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  • 151.
    Henriksson, Fredrik
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    An outlook on multi material body solutions in the automotive industry – possibilities and manufacturing challenges2016Ingår i: SAE Technical Paper Series, Detroit (MI), USA: Society of Automotive Engineers, 2016Konferensbidrag (Refereegranskat)
    Abstract [en]

    In the automotive industry, mass reduction and lightweight design is a continuing trend that does not show signs of declining. When looking at where to reduce weight in a vehicle, the body is a preferential subsystem due to its large contribution to overall mass and the stability of body composition over a specific model range. The automotive industry of today moves toward a greater differentiation in materials that compose a car, which can be seen in the several different multi material vehicle bodies that have been introduced by manufacturers in recent years. But while mixing materials may contribute to a good compromise between weight reduction and vehicle cost, it also proposes a number of challenges that need to be addressed. Among other material factors, the different coefficients of thermal expansions might introduce new stresses during painting and curing. Joining processes and possible chemical reactions between materials also needs to be taken into account, the same with the question of whether to integrate or differentiate different functions in a system. If the manufacturing plant uses mixed model assembly lines, design of end effectors for gripping multiple different materials is another challenge not previously encountered in this context. In this paper, a number of production and manufacturing related challenges are discussed, and the authors highlight different areas where the requirements of design engineering tools needs to be evaluated for these new multi material concepts and design decisions in order for automotive manufacturers to ensure future market competitiveness.

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  • 152.
    Henriksson, Fredrik
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Including Student Case Projects in Integrated Product and Production Development Research – Methodology Description and Discussion2016Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Within integrated product and production development research, casestudies needto be performed for data gathering purposes. Today, there are two commonly used ways to perform this research; observingindustry projects orhaving the researchers perform the projects themselves. The first option can pose data access and IPRissues, and the second optioncomes with biasing risks. Another approach is to work with studentcaseprojects, givingstudents interesting projects and findinga solution to mediate both data gathering opportunity and biasing risks. This approach has been tested at Linköping University, with students performing projects in the Vinnovafunded Production 2030 –Large Scale Production in Mixed Materials project. Two larger student case projects have been performed on the topic of material substitution and mixed material solutions within the automotive industry.In this paper, the method used to include student projects is presented along with identified benefits and drawbacks. Including student case projects in research have shown to be beneficial in research on processes, projects and methodology, but needs to be complemented by data fromindustry projects and the researcher ́s own work within integrated product and production development in order to create a more reliable analysis with high level of detail.

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    Including Student Case Projects in Integrated Product and Production Development Research – Methodology Description and Discussion
  • 153.
    Henriksson, Fredrik
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    On Material Substitution in Automotive BIWs – From Steel to Aluminum Body Sides2016Ingår i: 26TH CIRP DESIGN CONFERENCE / [ed] Wang, Lihui; Kjellberg, Torsten, Elsevier, 2016, Vol. 50, s. 683-688Konferensbidrag (Refereegranskat)
    Abstract [en]

    Weight reduction and material substitution are increasing trends in the automotive industry. In this project, the task of substituting the steel body side in the monocoque of a large SUV towards an aluminum body side was investigated through a design engineering approach adopting a breadth-first analysis method. One conclusion based on the analysis is that the choice of joining technology would become arbitrary due to the breadth-first approach. In this paper, the authors present their findings from the aforementioned case, including the challenges with switching between materials with fundamentally different properties when performing material substitution projects. The possibility of having taken a depth-first analysis approach, and the possible effects on the project result, is discussed.

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  • 154.
    Henriksson, Fredrik
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Product development in the Swedish Automotive industry: Can design tools be viewed as decision support systems?2015Ingår i: / [ed] Anthony SF Chiu, International Foundation for Production Research (IFPR) , 2015Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Design engineers working in the automotive industry have to take many design decisions, based on numerous diverse criteria. This results in a high workload of complex decisions. One way to reduce decision complexity and improve decisions could be to improve design tools. Decision support systems (DSSs) have been used in a managerial context to improve decisions. In this article, the authors assess whether design tools generally can be viewed as DSSs. A combination of literature review, surveys and qualitative interviews with seven design engineers was used to assess whether current design tools function as decision supports in product development. Although the specific design context needs to be considered, this study’s results suggest that design tools can generally function as DSSs. In future work, the adaptability to different problem solving patterns needs further in-depth research in the form of individual studies for specific tools in specific contexts.

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  • 155.
    Henriksson, Fredrik
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Towards Applying The Boothroyd, Dewhurst and Knight Methodology for Cost Estimation on Fibre Composite Manufacturing - A Theoretical Approach2014Ingår i: Proceedings of The 6th International Swedish Production Symposium 2014 / [ed] Johan Stahre, Björn Johansson, Mats Björkman, Gothenburg, 2014Konferensbidrag (Refereegranskat)
    Abstract [en]

    Increased usage of carbon fibre composite poses challenges for the automotive industry; one is to manage carbon fibre composites within the product development process. This paper combines knowledge in design engineering, material science and production technology, aiming to bridge these domains. The study indicates that mass production methods suitable for carbon fibre have several factors in common with traditional polymer production methods. Thus, it is possible that DfMA methods for traditional polymer production can be adjusted for carbon fibre composite production. The result is summarised in a table aiming to facilitate engineering decisions related to cost estimations for composite moulding.

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  • 156.
    Henriksson, Fredrik
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Wever, Renee
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Berry, Patrick
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Student-developed laboratory exercises - An approach to cross-disciplinary peer education2016Ingår i: Proceedings of NordDesign 2016: part 2, The Design Society, 2016, s. 226-235Konferensbidrag (Refereegranskat)
    Abstract [en]

    With new technologies and demands from industry, universities need to adapt in order to educate engineers suited for the job market of tomorrow. Focusing on the fields of product development and mechanical engineering, topics such as new lightweight materials and lightweight designs are currently a focus of many industries, and the demand from industry is that engineers graduating should have some knowledge in these fields. In this case, a project was set up for a student-developed laboratory exercise in lightweight material, focusing on the interconnection between material properties, geometry and manufacturing technology in order to fulfil a contextual requirement. The industry chosen was the aircraft industry, due to its heavy emphasis on light weight. The chosen component (a civil aircraft radome) meant that material properties not necessarily connected to high specific strength became important, something that adds educational value to the exercise. Since the introduction of the exercise, the plan is to introduce the laboratory exercise in more courses where the interdisciplinary connections between material properties, geometry and manufacturing technology needs to be explained for students as well as evaluate how this approach to exercise development can be improved and further utilized. This paper presents the learnings from setting up the laboratory exercise, as well as discusses the possibilities of thesis works as an enabler for peer education and puts these in a context for a future, adaptive engineering education that quickly can add or renew material in the curriculum without substantial investment of resources.

  • 157.
    Henriksson, Fredrik
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Wilhelmsson, Malin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    University as a Laboratory: Exploring how engineering education can support industrial needs2018Ingår i: NordDesign 2018: DESIGN IN THE ERA OF DIGITALIZATION / [ed] Ekströmer, Philip; Schütte, Simon and Ölvander, Johan, 2018Konferensbidrag (Refereegranskat)
    Abstract [en]

    Universities have two major tasks; generating knowledge through research and educating students for academia, the public sector and the industry. In this paper, the authors explore how engineering education can support industrial needs on two fronts: creating a case study platform for research and preparing graduating engineering students to become more capable engineers when beginning their working life in industry, by applying the ""University as a laboratory"" concept. ""University as a laboratory"", as coined by Henriksson (2017), means that research-based case study projects are brought into educational courses where students are assigned to work as engineering designers, and researchers can observe problem solving patterns and evaluate different methodologies (also presented by Henriksson and Johansen (2016)). Though the concept have been presented earlier (Henriksson and Johansen 2016, Henriksson 2017), a more thorough evaluation is in order to further understand the effects of integrating research and education in the ""University as a laboratory"" concept. This is done through the performance and evaluation of a research-based engineering design education project in collaboration with automotive industrial partners; a project on lightweight and sustainable product and production development. The study evaluates three aspects of the project; the researchers' view, the teachers' view and the students' view. Data on all three aspects has been gathered through group interviews, observations and written assignments during the project, as well as interviews with participating students one year after the end of the project and workshops with researchers and teachers involved in the project. Analysis has been done on a qualitative basis, to investigate whether case projects are suitable for deep understanding in engineering fields and whether project courses are suitable to test different approaches of integrated product and production development.

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  • 158.
    Herzog, Erik
    et al.
    Saab Aerosystems, Sweden.
    Andersson, Henric
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Initial Experience in Contracts Based Systems Engineering2009Ingår i: Proceedings of the 19th Annual International Symposium of INCOSE / [ed] INCOSE, 2009Konferensbidrag (Refereegranskat)
    Abstract [en]

    Engineering process efficiency is the target of any systems engineering organisation. In this paper we review initial experience from applying the Contracts based systems engineering method developed by the SPEEDS project. The method is outlined along with experience gathered from pilot projects performed at SAAB Aerosystems. Outlines for adapting the method to mainstream tools as well as future adoption activities are also presented.

  • 159.
    Herzog, Erik
    et al.
    Saab Aerosystems, Sweden.
    Andersson, Henric
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Hallonquist, Jessica
    Saab AB.
    Experience from Introducing SysML into a Large Project Organisation2010Ingår i: Proceedings of the 20th Annual INCOSE International Symposium / [ed] INCOSE, 2010Konferensbidrag (Refereegranskat)
    Abstract [en]

    Introducing a model centric way of working in large organisations is difficult. At SAAB Aerosystems it has been tried over multiple years in many projects. Success has been limited. In our latest attempt to introducing SysML as a tool for system design it was decided to change focus. Instead of trying to promote models as the new way of documentation it was decided to setup the tools with the objective to create consistent and readable document centric deliverables. Instead of giving the modellers the freedom to use the language at its extreme, it was decided to limit language use to an absolute minimum. As a result there have been some quite drastic initial complaints from our some experienced modellers, but surprisingly strong acceptance of the new approach to modelling from the stakeholders responsible for quality control, but not directly involved in the core development team.

  • 160.
    Holm, Kristofer
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Lundqvist, Victor
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Produktutveckling av ett tandborsttillbehör2015Självständigt arbete på grundnivå (kandidatexamen), 10,5 poäng / 16 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Prodelox AB är en produktutvecklingsfirma som hjälper sina kunder med komplett produktutveckling. På senare tid har företaget sett ett ökat intresse för crowdfunding och hur detta kan användas i samband med produktutvecklingsuppdrag för finansiering. Crowdfunding bygger på att en grupp människor investerarpengar för att se projekt bli till verklighet. Pengarna används oftast till att färdigställa produkten för serietillverkning.

    Detta arbete syftar till att utveckla en produktmed potential för en lyckad crowdfunding-kampanj samt att göra en rapport om crowdfunding med inriktning på produktutveckling. Produkten som utvecklats är ett tandborststillbehör som räknar antal slag som utförs under borstningen.

    Efter avslutat arbete kan det konstateras att tandborststillbehöret som utvecklats har stor potential. Vidare arbete med förberedelser för lansering till exempelmarknadsföring, skapandet av en kampanj och framtagning av serietillverkningsunderlag krävs.

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  • 161.
    Holmqvist, Sofia
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Svensson, Moa
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Development of an Indoor Cultivation Product for Restaurant Environments: Developing a Product Specification and Creating a Product Concept using User-Centered Design2019Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    In today’s society there is a growing awareness of where food is produced and there is a trend to use locally grown produce in restaurants. One way for restaurants to differentiate themselves is to grow the produce inside the restaurant. This thesis has the aim on identifying the problems and user needs for an indoor cultivation solution and developing a new indoor cultivation product that solves the identified problems and meet the user needs. To achieve this aim, a usercentered design approach was utilised and the following three research questions were answered:

    • How can the needs of the user be translated into a product specification for indoor cultivation in restaurants?
    • What are the functionality, usability, and construction requirements for an indoor cultivation product in a restaurant?
    • What product concept can be designed to grow classic herbs in restaurants based on the needs of the user?

    To identify the needs interviews were performed with the users. The needs were then translated, together with the company’s needs, into a product specification. This was done in two steps, identifying the metrics and setting values. Some of the most important requirements are that a hydroponic system is used, that the product is easy to clean and is moveable.

    The product development process was iterative and included different ideation, development and evaluation methods. The users were involved in some of the evaluation methods to give input on the final design. Their opinion, together with evaluations based on the product specification, were used when choosing the final concept Lärad. Lärad uses a circulating hydroponic system and have three separate growing containers each containing 16 plants. The growing containers can be pulled out to enable easy access of the plants. Both the water system and the LED grow lights, that replaces natural sunlight, are controlled automatically to minimise the users’ involvement. To test the concept, to see how well the product specification is fulfilled, both a CAD model and a functional prototype were created. The results from the tests were, even at the concept stage, that 97% of all the tested requirements were fulfilled which shows that the concept is suitable for indoor cultivation in a restaurant environment. Some further work that includes refining the design and optimising for production will be needed to launch the product.

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  • 162.
    Honarpardaz, M.
    et al.
    ABB, Sweden.
    Tarkian, Mehdi
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Feng, X.
    ABB, Sweden.
    Finger design automation for industrial robot grippers: A review2017Ingår i: ROBOTICS AND AUTONOMOUS SYSTEMS, ISSN 0921-8890, Vol. 87, s. 104-119Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Designing robust end-effector plays a crucial role, in performance of a robot workcell. Design automation of industrial grippers fingers/jaws is therefore of the highest interest in the robot industry. This paper systematically reviews the enormous studies performed in relevant research areas for finger design automation. Key processes for successfully achieving automatic finger design are identified and research contributions in each key process are critically reviewed. The proposed approaches in each key process are analyzed, verified and benchmarked. The most promising methods to accomplish finger design automation are highlighted and presented. (C) 2016 Elsevier B.V. All rights reserved.

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  • 163.
    Honarpardaz, Mohammadali
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Finger Design Automation for Industrial Robots: A Generic and Agile Approach2018Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    ROBOT fingers play a crucial role in the success and performance of workcells, as fingers are the only interfaces that connect the robot to the physical working environment. Fingers are responsible for grasping and manipulating workpieces without dropping or damaging them. Designing industrial robot fingers to accomplish assigned tasks is therefore tremendously complex and requires high skills in robotics and designing at the same time.

    Today, there is a trend toward products with short lifecycles and, as a result, many robot industries have focused on enhancing the competitiveness of robotic automation in the agile market. SARAFun and Factory-in-a-day are two large European Commission projects which are formed to enable a non-expert user to integrate a robot system for an assembly task in one single day. Currently, fingers of industrial grippers (e.g. parallel- jaw) are designed manually, a process that requires several exhaustive and time- consuming trial and error iterations even for highly skilled specialists. The average iteration time is about three to four working days and the total time for designing fingers can amount to around two weeks depending on the complexity requirements.

    The present iterative procedure of manual finger design is unable to fulfil the demands of ‘‘burst’’ production (i.e. ramp up to full volume in a very short time, run production for 3–12 months, and then change to produce a new product). Finger design automation has therefore been increasingly attracting the attention of the robot industry. However, very few researchers have studied finger design automation and unfortunately no one has validated the proposed approaches with a generic experimental method.

    This research therefore proposes the generic optimized finger design (GOFD) framework in order to automate the design process of robotic fingers. The framework is optimized to reduce the design process time while maintaining high reliability and performance of the fingers. The functionality and general applicability of the framework is examined in various case studies and applications with a diverse range of workpieces. In order to be able to benchmark the functionality of robotic fingers, an experimental method is also developed to measure the stability and performance of the fingers in industrial practice. The proposed experimental method is employed to evaluate the functionality of the GOFD fingers and compare it with that of other fingers. Results are comprehensively analysed and the strengths and weaknesses of each method are highlighted. This thesis thus presents a design automation processes that automates the design procedure for robotic fingers, together with an experimental method to compare the performance of different finger designs. The introduced GOFD method can help robot industries comply with the trending agile market. Moreover, scholars who are inexpert in robotics may benefit from utilizing GOFD in their research to generate functional fingers.

    Delarbeten
    1. Finger design automation for industrial robot grippers: A review
    Öppna denna publikation i ny flik eller fönster >>Finger design automation for industrial robot grippers: A review
    2017 (Engelska)Ingår i: ROBOTICS AND AUTONOMOUS SYSTEMS, ISSN 0921-8890, Vol. 87, s. 104-119Artikel, forskningsöversikt (Refereegranskat) Published
    Abstract [en]

    Designing robust end-effector plays a crucial role, in performance of a robot workcell. Design automation of industrial grippers fingers/jaws is therefore of the highest interest in the robot industry. This paper systematically reviews the enormous studies performed in relevant research areas for finger design automation. Key processes for successfully achieving automatic finger design are identified and research contributions in each key process are critically reviewed. The proposed approaches in each key process are analyzed, verified and benchmarked. The most promising methods to accomplish finger design automation are highlighted and presented. (C) 2016 Elsevier B.V. All rights reserved.

    Ort, förlag, år, upplaga, sidor
    ELSEVIER SCIENCE BV, 2017
    Nyckelord
    Grippers fingers; Design automation; Grasp synthesis; Grasp analysis
    Nationell ämneskategori
    Robotteknik och automation
    Identifikatorer
    urn:nbn:se:liu:diva-134073 (URN)10.1016/j.robot.2016.10.003 (DOI)000390507700008 ()
    Anmärkning

    Funding Agencies|European Community [644938 - SARAFun]

    Tillgänglig från: 2017-01-26 Skapad: 2017-01-22 Senast uppdaterad: 2018-02-09
    2. GENERIC AUTOMATED FINGER DESIGN
    Öppna denna publikation i ny flik eller fönster >>GENERIC AUTOMATED FINGER DESIGN
    Visa övriga...
    2016 (Engelska)Ingår i: PROCEEDINGS OF THE ASME INTERNATIONAL DESIGN ENGINEERING TECHNICAL CONFERENCES AND COMPUTERS AND INFORMATION IN ENGINEERING CONFERENCE, 2016, VOL 5B, AMER SOC MECHANICAL ENGINEERS , 2016, artikel-id V05BT07A071Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    Finger design automation for grippers is one of the areas of highest interest for robot industries. The few studies that have been carried out in the finger design automation research area are limited to objects with specific geometrical properties (e.g. polyhedral). This paper introduces the Generic Automated Finger Design (GAFD) method that contains the essential key processes for automatic design of reliable fingers. The proposed method is implemented on two geometrically complex workpieces and appropriate fingers are designed. The results are discussed in detail and benchmarked against existing approaches.

    Ort, förlag, år, upplaga, sidor
    AMER SOC MECHANICAL ENGINEERS, 2016
    Nationell ämneskategori
    Interaktionsteknik
    Identifikatorer
    urn:nbn:se:liu:diva-135414 (URN)10.1115/DETC2016-60514 (DOI)000393365000071 ()978-0-7918-5016-9 (ISBN)
    Konferens
    ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE)
    Anmärkning

    Funding Agencies|European Community [644938]

    Tillgänglig från: 2017-03-14 Skapad: 2017-03-14 Senast uppdaterad: 2018-02-09
    3. Generic Automated Multi-function Finger Design
    Öppna denna publikation i ny flik eller fönster >>Generic Automated Multi-function Finger Design
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    2016 (Engelska)Ingår i: 2016 SECOND INTERNATIONAL CONFERENCE ON MECHANICAL ENGINEERING AND AUTOMATION SCIENCE (ICMEAS 2016), IOP PUBLISHING LTD , 2016, Vol. 157, artikel-id 012015Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    Multi-function fingers that are able to handle multiple workpieces are crucial in improvement of a robot workcell. Design automation of multi-function fingers is highly demanded by robot industries to overcome the current iterative, time consuming and complex manual design process. However, the existing approaches for the multi-function finger design automation are unable to entirely meet the robot industries need. This paper proposes a generic approach for design automation of multi-function fingers. The proposed approach completely automates the design process and requires no expert skill. In addition, this approach executes the design process much faster than the current manual process. To validate the approach, multi-function fingers are successfully designed for two case studies. Further, the results are discussed and benchmarked with existing approaches.

    Ort, förlag, år, upplaga, sidor
    IOP PUBLISHING LTD, 2016
    Serie
    IOP Conference Series-Materials Science and Engineering, ISSN 1757-8981
    Nationell ämneskategori
    Byggproduktion
    Identifikatorer
    urn:nbn:se:liu:diva-133767 (URN)10.1088/1757-899X/157/1/012015 (DOI)000389913900014 ()
    Konferens
    2nd International Conference on Mechanical Engineering and Automation Science (ICMEAS)
    Tillgänglig från: 2017-01-09 Skapad: 2017-01-09 Senast uppdaterad: 2018-03-22
    4. Experimental verification of design automation methods for robotic finger
    Öppna denna publikation i ny flik eller fönster >>Experimental verification of design automation methods for robotic finger
    2017 (Engelska)Ingår i: Robotics and Autonomous Systems, ISSN 0921-8890, E-ISSN 1872-793X, Vol. 94, s. 89-101Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Design automation of industrial grippers is a hot research topic for robot industries. However, literature lacks a standard experimental method to enable researchers to validate their approaches. Thus, this paper proposes a generic experimental method to verify existing finger design approaches. The introduced method is utilized to validate the methods Generic Automated Finger Design (GAFD), Manually Designed Fingers (MDF) and the eGrip tool. Experimental results are compared and the strengths and weaknesses of each method are presented. (C) 2017 The Authors. Published by Elsevier B.V.

    Ort, förlag, år, upplaga, sidor
    ELSEVIER SCIENCE BV, 2017
    Nyckelord
    Grippers; Fingers; Design automation; Robotics; Experimental method
    Nationell ämneskategori
    Robotteknik och automation
    Identifikatorer
    urn:nbn:se:liu:diva-139386 (URN)10.1016/j.robot.2017.04.011 (DOI)000404201700009 ()
    Anmärkning

    Funding Agencies|European Communitys Framework Programme Horizon 2020 [644938 - SARAFun]

    Tillgänglig från: 2017-08-07 Skapad: 2017-08-07 Senast uppdaterad: 2018-02-09
    5. Fast Grasp Tool Design: From Force to Form Closure
    Öppna denna publikation i ny flik eller fönster >>Fast Grasp Tool Design: From Force to Form Closure
    2017 (Engelska)Ingår i: 2017 13th IEEE Conference on Automation Science and Engineering (CASE), IEEE , 2017Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    We present a novel technique which integratesautomatic, part centered design of customized fingertips with agrasp planning stage for arbitrary parts of an assembly process.Starting with a set of CAD models of parts in an assemblysequence, force closure grasps are generated for each part in asampling process. By employing the sampled force closure grasppositions in the second stage, the fingertip shape model isadapted to obtain form closure grasps at the specific grasplocations on the part. This approach significantly reduces theprocess time of designing fingers. Furthermore, the methodincreases the robustness of the fingers grasp for preciseassemblies. The proposed fast generic automated finger design(FGAFD) method is able to design fingers for variousgeometrically complex workpieces. The designed fingers areexperimentally verified. The results are discussed in detail andbenchmarked against existing approaches.

    Ort, förlag, år, upplaga, sidor
    IEEE, 2017
    Serie
    Conference on Automation Science and Engineering (CASE), ISSN 2161-8089
    Nyckelord
    Grasp Planning; Finger Design; Design Automation; Grasp Synthesis; Robotics;
    Nationell ämneskategori
    Robotteknik och automation
    Identifikatorer
    urn:nbn:se:liu:diva-143804 (URN)10.1109/COASE.2017.8256199 (DOI)978-1-5090-6781-7 (ISBN)978-1-5090-6782-4 (ISBN)
    Konferens
    Conference on Automation Science and Engineering (CASE), 20-23 Aug. 2017
    Projekt
    SARAFun
    Forskningsfinansiär
    EU, Horisont 2020, 644938
    Tillgänglig från: 2017-12-18 Skapad: 2017-12-18 Senast uppdaterad: 2018-07-03
    6. Fast finger design automation for industrial robots
    Öppna denna publikation i ny flik eller fönster >>Fast finger design automation for industrial robots
    2019 (Engelska)Ingår i: Robotics and Autonomous Systems, ISSN 0921-8890, E-ISSN 1872-793X, Vol. 113, s. 120-131Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Finger design automation is highly demanded from robot industries to fulfill the requirements of the agile market. Nevertheless, literature lacks a promising approach to automate the design process of reliable fingers for industrial robots. Hence, this work proposes the generic optimized finger design (GOFD) method which automates the design process of single- and multi-function finger grippers. The proposed method includes an optimization algorithm to minimize the design process time. The method is utilized to generate fingers for several groups of objects. Results show that the GOFD method outperforms existing methods and is able to reduce the design time by an average of 16,600 s. While the proposed method substantially reduces the design process time of fingers, the quality of grasps is comparable to the traditional exhaustive search method. The grasp quality of GOFD deviates only 0.47% from the absolute best grasp known from the exhaustive search method in average. The designed fingers are lastly manufactured and experimentally verified.

    Ort, förlag, år, upplaga, sidor
    Elsevier, 2019
    Nyckelord
    Design automation, Fingers design, Multi-function fingers, Industrial grippers, Optimization, Robotics
    Nationell ämneskategori
    Design Robotteknik och automation
    Identifikatorer
    urn:nbn:se:liu:diva-153950 (URN)10.1016/j.robot.2018.12.011 (DOI)000459358000010 ()2-s2.0-85060074455 (Scopus ID)
    Anmärkning

    Funding agencies: European Communitys Framework Programme Horizon 2020 [644938 - SARAFun]

    Tillgänglig från: 2019-01-21 Skapad: 2019-01-21 Senast uppdaterad: 2019-03-29Bibliografiskt granskad
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    presentationsbild
  • 164.
    Honarpardaz, Mohammadali
    et al.
    ABB Corporate Research, Västerås, Sweden.
    Andersson (Ölvander), Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Tarkian, Mehdi
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Fast finger design automation for industrial robots2019Ingår i: Robotics and Autonomous Systems, ISSN 0921-8890, E-ISSN 1872-793X, Vol. 113, s. 120-131Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Finger design automation is highly demanded from robot industries to fulfill the requirements of the agile market. Nevertheless, literature lacks a promising approach to automate the design process of reliable fingers for industrial robots. Hence, this work proposes the generic optimized finger design (GOFD) method which automates the design process of single- and multi-function finger grippers. The proposed method includes an optimization algorithm to minimize the design process time. The method is utilized to generate fingers for several groups of objects. Results show that the GOFD method outperforms existing methods and is able to reduce the design time by an average of 16,600 s. While the proposed method substantially reduces the design process time of fingers, the quality of grasps is comparable to the traditional exhaustive search method. The grasp quality of GOFD deviates only 0.47% from the absolute best grasp known from the exhaustive search method in average. The designed fingers are lastly manufactured and experimentally verified.

    Ladda ner fulltext (pdf)
    fulltext
  • 165.
    Honarpardaz, Mohammadali
    et al.
    ABB, Sweden.
    Tarkian, Mehdi
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Feng, Xiaolong
    ABB, Sweden.
    Sirkett, Daniel
    ABB, Sweden.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    GENERIC AUTOMATED FINGER DESIGN2016Ingår i: PROCEEDINGS OF THE ASME INTERNATIONAL DESIGN ENGINEERING TECHNICAL CONFERENCES AND COMPUTERS AND INFORMATION IN ENGINEERING CONFERENCE, 2016, VOL 5B, AMER SOC MECHANICAL ENGINEERS , 2016, artikel-id V05BT07A071Konferensbidrag (Refereegranskat)
    Abstract [en]

    Finger design automation for grippers is one of the areas of highest interest for robot industries. The few studies that have been carried out in the finger design automation research area are limited to objects with specific geometrical properties (e.g. polyhedral). This paper introduces the Generic Automated Finger Design (GAFD) method that contains the essential key processes for automatic design of reliable fingers. The proposed method is implemented on two geometrically complex workpieces and appropriate fingers are designed. The results are discussed in detail and benchmarked against existing approaches.

  • 166.
    Honarpardaz, Mohammadali
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Tekniska fakulteten. ABB, Sweden.
    Tarkian, Mehdi
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Sirkett, D.
    ABB, Sweden.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Feng, Xiaolong
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten. ABB, Sweden.
    Elf, J.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Sjögren, R.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Generic Automated Multi-function Finger Design2016Ingår i: 2016 SECOND INTERNATIONAL CONFERENCE ON MECHANICAL ENGINEERING AND AUTOMATION SCIENCE (ICMEAS 2016), IOP PUBLISHING LTD , 2016, Vol. 157, artikel-id 012015Konferensbidrag (Refereegranskat)
    Abstract [en]

    Multi-function fingers that are able to handle multiple workpieces are crucial in improvement of a robot workcell. Design automation of multi-function fingers is highly demanded by robot industries to overcome the current iterative, time consuming and complex manual design process. However, the existing approaches for the multi-function finger design automation are unable to entirely meet the robot industries need. This paper proposes a generic approach for design automation of multi-function fingers. The proposed approach completely automates the design process and requires no expert skill. In addition, this approach executes the design process much faster than the current manual process. To validate the approach, multi-function fingers are successfully designed for two case studies. Further, the results are discussed and benchmarked with existing approaches.

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    fulltext
  • 167.
    Honarpardaz, Mohammadali
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Tekniska fakulteten. ABB Corporate Research Centre, Sweden.
    Tarkian, Mehdi
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Feng, X.
    ABB Corporate Research Centre, Sweden.
    Experimental verification of design automation methods for robotic finger2017Ingår i: Robotics and Autonomous Systems, ISSN 0921-8890, E-ISSN 1872-793X, Vol. 94, s. 89-101Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Design automation of industrial grippers is a hot research topic for robot industries. However, literature lacks a standard experimental method to enable researchers to validate their approaches. Thus, this paper proposes a generic experimental method to verify existing finger design approaches. The introduced method is utilized to validate the methods Generic Automated Finger Design (GAFD), Manually Designed Fingers (MDF) and the eGrip tool. Experimental results are compared and the strengths and weaknesses of each method are presented. (C) 2017 The Authors. Published by Elsevier B.V.

    Ladda ner fulltext (pdf)
    fulltext
  • 168.
    Håkman, Marcus
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Tillberg, Max
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Design och Kalibrering av mätrigg för Poly-V remmar2011Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Scania är en av världens största tillverkare av lastbilar, bussar och marina motorer och examensarbetet har utförts i syfte att utveckla en ny remmätrigg för att bättre kunna verifiera slitage, livslängd och töjning efter olika testcykler på Poly-V remmar. Riggen skall utföra mätningar enligt standard SAE-J1459 och klara att mäta remlängder mellan 1000-3300 mm. Därtill måste konstruktionen vara utformad enligt gällande säkerhetsföreskrifter och ergonomiska aspekter beaktas.

    Mätningar av Poly-V remmar sker efter principen att remmen spänns in mellan två remskivor med en kraft på 100 N per ribba.

    Vid examensarbetets start fanns en äldre mätrigg att tillgå, vilken inte längre är i bruk p.g.a. att den inte uppfyller alla krav för mätprocessen. Den har dock använts i syfte för att identifiera ergonomi- och säkerhetsrisker. Påvisade risker har sedan beaktats vid utformningen av koncept, för att begränsa dessa vid konstruktion av den nya mätriggen.

    Konstruktionen av den nya remmätriggen är framtagen med hjälp av erkänd produktutvecklingsmetodik, med arbete från idé till färdig produkt. Allt i enlighet med en förstudie i konstruktionsmetodik, en konceptstudie som behandlar ett flertal koncept, konceptval och analys av teknisk utrustning som används i den nya konstruktionen samt konstruktionsarbete och utvärdering.

    Vid examensarbetets slut har en färdigmonterad remmätrigg levererats klar för användning. Konstruktionen klarar att mäta remlängder mellan 1000-3300 mm och upp till tolv ribbor. Mätprocessen enligt SAE-J1459 kan utföras samtidigt som riggen är utformat med ergonomi och säkerhet i åtanke. Tillhörande remmätriggen finns en användarmanual som beskriver rutiner kring användning av utrustningen, risker och själva mätprocessen steg för steg.

    I rapporten bilagas en förstudie inom ergonomi och säkerhet, som har utförts vid examensarbetets första fas med syfte att användas som grund vid utformningen av den nya riggen. Det för garantera att hänsyn är tagen till gällande ergonomi- & arbetsmiljö-föreskrifter.

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    Design och Kalibrering av mätrigg för Poly-V remmar
  • 169.
    Ivarsson, Kristoffer
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Jilderfält, Gustav
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Handburen dykdator: Konstruktion av en produkt som tillåter användning av en mobiltelefon som dykdator2016Självständigt arbete på grundnivå (kandidatexamen), 10,5 poäng / 16 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Denna rapport beskriver ett examensarbete vars huvudsakliga uppgift har varit att ta fram ett förslag på en ny produkt åt Aqwary AB som tillåter användning av en mobiltelefon som dykdator. Detta är relevant då det ska hjälpa dykcenter att intressera nya dykare och öka deras entusiasm genom att göra sporten både enklare och mer social. En konceptstudie har initierats med de inledande faserna i Liedholms etablerade produktutvecklingsmetod och avslutats med en egen tolkning av konceptframtagningen och resulterat i ett slutkoncept. Detta koncept har vidareutvecklats och designats för att vara ergonomiskt med hjälp av en marknadsundersökning. Resterande design har skett med hänsyn till tillverkning, hållfasthetsberäkningar samt nyskapande idéer med ursprung i befintliga produkter.Arbetet har resulterat i ett fullt utvecklat och dimensionerat koncept med tillhörande konstruktionsunderlag i form av både 3D-modeller och ritningar. Resultatet stämdes av mot en KKL som togs fram för hela produktutvecklingsprocessen i början av arbetet och det uppfyllde 19 av 31 punkter. Det har också skapats en 3D-utskriven prototyp innehållande de fyra viktigaste delarna av konceptet som gav en positiv känsla av framtida användning. Arbetet anses ha givit goda resultat som är användbara vid vidare konstruktion.Eftersom arbetet endast behandlar en tidig konceptutveckling återstår konstruktions- och produktionsarbete innan en färdigställd produkt kan lanseras på marknaden. I detta arbete innefattas bland annat ingående beräkningar gällande tätning och flytkraft, fästanordning för komfortabel och säker användning, tillverkningsegenskaper samt en noggrann marknadsundersökning av efter efterfrågan på produkten och önskade funktioner produkten skulle erhålla.

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  • 170.
    Jakobsson, Joel
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Åström, Erik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Design och utveckling av ett skal till en vädersond för engångsbruk i troposfären2016Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Denna uppsats beskriver utvecklingen av ett skal till en vädersond för engångsbruk i troposfären. Syftet var att undersöka hur skalet skulle kunna utformas för att möjliggöra användning till både en radiosonde och en dropsonde, samt hur miljöpåverkan i end-of-life-fasen av produkten skulle kunna minskas. 

    Arbetets genomförande baserades på en produktutvecklingsprocess framtagen av Ulrich och Eppinger (2008). En förstudie utfördes och resulterade i en kravspecifikation som låg till grund för konceptgenereringen. Framtagna koncept utvärderades och de mest lovande testades med hjälp av fysiska prototyper och virtuella simuleringar tills en slutgiltig utformning hade fastställts. 

    Arbetet resulterade i ett cylinderformat rör av cellulosadiacetat som omsluter större delen av vädersondens kretskort och lämnar utvalda komponenter exponerade. I vardera änden av röret sitter två halvcylindriska korkar av naturlig kork som täpper igen öppningarna. En tunn skärm av cellulosadiacetat i form av en fyrdelad cirkel fästs vid cylinderns ena ände och bromsar fallet till önskad hastighet. Vid användning som dropsonde ser skärmen även till att sonden faller stabilt och i rätt orientering. 

    Miljöpåverkan i end-of-life-fasen identifierades främst som plastnedskräpning och giftiga utsläpp från de elektroniska komponenterna. Då det inte framstod som ett realistiskt alternativ att permanent kapsla in elektroniken för att förhindra utsläppet av gifter så valdes istället att motverka de långsiktiga effekterna av plastnedskräpning. Samtliga delar av skalet består därmed av biologiskt nedbrytbara material. Det konstaterades även att det finns goda utsikter för användning av biologiskt nedbrytbara skal även för sonder som används på högre altituder, och att miljöpåverkan möjligen kan minskas ytterligare genom användning av grön elektronik länge fram.

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  • 171.
    Jalkebo, Charlotte
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Placement of Controls in Construction Equipment Using Operators´Sitting Postures: Process and Recommendations2014Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    An ergonomically designed work environment may decrease work related musculoskeletal disorders, lead to less sick leaves and increase production time for operators and companies all around the world.

    Volvo Construction Equipment wants to deepen the knowledge and investigate more carefully how operators are actually sitting whilst operating the machines, how this affects placement of controls and furthermore optimize controls placements accordingly. The purpose is to enhance their product development process by suggesting guidelines for control placement with improved ergonomics based on operators’ sitting postures. The goal is to deliver a process which identifies and transfers sitting postures to RAMSIS and uses them for control placement recommendations in the cab and operator environments. Delimitations concerns: physical ergonomics, 80% usability of the resulted process on the machine types, and the level of detail for controls and their placements.

    Research, analysis, interviews, test driving of machines, video recordings of operators and the ergonomic software RAMSIS has served as base for analysis. The analysis led to (i) the conclusion that sitting postures affect optimal ergonomic placement of controls, though not ISO-standards, (ii) the conclusion that RAMSIS heavy truck postures does not seem to correspond to Volvo CE’s operators’ sitting postures and (iii) and to an advanced engineering project process suitable for all machine types and applicable in the product development process. The result can also be used for other machines than construction equipment.

    The resulted process consists of three independent sub-processes with step by step explanations and recommendations of; (i) what information that needs to be gathered, (ii) how to identify and transfer sitting postures into RAMSIS, (iii) how to use RAMSIS to create e design aid for recommended control placement. The thesis also contains additional enhancements to Volvo CE’s product development process with focus on ergonomics.

    A conclusion is that the use of motion capture could not be verified to work for Volvo Construction Equipment, though it was verified that if motion capture works, the process works. Another conclusion is that the suggested body landmarks not could be verified that they are all needed for this purpose except for those needed for control placement. Though they are based on previous sitting posture identification in vehicles and only those that also occur in RAMSIS are recommended, and therefore they can be used. This thesis also questions the most important parameters for interior vehicle design (hip- and eye locations) and suggests that shoulder locations are just as important. The thesis concluded five parameters for control categorization, and added seven categories in addition to those mentioned in the ISO-standards. Other contradictions and loopholes in the ISO-standards were identified, highlighted and discussed.

    Suggestions for improving the ergonomic analyses in RAMSIS can also be found in this report. More future research mentioned is more details on control placement as well as research regarding sitting postures are suggested. If the resulted process is delimited to concern upper body postures, other methods for posture identification may be used.

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    Placement of controls in construction equipment using operators sitting postures
  • 172.
    Johansen, Kerstin
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Öhrwall Rönnbäck, Anna
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell ekonomi. Linköpings universitet, Tekniska fakulteten.
    Flexible Automation as a Competitive Business for Manufacturing SMEs2014Ingår i: SPS2014, 2014Konferensbidrag (Refereegranskat)
  • 173.
    Johansson, Cristina
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Multiobjective Optimization for Safety and Reliability Trade-off: Applications on Early Phases of Aircraft Systems Design2017Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    A strategic issue for any industrial company is to conceive safe and reliable systems while performing all systems’ intended functions at a minimum cost. System safety and reliability are fundamental to system design and involve a quantitative assessment prior to system development. Aircraft design is a multifaceted process that involves several different disciplines, system safety and reliability among them, to obtain o holistic approach of a complex product. During the last decades, the idea of trade-off between safety or reliability goals against other characteristics has become more prominent. Furthermore, while predictions of system performance can be made in early design phases with credible precision, within reasonable tolerances, reliability and system safety are seldom predicted with high accuracy and confidence. Making the right design decisions in the early design phase is vital to the success of a project. Nowadays, it is essential within the design of new products, to increase awareness (knowledge) early in the design phases and keep the design decisions (freedom) open as long as possible, and with that also keep down the allocated costs.

    This thesis presents MOSART (Multiobjective Optimization for Safety and Reliability Trade-off), a method promoting a systematic approach regarding trade-offs between system safety and reliability goals against other contradictory targets, such as weight and cost, in early design phases.

    A theoretical framework and context are presented in the first part of the thesis, including system safety and reliability methods and optimization techniques. The second and third parts are dedicated to contributions and papers, where seven papers are included. These papers approach different aspects of MOSART, from the basic idea to the implementation and usage of the method in the conceptual phase of aircraft systems design. Several aspects regarding the choice of system safety and reliability methods in early design phases are also included in the papers, e.g. evaluation of applicability of reliability methods in early design phases, considerations around the usage of these methods within the MOSART framework and a proposal of a guideline for how to choose the right reliability method. All the examples used in the papers are chosen from basic aircraft sub-systems.

    Delarbeten
    1. On the Usage of Reliability Methods in Early Design Phases
    Öppna denna publikation i ny flik eller fönster >>On the Usage of Reliability Methods in Early Design Phases
    2012 (Engelska)Ingår i: Proceedings of the 11th International Probabilistic Safety Assessment and Management Conference and the Annual European Safety and Reliability Conference 2012 (PSAM11 ESREL 2012), Curran Associates, Inc., 2012, s. 769-778Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    One important challenge in the early phases of product development is to apply reliability methods for estimating the safety and reliability of the system when information about the chosen equipment and components is limited. For systems consisting of units with several degraded states, and not only “up” and “down”, the results from reliability and system safety analysis are often difficult to interpret and use. The main contribution of this paper is to evaluate the applicability of different reliability methods for analyzing an overall system concept in early development stages. Furthermore, the paper constitutes the first step of a methodology intended to address the issues outlined above from a practical point of view. In the paper, two static methods, Reliability Block Diagram and Fault Tree Analysis, and one dynamic method, Markov Analysis, have been applied to conceptual design of an aircraft electrical system. These three methods have been evaluated regarding usefulness, modeling possibilities and applicability in the conceptual design. Each method is, from a practical point of view, dependent on the limitations of the software that is used. In order to overcome this issue the calculations and partly the modeling have been performed in three different software tools.

    Two iterations have been performed for Markov Analysis, and the results are used to evaluate the method regarding applicability and possibilities of modeling the system and to find out what results can be gained by extending the model.

    Ort, förlag, år, upplaga, sidor
    Curran Associates, Inc., 2012
    Nyckelord
    System Reliability, Markov Analysis, Reliability Block Diagram, Fault Tree
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-94350 (URN)978-1-62276-436-5 (ISBN)
    Konferens
    11th International Probabilistic Safety Assessment and Management Conference and the Annual European Safety and Reliability Conference 2012 (PSAM11 ESREL 2012), 25-29 June, Helsinki, Finland
    Tillgänglig från: 2013-06-25 Skapad: 2013-06-25 Senast uppdaterad: 2017-02-20Bibliografiskt granskad
    2. Choosing the reliability approach: A guideline for selecting the appropriate reliability method in the design process
    Öppna denna publikation i ny flik eller fönster >>Choosing the reliability approach: A guideline for selecting the appropriate reliability method in the design process
    2013 (Engelska)Ingår i: Proceedings of the 20th Advances in Risk and Reliability Technology Symposium 21–23 May 2013 / [ed] Lisa Jackson and John Andrews, Loughborough: Loughborough University, UK , 2013, s. 366-378Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
    Abstract [en]

    The main objective of a reliability study should always be to provide information as a basis for decisions, e.g. concept choice, design requirements, investment, choice of suppliers, design changes or guaranty claims. The choice of reliability method depends on the time allocated for the reliability study, the design stage, the problem at hand and the competence and resources available.

    During a reliability study the engineer focuses on providing a graphical means of evaluating the relationships between different parts of the system, gathering or assessing the reliability data for the components and interpreting the results of the analyses. Even though the commercial software tools available claim to provide answers to most reliability questions, choosing which method is best suited is not an easy task. Often several methods can be applied and none of them will fit the purpose perfectly.

    This paper presents a guideline for choosing the best suited reliability method in early design phases from two aspects: objective and system characteristics. The methods studied are the most common methods available in commercial software tools: Reliability Block Diagram (RBD), Fault Tree (FT), Event Tree (ET), Markov Analysis (MA) and Stochastic Petri Network (SPN). The guideline considers two aspects: the characteristics of the system studied and the scope of the analysis. The applicability of each of the five chosen methods is assessed for all possible combinations of system characteristics and objective. A study has been made at Saab Aeronautics to evaluate the practical use of the analysed methods and how this guideline can improve the selection of appropriate reliability methods in early design phases.

    Ort, förlag, år, upplaga, sidor
    Loughborough: Loughborough University, UK, 2013
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-94352 (URN)9781907382611 (ISBN)
    Konferens
    The 20th Advances in Risk and Reliability Technology Symposium, 21st – 23rd May 2013, Burleigh Court Conference Centre, Loughborough, Leicestershire, UK
    Tillgänglig från: 2013-06-25 Skapad: 2013-06-25 Senast uppdaterad: 2017-02-20Bibliografiskt granskad
    3. Cost optimization with focus on reliability and system safety
    Öppna denna publikation i ny flik eller fönster >>Cost optimization with focus on reliability and system safety
    2013 (Engelska)Ingår i: Safety, Reliability and Risk AnalysisBeyond the Horizon / [ed] R. D. J. M. Steenbergen , P. H. A. J. M. van Gelder , S. Miraglia and A. C. W. M. Ton. Vrouwenvelder, CRC Press, 2013, s. 2723-2730Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    When developing a safety critical system, there are many aspects that need to be balanced against each other in order to reach an optimal design such as safety requirements, reliability goal, performance specifications and budget constraints. In an early design stage, it is vital to be able to screen the design space for a set of promising design alternatives for further studies. This paper proposes an approach capable of investigating the trade-offs described above, combining the techniques for system safety and reliability analysis with optimization methods. Markov analysis is employed for modeling the system safety and reliability characteristics and a Genetic Algorithm is used for optimization. The proposed method is applied to the design of an electric supply system for an aircraft, involving selection of components from different suppliers. First a model is built for each objective, i.e. cost, safety, and reliability. The models are validated and optimization is performed. The obtained result is the selection of suppliers for each component in the system in order to achieve a balance between system safety, reliability, and other design objectives.

    Ort, förlag, år, upplaga, sidor
    CRC Press, 2013
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-94353 (URN)10.1201/b15938-413 (DOI)9781138001237 (ISBN)9781315815596 (ISBN)
    Konferens
    ESREL2013, 29 Sep-02 October, Amsterdam, Holland
    Tillgänglig från: 2013-06-25 Skapad: 2013-06-25 Senast uppdaterad: 2017-02-20Bibliografiskt granskad
    4. An Industrial Implementation of an Optimization Based Method for Balancing Safety, Reliability and Weight of Aircraft Systems
    Öppna denna publikation i ny flik eller fönster >>An Industrial Implementation of an Optimization Based Method for Balancing Safety, Reliability and Weight of Aircraft Systems
    Visa övriga...
    2017 (Engelska)Ingår i: Risk, Reliability and Safety: Innovating Theory and Practice: Proceedings of ESREL 2016 (Glasgow, Scotland, 25-29 September 2016) / [ed] Lesley Walls, Matthew Revie and Tim Bedford, CRC Press, 2017, s. 1707-1713Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    The aim of this paper is to show how a method able of trade-offs such as system safety, reliability, weight and cost can be practically implemented in industry (SAAB Aeronautics). The scope is to facilitate the decision-making on the optimal design in early design phases. The method consists of several steps guiding the user to model each objective, verify and validate the models, perform optimization and finally visualize and select the results. Within the practical implementation of this method, several challenges are addressed and solved. For example, one challenge is to implement the trade-off method using the existing programs. Another challenge is the user friendliness of the implementation. In order to solve these challenges, the analysis is started and performed in Matlab. A Graphical User Interface guides the user to select the analysis to perform, budgets/requirements for each objective and parameters with influence on end-result. Data regarding the safety and reliability objectives, exported from Reliability Workbench program to Excel, is imported to Matlab, where the analysis is performed. The results are extracted into an Excel file, where the user can work further on visualization and selection. Two small examples are used to demonstrate this practical implementation of the trade-off method. Lessons learned are presented, strengths, limitations and development potential.

    Ort, förlag, år, upplaga, sidor
    CRC Press, 2017
    Nationell ämneskategori
    Datorsystem Inbäddad systemteknik Programvaruteknik
    Identifikatorer
    urn:nbn:se:liu:diva-134590 (URN)000414164700242 ()9781138029972 (ISBN)9781315374987 (ISBN)
    Konferens
    ESREL 2016, Glasgow, Scotland, 25-29 September 2016
    Anmärkning

    Funding agencies:The implementation presented in this paper is part of a research funded by Saab Aeronautics and the National Aviation Engineering Research Program (NFFP), jointly driven by the Swedish Armed Forces, the Swedish Defense Materiel Administration (FMV), and the Swedish Governmental Agency for Innovation Systems (VINNOVA).

    Tillgänglig från: 2017-02-20 Skapad: 2017-02-20 Senast uppdaterad: 2018-01-13Bibliografiskt granskad
    5. How to use an Optimization-based Method Capable of Balancing Safety, Reliability, and Weight in an Aircraft Design Process
    Öppna denna publikation i ny flik eller fönster >>How to use an Optimization-based Method Capable of Balancing Safety, Reliability, and Weight in an Aircraft Design Process
    2017 (Engelska)Ingår i: Nuclear engineering and technology : an international journal of the Korean Nuclear Society, ISSN 1738-5733, E-ISSN 2234-358X, Vol. 49, s. 404-410Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    In order to help decision-makers in the early design phase to improve and make more cost-efficient system safety and reliability baselines of aircraft design concepts, a method (Multi-objective Optimization for Safety and Reliability Trade-off) that is able to handle trade-offs such as system safety, system reliability, and other characteristics, for instance weight and cost, is used. Multi-objective Optimization for Safety and Reliability Trade-off has been developed and implemented at SAAB Aeronautics. The aim of this paper is to demonstrate how the implemented method might work to aid the selection of optimal design alternatives. The method is a three-step method: step 1 involves the modelling of each considered target, step 2 is optimization, and step 3 is the visualization and selection of results (results processing). The analysis is performed within Architecture Design and Preliminary Design steps, according to the company’s Product Development Process. The lessons learned regarding the use of the implemented trade-off method in the three cases are presented. The results are a handful of solutions, a basis to aid in the selection of a design alternative. While the implementation of the trade-off method is performed for companies, there is nothing to prevent adapting this method, with minimal modifications, for use in other industrial applications.

    Ort, förlag, år, upplaga, sidor
    Elsevier, 2017
    Nyckelord
    Aircraft Design, Early Design Phases, MOSART, Safety, Reliability, Trade-off
    Nationell ämneskategori
    Produktionsteknik, arbetsvetenskap och ergonomi Inbäddad systemteknik Datavetenskap (datalogi) Datorsystem Tillförlitlighets- och kvalitetsteknik
    Identifikatorer
    urn:nbn:se:liu:diva-134591 (URN)10.1016/j.net.2017.01.006 (DOI)000401102000015 ()
    Anmärkning

    Funding agencies: MOSART - Saab Aeronautics and the National Aviation Engineering Research Program [NFFP6 2013-01223]; Swedish Armed Forces; Swedish Defense Materiel Administration; Swedish Governmental Agency for Innovation Systems

    Tillgänglig från: 2017-02-20 Skapad: 2017-02-20 Senast uppdaterad: 2018-01-13Bibliografiskt granskad
    Ladda ner (pdf)
    omslag
    Ladda ner (jpg)
    presentationsbild
  • 174. Beställ onlineKöp publikationen >>
    Johansson, Cristina
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    On System Safety and Reliability Methods in Early Design Phases: Cost Fo cused Optimization Applied on Aircraft Systems2013Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    System Safety and Reliability are fundamental to system design and involve a quantitative assessment prior to system development. An accurate prediction of reliability and system safety in a new product before it is manufactured and marketed is necessary as it allows us to forecast accurately the support costs, warranty costs, spare parts requirements, etc. On the other hand, it can be argued that an accurate prediction implies knowledge about failures that is rarely there in early design phases. Furthermore, while predictions of system performance can be made with credible precision, within reasonable tolerances, reliability and system safety are seldom predicted with high accuracy and confidence.

    How well a product meets its performance requirements depends on various characteristics such as quality, reliability, availability, safety, and efficiency. But to produce a reliable product we may have to incur increased cost of design and manufacturing. Balancing such requirements, that are often contradictory, is also a necessary step in product development. This step can be performed using different optimization techniques.

    This thesis is an attempt to develop a methodology for analysis and optimization of system safety and reliability in early design phases. A theoretical framework and context are presented in the first part of the thesis, including system safety and reliability methods and optimization techniques. Each of these topics is presented in its own chapter. The second and third parts are dedicated to contributions and papers. Three papers are included in the third part; the first evaluates the applicability of reliability methods in early design phases, the second is a proposed guideline for how to choose the right reliability method, and the third suggests a method to balance the safety requirements, reliability goals, and costs.

    Delarbeten
    1. On the Usage of Reliability Methods in Early Design Phases
    Öppna denna publikation i ny flik eller fönster >>On the Usage of Reliability Methods in Early Design Phases
    2012 (Engelska)Ingår i: Proceedings of the 11th International Probabilistic Safety Assessment and Management Conference and the Annual European Safety and Reliability Conference 2012 (PSAM11 ESREL 2012), Curran Associates, Inc., 2012, s. 769-778Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    One important challenge in the early phases of product development is to apply reliability methods for estimating the safety and reliability of the system when information about the chosen equipment and components is limited. For systems consisting of units with several degraded states, and not only “up” and “down”, the results from reliability and system safety analysis are often difficult to interpret and use. The main contribution of this paper is to evaluate the applicability of different reliability methods for analyzing an overall system concept in early development stages. Furthermore, the paper constitutes the first step of a methodology intended to address the issues outlined above from a practical point of view. In the paper, two static methods, Reliability Block Diagram and Fault Tree Analysis, and one dynamic method, Markov Analysis, have been applied to conceptual design of an aircraft electrical system. These three methods have been evaluated regarding usefulness, modeling possibilities and applicability in the conceptual design. Each method is, from a practical point of view, dependent on the limitations of the software that is used. In order to overcome this issue the calculations and partly the modeling have been performed in three different software tools.

    Two iterations have been performed for Markov Analysis, and the results are used to evaluate the method regarding applicability and possibilities of modeling the system and to find out what results can be gained by extending the model.

    Ort, förlag, år, upplaga, sidor
    Curran Associates, Inc., 2012
    Nyckelord
    System Reliability, Markov Analysis, Reliability Block Diagram, Fault Tree
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-94350 (URN)978-1-62276-436-5 (ISBN)
    Konferens
    11th International Probabilistic Safety Assessment and Management Conference and the Annual European Safety and Reliability Conference 2012 (PSAM11 ESREL 2012), 25-29 June, Helsinki, Finland
    Tillgänglig från: 2013-06-25 Skapad: 2013-06-25 Senast uppdaterad: 2017-02-20Bibliografiskt granskad
    2. Choosing the reliability approach: A guideline for selecting the appropriate reliability method in the design process
    Öppna denna publikation i ny flik eller fönster >>Choosing the reliability approach: A guideline for selecting the appropriate reliability method in the design process
    2013 (Engelska)Ingår i: Proceedings of the 20th Advances in Risk and Reliability Technology Symposium 21–23 May 2013 / [ed] Lisa Jackson and John Andrews, Loughborough: Loughborough University, UK , 2013, s. 366-378Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
    Abstract [en]

    The main objective of a reliability study should always be to provide information as a basis for decisions, e.g. concept choice, design requirements, investment, choice of suppliers, design changes or guaranty claims. The choice of reliability method depends on the time allocated for the reliability study, the design stage, the problem at hand and the competence and resources available.

    During a reliability study the engineer focuses on providing a graphical means of evaluating the relationships between different parts of the system, gathering or assessing the reliability data for the components and interpreting the results of the analyses. Even though the commercial software tools available claim to provide answers to most reliability questions, choosing which method is best suited is not an easy task. Often several methods can be applied and none of them will fit the purpose perfectly.

    This paper presents a guideline for choosing the best suited reliability method in early design phases from two aspects: objective and system characteristics. The methods studied are the most common methods available in commercial software tools: Reliability Block Diagram (RBD), Fault Tree (FT), Event Tree (ET), Markov Analysis (MA) and Stochastic Petri Network (SPN). The guideline considers two aspects: the characteristics of the system studied and the scope of the analysis. The applicability of each of the five chosen methods is assessed for all possible combinations of system characteristics and objective. A study has been made at Saab Aeronautics to evaluate the practical use of the analysed methods and how this guideline can improve the selection of appropriate reliability methods in early design phases.

    Ort, förlag, år, upplaga, sidor
    Loughborough: Loughborough University, UK, 2013
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-94352 (URN)9781907382611 (ISBN)
    Konferens
    The 20th Advances in Risk and Reliability Technology Symposium, 21st – 23rd May 2013, Burleigh Court Conference Centre, Loughborough, Leicestershire, UK
    Tillgänglig från: 2013-06-25 Skapad: 2013-06-25 Senast uppdaterad: 2017-02-20Bibliografiskt granskad
    3. Cost optimization with focus on reliability and system safety
    Öppna denna publikation i ny flik eller fönster >>Cost optimization with focus on reliability and system safety
    2013 (Engelska)Ingår i: Safety, Reliability and Risk AnalysisBeyond the Horizon / [ed] R. D. J. M. Steenbergen , P. H. A. J. M. van Gelder , S. Miraglia and A. C. W. M. Ton. Vrouwenvelder, CRC Press, 2013, s. 2723-2730Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    When developing a safety critical system, there are many aspects that need to be balanced against each other in order to reach an optimal design such as safety requirements, reliability goal, performance specifications and budget constraints. In an early design stage, it is vital to be able to screen the design space for a set of promising design alternatives for further studies. This paper proposes an approach capable of investigating the trade-offs described above, combining the techniques for system safety and reliability analysis with optimization methods. Markov analysis is employed for modeling the system safety and reliability characteristics and a Genetic Algorithm is used for optimization. The proposed method is applied to the design of an electric supply system for an aircraft, involving selection of components from different suppliers. First a model is built for each objective, i.e. cost, safety, and reliability. The models are validated and optimization is performed. The obtained result is the selection of suppliers for each component in the system in order to achieve a balance between system safety, reliability, and other design objectives.

    Ort, förlag, år, upplaga, sidor
    CRC Press, 2013
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-94353 (URN)10.1201/b15938-413 (DOI)9781138001237 (ISBN)9781315815596 (ISBN)
    Konferens
    ESREL2013, 29 Sep-02 October, Amsterdam, Holland
    Tillgänglig från: 2013-06-25 Skapad: 2013-06-25 Senast uppdaterad: 2017-02-20Bibliografiskt granskad
    Ladda ner fulltext (pdf)
    On System Safety and Reliability Methods in Early Design Phases : Cost Focused Optimization Applied on Aircraft Systems
    Ladda ner (pdf)
    omslag
  • 175.
    Johansson, Cristina
    et al.
    Mendeley, Br€oderna Ugglasgatan, SE-582 54 Linköping, Sweden.
    Derelöv, Micael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    How to use an Optimization-based Method Capable of Balancing Safety, Reliability, and Weight in an Aircraft Design Process2017Ingår i: Nuclear engineering and technology : an international journal of the Korean Nuclear Society, ISSN 1738-5733, E-ISSN 2234-358X, Vol. 49, s. 404-410Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In order to help decision-makers in the early design phase to improve and make more cost-efficient system safety and reliability baselines of aircraft design concepts, a method (Multi-objective Optimization for Safety and Reliability Trade-off) that is able to handle trade-offs such as system safety, system reliability, and other characteristics, for instance weight and cost, is used. Multi-objective Optimization for Safety and Reliability Trade-off has been developed and implemented at SAAB Aeronautics. The aim of this paper is to demonstrate how the implemented method might work to aid the selection of optimal design alternatives. The method is a three-step method: step 1 involves the modelling of each considered target, step 2 is optimization, and step 3 is the visualization and selection of results (results processing). The analysis is performed within Architecture Design and Preliminary Design steps, according to the company’s Product Development Process. The lessons learned regarding the use of the implemented trade-off method in the three cases are presented. The results are a handful of solutions, a basis to aid in the selection of a design alternative. While the implementation of the trade-off method is performed for companies, there is nothing to prevent adapting this method, with minimal modifications, for use in other industrial applications.

    Ladda ner fulltext (pdf)
    fulltext
  • 176.
    Johansson, Cristina
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Derelöv, Micael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Bergström, B.
    SAAB Aeronautics, Linköping, Sweden.
    Nilsson-Sundén, H.
    SAAB Aeronautics, Linköping, Sweden.
    An Industrial Implementation of an Optimization Based Method for Balancing Safety, Reliability and Weight of Aircraft Systems2017Ingår i: Risk, Reliability and Safety: Innovating Theory and Practice: Proceedings of ESREL 2016 (Glasgow, Scotland, 25-29 September 2016) / [ed] Lesley Walls, Matthew Revie and Tim Bedford, CRC Press, 2017, s. 1707-1713Konferensbidrag (Refereegranskat)
    Abstract [en]

    The aim of this paper is to show how a method able of trade-offs such as system safety, reliability, weight and cost can be practically implemented in industry (SAAB Aeronautics). The scope is to facilitate the decision-making on the optimal design in early design phases. The method consists of several steps guiding the user to model each objective, verify and validate the models, perform optimization and finally visualize and select the results. Within the practical implementation of this method, several challenges are addressed and solved. For example, one challenge is to implement the trade-off method using the existing programs. Another challenge is the user friendliness of the implementation. In order to solve these challenges, the analysis is started and performed in Matlab. A Graphical User Interface guides the user to select the analysis to perform, budgets/requirements for each objective and parameters with influence on end-result. Data regarding the safety and reliability objectives, exported from Reliability Workbench program to Excel, is imported to Matlab, where the analysis is performed. The results are extracted into an Excel file, where the user can work further on visualization and selection. Two small examples are used to demonstrate this practical implementation of the trade-off method. Lessons learned are presented, strengths, limitations and development potential.

  • 177.
    Johansson, Cristina
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan. Saab Aeronautics, Linköping, Sweden.
    Persson, Per
    Saab Aeronautics, Linköping, Sweden.
    Derelöv, Michael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Choosing the reliability approach: A guideline for selecting the appropriate reliability method in the design process2013Ingår i: Proceedings of the 20th Advances in Risk and Reliability Technology Symposium 21–23 May 2013 / [ed] Lisa Jackson and John Andrews, Loughborough: Loughborough University, UK , 2013, s. 366-378Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The main objective of a reliability study should always be to provide information as a basis for decisions, e.g. concept choice, design requirements, investment, choice of suppliers, design changes or guaranty claims. The choice of reliability method depends on the time allocated for the reliability study, the design stage, the problem at hand and the competence and resources available.

    During a reliability study the engineer focuses on providing a graphical means of evaluating the relationships between different parts of the system, gathering or assessing the reliability data for the components and interpreting the results of the analyses. Even though the commercial software tools available claim to provide answers to most reliability questions, choosing which method is best suited is not an easy task. Often several methods can be applied and none of them will fit the purpose perfectly.

    This paper presents a guideline for choosing the best suited reliability method in early design phases from two aspects: objective and system characteristics. The methods studied are the most common methods available in commercial software tools: Reliability Block Diagram (RBD), Fault Tree (FT), Event Tree (ET), Markov Analysis (MA) and Stochastic Petri Network (SPN). The guideline considers two aspects: the characteristics of the system studied and the scope of the analysis. The applicability of each of the five chosen methods is assessed for all possible combinations of system characteristics and objective. A study has been made at Saab Aeronautics to evaluate the practical use of the analysed methods and how this guideline can improve the selection of appropriate reliability methods in early design phases.

    Ladda ner fulltext (pdf)
    Choosing the reliability approach: A guideline for selecting the appropriate reliability method in the design process
  • 178.
    Johansson, Cristina
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan. Saab Aeronautics, Linköping, Sweden.
    Persson, Per
    Saab Aeronautics, Linköping, Sweden.
    Derelöv, Michael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Cost optimization with focus on reliability and system safety2013Ingår i: Safety, Reliability and Risk AnalysisBeyond the Horizon / [ed] R. D. J. M. Steenbergen , P. H. A. J. M. van Gelder , S. Miraglia and A. C. W. M. Ton. Vrouwenvelder, CRC Press, 2013, s. 2723-2730Konferensbidrag (Refereegranskat)
    Abstract [en]

    When developing a safety critical system, there are many aspects that need to be balanced against each other in order to reach an optimal design such as safety requirements, reliability goal, performance specifications and budget constraints. In an early design stage, it is vital to be able to screen the design space for a set of promising design alternatives for further studies. This paper proposes an approach capable of investigating the trade-offs described above, combining the techniques for system safety and reliability analysis with optimization methods. Markov analysis is employed for modeling the system safety and reliability characteristics and a Genetic Algorithm is used for optimization. The proposed method is applied to the design of an electric supply system for an aircraft, involving selection of components from different suppliers. First a model is built for each objective, i.e. cost, safety, and reliability. The models are validated and optimization is performed. The obtained result is the selection of suppliers for each component in the system in order to achieve a balance between system safety, reliability, and other design objectives.

  • 179.
    Johansson, Cristina
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan. Saab Aeronautics, Linköping, Sweden.
    Persson, Per
    Saab Aeronautics, Linköping, Sweden.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    On the Usage of Reliability Methods in Early Design Phases2012Ingår i: Proceedings of the 11th International Probabilistic Safety Assessment and Management Conference and the Annual European Safety and Reliability Conference 2012 (PSAM11 ESREL 2012), Curran Associates, Inc., 2012, s. 769-778Konferensbidrag (Refereegranskat)
    Abstract [en]

    One important challenge in the early phases of product development is to apply reliability methods for estimating the safety and reliability of the system when information about the chosen equipment and components is limited. For systems consisting of units with several degraded states, and not only “up” and “down”, the results from reliability and system safety analysis are often difficult to interpret and use. The main contribution of this paper is to evaluate the applicability of different reliability methods for analyzing an overall system concept in early development stages. Furthermore, the paper constitutes the first step of a methodology intended to address the issues outlined above from a practical point of view. In the paper, two static methods, Reliability Block Diagram and Fault Tree Analysis, and one dynamic method, Markov Analysis, have been applied to conceptual design of an aircraft electrical system. These three methods have been evaluated regarding usefulness, modeling possibilities and applicability in the conceptual design. Each method is, from a practical point of view, dependent on the limitations of the software that is used. In order to overcome this issue the calculations and partly the modeling have been performed in three different software tools.

    Two iterations have been performed for Markov Analysis, and the results are used to evaluate the method regarding applicability and possibilities of modeling the system and to find out what results can be gained by extending the model.

  • 180.
    Johansson, Cristina
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Tekniska fakulteten. Saab Dynam, Linkoping, Sweden.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Derelöv, Micael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Multi-objective optimization for safety and reliability trade-off: Optimization and results processing2018Ingår i: Journal of Risk and Reliability, ISSN 1748-006X, E-ISSN 1748-0078, Vol. 232, nr 6, s. 661-676Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In early design phases, it is vital to be able to screen the design space for a set of promising design alternatives for further study. This article presents a method able to balance several objectives of different mathematical natures, with high impact on the design choices. The method (MOSART) handles multi-objective optimization for safety and reliability trade-offs. The article focuses on optimization problem approach and processing of results as a base for decision-making. The output of the optimization step is the selection of specific system elements obtaining the best balance between the targets. However, what is a good base for decision can easily transform into too much information and overloading of the decision-maker. To solve this potential issue, from a set of Pareto optimal solutions, a smaller sub-set of selected solutions are visualized and filtered out using preference levels of the objectives, yielding a solid base for decision-making and valuable information on potential solutions. Trends were observed regarding each system element and discussed while processing the results of the analysis, supporting the decision of one final best solution.

  • 181.
    Johansson, David
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Askdeponi i bergrum: Metoder för slurrytillverkning2009Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This thesis work has been carried out at the consultant company Pöyry Sweden AB in Norrköping, whom performs the task for E.ON heating Sweden AB, Händelöverket in Norrköping. The report shows methods to manufacture slurry consisting of fly ash and water. The slurry shall be pumped into several former oil storage rock shelters that E.ON has put into operation for the specific purpose. The ash mixture also develops hydrogen gas in contact with water.The work has aimed to produce different suggestions of methods and equipment that can be used for the objective. Mixing method and security issues were in centre while working with the suggestions. Parts which only indirectly are involved in the slurry manufacturing have been left out.Information has first and foremost been obtained from the Internet and company websites, but also later on through contact with salesmen and persons with knowledge in ash handling. Several references have been investigated. A close visual inspective and thought-provoking educational visit was also conducted.The results of the work are three well-tried main suggestions and one suggestion where a totally different mixing technique is used. Comparable industrial mixing activities are discussed in the beginning of the result chapter, along with some theory in three different mixing technologies. Examples of pumping equipment have also been put together.In the future a lot of work remains. An evaluation of this thesis report should be conducted before the choice of mixing method and equipment is done. Also coordination concerning all sorts of practical and technical details regarding construction work, purchasing and so on, belongs to the work that lies ahead.

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  • 182.
    Johansson, Hanna
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Sundin, Maria
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Produktutformning och materialval för formsprutning: beträffande polymera material2015Självständigt arbete på grundnivå (kandidatexamen), 12 poäng / 18 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Formsprutning är en tillverkningsmetod somställer krav på produkters utformning. För att göra en lämplig ingötsplacering räcker inte alltid riktlinjer utan en produktspecifik analys kan vara nödvändig. Materialval kräver en tydlig kravspecifikation och kan med fördel göras i samråd med en materialexpert. Riktlinjer för Design for manufacturing and assembly inkluderar bland annat rekommendationer för formgivning. Detta kandidatarbete strävar efter att hjälpa produktutvecklare att tidigt i produktutvecklingsprocessen ta hänsyn till tillverkningsaspekter. Baserat på litteraturstudier, intervjuer och fallstudier har riktlinjer tagits fram för materialval, design for manufacturing and assembly och formgivning för formsprutning. Arbetet är avgränsat till att endast titta på formsprutningsbara termoplaster. Arbetet, som genomförts vid Linköpings universitet, är en del av projektet Säkra monteringsverktyg som resulterade i ett portabelt dödmansgrepp. Defallstudier som genomfördes inom projektetbehandlar värdering av koncept utifrån produktionsperspektiv, materialval och formsprutningsanalyser i programmet Moldflow. Arbetet resulterade i riktlinjer för applicering av metoden design for manufacturing and assembly, formsprutningsanpassning samt materialval. Fallstudien i Säkra monteringsverktyg utmynnade ien värdering av koncept utifrån produktionsaspekter, ett materialval baserat på projektets kravspecifikation och rekommendationer för produktens utformning med syfte att optimera dess tillverkning. En slutsats av arbetet är att produktionsanpassning av produktens utformning bör ske tidigt i utvecklingsprocessen. En annan slutsats är att besök i industrin, hos exempelvis ett formsprutningsföretag, leder till bättre förståelse av vilka krav som behöver uppfyllas för att en produkt ska vara möjlig att producera. Om simuleringsprogram för formsprutning finns bör det användas i kombination med riktlinjer för produktutformning. Ytterligare en slutsats som gjorts är att materialval underlättas genom tidig kontakt med materialleverantörer. Materialvalet baseras på kravspecifikationen och därför bör kraven tydliggöras och dess rimlighet kontrolleras innan materialvalet sker.

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  • 183.
    Johansson, Martin
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Sundqvist, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Utveckling och design av gripdon för komposithantering2013Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Saab AB levererar lösningar, produkter och tjänster inom militärt försvar och civil säkerhet. Affärsområdet Aeronautics producerar förutom det militära stridsflygsystemet Gripen även komponenter till civila flygplan, dels sina egna men även andra flygplansproducenter som Airbus och Boeing. Projektets mål är att utveckla ett multifunktionellt robotgripdon för att undersöka automationsmöjligheter kring uppläggning av kolfiberskikt på ett plant underlag, en uppläggning som idag sker för hand. Processen som önskas automatiseras innefattar tillskärning av skikt, förflyttning från skärbord och placering på uppläggningsmall samt borttagning av skiktets skyddspapper. En systematisk konceptutvecklingsmodell har använts som grund för produktutvecklingsprocessen. Modellen har bestått av problemgranskning, undersöka ”state of the art”, upprättande av konstruktionskriterielista, nedbrytning av huvudproblemet i delproblem och framtagning av lösningar på delproblemen. Lösningarna har sedan kombinerats ihop till koncept. De genererade koncepten har utvärderats och en funktionsprototyp av det vinnande konceptet har konstruerats och testats på en robot. Prototypen är uppbyggd av aluminiumprofiler och kolfiberskikten hanteras med hjälp av vakuumsugkoppar vilkas placering anpassats efter skiktens form. Det beslutades att tillskärningen av skikten inte borde integreras i gripdonet utan lämpligast utförs av en programmerbar skärmaskin. Borttagningen av skyddspappret sker sedan i tre steg. Sedan placeras skiktet på mallen och kompakteras genom att en roller jämnar ut eventuella ojämnheter och får skiktet att fästa bättre mot underlaget. Därefter lyfter en sugkopp upp skyddspappret i det hörn som behandlats och en klo griper tag i det upplyfta hörnet varpå pappret avlägsnas. Slutsatsen är att automation av uppläggningen med hjälp av en robot är möjlig. Som fortsättning på detta projekt föreslås att en testcell byggs där automatisk uppläggning av hela processen kan testas.

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  • 184.
    Johansson, Olof
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Andersson, Henric
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Conceptual Design Using Generic Object Inheritance2008Ingår i: ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference: Volume 3: 28th Computers and Information in Engineering Conference, Parts A and B, New York: American Society of Mechanical Engineers, ASME , 2008, s. 931-941Konferensbidrag (Refereegranskat)
    Abstract [en]

    Conceptual design for complex products like aircraft and power plants requires a considerable effort since the product models become very large if they are to cover all important aspects for different stakeholders. To cope with this overall effort, designers have to rely on legacy designs and reuse, and improve the product concepts incrementally between product generations.

    This paper describes a generalized inheritance mechanism we call generic object inheritance that enables quick reuse and modification of conceptual product models at any level in their hierarchical break down structures. By facilitating reuse of conceptual models of previously well studied products, more time can be spent on developing the parts that contain the edge of a new product generation. This enables keeping the modified concepts in context of a complete analyzable product model where the impact of changes can be studied without having to maintain multiple copies of the same object structures.

    The paper describes how generic object inheritance is used for developing the next version of a conceptual product model of a small business jet, while reusing the essential parts of the previous version with minor modifications to design parameters and substructures.

    The design and core mechanisms of generic object inheritance are briefly described, and illustrated with examples from the case study.

  • 185.
    Johansson, Oskar
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Dahlgren Bjuhr, Anton
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Concept development of a fixed sonobuoy launcher: A study to examine the feasibility of applying concept development methodology to solve an industry related problem2019Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

     Is it possible to apply concept development methodology to solve a real industrial problem? This study will examine if this is possible. Saab has ordered a concept which allows launching of a sonobuoy from a pressurized aircraft cabin, this is a perfect opportunity to test this theory because it is a real system with technical demands to ensure robustness and safety. The system needs to be operated in tight areas which is the reason no launcher available will be used, they do not fulfill this demand. There are also a number of demands that the concept needs to fulfill which must be ensured during the concept process. It is not common when developing a component that a thorough and systematical concept development process is carried out at Saab. Therefor it was interesting to see how it would work with a Saab related product.

    The concept development process was carried out thoroughly by researching known methods within the subject. It was decided that the process would not follow a singular methodology because there where no process that suited this study perfectly. The process used was decided to be parts from different literature where methods that suited the concept at the current state would be used. This was performed differently depending on the current state of the concept. For example the product requirement process were established in a different way than the concept generation because they are different, one is mostly gathering facts while the other is mainly a creative phase. Regardless of the step in the concept development process the objective was to always use some sort help from the methodology.

    A combination of lacking experience with the technical area and applying concept development methodology towards a industrial problem slowed down the process. The final concept were not as developed as the plan was from the start. To perform each step required more research than what was intended and some steps became an iterative process which also took time from the actual development. However, the actual process of setting up requirements, generating ideas and evaluating concepts should also be regarded as deliverable for this study. It is material that can be used for future development and this concept where never intended to be a finished design which mean it is useful material for the future.

    To use concept development methodology for this kind of projects is recommended based on this study. Foremost when the experience of the system is limited, it ensures that the solution space and requirements are examined more than it would have without the process. It also helps with decision making and when discussing a concept within the group which could lead to an agreement which it might not would have without the methods.

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  • 186.
    Jouannet, Christopher
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik.
    Berry, Patrick
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik.
    Krus, Petter
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Aircraft design education at Linköpings University2007Ingår i: Proceedings of the Institution of Mechanical Engineers. Part G, Journal of Aerospace Engineering, ISSN 0954-4100, E-ISSN 2041-3025, ISSN 0954-4100, Vol. 221, nr 2, s. 217-224Artikel i tidskrift (Refereegranskat)
    Abstract [sv]

    Aircraft design is a complex multi-disciplinary task and teaching can easily tend to be too theoretical, not providing the students the tools they need to successfully participate in industrial projects. The approach chosen at Linköping University is intended to create the right balance between theory and practice, and to place the student in the centre of the problem, in order to achieve an overall perspective of the aircraft design process. This article presents in brief layout of the courses, and in more detail, the aircraft design project course given in the last year of the aeronautical masters program, where flying hardware is designed and build, in response to a design challenge. © IMechE 2007.

  • 187.
    Jouannet, Christopher
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik.
    Berry, Patrick
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Krus, Petter
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    MANTA - From conceptual design to flight test2005Ingår i: European Workshop on Aircraft Design Education,2005, 2005Konferensbidrag (Övrigt vetenskapligt)
  • 188.
    Jouannet, Christopher
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska högskolan.
    Berry, Patrick
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska högskolan.
    Melin, Tomas
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska högskolan.
    Amadori, Kristian
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Lundström, David
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska högskolan.
    Staack, Ingo
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska högskolan.
    Subscale flight testing used in conceptual design2012Ingår i: AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY, ISSN 1748-8842, Vol. 84, nr 3, s. 192-199Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Purpose - The purpose of this paper is to present the latest subscale demonstrator aircraft developed at Linkoping University. It has been built as part of a study initiated by the Swedish Material Board (FMV) on a Generic Future Fighter aircraft. The paper will cover different aspects of the performed work: from paper study realised by SAAB to the first flight of the scaled demonstrator. The intention of the paper is to describe what has been realised and explain how the work is may be used to fit within aircraft conceptual design. Design/methodology/approach - The approach has been to address the challenges proposed by the customer of the demonstrator, how to design, manufacture and operate a scaled demonstrator of an aircraft study in conceptual design within five months. Similar research projects have been reviewed in order to perform the current work. Findings - The results obtained so far have led to new questions. In particular, the project indicated that more research is needed within the area of subscale flight testing for usage in aircraft conceptual design, since a scaled demonstrator is likely to answer some questions but will probably open up new ones. Research limitations/implications - The current research is just in its infancy and does not bring any final conclusion but does, however, offer several guidelines for future works. Since the aircraft study was an early phase concept study, not much data are available for validation or comparison. Therefore, the paper is not presenting new methods or general conclusions. Practical implications - Results from a conceptual aircraft study and a realisation of a scaled prototype are presented, which show that scaled flight testing may be used with some restriction in conceptual design. Originality/value - The value of this paper is to show that universities can be involved in prototype development and can work in close collaboration with industries to address issues and solutions within aircraft conceptual design.

  • 189.
    Jouannet, Christopher
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik.
    Krus, Petter
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    An Empirical Model for Delta Wing Vortex Breakdown Location in Sideslip Condition2003Ingår i: AIAA Atmospheric Flight Mechanics Conference and Exhibit,2003, USA: AIAA , 2003Konferensbidrag (Refereegranskat)
  • 190.
    Jouannet, Christopher
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik.
    Krus, Petter
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Direct Simulation-Based Optimization for Aircraft Conceptual Design2007Ingår i: AIAA ATIO Conf,2007, USA: AIAA , 2007Konferensbidrag (Refereegranskat)
  • 191.
    Jouannet, Christopher
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Lift Coefficient Predictions for Delta Wing Under Pitching Motions2002Ingår i: 32nd AIAA Fluid Dynamics Conference Proceedings (2002), USA: AIAA , 2002, s. AIAA-2002-2969-Konferensbidrag (Refereegranskat)
    Abstract [en]

    An analytic prediction method is presented to estimate the lift coefficient of delta wings under pitching motions. The method is based on the leading edge suction analogy, with regards to the dynamic effect resulting in the unsteady behaviour. The goal of the method is to provide suitable lift equation for use in simulation in preliminary design.

  • 192.
    Jouannet, Christopher
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Modeling of Unsteady Aerodynamic Charactersitics of Delta Wings2002Ingår i: Proceedings 23rd International Congress of Aeronautical Sciences (ICAS), Toronto: ICAS , 2002Konferensbidrag (Refereegranskat)
    Abstract [en]

    An analytic prediction model is presented to estimate aerodynamic coefficient of delta wing undergoing dynamic motions. The model is based on the introduction of a state space variable describing the vortex breakdown. This model will be suitable for modeling of flight dynamics in the preliminary design phase.

  • 193.
    Jouannet, Christopher
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik.
    Krus, Petter
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Modelling of High Angle of Attack Aerodynamic2007Ingår i: AIAA Applied Aerodynamics Conference,2007, USA: AIAA , 2007Konferensbidrag (Refereegranskat)
  • 194.
    Jouannet, Christopher
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik.
    Krus, Petter
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Modelling of High Angle of Attack Aerodynamic, a State-Space Approach2006Ingår i: AIAA Applied Aerodynamics Conference,2006, USA: AIAA , 2006Konferensbidrag (Refereegranskat)
  • 195.
    Jouannet, Christopher
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Lundström, David
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Amadori, Kristian
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Berry, Patrick
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Design and Flight Testing of an ECO-Sport Aircraft2010Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The presented work is centered on different concept studies for “greener” sport aircraft. The goal is to show the possibility to manufacture a sport aircraft based on different environmental friendly propulsion systems. A first theoretical part consists of creating a sizing program for studying different concepts. Then the gathered knowledge will result in the realization of two flying down-scaled demonstrators. This study was realized during a student project over a 5 month period.

  • 196.
    Jouannet, Christopher
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik.
    Lundström, David
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik.
    Amadori, Kristian
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Berry, Patrick
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik.
    Design of a Very Light Jet and a Dynamically Scaled Demonstrator2008Ingår i: AIAA Aerospace Sciences Meeting and Exhibit,2008, USA: AIAA , 2008Konferensbidrag (Refereegranskat)
    Abstract [en]

      

  • 197.
    Jouannet, Christopher
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Lundström, David
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Amadori, Kristian
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Berry, Patrick
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Morphing Wing Design, from Study to Flight Test2009Konferensbidrag (Refereegranskat)
    Abstract [en]

    Mission adaptive wing have been implement in the past, this article present an approach were wingarea reduction of at least 40% has to be achieved. The project goal is to evaluate different concept bythe uses of flying demonstrators. This was realized during a student project over a five month period.

  • 198.
    Junling, Sara
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Konstruktionslösning för fartdämpande åtgärd i trafikmiljö2009Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats
    Abstract [sv]

     

    Nollvisionen innebär att ingen människa ska dödas eller skadas svårt i trafiken. Utifrån detta har riktlinjer tagits fram att fordons hastighet bör begränsas till 30 km/h där oskyddade trafikanter kan bli påkörda. Det faktum att fordon inte håller hastigheten har gett upphov till olika fartdämpande åtgärder för att tvinga förarna att sänka hastigheten och på så sätt rädda liv.

    Syftet med examensarbetet har varit att ta fram en konstruktionslösning som sänker hastigheten på fordon, uppfyller kraven som ställs och kommer till rätta med problemen som de nuvarande lösningarna har. Arbetet har utförts på teknikkonsultföretaget Prodelox AB.

    Arbetet inleddes med en litteraturstudie om vad som idag används som fartdämpande medel på de svenska vägarna, vilka lagar de behöver uppnå och vilka för- och nackdelar de har. Litteratur om metoden systematisk konceptutveckling, som har använts i projektet, har även studerats. Det är en generell produktutvecklingsmetod som lämpar sig väl på mekaniska produkter. Först bryts problemet ner och granskas, konkurrenter analyseras och en konstruktionskriterielista sammanställs. Hjälpverktyg som black-box modellen, funktions/medel-träd och brainstorming används. Flertalet koncept skapas, analyseras och gallras. Slutligen utförs en omfattande utvärdering och ett koncept väljs för vidare konstruktion.

    Vid genomförandet av metoden lades stor vikt på en inledande fas, att ta reda på kundönskemålen och strukturera dessa. En referensgrupp sattes samman med representanter från Vägverket, Statens väg- och transportforskningsinstitut samt Linköpings kommun. De fick rangordna vilka produktegenskaper som de tyckte var viktigast och resultatet infördes i en QFD-matris. Detta gav riktlinjer om att farthindret bör vara enkelt att underhålla, tåla temperaturskillnader och vara snöröjningsanpassad.

    Tidigt i utvecklingsprocessen riktades arbetet in mot dynamiska farthinder. Det bygger på att fordonens hastighet läses av och vid hastighetsöverskridelse uppstår konsekvenser, i form av t.ex. ett hinder i vägbanan. Utryckningstjänsten kan då få behörighet att passera med valfri hastighet utan att något händer och bussförare kommer få en bättre arbetsmiljö om de väljer att hålla gällande hastighet.

    Konkurrenterna på marknaden har alla haft problem med driftsäkerheten. Utmaningen blev att ta fram koncept som är lätta att underhålla och fungerar i den tuffa miljön. Fyra koncept togs fram. De påverkar föraren på olika sätt, genom avsmalning, uppskjutande hinder och justering av signaljuset. Alla koncepten utvärderades och ett valdes att arbeta vidare med. Det valda konceptet detaljkonstruerades och ingående komponenter valdes.

     

    Ladda ner fulltext (pdf)
    FULLTEXT02
  • 199.
    Karlgren Johansson, Mikael
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Leong, Kevin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Auxiliary Heater for Natural Gas Trucks2017Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    As alternative fuels are becoming more common, technologies need to adjust to them. Natural gas is one of the alternative fuels that has grown during the latest years in the transport sector. Natural gas consists of around 97 % methane and is the cleanest fossil fuel. The use of natural gas can make it easier to transition to biogas as it has equivalent properties.

    Today Scania CV AB's trucks fuelled by natural gas are using auxiliary cabin heaters driven by diesel. This means that the natural gas trucks have two fuels on-board the truck. The goal of this project is to find a concept to eliminate the diesel fuel and replace it with an auxiliary cabin heater driven by another energy source. It will improve the heating solution and make it superior from an environmental perspective.

    The result of the project lead to a short-term solution with an auxiliary heater fuelled by natural gas. A long-term solution is to have a cooperation with a manufacturer to develop a better natural gas auxiliary heater that fulfils more of the requirements in the technical specification. An experiment plan is devised to test parameters out of reach of the project. 

    Ladda ner fulltext (pdf)
    Auxiliary Heater for Natural Gas Trucks
  • 200.
    Karlsson, Ola
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    It’s unbelievable, feels like you’re diving: Potential benefits of Virtual Reality for  documentation and analysis in underwater archaeology2019Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This study examined questions around the scientific validity of using digital 3D models in underwater archaeology and the potential benefits of using virtual reality (VR) as a way of working with said models for documentation and analysis. A workshop with underwater archaeologists at the Swedish National Maritime and Transport Museums was conducted and the results indicate that depending on the research question being examined, there can indeed be validity in using digital 3D models, even if they are at a somewhat lower resolution. The results furthermore indicate that VR might give a better spatial understanding and overview of a site and provide a more familiar and intuitive interface for the archaeologists when working with the digital models. Several design openings were also identified and design suggestions for features in a potential VR tool were created.

    Ladda ner fulltext (pdf)
    Potentials of VR for documentation and analysis in underwater archaeology
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