering av fordon. Syftet uppnåddes genom att:

     

    • gå igenom tidigare forskningslitteratur om återtillverkning av bildelar samt om den senaste tekniken inom elbilar
    • utföra intervjuer och enkätstudier riktat mot experter från återtillverkningsindustrin för bildelar
    • beskriva och visualisera processteg för återtillverkning av olika bildelar

     

    I den första delen av avhandlingen beskrivs utmaningar som industrin står inför idag. Dessa är svårigheter vid anskaffning och insamling av använda bildelar, utmaningar i att identifiera och demontera delar, svårigheter att utföra de industriella processer som återför de använda delarna till nyskick, samt hinder vid hantering och återtillverkning av de delar som inte kan återanvändas på ett ekonomiskt och miljömässigt gynnsamt sätt.

    I den andra delen behandlas ämnen som följer av de senaste trenderna inom det tekniska skiftet mot elbilar. Exempelvis betyder detta att nya produkter (såsom elmotorer, batteripaket), nya marknadsaktörer (såsom Tesla) och olika återtillverkningsprocesser (såsom återtillverkning av batteripaket) kan leda till såväl nya möjligheter som risker. Det kan ge potential för nya affärsidéer, men samtidigt kräva kapitalintensiva investeringar inom fackkunskap (t.ex. utbildning, specifikationer och personal), tillverkningsmaskiner, och hantering av nya former av avfall (såsom farligt avfall från batteripaket).

    Slutligen, baserat på utvärdering av nuvarande och framtida möjligheter och utmaningar, tas rekommendationer fram riktat mot hur industrin kan agera i pågående teknikskiftet mot elbilar.  

    Delarbeten
    1. Addressing Today’s challenges in automotive remanufacturing
    Öppna denna publikation i ny flik eller fönster >>Addressing Today’s challenges in automotive remanufacturing
    2018 (Engelska)Ingår i: Journal of Remanufacturing, ISSN 2210-4690, Vol. 8, s. 93-102Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Automotive remanufacturing companies are nowadays facing a wide range ofchallenges. Typical challenges from the point of view of suppliers, producers and customers.Several process steps are analysed and problem fields are dissected: From the core management,to disassembly and cleaning to machining and testing. The main fields of challengesanalysed in this paper are: the vagueness in respect of fiscal value, environmental regulationsand taxation of core parts, the important need for a continuing qualification of staff andengineers, an efficient core management, the adaption of pricing models and the competence tohandle the growing variety and complexity. The focus of this analysis lies on activities of theindependent after-market (IAM) for remanufactured products.

    Ort, förlag, år, upplaga, sidor
    Springer Netherlands, 2018
    Nyckelord
    Remanufacturing, Automotive, Mechatronics, Electronics, Design for Remanufacturing, Core management, Circular economy
    Nationell ämneskategori
    Farkostteknik
    Identifikatorer
    urn:nbn:se:liu:diva-150064 (URN)10.1007/s13243-018-0047-9 (DOI)
    Tillgänglig från: 2018-08-09 Skapad: 2018-08-09 Senast uppdaterad: 2021-11-10
    2. Reverse Logistic Transportation and Packaging Concepts in Automotive Remanufacturing
    Öppna denna publikation i ny flik eller fönster >>Reverse Logistic Transportation and Packaging Concepts in Automotive Remanufacturing
    2018 (Engelska)Ingår i: Procedia Manufacturing, E-ISSN 2351-9789, Vol. 25, s. 154-160Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    A key process in a closed-loop supply chain is managing and challenging the transportation and packaging management. Strict environmental regulations in connection with transport of environmentally hazardous substances (e.g. oil) are offering a highcost-saving potential in connection with an optimised transportation and packaging concept. The aim of this case orientated paperis to provide the framework for the management of reverse flow of materials in automotive industry. The emphasis is placed onthe remanufacturing activities. To obtain and verify the necessary information for the above mentioned problems, differentmethods and techniques have been applied: 1) Relevant, available literature in connection with this matter was studied; 2) Dataand documents was requested directly by relevant market actors; 3) The clustered data was analysed and samples werehighlighted; and 4) The data was evaluated and recommended courses of action were given. The results show that the mainproblems appear in the area of forward and reverse logistics: Packaging concepts which do not protect the product in an optimalway (forward / reverse logistics). Moreover, packaging concepts which do not protect the environment against potential negativeinfluence of a used part (reverse logistics) A best practice for the transportation of engine components is given and evaluated: Anengine in a metal frame with oil-pan. Securely attached by bolts. Packed in plastic bag.

    Ort, förlag, år, upplaga, sidor
    Elsevier, 2018
    Nyckelord
    Reverse logistics, remanufacturing, closed loop supply chain, transportation systems
    Nationell ämneskategori
    Farkostteknik
    Identifikatorer
    urn:nbn:se:liu:diva-150063 (URN)10.1016/j.promfg.2018.06.069 (DOI)000547903500020 ()
    Tillgänglig från: 2018-08-09 Skapad: 2018-08-09 Senast uppdaterad: 2022-05-16
    3. Electrification in the automotive industry: effects in remanufacturing
    Öppna denna publikation i ny flik eller fönster >>Electrification in the automotive industry: effects in remanufacturing
    2021 (Engelska)Ingår i: Journal of Remanufacturing, ISSN 2210-4690, Vol. 11, nr 2, s. 121-136Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    The automotive market is changing. For many years, cars with internal-combustion engines were dominant. Recently, more cars with alternative drive trains have become available, and their market share has increased, a trend that has had an effect on the remanufacturing industry for automotive parts. This paper aims to describe and evaluate the challenges and opportunities in the coming years for the remanufacturing industry as a result of the increasing number and share of electric vehicles. Both theory and empirical data have been used to meet this aim. From theory, the two different drive train concepts of the internal combustion engine and the battery electric vehicle are described, along with the major differences from a remanufacturing standpoint. These differences and effects are described, evaluated, and fully or partly confirmed by industry experts. The results show that future market actors are unset today, less space-consuming machinery parks will be needed, major investments into knowledge and equipment (especially for testing) will be required, and the necessity to handle different kinds of end-of-use/life solutions, especially the recovery for the electric vehicle battery packs, will be a challenge. As future development is still uncertain, the authors recommend that market actors investigate the challenges and opportunities highlighted in this paper and watch future developments carefully.

    Nationell ämneskategori
    Farkostteknik
    Identifikatorer
    urn:nbn:se:liu:diva-180946 (URN)10.1007/s13243-020-00094-8 (DOI)2-s2.0-85096157889 (Scopus ID)
    Anmärkning

    Funding agencies: Open access funding provided by Linköping University. Additional acknowledgement goes to the financing of this research from the “CarE-Service” project, which has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 776851 and the “SE:Kond 2 LIFE” project (2019-04463), funded by the Swedish Governmental Agency.

    Tillgänglig från: 2021-11-10 Skapad: 2021-11-10 Senast uppdaterad: 2021-11-19Bibliografiskt granskad
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  • 73.
    Cederborg, Ola
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Produktionsekonomi. Linköpings universitet, Tekniska högskolan.
    Rudberg, Martin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Produktionsekonomi. Linköpings universitet, Tekniska högskolan.
    Advanced Planning Systems: Master Planning in the Process Industry2008Ingår i: Proceedings of the 15th EurOMA Conference, 2008, 2008Konferensbidrag (Övrigt vetenskapligt)
  • 74.
    Cederborg, Ola
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Produktionsekonomi. Linköpings universitet, Tekniska högskolan.
    Rudberg, Martin
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska högskolan.
    Customer Segmentation and Capable-to-promise in a Capacity Constrained Manufacturing Environmen2009Ingår i: Proceedings of the 16th EurOMA Conference, 2009, 2009Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The purpose of this study is to analyse customer segmentation and capable-to-promise functionality in a demand fulfilment process. This is done through a literature review and a case study, the case showing that the company has experienced good results from using an advanced planning system based on customer segmentation and capable-to-promise functionality.

  • 75.
    Chari, Arpita
    et al.
    Chalmers University of Technology, Division of Production Systems, Department of Industrial and Material Science.
    Vogt Duberg, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Lindahl, Emma
    Royal Institute of Technology, Department of Sustainable Production Development.
    Stahre, Johan
    Chalmers University of Technology, Division of Production Systems, Department of Industrial and Material Science.
    Despeisse, Mélanie
    Chalmers University of Technology, Division of Production Systems, Department of Industrial and Material Science.
    Sundin, Erik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Johansson, Björn
    Chalmers University of Technology, Division of Production Systems, Department of Industrial and Material Science.
    Wiktorsson, Magnus
    Royal Institute of Technology, Department of Sustainable Production Development.
    Swedish Manufacturing Practices Towards a Sustainability Transition in Industry 4.0: A Resilience Perspective2021Ingår i: Proceedings of the Asme 2021 16th International Manufacturing Science and Engineering Conference (MSEC2021), Vol 1, AMER SOC MECHANICAL ENGINEERS , 2021, artikel-id V001T04A002Konferensbidrag (Refereegranskat)
    Abstract [en]

    The Swedish strategic innovation programme, Produktion2030, is a national long-term effort towards global industrial competitiveness addressing Swedish industry’s transition towards climate goals of the European Green Deal while simultaneously realising smart manufacturing and Industry 4.0 (I4.0). This paper investigated the extent of sustainability implementation and implications of I4.0 technologies through a nation-wide quantitative survey in Produktion2030’s 113 collaborative research projects. The analysis showed that 71% of the assessed projects included environmental aspects, 60% social aspects, and 45% Circular Economy (CE) aspects. Further, 65% of the projects implemented I4.0 technologies to increase overall sustainability. The survey results were compared with literature to understand how I4.0 opportunities helped derive sustainability and CE benefits. This detailed mapping of the results along with eight semi-structured interviews revealed that a majority of the projects implemented I4.0 technologies to improve resource efficiency, reduce waste in operations and incorporate CE practices in business models. The results also showed that Swedish manufacturing is progressing in the right direction of sustainability transition by deriving key resilience capabilities from I4.0-based enablers. Industries should actively adopt these capabilities to address the increasingly challenging and unpredictable sustainability issues arising in the world and for a successful transition towards sustainable manufacturing in a digital future.

  • 76.
    Chari, Arpita
    et al.
    Chalmers University of Technology, Division of Production Systems, Department of Industrial and Material Science, Gothenburg, Sweden.
    Vogt Duberg, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Lindahl, Emma
    KTH, School of Industrial Engineering and Management (ITM), Sustainable production development, Stockholm, Sweden.
    William-Olsson, Patrik
    RISE, Sweden.
    Sundin, Erik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Wiktorsson, Magnus
    KTH, School of Industrial Engineering and Management (ITM), Sustainable production development, Stockholm, Sweden.
    Johansson, Björn
    Chalmers University of Technology, Division of Production Systems, Department of Industrial and Material Science, Gothenburg, Sweden.
    Stahre, Johan
    Chalmers University of Technology, Division of Production Systems, Department of Industrial and Material Science, Gothenburg, Sweden.
    Warrol, Cecilia
    Teknikföretagen, Sweden.
    Sustainability in Produktion2030: Sustainability and circular economy actions within the project portfolio of the Produktion2030 strategic innovation programme2021Rapport (Övrigt vetenskapligt)
    Abstract [en]

    Global manufacturing industry is undergoing tremendous transformation towards increased sustainability. This vital, industrial sector is rapidly enhancing its capability for resource efficient, circular, and climate neutral processes and business models. Industry is also rapidly recognizing sustainability and resilience measures as competitive advantages and unique selling points. Companies are being both nudged and forced into sustainable, resource-efficient businesses to comply with new demands and regulations from for example the European Commission’s Green Deal and global policy like the United Nations' Sustainable Development Goals (SDGs).

    Customer needs as well as government policies and regulations are enforced through e.g. economic bonus and penalty systems, accelerating transformation. This change process is complex, requiring new knowledge and innovation. Therefore, Industrial sustainability is at the core of Produktion2030, the national Swedish Strategic Innovation Programme for manufacturing industry.

    The vision of Produktion2030 is to enable a competitive and sustainable Swedish manufacturing industry. Produktion2030 is putting strong efforts into acceleration of the green transformation, creating crossdisciplinary and multi-stakeholder collaboration, increasing national innovation capacity and agility, and driving competence development as well as workforce upskilling. In 2020, the Produktion2030 Programme Office and Supervisory Group commissioned a study to map sustainability achievements within the programme's total product portfolio.

    A national group of sustainability experts from Chalmers University of Technology, Linköping University, Royal Institute of Technology, and the institute RISE were invited to analyse all past and present Produktion2030 projects, from sustainability and circular economy perspectives.

    This report presents the results from the study, highlighting a selection of contributions to industrial sustainability achieved by Produktion2030 during the programme’s first six years. Data for the study was gathered during the spring of 2020. Representatives from all ongoing and finalised projects within the Produktion2030 programme were invited to an online survey. The objective was to investigate specific project impacts in terms of sustainability and implementation of a circular economy.

    Results showed that all Produktion2030 projects had applied at least one dimension of sustainability, economic. Further, 71% of the projects also covered the environmental dimension. Several projects applied sustainability trade-offs, where an improvement within one sustainability dimension affected other dimensions negatively. The UN Sustainable Development Goals #8, #9 and #12, were considered most relevant by the projects. Implementation or inclusion of circular economy was also common (45%) among the projects. Projects adapted circular economy concepts differently, according to their self-defined project scope and system boundaries. Finally, 65 % of the projects implemented Industry 4.0 concepts and digital solutions, to increase and accelerate the sustainability impact. In conclusion, the study of sustainability efforts within the complete portfolio of Produktion2030 projects by 2020 showed that the programme is strongly contributing to the transformation of manufacturing industry in Sweden towards sustainability.

    Produktion2030 has a deep, strategic commitment to address the challenges of the UN Sustainable Development Goals. This study shows that Produktion2030 also has an excellent transformational capability to deliver research, innovation, and education results that influences sustainability factors. The results strongly support the manufacturing community in Sweden, allowing industry, academia, and institutes to act towards a more sustainable, resilient, and circular society.

  • 77.
    Chen, Fang
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Industriell arbetsvetenskap. Linköpings universitet, Tekniska högskolan.
    Thermal Responses of the Hand to Convective and Contact Cold: with and without Gloves1997Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Many outdoor working tasks and some indoor working tasks still require the worker to perform them in a cold condition. To cope with cold condition, warm clothing is usually applied. Nowadays, the thermal protection of clothing is sufficient but the extremities are still not very well protected. It is very difficult to provide sufficient thermal protection to the hand, that does not decrease the hand performance. In the literature review of this thesis, the most important factors and topics related to the cooling of the hand and fingers are summarized.

    The issue of cold contact is still not sufficiently studies. How fast the skin may cool down to a dangerous level and how many factors may influence the contact cooling was not clear. There are five empirical studies concerned with cold surface contact by bare and gloved hand which are summarized in the thesis. The experimental studies of contact cooling of the bare finger and gloved finger were carried out in a small climate chamber. Many factors which may possibly influence the contact cooling were considered. These factors include: contact force; surface temperature; material property; surface mass; the thermal situation of the whole body and the morphology of the fingers.

    For the technical determination of the thermal resistance of the gloves, a mini hot plate was developed according to the EN 511 (36) and ISO 5085 (72) standards. The error from doubledetermination was less than 4%.

    The skin temperature (Tsk) was the dependent measurement for all of the studies. It varied on the different points of the hand. The measurement points and the location for measuring the Tsk is critical. Tsk and cold induced-vasodilatation showed a very local phenomenon. For unequal cooling (such as contact), the contact Tsk is critical and needs to be considered separately.

    The results indicated, that a modified Newtonian cooling curve with two time constants provided the best regression function for the contact Tsk of bare hand contact on cold surfaces and it may also be possible to describe the contact Tsk of a gloved hand.

  • 78.
    Chen, Jian
    et al.
    Nanjing Univ Aeronaut & Astronaut, Peoples R China.
    Ning, Tong
    Nanjing Univ Aeronaut & Astronaut, Peoples R China.
    Xu, Gangyan
    Hong Kong Polytech Univ, Peoples R China.
    Liu, Yang
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten. Univ Vaasa, Finland.
    A memetic algorithm for energy-efficient scheduling of integrated production and shipping2022Ingår i: International journal of computer integrated manufacturing (Print), ISSN 0951-192X, E-ISSN 1362-3052, Vol. 35, nr 10-11, s. 1246-1268Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Energy-efficient manufacturing is critical as the industrial sector accounts for a substantial portion of global energy consumption. This research aims to address an energy-efficient scheduling problem of production and shipping for minimizing both makespan and energy consumption. It contributes to an integrated energy-efficient production and shipping system, which is separately studied in most existing research. The production stage allocates jobs onto unrelated parallel machines that can be shut off and adjust their cutting speed to save energy. The shipping stage aims to allocate jobs to vehicles of various sizes with varied unit energy consumption. The problem is modelled as a mixed-integer quadratic program. Considering its complexity, a memetic algorithm (MA) is proposed to incorporate a knowledge-driven local search strategy considering the balance between exploration and exploitation. Two dominance rules are derived from the characteristics of the specific problem and embedded into the proposed MA to enhance its performance. Experimental results demonstrate that the proposed MA outperforms two other population-based algorithms, genetic algorithm and traditional MA, in terms of performance and computing time. This research practically contributes to improving productivity and energy efficiency for the production-shipping supply chain of make-to-order products.

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  • 79.
    Cheng, Yang
    et al.
    Aalborg Univ, Denmark; Jiangxi Univ Finance & Econ, Peoples R China.
    Fredriksson, Anna
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Fleury, Afonso
    Univ Sao Paulo, Brazil.
    Guest editorial - Rethinking international manufacturing in times of global turbulence2021Ingår i: Journal of Manufacturing Technology Management, ISSN 1741-038X, E-ISSN 1758-7786, Vol. 32, nr 6, s. 1113-1120Artikel i tidskrift (Övrigt vetenskapligt)
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    fulltext
  • 80.
    Chicksand, Daniel
    et al.
    Warwick Business School.
    Kumar, Naveen
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Logistik. Linköpings universitet, Tekniska högskolan.
    Rehme, Jakob
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell marknadsföring och industriell ekonomi. Linköpings universitet, Tekniska högskolan.
    Walker, Helen
    Cardiff Business School.
    Global Purchasing – Implications for Purchasing and Logistics: A research synthesis2011Konferensbidrag (Refereegranskat)
    Abstract [en]

    Globalisation and the dynamics of the new economic geography is increasingly influencing supply chain management across different industries. Although the literature combining purchasing and logistics in the global supply chain is crucial, it has scarcely been reviewed in this combined approach. With companies like DELL, Walmart, and Li & Fung who are orchestrators in supply chains capitalising upon globalisation, the future trend is for a greater need to understand the purchasing and logistics aspects of global supply chains. In this study a review, analysis and synthesis of the literature in purchasing and logistics in global purchasing is conducted to. The research synthesis will aid both practitioners and researchers in a broader and better understanding of purchasing and logistics issues in the context of global supply chain design.

  • 81.
    Dahlström, Nicklas
    et al.
    Lund University School of Aviation, Ljungbyhed, Sweden/Swedish Defence Research Agency, Linköping, Sweden.
    Magnusson Nählinder, Staffan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Tekniska högskolan.
    A Comparison of Two Recorders for Obtaining In-flight Heart Rate Data2006Ingår i: Applied Psychophysiology and Biofeedback, ISSN 1090-0586, E-ISSN 1573-3270, Vol. 31, nr 3, s. 273-279Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Measurement of mental workload has been widely used for evaluation of aircraft design, mission analysis and assessment of pilot performance during flight operations. Heart rate is the psychophysiological measure that has been most frequently used for this purpose. The risk of interference with flight safety and pilot performance, as well as the generally constrained access to flights, make it difficult for researchers to collect in-flight heart rate data. Thus, this study was carried out to investigate whether small, non-intrusive sports recorders can be used for in-flight data collection for research purposes. Data was collected from real and simulated flights with student pilots using the Polar Team System sports recorder and the Vitaport II, a clinical and research recording device. Comparison of the data shows that in-flight heart rate data from the smaller and less intrusive sports recorder have a correlation of.981 with that from the clinical recorder, thus indicating that the sports recorder is reliable and cost-effective for obtaining heart rate data for many research situations.

  • 82.
    Dahlström, Nicklas
    et al.
    Lund University School of Aviation, Ljungbyhed, Sweden.
    Magnusson Nählinder, Staffan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Tekniska högskolan. Swedish Defence Research Agency , Linköping, Sweden.
    Mental Workload in Aircraft and Simulator during Basic Civil Aviation Training2009Ingår i: The International journal of aviation psychology, ISSN 1050-8414, E-ISSN 1532-7108, Vol. 19, nr 4, s. 309-325Artikel i tidskrift (Övrigt vetenskapligt)
    Abstract [en]

    This study investigated mental workload in basic civil aviation training. Heart rate, eye movement and subjective ratings from eleven students were collected during simulator and aircraft sessions. Results show high correspondence in psychophysiological reactions between the sessions. For some flight segments heart rate was consistently lower in the simulator, suggesting higher mental workload in the aircraft. Differences in heart rate during rejected take-off and engine failure indicate that the increase of workload starts in advance of an “unexpected“ event in the simulator and seem to be of preparatory nature, while more connected to management of the situation in the aircraft. Descriptors: psychophysiology, mental workload, aviation training, flight simulation, learning transfer

  • 83.
    Dahlström, Nicklas
    et al.
    Lund University School of Aviation, Ljungbyhed, Sweden.
    Magnusson Nählinder, Staffan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Tekniska högskolan. Swedish Defence Research Agency , Stockholm, Sweden.
    Wilson, Glenn F.
    Air Force Research Laboratory , Wright-Patterson Air Force Base , Ohio, USA.
    Svensson, Erland
    Swedish Defence Research Agency , Stockholm, Sweden.
    Recording of Psychophysiological Data during Aerobatic Training2011Ingår i: The International journal of aviation psychology, ISSN 1050-8414, E-ISSN 1532-7108, Vol. 21, nr 2, s. 105-122Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Measuring pilot mental workload can be important for understanding cognitive demands during flight involving unusual movements and attitudes. Heart rate, eye movements, EEG and subjective ratings from seven flight instructors was collected for a flight including a repeated aerobatics sequence. Heart rate data and subjective ratings showed that aerobatic sequences produced the highest levels of mental workload and that heart rate can identify low-G flight segments with high mental workload. Blink rate and eye movement data did not support previous research regarding their relation to mental workload. EEG data was difficult to analyze due to muscle artifacts.

  • 84.
    Dang Vu, Mattias
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Produktionsekonomi.
    Arouk, Sabah
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Produktionsekonomi.
    Improvement and Standardization of Forklift Remanufacturing: Action Research on Toyota Material Handling Sweden forklift remanufacturing2023Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The current production field operates on linear resource flows, characterized by known supply and consistent manufacturing materials. In contrast, a remanufacturing system experiences variable process flows for each produced unit, even though the end product remains the same. The uncertainty surrounding the quality of cores can impact tactical decisions. This variability is influenced by factors such as the quality and condition of the core upon arrival at the facility, leading to uncertainties in cost and production times.

    The purpose of this research is to develop a cost estimation method for product recovery decision-making processes and enhance the flow efficiency of remanufacturing processes. To achieve this goal, the study identifies and investigates the factors that affect the condition of the core, represented by processing time. Subsequently, the analysis focuses on processing time and spare parts cost, and introduces a cost estimation method based on historical data. Finally, the current process flow is examined, and suggestions for improvements are provided.

    This research employs two distinct approaches: statistical and quantitative analysis, as well as qualitative inquiry that considers the experiences and perceptions of employees and other non-numerical aspects. Therefore, an action research methodology has been used, combining scientific knowledge with existing expertise within an organization to address real organizational problems.

    The study develops a new inspection process that combines a prediction model for processing times with a thorough inspection of important parts identified through spare part analysis. Additionally, suggestions are made to improve the flow of the remanufacturing process by prioritizing critical inventory items and introducing a new inspection and cleaning station where necessary spare parts are ordered before the remanufacturing process begins.

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  • 85.
    Danielsson, Per-Erik
    Linköpings universitet, Institutionen för systemteknik. Linköpings universitet, Tekniska högskolan.
    Implementations of the Convolution Operation1982Rapport (Övrigt vetenskapligt)
    Abstract [en]

    The first part of this article surveys a large number of implementations of the convolution operation (which is also known as the sum-of-products, the inner product) based on a systematic exploration of index permutations. First we assume a limited amount of parallelism in the form of an adder. Next, multipliers and RAM:s are utilized. The so called distributed arithmetic follows naturally from this approach.

    The second part brings in the concept of pipelining on the bitlevel to obtain high throughput convolvers adapted for VLSI-design (systolic arrays). The serial/parallel multiplier is analyzed in a way that unravels a vast amount new variations. Even more interesting, all these new variations can be carried over to serial/parallel convolvers. These novel devices can be implemented as linear structures of identical cells where the multipliers are embedded at equidistant intervals.

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    Implementations of the Convolution Operation
  • 86.
    Danilovic, Mike
    Linköpings universitet, Ekonomiska institutionen. Linköpings universitet, Tekniska högskolan.
    Loop: Leadership and Organization of Integration in Product Development1999Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Many companies have introduced concurrent engineering over the years in product development to handle the complexity of the technology chosen, relations and dependencies through coordination of people and the integration of tasks in problem solving.

    The aim of this research is to investigate the collaboration of engineers and management, and how tasks are composed in order to enable high levels of integration in cross-functional settings in product development.

    The context of this research is the product development of the Swedish multi-role aircraft, JAS39 Gripen at Saab. The product development of aircraft is based on advanced technology on the edge of present knowledge, pushing the limits of present knowledge and developing new technologies.

    While product development as a process is equifinal, the introduction of concurrent engineering is a multifinal process. There is not one answer to how concurrent engineering set-ups should be designed. Even if the aim and mission may appear to be the same, the actual outcome of a design process of a particular concurrent engineering setting may be different.

    In Loop, a framework of the architecture of integration is developed that enable an analysis of different concurrent engineering settings. The most important reasons for the lack of intra- and inter-organizational integration of suppliers in the product development are the design of the work breakdown structure and the definition of work packages. Dependence structure matrix methodology is introduced to elaborate the established work breakdown structure and work packages, enabling engineers and suppliers to participate in the design of the process for product development on the engineering work level. In addition, dependency structure analysis shows that collaborative work packages, and multi-layer team structure, could be applied in order to handle the coordination of people and integration of tasks among functions, suppliers, and systems integrators.

    The answer to handling complexity is to develop organizational settings on the principles of selforganizing systems. A human system based on the principles of self-organizing is characterized by bounded instability. A self-organizing system is an adaptive, nonlinear system with open boundaries, continuously redesigned. A self-organizing system is a fractal structure. Every self-organizing system, or its part, is unique and differs from all the others. The process of establishing the "self' is not directed or controlled by management, but evolves through the interrelationships of the system's parts, elements, processes, and people. Self-organizing system develop through the participation of engineers in the design of the structure and the processes. The performance of the self-organizing system is attained through the coherence and collaboration of all people, and their participation and commitment in the design of the self-organizing system. The participatory approach is based on the premises of situational visibility that appear when strategic conversation takes place at the same time as engineers participate in organizational and process design. The participation of engineers is based on respect for their autonomy, identity, and privacy. Strategic conversation and participation are crucial for developing self-organizing and selfregulating systems.

  • 87. Beställ onlineKöp publikationen >>
    de Paula, Andes
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell marknadsföring och industriell ekonomi. Linköpings universitet, Tekniska högskolan.
    Dynamics of corporate strategy from a value chain perspective: A study of the Swedish telecom and construction industries during the 90’s2006Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Changes in sectors and industries have brought new challenges to corporations as well as been important driving forces for the dynamics in strategy at the corporate level. With the dramatic developments of the 1990’s in mind, such as multilateral free-trade agreements, liberalization, privatization, sharp industry growth/decline, increased competition and globalization, in particular within the telecom and the construction industry, this study contributes to describing and understanding strategic change at the corporate level as well as changes in the division of work within value chains. Strategy is defined as intentions, decisions and actions that relate to bundling and unbundling at different strategic levels, aiming to establish and reestablish a value chain position. Thus, outsourcing, M&As, modularization and systems development and sales are important strategic components which are examined from a value chain perspective. From a value chain perspective, the purpose of this study is to describe and understand strategic change at the corporate level in the telecom and construction industries during the 1990’s. More specifically this study shall contribute to describing and understanding (i) the dynamics of and between M&As, outsourcing, modularization and systemization, as well as (ii) industrial and financial drivers to strategic change.

    The conclusions describe strategic change from a value chain perspective using three descriptive patterns, including an increasing degree of specialization and need for interorganizational coordination across the value chain. In addition, outsourcing and modularization of systems and an increased scope of offering through systemization and BOT-projects, result in the fact that due to M&As the horizontal boundary of the firm sometimes goes beyond the industry scope while the vertical scope is often narrowed through outsourcing. The conclusions also focus on understanding the content of strategic change, that is to say the dynamics of and between mergers and acquisitions, outsourcing, modularization and system sales. These findings are summarized in nine explanatory patterns. These patterns show that the strategic decisions of bundling and unbundling at the corporate and functional level through mergers and acquisitions, outsourcing, systemization and modularization are guided by an industrial as well as a financial logic. By considering the descriptive and explanatory patterns found this study, the conclusions also include what to expect during the next decade with regard to corporate strategy from a value chain perspective in five predictive patterns.

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  • 88.
    Diffner, Björn
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Monteringsteknik.
    Edlund, Erik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Monteringsteknik.
    Utvärdering av 3dvia Composer: -För arbetsinstruktioner och beredning2009Självständigt arbete på avancerad nivå (masterexamen), 30 poäng / 45 hpStudentuppsats
    Abstract [sv]

    I takt med den tekniska utvecklingen har datorstödd konstruktion och produktion blivit en alltviktigare del i produktlivscykeln. Nya affärsområden såsom funktionsförsäljning ochåtertillverkning där tillverkande företag har tagit på sig ett allt större ansvar för helaproduktlivscykeln har växt fram på senare tid. Detta ställer allt högre krav på att ha kontrollöver produktdata under hela produktlivscykeln. Datorstödd konstruktion är sedan länge utbrettoch etablerat inom industrin och på senare år har även digital manufacturing , med i vilketPapperslös produktion är en del fått en allt större betydelse. Papperslös produktion innebär attalla order och arbetsinstruktioner visas t.ex. på en skärm istället för i pappersform. För atthjälpa företag att bereda bättre arbetsinstruktioner har Dassault Systémes lanserat produkten3Dvia Composer.Företaget DELFOi arbetar med digital manufacturing på den nordiska marknaden och äråterförsäljare av Dassault Systémes produkter. DELFOi önskar veta om 3Dvia Composer ären produkt som tillför produktportföljen något och vilka vinster den kan ge deras kunder. Detär även viktigt att företaget har en modell som kan användas för att marknadsföra ochimplementera Composer framgångsrikt hos kund.För att utreda detta intervjuades fem företag som bereder instruktioner för olika delar avproduktlivscykeln. Deras arbetssätt kring arbetsinstruktioner kartlades, samt behov och bristeri arbetssätt identifierades. Teorier för människa/maskin-gränssnitt och elektroniskaarbetsinstruktioner studerades. Utifrån dessa teorier och resultatet från intervjuernautvärderades sedan 3Dvia Composers kompetens för framtagning av arbetsinstruktioner.Programvaran jämfördes också med konkurrerande program i en benchmarking. Slutligenarbetades metodik och dokument fram för hur DELFOi kan implementera 3Dvia Composerhos kund.Detta arbete visar att interaktiva arbetsinstruktioner har många fördelar och kan lösa många avde problem som företag idag identifierar relaterat till beredning av arbetsinstruktioner och3Dvia Composer är en kompetent programvara för att uppnå detta. Det kommer dock attkrävas stora arbetsresurser för att sälja 3Dvia Composer, eftersom de flesta företag, trots enrad uttalade problem, är nöjda med dagens arbetsmetodik och därför har svårt att söka nyalösningar på problemen.

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  • 89.
    Doktorian, Paul
    et al.
    Linköpings universitet, Tekniska högskolan, Filosofiska fakulteten, Institutionen för ekonomisk och industriell utveckling.
    Tuvesson, Fredrik
    Linköpings universitet, Tekniska högskolan, Filosofiska fakulteten, Institutionen för ekonomisk och industriell utveckling.
    DFM för Lasersvetsning2008Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats
    Abstract [en]

     

    The purpose with this thesis was to develop a designguideline which will simplify the development of new products that will be laser welded. The need for this thesis has come forward from the quality problems that Volvo Construction Equipment, Components Division is having with their laser welding manufacturing unit. The reason for the problems emerges from the bad communication between the development unit and the manufacturing unit within the company when the products produced today was developed. This resulted in products that were hard to and in some cases almost impossible to weld.

     

    To avoid these problems from occurring again it was needed to gather the experiences within this area and compile it and present in a brief a pedagogical manner. The information for the groundwork of our results has been gathered by interviews of several key persons in Volvo Construction Equipment, Components Division. Other information channels have been a literary study, visiting other companies, participating in the manufacturing processes and participation in the project for non-destructive testing.

     

     

    We have considered the following subjects after compiling the gathered information:

     

    ·         Product design

    ·         Choice of material

    ·         Weld joint design

    ·         The limiting dimensions of the laser welding unit

    ·         The Heat Affected Zone, HAZ, after laser welding

    ·         Washing/Cleanliness

    ·         Testing – Destructive or non-destructive

     

     

    There is no other company in the world that welds products with the same method and the same material as they do in Volvo Construction Equipment, Components Division. The conclusion is that the complications that arose when the products that are manufactured today were developed can be avoided if our designguideline were to be followed in the future new development.

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  • 90.
    Domeij Bäckryd, Rebecka
    et al.
    Linköpings universitet, Tekniska fakulteten. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Mekanik och hållfasthetslära.
    Ryberg, Ann-Britt
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Mekanik och hållfasthetslära. Linköpings universitet, Tekniska fakulteten. Combitech AB, Trollhättan, Sweden.
    Nilsson, Larsgunnar
    Linköpings universitet, Tekniska fakulteten. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Mekanik och hållfasthetslära.
    Multidisciplinary design optimisation methods for automotive structures2017Ingår i: International Journal of Automotive and Mechanical Engineering, ISSN 2229-8649, Vol. 14, nr 1, s. 4050-4067Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Multidisciplinary design optimisation (MDO) can be used as an effective tool to improve the design of automotive structures. Large-scale MDO problems typically involve several groups who must work concurrently and autonomously in order to make the solution process efficient. In this article, the formulations of existing MDO methods are compared and their suitability is assessed in relation to the characteristics of automotive structural applications. Both multi-level and single-level optimisation methods are considered. Multi-level optimisation methods distribute the design process but are complex. When optimising automotive structures, metamodels are often required to relieve the computational burden of detailed simulation models. The metamodels can be created by individual groups prior to the optimisation process, and thus offer a way of distributing work. Therefore, it is concluded that a single-level method in combination with meta-models is the most straightforward way of implementing MDO into the development of automotive structures. If the benefits of multi-level optimisation methods, in a special case, are considered to compensate for their drawbacks, analytical target cascading has a number of advantages over collaborative optimisation, but both methods are possible choices.

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    Multidisciplinary design optimisation methods for automotive structures
  • 91.
    Dunbäck, Otto
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Monteringsteknik. Linköpings universitet, Tekniska högskolan.
    Sundin, Erik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Monteringsteknik. Linköpings universitet, Tekniska högskolan.
    Reverse logistic challenges within the remanufacturing of automotive components2011Ingår i: Proceedings of 1st International Conference on Remanufacturing: July 26-29, Glasgow, UK, 2011, s. 74-82Konferensbidrag (Refereegranskat)
    Abstract [en]

    The remanufacturing industry as a whole, and the automotive sector in particular, have over the years proven to be beneficial to the environment and economically lucrative to the companies involved as well as to their customers. However, the different processes within remanufacturing are associated with complicating characteristics, not least to mention the process of core acquisition, which is not present in traditional manufacturing.

    This paper presents a qualitative study based on interviews from six SMEs regarding challenges linked to the reverse logistics of SMEs remanufacturing and trading automotive components, acting as a first attempt to identify the specific challenges concerning the collection phase of automotive mechatronics and electronics remanufacturing. Challenges previously identified by researchers are confirmed, additional challenges within the collection phase are recognized and challenges expected to arise when remanufacturing and trading automotive CAN bus components are identified and discussed. The major concern for the involved companies when auspicating future challenges is the handling, transportation and storing of cores. Even though the cores today mainly consist of mechanical components, these challenges are still present; they are expected, however, to become even more crucial when cores contain electronic components.

  • 92.
    Edh Mirzaei, Nina
    et al.
    Chalmers University of Technology, Gothenburg, Sweden.
    Fredriksson, Anna
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Winroth, Mats
    Chalmers University of Technology, Gothenburg, Sweden.
    Strategic consensus on manufacturing strategy content: including the operators' perceptions2016Ingår i: International Journal of Operations & Production Management, ISSN 0144-3577, E-ISSN 1758-6593, Vol. 36, nr 4, s. 429-466Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Purpose – Strategic consensus between operators and managers is an important means to accomplish a successful manufacturing strategy (MS) process. Previous studies largely left out individual operators from this concept. Therefore, the purpose of this paper was to empirically examine the level of strategic consensus on the MS within the operations function, that is, the operators’ and managers’ perceptions of MS.

    Design/methodology/approach – Interviews were conducted with both operators and managers at three small and medium-sized enterprises in Sweden. The MS dimensions were selected based on previous research; the data was analysed by using thematic coding.

    Findings – The study shows that the levels of strategic consensus on the MS vary among companies. Even when strategic consensus exists between operators and managers, their underlying reasons often differ. Furthermore, the levels of strategic consensus vary among MS dimensions. The companies’ usage of information-sharing channels, along with their size and position in the supply chain, can be important for the level of strategic consensus.

    Originality/value – This paper contributes to the body of knowledge in three ways. First, it expands the scope of the MS dimensions under study, thus offering a stronger, resource-based perspective on MS and strategic consensus than what earlier studies showed. Second, it goes beyond the management level by including both managers and operators as the unit of analysis. Third, compared to previous research, it focuses on a new context and is based on indepth case studies.

  • 93.
    Eek, Magnus
    et al.
    Saab Aeronautics, Linköping, Sweden.
    Kharrazi, Sogol
    Swedish National Road and Transport Research Institute, Linköping, Sweden.
    Gavel, Hampus
    Saab Aeronautics, Linköping, Sweden.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Study of Industrially Applied Methods for Verification, Validation & Uncertainty Quantification of Simulator Models2015Ingår i: International Journal of Modeling, Simulation, and Scientific Computing, ISSN 1793-9623, E-ISSN 1793-9615, Vol. 6, nr 2, artikel-id 1550014Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    To better utilize the potential of system simulation models and simulators, industrially applicable methods for Verification, Validation and Uncertainty Quantification(VV&UQ) are crucial. This paper presents an exploratory case study of VV&UQ techniquesapplied on models integrated in aircraft system simulators at Saab Aeronauticsand in driving simulators at the Swedish National Road and Transport Research Institute(VTI). Results show that a large number of Verification and Validation (V&V)techniques are applied, some of which are promising for further development and use insimulator credibility assessment. Regarding the application of UQ, a large gap betweenacademia and this part of industry has been identified, and simplified methods areneeded. The applicability of the NASA Credibility Assessment Scale (CAS) at the studied organizations is also evaluated and it can be concluded that the CAS is consideredto be a usable tool for achieving a uniform level of V&V for all models included in asimulator, although its implementation at the studied organizations requires tailoringand coordination.

  • 94.
    Egeröd, Jens
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Logistik.
    Nordling, Emma
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Logistik.
    Strategic Supplier Evaluation - Considering environmental aspects2010Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This study aims at presenting a strategic supplier evaluation model that can assist Cederroth in strategic supplier selection and give indications on potential areas for strategic supplier development. The evaluation model aims at assessing supplier performance also with respect to environmental aspects. The final model has been developed through five steps, five models, with starting point in a theoretical review and basic empirical data. Following the model was developed through four iterations of workshops, interviews, weighting and case studies. The final model includes 7 criteria categories and 41 criteria whereas one category including 7 criteria assesses a supplier’s environmental performance.

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  • 95.
    Ekdahl, Fredrik
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Kvalitetsteknik. Linköpings universitet, Tekniska högskolan.
    On the Application of Designed Experimentation for Customer Focused Product Development1999Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Today, the use of statistical methods and tools for solving problems in industry is growing steadily. The increased application of statistics in industry is attributable to the many theoretical advancements made by researchers over the years, but also to the increased awareness in industry that statistical methods and tools constitute an important resource of great strategic value. The foundation of this thesis lies in the ideas presented by Walter A. Shewhart in the early 1930s and the influence they have on today's activities in industry. The thesis uses an integrated framework for linking customer satisfaction to product development activities to establish the relationship between Shewhart's statistical perspective and customer focused product development. In particular, the important role of designed experimentation in this framework is highlighted. In detail the following topics are considered.

    An important challenge facing product developers is to link customer satisfaction to development activities carried out within a company. Success in the marketplace is very much dependent on the ability to translate satisfaction into product properties and to do it as early as possible in the product development process. The use of Quality Function Deployment combined with Customer Satisfaction Modeling is presented as means for linking internal product development and improvement activities to increased customer satisfaction.

    Separating active factors from inert ones represents an important problem in the analysis of designed experiments. An extensive simulation study comparing eight procedures complementing the normal probability plot for this separation is presented. The study shows that only small differences appear between different procedures, regardless of complexity, when the sparsity assumption is not violated. As the number of active factors increases, so do the differences in the performance of the studied procedures. Among the best performing procedures is one that rests on a Bayesian foundation and utilizes generic a priori knowledge for the selection problem. To further improve its performance a modification is proposed that will allow introduction of more elaborate and foremost less generic domain knowledge. The performance of the modified procedure is evaluated in a simulation study and it is found that considerable improvements can be made unless the introduced domain knowledge strongly contradicts the reality. A procedure for construction of new contrasts supplementing the original experimental design is introduced that will allow more efficient use of the available data. The new contrasts can be defined in various ways and thereby be given different interpretations in order to serve special purposes according to the agenda of the analyst. Apart from an enhanced interpretation of the experimental results, these contrasts contribute to a more elaborate representation of the experimental error when using normal probability plotting.

    In an effort to encourage use and to illustrate the possible benefits from using Conjoint Analysis, a step-by-step introductory workflow is presented. One of the apparent problems when designing a conjoint analysis study is the conflict between including many product attributes and not overloading the respondents. Non-geometric Plackett-Burman designs represents a class of orthogonal designs that provide an opportunity to resolve this conflict. The use of non-geometric Plackett-Burman designs for conjoint analysis is advocated and a procedure that takes advantage of the special properties of the non-geometric Plackett-Burman designs is proposed and demonstrated.

  • 96.
    Eklund, Jörgen
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Tekniska fakulteten. KTH Royal Inst Technol, Sweden.
    Observation Methods in the Context of Interactive Research2019Ingår i: PROCEEDINGS OF THE 20TH CONGRESS OF THE INTERNATIONAL ERGONOMICS ASSOCIATION (IEA 2018), VOL VII: ERGONOMICS IN DESIGN, DESIGN FOR ALL, ACTIVITY THEORIES FOR WORK ANALYSIS AND DESIGN, AFFECTIVE DESIGN, SPRINGER INTERNATIONAL PUBLISHING AG , 2019, Vol. 824, s. 1845-1849Konferensbidrag (Refereegranskat)
    Abstract [en]

    An interactive research approach was applied in an evaluation of a potential organizational change for mail carriers. Interviews and observations were performed. The results showed that specialization of mail carriers into either mail sorting or mail delivery would lead to more monotonous jobs. Observations showed that sorting mail in a new district takes substantially more time than in a well-known district. An interactive research approach creates a participative collaboration between employers, union representatives and researchers within a project. This influences the choice, planning and execution of methods, of which observation is one. Through the interactive discussions, the planning of how, who, when and where to perform the observations can be improved. This contributes to creating better opportunities to obtain valid results. The use of video recordings enables joint analysis, which contributes to higher acceptance of outcomes and results. The overall conclusion is that the combination of an interactive approach and observation methods is a way to improve both methodological validity and higher validity of the results in addition to higher acceptance of the results and subsequent decisions.

  • 97.
    Ekstrand, Eva-Maria
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Biogas Research Center. Linköpings universitet, Filosofiska fakulteten.
    Karlsson, Marielle
    Linköpings universitet, Biogas Research Center. Linköpings universitet, Institutionen för tema. Linköpings universitet, Filosofiska fakulteten. Scandinavian Biogas Fuels AB, Sweden.
    Truong, Xu-Bin
    Linköpings universitet, Biogas Research Center. Scandinavian Biogas Fuels AB, Sweden.
    Björn, Annika
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Biogas Research Center. Linköpings universitet, Filosofiska fakulteten.
    Karlsson, Anna
    Linköpings universitet, Biogas Research Center. Scandinavian Biogas Fuels AB, Sweden.
    Svensson, Bo H.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Biogas Research Center. Linköpings universitet, Filosofiska fakulteten.
    Ejlertsson, Jörgen
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Biogas Research Center. Linköpings universitet, Filosofiska fakulteten. Scandinavian Biogas Fuels AB, Sweden.
    High-rate anaerobic co-digestion of kraft mill fibre sludge and activated sludge by CSTRs with sludge recirculation2016Ingår i: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 56, s. 166-172Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Kraft fibre sludge from the pulp and paper industry constitutes a new, widely available substrate for thebiogas production industry, with high methane potential. In this study, anaerobic digestion of kraft fibresludge was examined by applying continuously stirred tank reactors (CSTR) with sludge recirculation.Two lab-scale reactors (4L) were run for 800 days, one on fibre sludge (R1), and the other on fibre sludgeand activated sludge (R2). Additions of Mg, K and S stabilized reactor performance. Furthermore, theCa:Mg ratio was important, and a stable process was achieved at a ratio below 16:1. Foaming was abatedby short but frequent mixing. Co-digestion of fibre sludge and activated sludge resulted in more robustconditions, and high-rate operation at stable conditions was achieved at an organic loading rate of 4 gvolatile solids (VS) L1 day1, a hydraulic retention time of 4 days and a methane production of230 ± 10 Nm L per g VS.

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  • 98.
    Ekstrand, Jonathan
    et al.
    Linköpings universitet, Institutionen för beteendevetenskap och lärande, Pedagogik och sociologi.
    Hallberg, Oscar
    Linköpings universitet, Institutionen för beteendevetenskap och lärande, Pedagogik och sociologi.
    Rekryterares uppfattning av anonymisering: Tankar kring ett första urval2019Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Uppsatsen syftar till att studera verksamma HR(Human resources)-praktiker inom rekryteringsområdets uppfattning gentemot användningen av ett anonymiserat första urval i rekryteringsprocessen. För att studera detta formuleras frågeställningar kring hur ett anonymiserat urval uppfattas av dessa praktiker samt vilka negativa och positiva aspekter de kan identifiera med ett sådant arbetssätt. Studien ämnar att undersöka detta via en kvalitativ studie med en induktiv ansats. Datainsamlingen sker via semistrukturerade intervjuer där praktikernas uppfattningar kring ämnet skiljer sig markant. Anonymisering ses som ett gynnsamt verktyg för kandidater där de får en mer rättvis chans att avancera i rekryteringsprocesser på bekostnad av rekryteraren som får en större arbetsbelastning. Studien mynnar ut i att rekryteringsförfarandet präglas av en situationsbetingad paradigm där olika organisationer är i behov av olika åtgärder. Således kan ett anonymiserat urval anses behövligt i organisationer där diskriminering förekommer medan organisationer med redan standardiserade och beprövade processer kan anse det som överflödigt.

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    Rekryterades uppfattning av anonymisering
  • 99.
    Elg, Mattias
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Logistik- och kvalitetsutveckling. Linköpings universitet, Tekniska fakulteten.
    Gremyr, Ida
    Chalmers tekniska högskola.
    Martin, Jason
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Logistik- och kvalitetsutveckling. Linköpings universitet, Tekniska fakulteten.
    Birch-Jensen, Andrea
    Chalmers tekniska högskola.
    The Future of Work for Quality Management – Challenges in the Digitalized Era2018Konferensbidrag (Refereegranskat)
    Abstract [en]

    Purpose Digitalization provides both challenges and opportunities for Quality Management (QM). The purpose of this paper is to identify challenges induced by digitalization on current QM practices, in order to uncover the potential of how QM may support digitalization in organizations. This issue is addressed through an analytical framework that stresses two dimensions: first exploration and exploitation of digitalized QM processes and second value creation, which is performed by the customer or in interaction facilitated by the provider.

    Design/methodology/approach This paper is based on a cross-case study design with interview data collected from 33 quality management professionals in four large Swedish organizations.

    Findings Six different challenges and corresponding roles are proposed for QM: The gardener involved in the design of the many different currently utilized technologies; the bridge-builder - a role that connects implemented digitalized solutions that enable the movement from human-to-human to a human-to-digital interface; the assistant a contributor to better value in the customer sphere for already implemented digitalized solutions; the architect including planning, designs, and reviews together with many different stakeholders; the connector focusing on the continuous management of value-in-use and open up for  opportunities for continuous interaction and value-adding;  and explorer drawing attention towards the challenges of the existing power structures.

    Originality/value This paper contributes with empirical evidence on challenges induced by digitalization, an area often discussed but not as often studied empirically.  Further, the study identifies challenges of digitalization affecting both exploitative and explorative practices throughout an organisations value-creation process.

  • 100.
    Elg, Mattias
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Kvalitetsteknik. Linköpings universitet, Tekniska högskolan.
    Kollberg, Beata
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell marknadsföring och industriell ekonomi. Linköpings universitet, Tekniska högskolan.
    En metodansats för utvärdering av prestionsmätningssystem2004Rapport (Övrigt vetenskapligt)
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