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  • 1.
    Ahlman, Per-Arne
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Maskinkonstruktion.
    Smörjning Av Lager2009Independent thesis Basic level (university diploma), 15 poäng / 22,5 hpOppgave
    Abstract [en]

    The work thesis was performed at Assalub a company which is situated in Åtvidaberg. The company works with developing, manufacturing and marketing equipment for handling of lubricants for light and heavier industry. The work thesis it is based on a inquiry Assalub got from MacGregor which is a company within cargo solution, from port to offshore system.

    For unloading grain and other material from the ship cargo it is used combined inlet feeder and screw conveyor, there the inlet feeder is drilling down through the cargo and feed the screw conveyer with material to further destination. At the bottom of the screw conveyer and the inlet feeder there is a bearing that keep the parts together. However the lubrication of the bearing must be made manually. Until now the bearing was lubricated manually through a grease nipple from the bottom of the drill once a day.

     

    The purpose of the thesis was the construction of a lubricating system namely a pump with a grease container which should be placed inside the space of the screw conveyer, so the bearing will be continually lubricated and able to work several days without any stoppage.

    After receiving drawings and operating data for the screw conveyer, the details for the construction was designed in CAD system Solid Edge. The solid mechanics calculations on the weakest point on the construction was made by hand and afterwards the drawings for respectively details was made.

    The construction was completed, but because of the time limit for this work thesis, the manufacturing, mounting and testing were not included in these weeks. The grease containers capacity is approximately seventy-two hours, although desirable should be up to seven days. According to the solid mechanics calculations, the construction should have no problem to resist the stresses it would be exposed to.

    Since this is a prototype there is probably some adjustments and improvements to do, but the estimating is that the system should work properly as it is now.

  • 2.
    Andersson, Ann-Christine
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Kvalitetsteknik. Linköpings universitet, Tekniska högskolan.
    Olheden, Anna
    Landstinget i Kalmar län.
    Patient participation in quality improvement: managers’ opinions of patients as resources2012Inngår i: Journal of Clinical Nursing, ISSN 0962-1067, E-ISSN 1365-2702, Vol. 21, nr 23-24, s. 3590-3593Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The aim of this study was to investigate managers’ opinions of how to take advantage of patients as resources in quality improvement work in the Swedish healthcare sector.

  • 3.
    Andersson, Maria
    et al.
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik.
    Kristofferson, Hanna
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik.
    Structural Optimization of Product Families: With Application to Vehicle Body Structures2006Independent thesis Advanced level (degree of Magister), 20 poäng / 30 hpOppgave
    Abstract [en]

    Some products share one or two modules and while developing these products, structural optimization with stiffness as the objective function can be a useful tool. There might be no or very little CAD-data available in the pre-development phase and it is not certain that existing designs can be, or is desirable to use as a reference. The main objective of this thesis is to establish an accurate and fast-to-use methodology which can be utilized while developing new cars.

    In this thesis, the Volvo products S40, V50 and C70 serve as a basis for this case study. All the models are beam structures and the masses of components are added as point and line masses. Several optimization analyses are performed on one or three products exposed to seven load cases. Additional analyses with shell elements, more simplified models and changed load case balance achieved by normalization of the different load case compliances are also studied to investigate how these factors influence the results.

    Analyses show that front crash to a great extent dominates the results while normalization increases the influence of the remaining load cases. Since front crash is dominating and the front area is shared in all products, the performance is remarkably similar when three products are optimized compared to separate analyses of one product. Analysis of models without added point or line masses gives a result which greatly differs from previous results and therefore shows that added masses are required. The methodology is applicable to develop products and detect new load paths through the car.

  • 4.
    Attervall, Sebastian
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Gustafsson, Nichlas
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Styrning och nödbroms av ModuLith2008Independent thesis Advanced level (degree of Magister), 20 poäng / 30 hpOppgave
    Abstract [en]

    The purpose of this project is to get a fully functional, automatic steering system and a variable breaking system with an emergency breaking function to an off road vehicle. This off road vehicle is supposed to work as an aid in military situations. A team of two, Sebastian Attervall and Nichlas Gustafsson, got an order from Jonas Nyårds and the PreeRunners Project to construct a steering system that could manoeuvre an off road vehicle without any human involvement. To make this possible the vehicle would be guided by onboard sensors, cameras and computers. The team where also assigned to construct an automatic breaking system, there also no human would be involved. The breaking system should as well contain an emergency stop function to prevent any accidents. The team has solved the problems assigned by using theories by David G. Ullman. The system that was eventually chosen was a steering system containing a 48V, 250W DC motor. A planetary gear where chosen to increase the torque from the engine. To translate the torque from the planetary gear to the steering bar a chain with chainwheel where chosen, this because the chain and chainwheel could withstand the immense forces acting on the chain. Between the planetary gear and the chainwheel a skid clutch is placed to prevent destruction on the planetary gear due to overload. The whole steering system is monitored by two rotary encoders, one placed on the engine and one placed on the steering bar. The breaking system eventually chosen where a system build on the existing drum brakes, placed in the front. To make the system independent from any human interference a system containing a linear motor, an electromagnet and a spring where chosen. The system works by letting the spring act on the wire from the existing drum breaks. The spring is always compressed so a force will always act on the wire when the system is at rest. By compressing the spring further the force acting on the wire will decrease and by compressing it enough the breaks will be released. The force compressing the spring will come from the linear motor. And to make the system failsafe in case of an emergency an electromagnet will be placed between the linear motor and the spring. When the power is cut to the electromagnet the compressed spring will be released and the drum breaks will break. The breaking system as well will be supervised by encoders and in this case linear encoders.

  • 5.
    Axelsson, Daniel
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Design and Development of a Spray Booth2008Independent thesis Advanced level (degree of Magister), 20 poäng / 30 hpOppgave
    Abstract [en]

    As a part of a more extensive project of developing a new finishing line at the Bolivian door manufacturer Tecno Carpinteria San Pedro this thesis presents the development process for a special designed spray booth. The thesis covers every phase from a product idea to a final concept design.

    Working with finishing of furniture and other wooden products can effect the workers health in a negative way and damage the environment. The final result of the manufactured door is also depending on the how well the ventilation system in the working area is. Because of these reasons it is important to use safety equipment and a good ventilation system in the working area. As a part of this new finishing line San Pedro is in need of a special designed spray booth to control the spread of paint particles and other hazard substances that is a result of the finishing process.

    Together with the consultant firm CADEFOR a spray booth is designed and a proposal design is presented in this thesis. The result is a design built up with a dry filter solution together with an extractor that creates a cross draft airflow towards the rear part of the spray booth. The result of the project together with some recommendations of increasing the capacity in the finishing line are also presented.

  • 6.
    Berg, Kristoffer
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Lindholm, Jonas
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Vibrationsisolering av gruvmaskinshytt2007Independent thesis Advanced level (degree of Magister), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Detta examensarbete, på uppdrag av Atlas Copco Rock Drills AB, syftar till att kartlägga de problem gällande vibrationer som finns och uppstår vid användandet av produkten Scaletec MC och komma med förslag till lösningar på ett nytt system som bättre hanterar vibrationer än det befintliga. Lösningarna är avgränsade till hytten och hyttens koppling mot ramen. Kartläggningen av Scaletec MC visade att den största problemskaparen är den långa bommen med den tunga hydraulhammaren framtill. Den skapar rörelse i hytten både vid skrotning och vid transport. Vid transport är även den odämpade stolen, de ojämna vägarna och det faktum att axlarna är stela ett stort problem som genererar helkroppsvibrationer hos operatören. Konceptfasen fokuserade på att hitta en robust och kompakt konstruktion som med rätt val av frihetsgrader skulle kunna lösa de existerande problemen med vibrationer. Arbetet resulterade i två lösningar som på ett kontrollerat sätt hanterar de vibrationer som uppstår vid skrotning och transport. Det ena konceptet syftar till att åtgärda de brister dagens system besitter medan det andra även är anpassat för att hantera större vibrationsnivåer.

  • 7.
    Bergdahl, Stefan
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik.
    Undersökning av svetsförband med avseende på svetsgeometri, diskontinuiteter och blästring med stålkulor2006Independent thesis Basic level (professional degree), 20 poäng / 30 hpOppgave
    Abstract [en]

    Breakdowns of welded structures are usually a consequence of fatigue loading. Fatigue fractures are commonly initiated in the region close to the weld toe but can also initiate from the weld root and from discontinuities inside the weld. The purpose of this investigation was to examine the weld quality of welded joints produced at Volvo Wheel Loaders factory in Arvika. The goal of the investigation is to give a clearer insight regarding factors influencing the fatigue strength of the welded joints and thereby give a better foundation for fatigue strength calculations.

    The investigation is including examination of the weld geometry, weld discontinuities and the effects of shot peening. Mainly three different methods for collecting test data have been used: Plastic replicas cast on the weld profile, weld specimens from a rear frame belonging to a wheel loader of model L110E/120E and Almen testing of the shot peening.

    The results showed that it is not possible to control even transition between the weld material and the base material without after treatment. The most frequent reason why the welded joints did not fulfill the demands in the Volvo Corporate Standard was leg deviation outside the acceptable limit. The most frequent weld defect was lack of fusion inside the weld. The occurrence of this defect was overrepresented in butt welds. The results also showed that the fatigue enhancing effects of shot peening are with today’s process just being used to a minor degree.

  • 8.
    Blomqvist, Michael
    et al.
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik.
    Tunemar, Andreas
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik.
    Modernisering av ångventil: Prestandaförbättring av spindelavtätning och hydraulisk servomotor2006Independent thesis Advanced level (degree of Magister), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Examensarbetet har genomförts på Siemens Industrial Turbomachinery AB i Finspång. Arbetet innebär modernisering av ventiler till ångturbiner. Uppgiften består av två delar, där den första delen är att modernisera dagens tätningar i spindelgenomföringen. Syftet är att finna en mer vibrationstålig, driftsäker och mindre utrymmeskrävande lösning. Det andra delprojektet är att finna alternativ till dagens tallriksfjädrar i de servomotorer som reglerar ventilen. Anledningen till att nya fjädrar skall tas fram är att öka livslängden, minska slitaget och utrymmesbehovet på servomotorerna.

    För att kunna genomföra uppgiften på ett effektivt och strukturerat sätt har en metodik för systematisk konceptutvecklings används. Denna metodik har varit hjälpfull för att finna nytänkande lösningar. För att kunna dimensionera komponenterna har beräkningsmodeller tagits fram för de ångkrafter som verkar i en ångventil samt för olika typer av packboxar och fjädrar.

    Arbetet med moderniseringen av spindeltätningar har resulterat i att en ny typ av packbox har valts som minskar friktionen samt behovet av efterdragning. Två olika lösningar har tagits fram för att skapa den förspänningskraft som gör att packningen tätar. Båda lösningar minskar behovet av underhållsarbete samt underlättar monteringen. En indikation ges även när rätt kraft är uppnådd, vilket minimerar risken för läckage eller att ventilen inte går att manövrera.

    Analysen av servomotorer resulterade i att inga möjliga alternativ till tallriksfjädrar hittades. Modifieringar har därför tagits fram för att förbättra dagens tallriksfjädrar. Dessa ändringar innebär att slitaget minskas och livslängden ökas betydligt.

  • 9.
    Cronemyr, Peter
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik. Linköpings universitet, Tekniska högskolan.
    Towards a learning organization for product development2000Licentiatavhandling, monografi (Annet vitenskapelig)
    Abstract [en]

    The costs of late changes due to earlier misunderstandings in product development are very high, even though no company wants to admit how high they really are. From experience in Swedish industry and based on results from previous research found in the literature, the conclusion is drawn that people need to talk to one another to be able to understand one another and thereby avoid misunderstandings. Information technology can be used to increase the frequency and amount of information communicated within a product development organization but it cannot replace talking. This project aims at delivering methods that are intended to improve effectiveness of product development, i.e. fewer misunderstandings will contribute to improved quality and, as a consequence, lowered costs and shortened lead-times. The project also aims at delivering a method that is intended to improve organizational learning, which would in turn improve a company’s ability to adapt more easily to a changing environment. The ultimate goal and vision is more competitive companies.

    The following contributions to the theory of Engineering Management are presented in this thesis: (i) ‘An Engineering Management Model for Improvement of Organizational Learning’ is a theoretical model of how three management disciplines can be used together to improve organizational learning within a product development organization, based on the framework of Senge’s five disciplines. (ii) ‘Phantom Turbine Development’ is a presentation of how people engaged in development of technology and processes for product development can share goals and visions based on future customer needs. (iii) ‘Process Improvement Simulations’ are a method for simulating and comparing improvements to the development process before they actually take place. (iv) ‘Knowledge Overlapping Seminars (KOS)’ are a communication method for engineers in a product development team with the purpose of eliminating misunderstandings. Obstacles that occur in ‘ordinary meetings’ are avoided in a KOS.

    Action research has been used as research method. It has been performed at ABB STAL, a company developing gas and steam turbines, where the researcher of this project is employed. The approach used, collaborative action inquiry, is characterized by the researcher having an almost total identification with the activities and direction of change of the company, which is the case since the research is to a great extent based on the researcher’s own experience.

  • 10.
    Drotz, Erik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Kvalitetsteknik. Linköpings universitet, Tekniska högskolan.
    Lean in the Public Sector: Possibilities and Limitations2014Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The demands on efficiency and quality in the public sector have increased over the past few years, which have raised the need for strategies on how the public sector can be improved (Denhardt and Denhardt, 2000). Consequently, the concept of Lean production, or just Lean, have become increasingly spread, especially in health care, but also in government agencies, police, military and social services. Lean production is an integrated operational and socio-technical system with the aim of creating value and reducing waste in operations. Some research has been conducted on Lean in the public sector, but it has been too focused on the a few operational tools and results of these, and there is lack of a comprehensive critical review of Lean from a holistic perspective.

    The aim of this thesis is to increase understanding of how Lean production is used in different contexts. The thesis particularly focuses on the public sector, and investigates the possibilities and limitations of Lean production in this context. A total of seven organizations have been studied, including two manufacturing companies, three care units and two local businesses. In particular, qualitative methods have been used, along with some quantitative.

    The thesis shows several possibilities and limitations of Lean in public sector. One possibility is the improved flow orientation that reduces the lead time and efficiency in back office processes. Moreover, the new roles and responsibilities can lead to improved job characteristics for public sector employees. One limitation is that Lean is more commonly used to improve the technical quality than the functional, which means that the focus has been placed on improving the instrumental performance of the service, rather than how the service is provided. There is also often a focus on efficiency in the back office rather than the front office processes. This means that Lean initiatives may become too focused on internal efficiency and thereby miss important aspects of user perceived quality.

    Delarbeid
    1. Lean in healthcare from employees' perspectives
    Åpne denne publikasjonen i ny fane eller vindu >>Lean in healthcare from employees' perspectives
    2014 (engelsk)Inngår i: Journal of Health Organisation & Management, ISSN 1477-7266, E-ISSN 1758-7247, Vol. 28, nr 2, s. 177-95Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    PURPOSE: The purpose of this paper is to contribute toward a deeper understanding of the new roles, responsibilities, and job characteristics of employees in Lean healthcare organizations.

    DESIGN/METHODOLOGY/APPROACH: The paper is based on three cases studies of healthcare organizations that are regarded as successful examples of Lean applications in the healthcare context. Data were collected by methods including interviews, observations, and document studies.

    FINDINGS: The implementation of Lean in healthcare settings has had a great influence on the roles, responsibilities, and job characteristics of the employees. The focus has shifted from healthcare professionals, where clinical autonomy and professional skills have been the guarding principles of patient care, to process improvement and teamwork. Different job characteristics may make it difficult to implement certain Lean practices in healthcare. Teamwork and decentralization of authority are examples of Lean practices that could be considered countercultural because of the strong professional culture and uneven power distribution, with doctors as the dominant decision makers.

    PRACTICAL IMPLICATIONS: Teamwork, value flow orientation, and company-wide involvement in CI were associated with positive effects on the organizations' working environment, staff development, and organizational performance.

    ORIGINALITY/VALUE: In order to succeed with Lean healthcare, it is important to understand and recognize the differences in job characteristics between Lean manufacturing and healthcare. This paper provides insights into how Lean implementation changes the roles, responsibilities, and job characteristics of healthcare staff and the challenges and implications that may follow from this.

    sted, utgiver, år, opplag, sider
    Emerald Group Publishing Limited, 2014
    Emneord
    Lean production, healthcare, employees’ role
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-110657 (URN)10.1108/JHOM-03-2013-0066 (DOI)000209891100004 ()25065109 (PubMedID)2-s2.0-84902509126 (Scopus ID)
    Tilgjengelig fra: 2014-09-18 Laget: 2014-09-18 Sist oppdatert: 2018-03-09
    2. Lean in social services: possibilities and limitations
    Åpne denne publikasjonen i ny fane eller vindu >>Lean in social services: possibilities and limitations
    2014 (engelsk)Manuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    Purpose – With this paper we aim to explore the opportunities and limitations of implementing Lean production in the social service context.

    Methodology/approach – This paper is based on an ongoing longitudinal case study performed in the municipal social services. Several data collection methods have been used. First, we performed interviews with employees and managers in January-June 2012. Second, a questionnaire was sent out to all employees (n=303, response rate = 56%) in June - August 2013. Third, we have participated in numerous education events, improvement meetings, feedback seminars and strategic meetings. Fourth, we have studied protocols from project group meetings and other meetings that were relevant for the Lean work, as well as internal and external information about the Lean work.

    Findings – This paper shows that there are big differences on how Lean can be applied in front-office and back-offices processes. The application of Lean production have a limited value for the improvement of front-office processes that imply a high degree of service characteristics. The limitation of Lean is the absence of principles that can be used to enhance the value creation in the meeting and interaction with users. In back-office processes where service characteristics are less evident, the Lean principles are more suitable and easy to apply. By engaging employees in improvement work Lean helped the social service organization to achieve more coordinated and consistent workflows and thereby shorten handling times and reduce costs.

    Practical implications – Since Lean production was not intended to assure the functional quality of services it needs to be complemented by other improvement activities to enhance the value co-creation with the user. In respect to the current trend of greater involvement of users, citizens and the wider community in public services an important question for the social service providers is not just how to improve the organization, but how to better work with users and other involved persons.

    Originality/value – The current research on Lean in public services is limited to a number of case studies describing success stories from implementing some Lean methods and tools. In our study we take   different approach and analyze Lean production from the distinctive context and purpose of the social service. We discuss how the service characteristics and the technical and functional dimensions of service quality influenced the choice of Lean principles, methods and tools, and what implications it has for improving municipal social services.

    Emneord
    Lean production, service characteristics, public sector, social service, improvements
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-110659 (URN)
    Tilgjengelig fra: 2014-09-18 Laget: 2014-09-18 Sist oppdatert: 2015-01-19
    3. The rhetoric and reality of Lean: A multiple case study
    Åpne denne publikasjonen i ny fane eller vindu >>The rhetoric and reality of Lean: A multiple case study
    2016 (engelsk)Inngår i: Total quality management and business excellence (Online), ISSN 1478-3363, E-ISSN 1478-3371, Vol. 27, nr 3-4, s. 398-412Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    In this paper, we analyse the similarities and differences between the descriptions of Lean found in the extant literature and how it is applied in practice. Using a multiple case study with seven cases from different sectors, we offer seven propositions about Lean as applied in reality and its relation to descriptions in literature. Our results indicate that organisations adopt the general rhetoric, and repeat the message conveyed by Lean proponents, in terms of the rationale for, and expected outcomes of, applying Lean. Furthermore, we see that the decision to implement Lean often precedes the identification of problems in the organisation, which causes a risk of an unfocused change process. Lean initiatives also tend to have a rather narrow scope, which contradicts the holistic view advocated in the literature. This, together with the variation in operationalisation, makes it difficult to predict the outcomes of a Lean initiative. Our study suggests that our findings do not depend on organisation size, sector or industry.

    sted, utgiver, år, opplag, sider
    Taylor & Francis, 2016
    Emneord
    Lean, rhetoric, practice, case study, Lean, retorik, praktik, fallstudie
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-113675 (URN)10.1080/14783363.2015.1004307 (DOI)
    Tilgjengelig fra: 2015-01-27 Laget: 2015-01-27 Sist oppdatert: 2017-12-05
  • 11.
    Drotz, Erik
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Kvalitetsteknik. Linköpings universitet, Tekniska högskolan.
    Poksinska, Bozena
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Kvalitetsteknik. Linköpings universitet, Tekniska högskolan.
    Lean in healthcare from employees' perspectives2014Inngår i: Journal of Health Organisation & Management, ISSN 1477-7266, E-ISSN 1758-7247, Vol. 28, nr 2, s. 177-95Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    PURPOSE: The purpose of this paper is to contribute toward a deeper understanding of the new roles, responsibilities, and job characteristics of employees in Lean healthcare organizations.

    DESIGN/METHODOLOGY/APPROACH: The paper is based on three cases studies of healthcare organizations that are regarded as successful examples of Lean applications in the healthcare context. Data were collected by methods including interviews, observations, and document studies.

    FINDINGS: The implementation of Lean in healthcare settings has had a great influence on the roles, responsibilities, and job characteristics of the employees. The focus has shifted from healthcare professionals, where clinical autonomy and professional skills have been the guarding principles of patient care, to process improvement and teamwork. Different job characteristics may make it difficult to implement certain Lean practices in healthcare. Teamwork and decentralization of authority are examples of Lean practices that could be considered countercultural because of the strong professional culture and uneven power distribution, with doctors as the dominant decision makers.

    PRACTICAL IMPLICATIONS: Teamwork, value flow orientation, and company-wide involvement in CI were associated with positive effects on the organizations' working environment, staff development, and organizational performance.

    ORIGINALITY/VALUE: In order to succeed with Lean healthcare, it is important to understand and recognize the differences in job characteristics between Lean manufacturing and healthcare. This paper provides insights into how Lean implementation changes the roles, responsibilities, and job characteristics of healthcare staff and the challenges and implications that may follow from this.

  • 12.
    Drotz, Erik
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Kvalitetsteknik. Linköpings universitet, Tekniska högskolan.
    Poksinska, Bozena
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Kvalitetsteknik. Linköpings universitet, Tekniska högskolan.
    Lean in social services: possibilities and limitations2014Manuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    Purpose – With this paper we aim to explore the opportunities and limitations of implementing Lean production in the social service context.

    Methodology/approach – This paper is based on an ongoing longitudinal case study performed in the municipal social services. Several data collection methods have been used. First, we performed interviews with employees and managers in January-June 2012. Second, a questionnaire was sent out to all employees (n=303, response rate = 56%) in June - August 2013. Third, we have participated in numerous education events, improvement meetings, feedback seminars and strategic meetings. Fourth, we have studied protocols from project group meetings and other meetings that were relevant for the Lean work, as well as internal and external information about the Lean work.

    Findings – This paper shows that there are big differences on how Lean can be applied in front-office and back-offices processes. The application of Lean production have a limited value for the improvement of front-office processes that imply a high degree of service characteristics. The limitation of Lean is the absence of principles that can be used to enhance the value creation in the meeting and interaction with users. In back-office processes where service characteristics are less evident, the Lean principles are more suitable and easy to apply. By engaging employees in improvement work Lean helped the social service organization to achieve more coordinated and consistent workflows and thereby shorten handling times and reduce costs.

    Practical implications – Since Lean production was not intended to assure the functional quality of services it needs to be complemented by other improvement activities to enhance the value co-creation with the user. In respect to the current trend of greater involvement of users, citizens and the wider community in public services an important question for the social service providers is not just how to improve the organization, but how to better work with users and other involved persons.

    Originality/value – The current research on Lean in public services is limited to a number of case studies describing success stories from implementing some Lean methods and tools. In our study we take   different approach and analyze Lean production from the distinctive context and purpose of the social service. We discuss how the service characteristics and the technical and functional dimensions of service quality influenced the choice of Lean principles, methods and tools, and what implications it has for improving municipal social services.

  • 13.
    Ek, Jonas
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Stabilitetsanalys av stötdämparventil2007Independent thesis Advanced level (degree of Magister), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Sammanfattning

    CES-ventilen (Continuously Controlled Suspension System) används inom bilindustrin för att kontinuerligt variera stötdämparens dämpningskoefficient, en teknik som benämns semiaktiv dämpning. CES-ventilen arbetar som en tryckregulator och reglerar dämpningen genom att styra tryckfallet över ventilen. Produkten utvecklas ständigt och för att kunna förutsäga ventilens påverkan på fordonet avseende dämparkarakteristik, vibrationer och ljud är det mycket viktigt att kunna beskriva ventilens dynamiska egenskaper.

    Examensarbetet fokuserar därför på att kartlägga ventilens stabilitet och dynamik i olika arbetsmiljöer. I arbetet jämförs praktiska mätvärden från två testriggar med teoretiska beräkningar och simuleringsresultat. Modelleringsarbetet på delsystemnivå har gjorts i Matlab-Simulink och till viss del i Hopsan. En reglerteknisk linjär modell av CES-ventilen har även gjorts.

    Analysen har resulterat i att en stor del av dynamiken, ventilbetingad och testriggsbetingad kan särskiljas och förklaras vid mätning i olika testriggar. En mätmetod för objektiv bestämning av ventilens stabilitet i hela arbetsområdet har dessutom utformats och dokumenterats.

  • 14.
    Elvén, Per
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Gustafsson, Henrik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Utvärdering av mätplan, pinjong: För kortade bearbetningstider och ökade toleranser i monteringen2007Independent thesis Advanced level (degree of Magister), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Getrag All Wheel Drive i Köping tillverkar i huvudsak transmissioner till fyrhjulsdrivna bilar.

    De har sett en besparingspotential om det är möjligt att sluta tillverka ett mätplan på pinjonghuvudets ovansida, detta används för att mäta in pinjongläget vid slutmonteringen av växlarna.

    I perioder har det uppstått kassationer på grund av slipbränningar på mätplanet men en stor del av besparingen ligger i kortade bearbetningstider. En önskan har även varit att det skall gå att få en ökad toleransvidd i monteringen för att minska antalet justeringar av monterade växlar.

    För att utreda om det skulle vara möjligt att ta bort mätplanet har ett antal koncept arbetats fram för att utvärderas gentemot de kriterier som måste uppfyllas.

    Konceptet med störst potential valdes ut med hjälp av olika jämförelsemetoder.

    Studien visar att det finns en möjlighet att bestämma pinjongläget genom att mäta i dubbhålet.

    De ändringar som måste göras är:

    - Ny mätstation vid inmätning av pinjonglägesshims där tjockleken på

    pinjonghuvudet mäts.

    - Ny meshingstation där pinjongen orienteras med hjälp av ett lagrat kontrollvärde

    istället för att lokalisera med hjälp av mätplanet.

    - Ny kontrollstation för inmätning av pinjonghöjd där det måste gå att lokalisera

    växelhuset för att kompensera för lutningen på grund av att det inte går att

    mäta rakt under röraxelns centrumlinje.

    Möjligheten att helt utesluta mätmetoden bör undersökas

  • 15.
    Engström, Jon
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Kvalitetsteknik. Linköpings universitet, Tekniska högskolan.
    Elg, Mattias
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Kvalitetsteknik. Linköpings universitet, Tekniska högskolan.
    Innovating service while fighting cancer?: User involvement, motivation, and patient well-beingManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    Purpose – The purpose of this paper is to examine the motives and experiences service users have to participate in service innovation and how participation effects of the relationship with the caregiver.

    Method –Twenty-five patients agreed to participate in the project, in which they were asked to use a diary to record their reflections and ideas for innovations. Fourteen participants completed the task, and we performed additional in-depth interviews with six of these. Using the NVIO software, we applied the theoretical framework to perform a qualitative analysis of the patients’ contributions and the interviews.

    Findings – We propose a range of motives from patients being not-interested; believing that participation will give restitution; participating as a form of sociality; feeling an obligation and finally as enjoyment. As patients engaged in the service innovation initiative we also assessed the ways in which involvement may affect quality-of-life. We here use the dimensions of well-being, psychological, physical, existential and support to categorize these influences. The participation seems to have affected two of these dimensions – psychological well-being and support, more than the other two.

    Practical implications – We propose that user involvement initiatives should be evaluated not only in terms of the improvements to the service process, but also on the outcomes to the individual user. This study shows that, to the participant, involvement in service innovation is an important event in the context of the relationship with the service provider and is deeply meaning-laden. While service innovation can be a positive and transformative experience, important ethical dilemmas also emerge.

    Originality/value – Little research has been conducted into user involvement from a service users’ point of view. This article studies shows the impact user involvement has on the user and the relationship with the service provider.

  • 16.
    Eriksson, Anders
    et al.
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik.
    Knutsson, Jonas
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik.
    Konstruktion av handhållet lyftverktyg2005Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Tyngdpunkten i arbetet ligger på framtagningen av ett handhållet verktyg för hantering av papphylsor vid Stora Ensos pappersbruk i Grycksbo. Framtagningen av verktyget följer er¬hållen kunskap inom konstruktionsmetodik och syftar till att förändra dagens arbetssätt och därmed minimera risken för arbetsskador vid den manuella hanteringen av hylsorna. Studier av alternativa lösningar, som skulle kunna skapa gynnsammare förutsättningar för att uppnå målet, har också genomförts. Resultatet, med rekommendationer och underlag för fortsatt arbete, som överlämnas till företaget innehåller följande:

    - CAD-ritningar i form av en 3D-modell över framtaget verktyg.

    - Förslag på modifiering av hylshäck för en effektivare hantering.

    - Förslag på grundläggande förändringar som idag enbart tillämpas i viss utsträckning.

  • 17.
    Eriksson, Erik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Logistik- och kvalitetsutveckling. Linköpings universitet, Tekniska fakulteten.
    Stopptids- och avvikelseuppföljning vid långa takttider: Från avvikelse till införd förbättring2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    High quality within a Lean production system begins with standardised work, which creates stable processes able to generate predictable output. If nonconformity from the standard procedures occurs, routines are needed to analyse, correct and prevent the nonconformity from occurring again. In that way, the nonconformity can be a trigger for continuous improvements toward more stable processes. In takted production lines, where the operator follows a standard sequence with tasks set to be completed within the takt time, a nonconformity leads to downtime in the operator’s sequence, and no value is added. With short takt time, the nonconformity leads immediately to line stop and the nonconformity will be detected. With long takt time it is often possible to catch up in the sequence before the nonconformity stops the whole line. Thus, as a consequence the problem will be hidden.

    The aim of this study is to investigate how downtime and nonconformities can be tracked and measured in a Lean production system with long takt time, as well as investigate how this data can contribute to improvements. The study has been carried out as a case study of an assembly line at Atlas Copco Rock Drills division of Underground Rock Excavation in Örebro. Within this case study semi-structured interviews were performed to investigate needs from data collection and improvement processes. Beside the case study at Atlas Copco, external case studies have been performed to gather information about other companies’ processes. Participating companies for external case studies has been RUAG Space, AstraZeneca, Väderstad-Verken and Saab Aerostructures.

    The result of the study generated three different processes, one for collecting data about nonconformities and related downtime and two parallel processes to use the data for improvements. The data collection process shows how the downtime can be tracked to support investigated needs. The downtime data is also complemented with information about key factors that affect the accuracy of the downtime measurements. The different type of downtimes that are gathered from the process is the deviations total recovery time, recovery time affecting production and downtime for the entire production line. Together with the time measurement the nonconformities is categorised and described with attributes and text to make a thoroughly analysis possible. Analysis tools proposed for the gathered data is pareto analysis, trends, calculation of cost of poor quality and identification of areas with overcapacity. Also, the result shows how some classic TPM-indicators can be used in the analysis.

    The gathered data can then be used in two developed improvement processes, one for reactive improvements and one for proactive improvements. The reactive process aims to in a systematic manner find corrective and preventive actions for detected nonconformities with high impact on the production. The nonconformities are handled one by one like the procedure for many deviation systems for product quality assurance. The proactive improvement process focuses on patterns in historical data about major nonconformity areas. Together with high level KPI:s and SMART goals to support high level goals, the nonconformity areas helps to identify which activities to carry out in order to fulfil the goals. 

  • 18.
    Fernström, Agneta
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik.
    En gustaviansk soffas resa genom två sekel: Efterforskningar, dokumentation och restaurering av en soffa från Löfstad slott2006Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Detta examensarbete handlar om en gustaviansk soffa från Löfstad slott. Jag vill visa på alla de förändringar en stoppad möbel kan genomgå under 200 år. Vad som är original och vad som senare tillkommit. I alla dessa spår efter renoveringar kan man söka information. Jag fann stolmakarens signatur vilket gjorde det möjligt att åldersbestämma soffans stomme och jag kunde efter noggrann undersökning konstatera att soffans stoppning var betydligt mycket yngre. Syftet var också att restaurera soffan, att klä om den i ett gammalt sidentyg och förse den med nya snörmakerier. I detta arbete var jag bunden till Emilie Pipers önskemål, Löfstad slotts sista ägarinna, att den för alltid skulle se ut såsom den gjorde när hon dog 1926. Vidare redovisas resultatet av mina efterforskningar om soffans historia och dess ägare.

  • 19.
    Gavel, Hampus
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    On aircraft fuel systems: conceptual design and modeling2007Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The largest and most important fluid system in an aircraft is the fuel system. Obviously, future aircraft projects involve the design of fuel system to some degree. In this project design methodologies for aircraft fuel systems are studied, with the aim to shortening the system development time.

    This is done by means of illustrative examples of how optimization and the use of matrix methods, such as the morphological matrix, house of quality and the design structure matrix, have been developed and implemented at Saab Aerospace in the conceptual design of aircraft fuel systems. The methods introduce automation early in the development process and increase understanding of how top requirements regarding the aircraft level impact low-level engineering parameters such as pipe diameter, pump size, etc. The morphological matrix and the house of quality matrix are quantified, which opens up for use of design optimization and probabilistic design.

    The thesis also discusses a systematic approach when building a large simulation model of a fluid system where the objective is to minimize the development time by applying a strategy that enables parallel development and collaborative engineering, and also by building the model to the correct level of detail. By correct level of detail is meant the level that yields a simulation outcome that meets the stakeholders’ expectations. The experienced gained at Saab in building a simulation model, mainly from the Gripen fuel system, but also the accumulated experience from other system models, is condensed and fitted into an overall process.

    Delarbeid
    1. Conceptual Design of a New Generation JAS 39 Gripen Aircraft
    Åpne denne publikasjonen i ny fane eller vindu >>Conceptual Design of a New Generation JAS 39 Gripen Aircraft
    2006 (engelsk)Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    This paper describes the conceptual phase of a modification proposal for Saab Gripen, which aims to create the best possible basis for future aircraft development. One of the main tasks in this respect is to investigate different means to extend range. This paper describes the technical outcome from the concept generation, concept selection, and concept refinement at system and airframe level. The chosen concept involves relocation and redesign of the main landing gear. The original main landing gear bay is converted into fuel tanks. The relocation of the main gear enables a new ventral twin store carriage with supersonic jettison capability to be introduced. The concept proposal yields the following improvements:

    · Increased range due to increased fuel capability

    · Increased maximum allowed takeoff weight due to beefe d-up main gear

    · Increased weapon flexibility and capability due to introduction of two new ventral store

    · Introducing supersonic jettison capability

    The paper also includes a description of how the work is related to the overall design process in general and the conceptual phase in particular, as described in design methodology literature.

    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-12980 (URN)10.2514/6.2006-31 (DOI)
    Konferanse
    44th AIAA Aerospace Sciences Meeting and Exhibit, Reno, USA
    Tilgjengelig fra: 2008-04-01 Laget: 2008-04-01 Sist oppdatert: 2013-11-07
    2. Strategy for Modeling of large A/C fluid systems
    Åpne denne publikasjonen i ny fane eller vindu >>Strategy for Modeling of large A/C fluid systems
    Vise andre…
    2004 (engelsk)Inngår i: World Aviation Congress and Display, WAC-04, SAE Technical Paper 2004-01-3093, 2004, s. 1495-1506Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    There is an ongoing trend in the European Military a/c industry towards cooperation between nations when purchasing and between manufacturers when developing and producing a/c. Different manufacturers at different locations develop different parts or sub-systems. When using this approach a vital part of a fast and precise system evaluation is the use of simulation models. In order to stay competitive it is not only sufficient to be able to build large simulation models but also to do it fast.

    This paper describes the conclusions regarding a modelling strategy of large fluid systems drawn from the building of a simulation model of the JAS 39 Gripen fuel system. An overall process is suggested into which the activities of building a model are fitted. This is however not the main objective; it is more important to identify the different issues and activities at the engineering level. If these are properly dealt with, the model development time will be reduced, if not, the wrong model may be designed. "Wrong" here means a model that does not do the job, or solves a problem other than the one intended by the stakeholder.

    Serie
    SAE technical paper series, ISSN 0148-7191 ; 3093
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-12981 (URN)10.4271/2004-01-3093 (DOI)
    Konferanse
    World Aviation Congress and Display, WAC-04, Reno, USA
    Tilgjengelig fra: 2008-04-01 Laget: 2008-04-01 Sist oppdatert: 2014-01-21bibliografisk kontrollert
    3. An Algorithmic Morphology Matrix for Aircraft Fuel System Design
    Åpne denne publikasjonen i ny fane eller vindu >>An Algorithmic Morphology Matrix for Aircraft Fuel System Design
    2006 (engelsk)Inngår i: 25th Congress of the International Council of the Aeronautical Sciences, Hamburg, Germany, 2006, nr ICAS-2006-9.2.2Konferansepaper, Publicerat paper (Fagfellevurdert)
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-12982 (URN)
    Tilgjengelig fra: 2008-04-01 Laget: 2008-04-01 Sist oppdatert: 2009-03-02
    4. Aircraft fuel system synthesis aided by interactive morphology and optimization
    Åpne denne publikasjonen i ny fane eller vindu >>Aircraft fuel system synthesis aided by interactive morphology and optimization
    2007 (engelsk)Inngår i: 45th AIAA Aerospace Sciences Meeting and Exhibit, Reno, USA, Reno,USA: AIAA , 2007, nr AIAA-2007-0653Konferansepaper, Publicerat paper (Fagfellevurdert)
    sted, utgiver, år, opplag, sider
    Reno,USA: AIAA, 2007
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-12983 (URN)
    Tilgjengelig fra: 2008-04-01 Laget: 2008-04-01 Sist oppdatert: 2009-04-28
    5. Quantification of the Elements in the Relationship matrix: A conceptual study of Aircraft Fuel System
    Åpne denne publikasjonen i ny fane eller vindu >>Quantification of the Elements in the Relationship matrix: A conceptual study of Aircraft Fuel System
    2004 (engelsk)Inngår i: 42nd AIAA Aerospace Sciences Meeting and Exhibit, Reno, USA, paper AIAA-2004-0538, 2004, nr AIAA-2004-0538, s. 5244-5252Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    This paper describes how the framework of thc house of quality and design structure matrices are used to visualizee dependencies between top level requirements and engineering design properties. It is also discussed how quantification of the matrix elements may increase the understanding of how the top-level requirements impacts the low-level design parameters. lndeed, history has shown that overlooking combinatory effects between subsystems and night conditions may become expensive. Not only in terms of not goning getting the sizing right but more so if an entirely wrong concept is chosen.

    This paper shows a matrix technique that has successfully been used at Saab and how this technique may facilitate the cconcept evaluation process of early fuel system design.

    The matrix method aids the designer to take alk the relevant aspects into account when evaluating a design. Use of the method will also increase the understanding of what top-level requirement or combination thereof, which drives the choice of one particular concept rather than the other. The understanding of how the top-level requiremEnts impacts low level design parameters such as pump size or pipe diameter will also increse.

    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-12984 (URN)10.2514/6.2004-538 (DOI)
    Konferanse
    42nd AIAA Aerospace Sciences Meeting and Exhibit, 5-8 Januari, Reno, USA
    Tilgjengelig fra: 2008-04-01 Laget: 2008-04-01 Sist oppdatert: 2014-01-21bibliografisk kontrollert
    6. Probabilistic design in the conceptual phase of an aircraft fuel system
    Åpne denne publikasjonen i ny fane eller vindu >>Probabilistic design in the conceptual phase of an aircraft fuel system
    2005 (engelsk)Inngår i: 7th AIAA Non-Deterministic Design Forum, Austin, USA, 2005, nr AIAA-2005-2219Konferansepaper, Publicerat paper (Fagfellevurdert)
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-12985 (URN)
    Tilgjengelig fra: 2008-04-01 Laget: 2008-04-01 Sist oppdatert: 2009-03-02
    7. Optimal Conceptual Design of Aircraft Fuel Transfer Systems
    Åpne denne publikasjonen i ny fane eller vindu >>Optimal Conceptual Design of Aircraft Fuel Transfer Systems
    2006 (engelsk)Inngår i: Journal of Aircraft, ISSN 0021-8669, Vol. 43, nr 5, s. 1334-1340Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

     

    This paper describes early considerations that have to be made when designing an aircraft fuel system. Emphasis is placed on illustrating the impact of top-level aircraft requirements on low-level practicalities such as fuel system design. Choosing between concepts is one of the most critical parts of any design process. Different concepts have different advantages, and the concept that is the best choice is often dependent on the top-level requirements. This paper shows how optimization has been used successfully at Saab Aerospace as a tool that supports concept selection. The example studied is the design of a fuel transfer system for a ventral drop tank and the optimization results in different conceptual designs depending on the top-level requirements.

     

    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-12986 (URN)10.2514/1.19548 (DOI)
    Tilgjengelig fra: 2008-04-01 Laget: 2008-04-01 Sist oppdatert: 2009-03-02
    8. Fuel Transfer System in the Conceptual Design Phase
    Åpne denne publikasjonen i ny fane eller vindu >>Fuel Transfer System in the Conceptual Design Phase
    2002 (engelsk)Inngår i: SAE World Aviation congress and Display, Phoenix, USA paper 2002-01-2931, 2002, nr 2002-01-2931Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    As the time between different development projects of new aircraft (a/c) extends, experienced personnel in the field of basic a/c system design are difficult to employ when being on the onset of a new design. Further on basic a/c system design is a field neglected in literature and in the educational system.

    A text is under development that summarizes the Saab experience of the complete fuel system design with respect to the fighter a/c Viggen and Gripen, the commuter a/c 340 and 2000, the trainer a/c SK60 and also the conceptual a/c B3LA.

    This paper is an extract of this text and describe early considerations that have to be made when designing a fuel transfer system. Emphasis is put on the top requirements on a/c level.

    Serie
    SAE technical paper series, ISSN 0148-7191
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-12987 (URN)10.4271/2002-01-2931 (DOI)
    Konferanse
    SAE World Aviation congress and Display, November 5-7, Phoenix, USA
    Tilgjengelig fra: 2008-04-01 Laget: 2008-04-01 Sist oppdatert: 2014-01-21bibliografisk kontrollert
    9. Using Optimization as a Tool in Fuel System Conceptual Design
    Åpne denne publikasjonen i ny fane eller vindu >>Using Optimization as a Tool in Fuel System Conceptual Design
    2003 (engelsk)Inngår i: SAE World Aviation Congress and Display, Montreal, Canada, SAE Technical Paper 2003-01-3054, 2003, nr 2003-01-3052Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    Choosing between concepts is often the most critical part of the design process. Different concepts have different advantages and disadvantages. The concept that is the best choice is most often dependent on the top level requirements. Sometimes there may also be a trade off between concept choice and the top requirements. In aircraft (a/c) fuel system design it has often proved difficult to find the switching point where the superior concept is changed. This sometimes makes the designer conservative and leads to the selection of a concept with too high a penalty. There is also a risk for the opposite and perhaps worse scenario: That the designer strives to reduce weight and cost and therefore, accidentally, chooses an under achieving concept and thus induces large downstream cost if late redesign or retro modifications are necessary.

    This paper shows how optimization has been successfully used at Saab Aerospace as a tool that supports concept selection. The example shown is the choice of fuel transfer method for a ventral drop tank. The example also illustrates the impact of top-level requirements on low-level practicalities such as fuel system design.

    Serie
    SAE Technical Paper
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-12988 (URN)10.4271/2003-01-3054 (DOI)
    Konferanse
    SAE World Aviation Congress and Display, WAC 03, September 8-12, Montreal, Canada
    Tilgjengelig fra: 2008-04-01 Laget: 2008-04-01 Sist oppdatert: 2014-01-21bibliografisk kontrollert
    10. Modeling and Simulation of Gripen’s Fluid Power Systems
    Åpne denne publikasjonen i ny fane eller vindu >>Modeling and Simulation of Gripen’s Fluid Power Systems
    Vise andre…
    2004 (engelsk)Inngår i: Recent advances in aerospace actuation systems and components, Toulouse, France, 2004Konferansepaper, Publicerat paper (Fagfellevurdert)
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-12989 (URN)
    Tilgjengelig fra: 2008-04-01 Laget: 2008-04-01
  • 20.
    Gramstad, Lloyd
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Carl Malmsten - Centrum för träteknik & design.
    Tonala skillnader mellan en traditionell och en modern gitarrkonstruktion: En jämförelse mellan två klassiska gitarrer2007Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    During my studies to become a guitar builder at Carl Malmsten CTD, I have found an interest in the construction of the classical guitar. I am fascinated by the simplicity of its construction. A simplicity that becomes more complex when you start to study it in detail.

    In my final thesis I will not try to explain this complexity. The subject is to investigate two different principles regarding its construction. I would like to find out if the sayings concerning one of the principles will yield a guitar with greater ability to produce volume and projection.

    At a close distance the difference between the guitar’s volumes is not to speak of, but a significant difference can be seen regarding one of the guitars ability to project its sound. In their nearness tonal aspects becomes in some extent legible. Even if the two guitar’s character of sound is alike subtle tonal differences exists.

    The existing differences between the two principles of construction are regarding the two guitars that I have built. The subject for the examination is to conclude the guitar’s ability to project their sound nearby compared to at a distance.

  • 21.
    Gustavsson, Jakob
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Nosbits- och provbitssågning vid strängpressning av aluminiumprofiler: Förbättring av metod och utrustning2008Independent thesis Basic level (professional degree), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Rapporten behandlar arbetet med att göra arbetsmiljön vid en aluminiumpress säkrare. Idag sågas mindre bitar nypressad aluminiumprofil på ett sådant sätt att operatören bland annat exponeras för mycket heta spånor.

    Genom systematisk konstruktionsmetodik genererades ett antal koncept, dessa utvärderades och en detaljkonstruktion av två koncept genomfördes. Det ena av dessa två innebär att stänga av kylluften underifrån under sågningen medan det andra innebär en mekaniserad lösning med en låda på en vagn, vilken gör en operatörs närvaro onödig.

    Arbetet bedrevs på Sapa Profiler AB i Finspång och gav insikter i hur konstruktionsarbete på ett tillverkande företag kan gå till. Arbetet var mycket fritt och stort rum har lämnats för kreativa och nyskapande lösningar.

  • 22.
    Göthberg, Andreas
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik.
    Produktutveckling FLEXY byggställning2007Independent thesis Advanced level (degree of Magister), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Arbetets syfte är att förbättra byggställningen FLEXY åt Steens Mekaniska i Tidaholm AB. Detta innefattar ställningens hjul, stegramar och trappa. Gällande hjulen ingår alla dess funktioner, så som höjdjustering, lagring och låsfunktion. För stegramarna behandlar arbetet först och främst dess utseende, men berör även monteringsordning och stabilisering av ramarna då en ställning upprättas. Arbetet kring trappan är av annat slag då möjligheten att komplettera ställningen med en trappa undersöks. Något som genomsyrar hela arbetet är kravet på kompabilitet mot tidigare version av byggställningen FLEXY. För att ställningen ska vara attraktiv för samtliga köpare måste detta krav uppfyllas.

    Det är hjulet som är av störst vikt i detta projekt, därav kommer större delar av rapporten behandla hjulet och dess utvecklingsprocess.

    Förbättringsarbetet startas med att sammanställa alla krav och önskemål som finns på hjulet. De flesta kraven kommer från Arbetarskyddsstyrelsen som standardiserat många faktorer kring byggställningar. Önskemål på förbättringar har dels kommit från Steens men även från branschmänniskor som gett utvecklingsförslag. Sammanställningen av dessa egenskaper ligger till grund för allt fortsatt arbete, både under utvecklingens gång och vid utvärdering av resultatet.

    Nästa steg är att försöka hitta lösningar som tillgodoser alla krav och önskemål. De enklaste lösningarna fås genom att granska det befintliga hjulet och hitta alternativa lösningar med likartade komponenter. Problemet kan delas upp i mindre beståndsdelar och lösas var för sig. Detta förenklar arbetsgången samtidigt som oväntade koncept kan uppstå då dellösningarna kombineras ihop, detta visade sig vara en mycket framgångsrik metod i detta projekt.

    Detaljframställningen är påföljande steg i processen. Utifrån vinnande koncept skapas detaljer som tillsammans uppfyller alla nämnda önskemål. Detaljframställningen resulterar sedan i tillverkning av prototyper. Dessa utgör nästa steg i förbättringsarbetet. Med hjälp av dessa är det gångna arbetet mycket lätt att utvärdera för att sedan ge förslag på ytterliggare förbättringar då detaljen verkligen kan testas.

    Vad resulterade arbetet i för produkter?

    Hjulets höjdjustering löses med en trappetsgängad mutter. Gängan har en relativt stor stigning så justeringen blir snabb. Låsningen kring struten löstes med en spärrhake. Denna snäpper automatsikt kring struten och då hjulet ska avlägsnas öppnas haken och muttern släpper från struten. Hjulets skjuvning utförs av en vidareutvecklad trampa som förflyttar hjulet en längre strecka än tidigare.

    Utvecklingen av stegramarna resulterade i en ny design med ett kortare stegavstånd än på föregående ramar. Detta medför att stegramen i sig får användas som stege, vilket är mycket bra ur ett tillverkningsperspektiv. Stegramarna kommer att finnas i fyra olika utföranden istället för tidigare tolv. Övriga förbättringar är monteringsordningen som är mycket olik den tidigare. Ställningen är i detta utförande lättare att upprätta och därtill kan det tilläggas att vikten på stegramarna har minskats. Detta tillsammans underlättar monteringen avsevärt.

    Då stegramarnas design var färdig undersöktes möjligheterna att montera en trappa i byggställningen, något som efterfrågas av särskilda grupper av hantverkare. Arbetet lyckades och resulterade i en trapp med bra egenskaper och hög kvalitetskänsla.

  • 23.
    Hellborg, Simon
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Finite Element Simulation of Roll Forming2007Independent thesis Advanced level (degree of Magister), 20 poäng / 30 hpOppgave
    Abstract [en]

    A finite element model has been developed to simulate the forming of a channel section profile with the roll forming method. The model has been optimized to experimental results with respect to strains at the edge of the sheet and spring back of the sides of the profile. Finite element models with a coarse mesh have been compared to models with a finer mesh. The models with to fine mesh become instable and a model with a rather coarse mesh was finally chosen.

    Both the models with shell elements and the models with solid elements have been used in the simulations. The simulations with shell elements gave very good results both for the geometry shape and the strains at the edge of the sheet. The reaction forces at the tools found in the simulations was only half of the reaction forces fond in the experiments.

    The simulations with the solid element model showed very good results for the reaction forces while the geometry shape of the sheet was really bad. The spring back was much larger in the simulations than in the experiments.

    The shell element model was chosen because of the excessive spring back with the solid element model. The spring back of the sides of the sheet differs only a few percent between the simulation and the experiment results when using the shell element model. The reaction forces at the tools in the simulation are only half of the reaction forces measured in the experiments but the results from the simulations are linearly proportional to the results in the experiments. The model that finally was chosen describe both the spring back and the strains at the edge of the sheet very well. Like in the experiments there were no signs of wrinkles at the sheet in any of the simulations.

  • 24.
    Hellman, Pasi
    et al.
    Department of Production, University of Vaasa, Vaasa, Finland.
    Liu, Yang
    Department of Production, University of Vaasa, Vaasa, Finland.
    Development of Quality Management Systems: How Have Disruptive Technological Innovations in Quality Management Affected Organizations?2013Inngår i: Quality Innovation Prosperity, ISSN 1335-1745, E-ISSN 1338-984X, Vol. 17, nr 1, s. 104-119Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This research investigates the history of quality and development of quality management systems. History of quality is investigated from Hammurabi’s law all the way to today’s reigning quality initiatives including ISO, Six Sigma and Lean manufacturing. In the last chapters the current state of quality management is being examined. The foresight method is also opened up and examined. The Innovator’s dilemma concept, originally presented by Clayton Christensen, is used to analyse how quality management systems have been evolved in the last 100 years. Special emphasis is placed on the US manufacturing in the 1970s and 1980s. Based on the literature, the concept of Innovator’s dilemma and the fall of US manufacturing are merged. The result is a prime example that the Innovator’s Dilemma is a universal phenomenon. The industry leader is trying to maintain its position and do everything right but still it is destined to fail. The causes and effects are being discussed in later chapters.

  • 25.
    Hermans, Johanna
    et al.
    Department of Production, University of Vaasa, Vaasa, Finland.
    Liu, Yang
    Department of Production, University of Vaasa, Vaasa, Finland.
    Quality management in the new product development: A PPAP approach2013Inngår i: Quality Innovation Prosperity, ISSN 1335-1745, E-ISSN 1338-984X, Vol. 17, nr 2, s. 37-51Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The purpose of this paper is to test Production Part Approval Process (PPAP) as a tool to build quality into the new product and processes and ensure that it meets the customer expectations. Research method is qualitative method using so called case-study to study the suitability of PPAP as a tool for quality management by building quality right into the new product and process. The case studies have been made with three different kinds of companies. PPAP is suitable tool for quality management in NPD processes when taking into account many requirements about personnel, processes, documentation etc. The paper has some limitations such as limited sample size. The results are encouraging managers to use PPAP as a tool for managing their company’s product development processes, quality work and supply chain partnerships. The manner in which the stakeholders could use to facilitate a sense of partnerships or co-workers aiming the same goals rather than have a traditional customer-seller relationship was valued in this study.

  • 26.
    Holmqvist, Andreas
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Larsson, Stefan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Konstruktionsprinciper för svetsad 25 MPa hydraulisk cylinder2007Independent thesis Advanced level (degree of Master (One Year)), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Utvecklingsavdelningen för hydraulcylindrar på Bosch Rexroth AB har identifierat ett marknadssegment för en lågpriscylinder som kan arbeta med högt tryck. Företaget har idag en lågpriscylinder på marknaden och vill vidareutveckla denna för att klara högre tryck. Detta examensarbete har utförts som en förstudie med syftet att presentera olika konstruktionslösningar av nuvarande cylinders ingående delar, för att erhålla de önskade egenskaperna. Arbetet började med att ingående bryta ner den nuvarande cylindern i mindre delar för analys. Det gjordes även en studie av konkurrenterna och vad deras sortiment har att erbjuda. I studien framkom att den sökta typen av cylinder redan idag finns på marknaden, vilket tyder på att efterfrågan finns samt att målet med utvecklingsprojektet inte är orealistiskt. När förståelsen av problembilden blivit klar kunde ett antal kritiska områden preciseras. För att få fler infallsvinklar om hur problemen kan behandlas, utfördes litteraturstudier. Litteraturstudierna resulterade i flera olika beräkningsteorier att använda. Teorierna utvärderades och applicerades sedan på de kritiska områdena. Ett flertal koncept att lösa problemen genererades fram och utvärderades mot de konstruktionskriterier som tidigt i utvecklingsarbetet hade identifierats. Trovärdigheten i de beräknade koncepten granskades sedan med hjälp av praktiska tester i företagets laboratorium. Slutligen kunde rekommenderade lösningar till företaget presenteras. Beräkningarna visar att förändringar behöver göras i cylindern. Godstjockleken i cylinderröret bör ökas för att klara det högre trycket. Även dimensionerna i framgavel och i bakgavel ökas för att erhålla en mer robust cylinder. Gängförband mellan kolv och kolvstång modifieras för att motstå den ökade spänningen som uppstår på grund av högre tryck. För att säkerställa att modifieringarna är tillräckliga måste fler prover utföras.

  • 27.
    Höglund, Kristofer
    Linköpings universitet, Institutionen för systemteknik, Datorseende. Linköpings universitet, Tekniska högskolan.
    Non-destructive Testing Using Thermographic Image Processing2013Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In certain industries, quality testing is crucial, to make sure that the components being manufactured do not contain any defects. One method to detect these defects is to heat the specimen being inspected and then to study the cooling process using infrared thermography. The explorations of non-destructive testing using thermography is at an early stage and therefore the purpose of this thesis is to analyse some of the existing techniques and to propose improvements.

    A test specimen containing several different defects was designed specifically for this thesis. A flash lamp was used to heat the specimen and a high-speed infrared camera was used to study both the spatial and temporal features of the cooling process. An algorithm was implemented to detect anomalies and different parameter settings were evaluated. The results show that the proposed method is successful at finding the searched for defects, and also outperforms one of the old methods.

  • 28.
    Imeri, Shpend
    et al.
    High Level Training Institute, Macedonia.
    Shahzad, Khuram
    University of Vaasa, Faculty of Technology (Production Department), Finland.
    Takala, Josu
    University of Vaasa, Faculty of Technology (Production Department), Finland.
    Liu, Yang
    University of Vaasa, Faculty of Technology (Production Department), Finland.
    Sillanpää, Ilkka
    University of Vaasa, Faculty of Business Studies (Management Department), Finland.
    Ali, Tahir
    University of Vaasa, Faculty of Business Studies (International Business), Finland.
    Evaluation And Selection Process of Suppliers Through Analytical Framework: An Emprical Evidence of Evaluation Tool2015Inngår i: Management and Production Engineering Review, ISSN 2080-8208, E-ISSN 2082-1344, Vol. 6, nr 3, s. 10-20Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The supplier selection process is very important to companies as selecting the right suppliers that fit companies strategy needs brings drastic savings. Therefore, this paper seeks to address the key area of supplies evaluation from the supplier review perspective. The purpose was to identify the most important criteria for suppliers’ evaluation and develop evaluation tool based on surveyed criteria. The research was conducted through structured questionnaire and the sample focused on small to medium sized companies (SMEs) in Greece. In total eighty companies participated in the survey answering the full questionnaire which consisted of questions whether these companies utilize some suppliers’ evaluation criteria and what criteria if any is applied. The main statistical instrument used in the study is Principal Component Analysis (PCA). Thus, the research has shown that the main criteria are: the attitude of the vendor towards the customer, supplier delivery time, product quality and price. Conclusions are made on the suitability and usefulness of suppliers’ evaluation criteria and in way they are applied in enterprises.

  • 29.
    Jansson, Simon
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap.
    Strok, Markus
    Linköpings universitet, Institutionen för teknik och naturvetenskap.
    Virtuellt byggande2008Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Kostnaderna att bygga blir allt högre, man tror att byggkostnaderna väntas öka med 25 procent inom de närmaste tre åren. Mest stiger byggherrekostnaden och kostnaderna för byggmaterial och inget tyder på att detta kommer mattas av. Därför ligger det på byggföretagen att effektivisera och optimera projekteringen för att sänka kostnaderna. För att sänka produktions- och projekteringskostnaderna vill byggbranschen gå från hanteringen av traditionella 2D-ritningar till intelligenta 3D-modeller, BIM – Byggnads Informations Modell.

    BIM är en metod för att lagra komplett information om en byggnad i en datormodell. Modellen integrerar all geometrisk modellinformation, de funktionella kraven och möjligheterna samt uppförandeinformationen i en enda beskrivning av ett byggnadsprojekt sett över dess livscykel.

    Vid arbete med ett BIM-projekt använder man en delad projektmodell som alla inblandade parter kan ta del av och jobba med. Med hjälp av denna BIM-baserade arbetsmetod arbetar bland annat byggnadskonstruktörer, vvskonstruktörer, elkonstruktörer och fastighetsförvaltare med samma modell som arkitekten.

    En av de största fördelarna med att använda BIM vid projekteringen är enkelheten att ändra objekt och dess egenskaper. Eftersom alla i projekteringen jobbar med samma modell av byggnaden ser respektive projektör ändringen. Det man strävar efter är att alla inblandade parter skall jobba med modellen från en gemensam server, för att kunna optimera projekteringen med avseende på tid, åtkomst av ritningar och förenklad korrespondens.

    Syftet med vårt examensarbete är att skaffa fördjupad kunskap om BIM, både teoretiskt och praktiskt. Den praktiska delen bestod i att konstruera en BIM-modell av en byggnad. De tillämpningar vi gjort på modellen är en mängdberäkning som vi utfört i ArchiCAD, och en energiberäkning i tilläggsprogrammet Vipweb.

  • 30.
    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 Process2017Inngår i: Nuclear engineering and technology : an international journal of the Korean Nuclear Society, ISSN 1738-5733, E-ISSN 2234-358X, Vol. 49, s. 404-410Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 31.
    Johansson, Daniel
    et al.
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik.
    Ahlström, Fabian
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik.
    Rörsvetsning i konceptet Factory-in-a-Box2006Independent thesis Advanced level (degree of Magister), 20 poäng / 30 hpOppgave
    Abstract [en]

    This Master of Science thesis was a part of Pharmadule Emtungas project to construct a mobile automated cell for welding of carbon steel pipe (Heating, Ventilation and Sanitation). Pharmadule Emtunga is using a modular building concept for building pharmaceutical factories. The modules contain these pipes. The goal of the thesis was to present concepts for technical solutions regarding welding methods and fixtures for the cell. Conceptual models for the cell were made with aid of CAD software. A concept generation/evaluation resulted in the winning concept; orbital welding using V-stands as fixture method. The main purpose of the fixture is to offer fast and accurate alignment of pipes, with arbitrary lengths and fittings. The fixture was made after a thorough evaluation of data concerning geometries and occurrences of pipes in a typical pharmaceutical factory.

    A number of efficiency problems concerning welding were identified during the project. The thesis presents a four-step process for increased productivity of welding in workshop as well as in the automated cell:

    1. Change payment routines so that Pharmadule Emtunga does not pay for so called “double welds”, welds that never is carried out.

    2. Update lists of time basis used for billing so that they represent actual time needed.

    3. Increase productivity in welding by obtaining an automated welding cell with work and fixturing as proposed in this thesis.

    4. Increase productivity by introducing orbital welding in the cell.

    Additional work with efficiency should be performed in connection with the execution of these four steps:

    • Possibilities of parallel work in the cell should be investigated.

    • Construction personnel need to work by the “Design for Manufacturing” (DFM) principle.

    • Single-module production would contribute to steady flow through the cell.

    • Better drawing data may increase number of welds performed in workshop.

  • 32.
    Johansson, Elisabeth
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Logistik- och kvalitetsutveckling. Linköpings universitet, Tekniska fakulteten.
    Understanding Solution Quality2016Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The integration of services and products into solutions can open up new business opportunities for firms. This thesis concerns how firms can provide solutions that are perceived as high quality. Solutions are often provided over several years, which implies a changed customer relationship compared to product provisions. Since the solution aims to support the customer’s activities, firms face new challenges when introducing solutions. One challenge is to integrate all components and activities of the solution, and simultaneously support the customer’s activities. In addition, the firm must ensure that the solution and all of its parts are of high quality.

    Most of the existing research on quality is related to the management of a firm’s internal activities and the interaction during exchange. Within the research on quality, customer orientation means that a firm should manage the relevant product or service to meet customer requirements. When this is achieved, the product or service is of high quality. Since solutions are seen as services and products that are integrated as an outcome, as well as a customer relational process that aims to support the customer’s activities, firms have little to learn from previous research about the quality of solutions.

    The aim of this thesis is to increase knowledge about how to manage solution quality. The thesis combines insights from research on quality with research on solutions and servitization. Three research questions are answered. The first question concerns the content of solution quality; the second deals with how firms can, with support from interventions, meet the new challenges that arise from solution provision; and the third question concerns how customers can be involved to achieve solution quality. The research questions are answered through five papers based on literature studies and empirical data. The papers contribute to an increased knowledge of solution quality and how firms can work to achieve it.

    The results of the thesis suggest that solution quality is built on seven quality dimensions: reliability, communicability, internal consistency, empathy, approachability, tangibility, and adaptability. In addition, knowledge of processes and customer relationships are two prerequisites for the concept. These dimensions and prerequisites are supported by interventions that can provide a change. However, it has become evident that whatever intervention is used must be related to the dimensions that are supposed to be improved. Furthermore, customer involvement is argued to be an intervention to support the prerequisites for solution quality, especially during the solution  development. The results of this thesis extend the research on quality by increasing the knowledge of the solution quality concept and by changing the view of customers and their involvement during solution development.

    Delarbeid
    1. Changing quality initiative - does the quality profile really change?
    Åpne denne publikasjonen i ny fane eller vindu >>Changing quality initiative - does the quality profile really change?
    2013 (engelsk)Inngår i: Total Quality Management and Business Excellence, ISSN 1478-3363, E-ISSN 1478-3371, Vol. 24, nr 1, s. 79-90Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    A firm working with quality management over time may change from total quality management to Six Sigma to lean production, but does this actually change the firm's quality profile? This paper seeks to identify specific quality profiles in service firms and how these profiles change over time. The empirical investigation is based on self-assessment studies conducted in 138 Swedish service firms. The results show that service firms often build up a specific quality profile, which they retain over time. The paper develops theoretical and managerial implications based on the research.

    sted, utgiver, år, opplag, sider
    Routledge, 2013
    Emneord
    quality management; quality profile; quality principles; change management
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-89629 (URN)10.1080/14783363.2012.707868 (DOI)000327929600006 ()
    Tilgjengelig fra: 2013-02-28 Laget: 2013-02-28 Sist oppdatert: 2017-12-06
    2. Using interventions to change the quality profile of an organisation
    Åpne denne publikasjonen i ny fane eller vindu >>Using interventions to change the quality profile of an organisation
    2013 (engelsk)Inngår i: International Journal of Quality and Service Sciences, ISSN 1756-669X, E-ISSN 1756-6703, Vol. 5, nr 1, s. 32-45Artikkel i tidsskrift (Annet vitenskapelig) Published
    Abstract [en]

    Purpose − The purpose of the present study is to investigate how a quality profile can evolve over time and, in particular, how different kinds of interventions can further develop or change an existing quality profile.

    Methodology/approach − Data was collected over a five-year period, including a literature review, interviews, a document study and observations to capture the quality profile and associated interventions. The study was carried out in a service organisation in the public sector.

    Findings − This study shows that the quality profile can change over time due to the use of specific interventions. If a company wants to emphasise a specific quality principle, it must target the quality principle with one or moreinterventions. However, even if a quality principle is targeted, there is no guarantee that the quality principle will show improvement in the quality profile. Also, One main finding is that the quality profile becomes more even over time due to the internal consistency of the quality principles.

    Research limitations/implications − This paper sheds light on the need to study the adoption of individual quality principles and the evolution of the quality profile of an organisation.

    Practical implications − The results can provide insights for organisations aiming to embark on a quality programme, specifically how to design and develop a quality profile.

    Originality/value − This research implies that the quality profile is a recurring, general phenomenon in all quality management improvement programmes. In other words, successful implementation of quality management requires a cohesive quality profile.

    sted, utgiver, år, opplag, sider
    Emerald Group Publishing Limited, 2013
    Emneord
    Quality management, Quality principles, Quality profile, Service organisations
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-88729 (URN)10.1108/17566691311316239 (DOI)
    Tilgjengelig fra: 2013-02-15 Laget: 2013-02-15 Sist oppdatert: 2017-12-06bibliografisk kontrollert
  • 33.
    Johansson, Mattias
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Elvebäck, Mikael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Omkonstruktion av krankonsol: Materialbyte, dimensionering samt anpassning för ökat utnyttjande av robotsvetsning2008Independent thesis Basic level (professional degree), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Sammanfattning

    Omkonstruktion av krankonsol

    Den primära uppgiften i detta arbete har varit att dimensionera om en krankonsol samt att modifiera den robotfixtur som finns för att kunna utnyttja roboten på ett effektivare sätt. I nuläget svetsas fyra utav balkens sex delar av roboten, förhoppningen är att alla delar skall kunna svetsas på samma gång. Idag punktsvetsas även konsolbenen ihop för hand innan robotsvetsningen, det vore önskvärt att roboten kunde ta hand om det också. Den andra uppgiften är att se ifall det går att genomföra ett materialbyte för att på så sätt minska konsolens vikt samt öka dess lastförmåga.

    Genom användandet av konstruktionsmetoder som till exempel QFD-hus (Quality Function Deployment) har ett antal koncept arbetats fram. Dessa har sedan utvärderats genom att undersöka hur väl de uppfyller de krav som ställts på fixturen. Resultatet av detta arbete har blivit en fixtur där roboten svetsar samtliga delar men i detta fall måste punktsvetsningen fortfarande göras i förväg. Samt ytterligare ett förslag på fixtur där punktsvetsningen inte är nödvändig, men denna fixtur har en begränsning i och med att bakre gaveln ej kan svetsas i robotcellen.

    Dimensioneringen har skett genom traditionell hållfasthetsberäkning med avseende på böjning samt vridning av konsolen. Av dessa beräkningar har resultatet blivit att det finns ett flertal olika sätt att dimensionera om konsolen. Man kan behålla det nuvarande materialet och ändå minska godstjockleken på konsolbenen, alternativt kan man genomföra materialbytet och då öka konsolens lastförmåga samt minska dess vikt.

  • 34.
    Karlsson, Tobias
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Optimal Enclosure Doors - Design and Evaluation2008Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Within the telecommunication business there are a lot of different hardware designs made for outside locations. Many of these outdoor products contain sensitive electronic equipment and all of these designs must be able to function in extreme environments. They might be mounted on the ground, on a wall or on masts at varying altitudes. They need to be enclosed and protected against blizzards, moisture, sandstorms, earthquakes, dust and similar contaminations or nature phenomena in order to assure a reliable and proper function of the device.

    To delimit this thesis the focus is completely set on outdoor enclosures with hinged doors. The sealing solution for the enclosure door is crucial because it is the weakest link in the environmental protection. The aim with this thesis is to find a robust yet versatile sealing solution for Ericsson outdoor cabinets.

    The sealing solution does not only concern the gasket design, it is in fact the entire principle when it comes to seal the door. Interesting features are choice of locking system, the positions of the hinges and other details which might affect the sealing of the enclosure door.

    The project includes the whole product development process from pre-study to concept development and evaluation of proposal design. The pre-study contain extensive literature research, benchmark and a state of the art investigation. A number of concepts are generated, screened, compared and ranked with systematic concept development methods. At last, one final concept is selected for further development. The chosen sealing solution is refined and a functional model is made. A simple prototype of the sealing solution is designed, manufactured and tested to validate the functionality of the concept.

    An economical analysis is performed in order to approximate the manufacturing cost of the gasket proposed in the sealing solution and to compare the unit price for different batch sizes. The water intrusion test indicates that the solution seems promising and that the result is a simple and robust sealing solution that easily can be implemented on various enclosure types.

  • 35.
    Koch, Christian
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Carl Malmsten - furniture studies.
    Trappetrinnets profil: En studie av alternative profiler på trappetrinnet2009Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [no]

    Mitt eksamensarbeid på Carl Malmsten Furniture Studies tar for seg en problemstilling om hvorvidt dagens profil på trappetrinnet er optimal, ut fra krav om at trappen skal være sikker, komfortabel og lite anstrengende å gå i. Det omhandler kun trapper i tre for innendørs bruk, og faktorer som produksjonsvennlighet og økonomiske aspekter er ikke tatt hensyn til.

    Interessen for temaet ble skapt under min praksisperiode hos snekkerverkstedet ”Studio Furniture Maui”, hvor man hadde spesialisert seg på å bygge trapper.

    Etter å ha søkt etter erfaringer om emnet hos bransjen og på internett, gikk det klart frem at dette var et lite utforsket tema. Jeg definerte tre punkter som jeg mente var viktige for et bedre trinn. Det skulle være sikkert, komfortabelt og lite anstrengende å gå på.

    I samarbeid med Kjell Ohlsson, professor i ergonometri på Linköpings universitet, arbeidet jeg frem fire alternativer som jeg ville teste i tillegg til det vanlige trappetrinnet. Disse profilene ble så testet av en testgruppe på 40 personer. Utfallet av denne testen viste at majoriteten av testpersonene foretrakk en av de alternative profilene fremfor det vanlige trappetrinnet.

    Basert på resultatet av testen har jeg i denne rapporten konkludert med at dagens profil på trappetrinnet ikke er optimal, og at temaet burde studeres nærmere.

  • 36.
    Kurilova-Palisaitiene, Jelena
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska fakulteten.
    Lean Remanufacturing: Reducing Process Lead Time2018Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Remanufacturing is a product recovery option in which used products are brought back into useful life. While the remanufacturing industry stretches from heavy machinery to automotive parts, furniture, and IT sectors, it faces challenges. A majority of these challenges originate from the remanufacturing characteristics of having little control over the core (the used product or its part), high product variation, low product volumes, and a high proportion of manual work, when compared to manufacturing. Some remanufacturing challenges appear to be process challenges that prolong process lead time, making remanufacturing process inefficient.

    Lean is an improvement strategy with roots in the manufacturing industry. Lean helps to increase customer satisfaction, reduce costs, and improve company’s performance in delivery, quality, inventory, morale, safety, and other areas. Lean encompasses principles, tools and practices to deal with e.g. inefficient processes and long process lead times. Therefore, in this thesis lean has been selected as an improvement strategy to deal with long remanufacturing process lead times.

    The objective of this thesis is to expand knowledge on how lean can reduce remanufacturing process lead time. This objective is approached through literature studies and a case study conducted at four remanufacturing companies. There are five challenges that contribute to long process lead time: unpredictable core quality, quantity, and timing; weak collaboration, information exchange, and miscommunication; high inventory levels; unknown number of required operations in process and process sequence; and insufficient employee skills for process and product upgrade. When analysing the case companies’ process lead times it was found that there is a need to reduce waiting times, which account for 95 to 99 per cent of process lead times at three of the four companies.

    To improve remanufacturing process efficiency and reduce remanufacturing process lead time six lean practices are suggested: product families; kanban; layout for continuous flow; cross functional teams; standard operating procedures; and supplier partnerships. The suggested lean practices have a key focus on reducing waiting time since it prolongs the process lead time. This thesis contributes to lean remanufacturing research with the case study findings on lean practices to reduce remanufacturing process lead time and increase process efficiency.

    Delarbeid
    1. Challenges and Opportunities of Lean Remanufacturing
    Åpne denne publikasjonen i ny fane eller vindu >>Challenges and Opportunities of Lean Remanufacturing
    2014 (engelsk)Inngår i: International Journal of Automation Technology, ISSN 1881-7629, E-ISSN 1883-8022, Vol. 8, nr 5, s. 644-652Artikkel, forskningsoversikt (Fagfellevurdert) Published
    Abstract [en]

    Lean philosophy, which promotes business excellence through continuous improvement, originates from the Japanese car manufacturer, Toyota’s Production System (TPS). An area where lean has not been fully explored is remanufacturing, a process that brings used products back to useful life. Remanufacturing is often a more complex process than manufacturing due to the uncertainty of process steps/time and part quality/quantity. This study explored remanufacturing by identifying its challenges and opportunities in becoming lean. The challenges of a lean remanufacturing system do not exceed its advantages. Although some researchers state that it is difficult or even impossible to apply lean principles to remanufacturing, this research utilizes lean as a continuous improvement philosophy that focuses on improving the remanufactured products’ quality, process lead times, and inventory levels. 

    sted, utgiver, år, opplag, sider
    Fuji Technology Press, 2014
    Emneord
    lean, remanufacturing, product life cycle, continuous improvement
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-120764 (URN)
    Prosjekter
    ÅterProdukt, KEAP
    Forskningsfinansiär
    VINNOVA
    Tilgjengelig fra: 2015-08-24 Laget: 2015-08-24 Sist oppdatert: 2018-05-17bibliografisk kontrollert
    2. Minimum Time for Material and Information Flows Analysis at a Forklift Truck Remanufacturer
    Åpne denne publikasjonen i ny fane eller vindu >>Minimum Time for Material and Information Flows Analysis at a Forklift Truck Remanufacturer
    2014 (engelsk)Inngår i: Proceedings of Sixth Swedish Production Symposium (SPS14), 2014Konferansepaper, Publicerat paper (Annet vitenskapelig)
    Abstract [en]

    Material and information flows are often complex at remanufacturing companies. Minimum time for Material and Information Flows Analysis (MiniMifa) is a data collection workshop in which material and information flows’ challenges and improvement opportunities are investigated. By carrying the idea of Value Stream Mapping (VSM), MiniMifa turns to an act of cartography of industrial processes. After the workshop, companies have a holistic view of their processes, the current “pains” - challenges, and possible “painkillers” – improvement ideas, including lean-inspired solutions.

    This paper demonstrates a pilot MiniMifa at a forklift truck remanufacturer where a potential improvement in e.g. lead time reduction by 93% was discovered.

    Emneord
    Remanufacturing, Lean, Material and Information Flows, Data collection workshop, Process map
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-118270 (URN)
    Konferanse
    Sixth Swedish Production Symposium (SPS14), September 16-18, 2014, Gothenburg, Sweden
    Tilgjengelig fra: 2015-05-25 Laget: 2015-05-25 Sist oppdatert: 2018-05-17bibliografisk kontrollert
    3. Toward Pull Remanufacturing: A Case Study on Material and Information Flow Uncertainties at a German Engine Remanufacturer
    Åpne denne publikasjonen i ny fane eller vindu >>Toward Pull Remanufacturing: A Case Study on Material and Information Flow Uncertainties at a German Engine Remanufacturer
    2015 (engelsk)Inngår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 26, s. 270-275Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Abstract Together with reuse and material recycling, remanufacturing has emerged as a sustainable approach for used products. Remanufacturing is more complex than manufacturing, due to the uncertainties in material and information flows inside the remanufacturing facility and along the product life-cycle. Therefore, some remanufacturers intend to use lean production principles and philosophies to deal with this complexity and to improve their operations. The aim of this paper is to identify reasons for possible material and information flow uncertainties and develop lean-inspired solution at a German engine remanufacturer. The empirical data were collected via a Material and Information Flow Analysis workshop. The reasons for missing, late, defective and non-available spare parts as well as disrupted, uneven, chaotic and inaccessible information flows are identified. Finally, a lean pull Kanban reordering system is suggested and recognized to be a proper solution to remanufacturing complexity.

    sted, utgiver, år, opplag, sider
    Elsevier, 2015
    Emneord
    Remanufacturing, Product life-cycle, Lean, Pull, Kanban
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-118272 (URN)10.1016/j.procir.2014.07.187 (DOI)000360931800048 ()
    Konferanse
    12th Global Conference on Sustainable Manufacturing - Emerging Potentials, Johor Bahru, Malaysia, 22–24 September 2014
    Tilgjengelig fra: 2015-05-25 Laget: 2015-05-25 Sist oppdatert: 2018-05-17bibliografisk kontrollert
    4. Remanufacturing lead time reduction through a Just-in-time Lean strategy: a case study on Laptops
    Åpne denne publikasjonen i ny fane eller vindu >>Remanufacturing lead time reduction through a Just-in-time Lean strategy: a case study on Laptops
    2017 (engelsk)Inngår i: Proceedings of 3rd International Conference onRemanufacturing (ICOR17), 2017, s. 47-56Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    The annual accumulation of electronic equipment waste, including IT, in the European Union reached at least nine million tons in 2015. These products usually have a limited lifespan, and many consumers tend to buy new devices before their old ones stop working.

    Remanufacturing is one of the effective ways to contribute to IT waste reduction. Product life extension through remanufacturing gives the product one or several more users throughout its life cycle. When remanufacturing is applied to laptops, the extraction of virgin materials, the energy consumption for manufacturing and the amount of waste are all reduced. However, today many remanufacturers of IT face challenges associated with inefficient and complex processes due to uncertainties in core timing, volume and quality. Lean remanufacturing is typically treated as an operations improvement strategy that deals with the process challenges. Just-in-time is one of the lean strategies to address inefficient, long and stochastic operations. Therefore, the aim of this paper is to investigate how just-in-time can help to reduce remanufacturing process lead time, and consequently increase process efficiency.

    The data was collected through a focus group interview and a simplified Value Stream Mapping lean method at an IT remanufacturing company. The company’s remanufacturing process is assessed regarding process lead time and efficiency. Based on the case company's process challenges, the following possible just-in-time solutions were developed for remanufacturers: cellular layout, distinct product family flows and Kanban reordering system.

    Emneord
    Recovering, Laptops, Lean, Just-in-time solutions, Process efficiency
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-142345 (URN)
    Konferanse
    3rd International Conference on Remanufacturing ICOR-17, Linköping, Sweden, October 24-26, 2017
    Tilgjengelig fra: 2017-10-27 Laget: 2017-10-27 Sist oppdatert: 2019-04-02bibliografisk kontrollert
    5. Lean improvements in remanufacturing: solving information flow challenges
    Åpne denne publikasjonen i ny fane eller vindu >>Lean improvements in remanufacturing: solving information flow challenges
    2017 (engelsk)Inngår i: QMOD proceedings, 2017Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    Purpose - One efficient way to prolong the functional life of used products is remanufacturing. Compared to manufacturing, remanufacturing is a complex industrial process due to among other things high product variability, low production volumes and uncertain quality of returned used products. Remanufacturers are dependent on product information from Original Equipment Manufacturers (OEM), but that information is often not shared. Remanufacturers struggle to access or develop lacking product information and need a strategy to address information flow challenges. Lean could be a suitable strategy to improve the information flow. Therefore, the purpose of the paper is to identify and suggest Lean improvements to address remanufacturer’s information flow challenges.

    Methodology/Approach - Based on a case study of a filling machine remanufacturer, this paper discusses the information flow challenges and Lean-based solutions. The data was collected through a three-hour focus group interview combined with a Value Stream Mapping (VSM) method with the participation of seven company employees representing sales, logistics, quality, maintenance and production departments.

    Findings - Two key information flow challenges were identified at the company: a lack of available product data and miscommunication with the OEM, and poor internal information sharing. The analysis of the identified challenges and improvement ideas created a platform for developing Lean-based solutions:1) developing standard operations through instruction checklists and kitting areas;2) boosting supplier and customer relations through six best partnering practices; and3) developing people and teams through teamwork and training.

    Originality/Value of paper – All industries have their own specific challenges and development needs. This paper focuses on information flow challenges in remanufacturing. Original product information is often not shared, even when the remanufacturer has a contract with the OEM. Only few remanufacturers work with Lean today, but Lean could be a strategy to address the information flow challenges. This paper contributes to the knowledge on how Lean could be applied in the remanufacturing context.

    Emneord
    Lean remanufacturing, Information flow, Challenges, Improvements
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-142344 (URN)
    Konferanse
    20th QMOD conference, Copenhagen/Elsinore, Denmark and Helsingborg, Sweden, 5-7 August, 2017
    Tilgjengelig fra: 2017-10-27 Laget: 2017-10-27 Sist oppdatert: 2018-05-17bibliografisk kontrollert
    6. Towards facilitating circular product life-cycle information flow via remanufacturing
    Åpne denne publikasjonen i ny fane eller vindu >>Towards facilitating circular product life-cycle information flow via remanufacturing
    2015 (engelsk)Inngår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 29, s. 780-785Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    In order to achieve a sustainable development, circular economy approaches and circular material flows are explored in industry. However, circular information flows remain essentially unestablished. The aim of this paper is to: 1) explore categories and types of product life-cycle information available for remanufacturing; 2) identify constraints for efficient product life-cycle information flow via remanufacturing; and 3) propose initiatives to facilitate product life-cycle information flow via remanufacturing.

    Data was collected through workshops and interviews at five remanufacturing companies. An accumulated Sankey diagram illustrates product life-cycle information flow, losses and bottleneck. Based on the analysis, possible initiatives to facilitate efficient product life-cycle information flow via remanufacturing are presented.

    sted, utgiver, år, opplag, sider
    Elsevier, 2015
    Emneord
    Remanufacturing; Product life-cycle stackeholder; Feedback; Feed forward; Sankey diagram
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-120761 (URN)10.1016/j.procir.2015.02.162 (DOI)000356146100132 ()
    Konferanse
    22nd CIRP Conference on Life Cycle Engineering (LCE), Univ New S Wales, Sydney, AUSTRALIA, April 7-9, 2015
    Prosjekter
    Återprodukt, KEAP2
    Forskningsfinansiär
    VINNOVA
    Tilgjengelig fra: 2015-08-24 Laget: 2015-08-24 Sist oppdatert: 2018-05-17bibliografisk kontrollert
    7. Remanufacturing challenges and possible lean improvements
    Åpne denne publikasjonen i ny fane eller vindu >>Remanufacturing challenges and possible lean improvements
    2018 (engelsk)Inngår i: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 172, s. 3225-3236Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Remanufacturing is a viable way to prolong the useful life of an end-of-use product or its parts. Despite its economic, environmental, and social benefits, remanufacturing is associated with many challenges related to core (used product or its part) availability, timing and quality. The aim of this paper is to study how lean production could be used to tackle remanufacturing process challenges and contribute to shorter lead times. To meet this aim, we conducted a literature review and case studies of four remanufacturing companies. The case companies remanufacturing challenges were: (1) a lack of material requirements planning system, (2) poor core information, (3) a lack of core material, (4) poor spare parts information, (5) a lack of spare parts material, (6) insufficient quality management practices, (7) large inventories, (8) stochastic remanufacturing processes, (9) a lack of supply-demand balance, and (10) insufficient automation. These challenges contribute to long and variable remanufacturing process lead times. To tackle remanufacturing challenges, seven lean-based improvements with a major effect on improvements in lead time were suggested: standard operations, continuous flow, Kanban, teamwork, employee cross-training, layout for continuous flow, and supplier partnership. Providing that the suggested improvements are implemented, a possible lead time reduction of 83-99 per cent was projected. 

    sted, utgiver, år, opplag, sider
    ELSEVIER SCI LTD, 2018
    Emneord
    Remanufacturing; Circular economy; Lean production; Lead time
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-144880 (URN)10.1016/j.jclepro.2017.11.023 (DOI)000423002500020 ()
    Merknad

    Funding Agencies|Swedish Governmental Agency for Innovation Systems [2013-03333]

    Tilgjengelig fra: 2018-02-09 Laget: 2018-02-09 Sist oppdatert: 2018-05-17
  • 37.
    Lago, Mattias
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Sunesson, Pavel
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Statusbedömning och förbättringsförslag för startkedjemaskineri, startkedja och linspel för stränggjutningsmaskin2008Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The main goal with the master thesis has been to do a status evaluation of the chain machinery with its start chain and wire to secure the production on a short basis due to that a reconstruction is not planned at this time. An evaluation of the condition of the start chain and the rollers in the chain depository has been done. An offer has been requested for a new start chain and the evaluation of the start chains may be a basis for the decision taking. The production has been able to go on, although it has arisen some problems which have been difficult to find the causes for. There is no gathered “picture” of the machinery status and a mapping of each machinery has been compiled of comprehensive logs. Observations and measurements have also been done to prove and elucidate the biggest problems.

    After the compilation a concentration has been done of the two most frequently problems during the last years, that is to say, 2006 to 2008. The work has finally fallen into suggestions for improvements of routines and suggestions for concepts for construction changes to keep a continuous stable production until a bigger reconstruction will be made.

    The two problems which have been focused on were the “limit-switches” for the wires and the heat-radiation-shields situated under the tilt bridges. The arrangement for the wire problem shown to be quite simple to implement and its cause was due to that the friction was to big in the shackle, which function is to be pressed down by the wire, and thereby didn’t trigger an alarm on the computer screens.

    To prevent this, lubrication was done for respective shackle to sustain the production for a short period of time. Although there have been done some concepts to sustain the production for a longer period of time.

    The problems concerning the heat-radiation-shields under the tilt bridges can be solved mainly by changed maintenance routines, which have been attached in the list which has been formed.

  • 38.
    Lindén, Patricia
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik.
    Smart plombering och märkning2006Independent thesis Advanced level (degree of Magister), 20 poäng / 30 hpOppgave
    Abstract [en]

    The background for this degree thesis is a need to replace the existing seal used to protect equipment containing secret or sensitive equipment used by Swedish Defence. The target design should satisfy both the need for tamper evidence and reduce Life Cycle Cost. In developing a new design for a seal, additional benefits such as improved logistics support and indication of attack methods such as heat and solvents have been considered.

    The lack of guiding principles for end users of seals became evident during the interviews. Major concerns for the future are education of users, information about actions if a seal is broken and user liability.

    The design work was divided into several phases. A feasibility study was performed including investigation of theory of labels, materials and possible technologies. The feasibility study also includes a requirement analysis based on interviews. This analysis was later used as a tool for evaluating different concepts.

    Using the list of construction criteria and the morphologic matrix 27 different concepts where created. All of these concepts did not go further in the concept development but are described in the thesis as part of the result. Evaluation of methods for validation and verification was done to get a deeper understanding of material properties and facilitate the requirement process in future work.

    The final result of the design process is two concepts. The first concept is based on 2D-barcode, thermocromic material and a double foil label in which the material at the bottom is brittle. The second concept contains active RFID protected by a brittle material and with clear guiding principles. Both concepts are suitable solutions. The reason for presenting two concepts is some remaining uncertainties with RFID technology used in the second concept.

  • 39.
    Liu, Yang
    et al.
    Department of Production, University of Vaasa, Vaasa, Finland.
    Yang, Wenshan
    Department of Production, University of Vaasa, Vaasa, Finland / Public Meteorological Service Center, Hubei Provincial Bureau of Meteorology, Wuhan, China.
    Meteorological information service support system in wind park application2015Inngår i: Benchmarking: An International Journal, ISSN 1463-5771, E-ISSN 1758-4094, Vol. 22, nr 2, s. 222-237Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Purpose: The purpose of this paper is to introduce a holistic decision support system based on condition-based maintenance which utilizes meteorological forecasting information to support decision-making process in services of wind power enterprises.

    Design/methodology/approach: A pilot conceptual system combining with meteorological information and operations management has been formulated in this study. The proposed system provides benchmarking to support decision making directly and indirectly basing on processing meteorological information and evaluating its impact on service operations. It collects meteorological data to predict failure probabilities in different areas which need corresponding maintenance service and schedule the optimal maintenance periods. In addition, it provides meteorological forecasting and decision support in case of extreme weather events (EWEs).

    Findings: The conceptual study shows that there is a connection between the meteorological conditions and failures, and it is feasible to make service decisions based on the predictions of weather conditions and their impacts to failures. Research limitations/implications ᅵ The research presented at the present phase is not much beyond a conceptual framework. The actual implementation and all possible related practical issues will be dealt with in future research.

    Practical implications: It helps decision makers to predict and identify possible categories of faults in wind turbine, make optimal service decisions to enhance the output performance of wind power generation, and take in advance emergency counteractions in case of EWEs.

    Originality/value: It presents a novel concept and provides a roadmap to achieve optimal operations in wind park application through combining meteorological information system with service decision making.

  • 40.
    Nyberg, Michael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Konstruktion och utveckling av pneumatisk pressfixtur2007Independent thesis Basic level (professional degree), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Flextronics Design i Linköping, som ingår i den stora amerikanskägda Flextronics- koncernen, är en industrialiseringsenhet på mobiltelefonsidan. Det innebär att verksamheten kretsar kring att ta fram test- och monteringsprocesser, samt tillhörande utrustning, som sedan implementeras hos högvolymsfabrikerna belägna i olika låg-kostnads-länder.

    På mobiltelefonerna finns, beroende på modell, ett antal detaljer som pressas fast, antingen för hand, med en manuell press, eller med hjälp av en pneumatisk press. Den sistnämnda pressmetoden används när det rör sig om lite längre presstider på detaljen, från ett par sekunder och uppåt. Idag finns det två modeller som drivs med tryckluft och som pressar med olika kraftintervall beroende på vilket lufttryck som tillförs till systemet. Det har visat sig att det finns ett behov hos företaget att ta fram en ny konstruktion som pressar med ett lägre kraftintervall än de befintliga modellerna kan erbjuda. Det är önskvärt att reducera tillverkningskostnaden jämfört med tidigare modeller. Framförallt är en ny lösning på xy-bordet önskvärd då den står för en stor del av den totala kostnaden. För att tryckbilden, och därmed resultatet, ska bli så bra som möjligt är det också viktigt att konstruktionen går att kalibrera i x- och y-led, samt att även felaktigheter i planheten går att justera.

    Under konstruktionsarbetet har olika tekniska lösningar och koncept tagits fram som utvärderats. Den slutliga konstruktionen består av en tryckluftscylinder som är dimensionerad för att trycka med de krafter som är specificerade. Den rörliga delen av cylindern förs ner och pressar samman detaljen och telefonen som är placerade i en fixtur. Den är i sin tur fixerad i ett justerbart xy-bord som består av två aluminiumplattor med urfrästa spår. Inställningen av tryckbilden i x- och y-led sker med hjälp av styrpinnar. Eventuella skillnader i planheten verifieras redan vid monteringen av pressen, och justeras genom skimsning.

    Tillverkningskostnaden för den nya modellen har reducerats med 30 % jämfört med de tidigare pressarna. Konceptlösningen på det nya xy-bordet innebär en kostnadsminskning med 50 % mot det befintliga bordet.

  • 41.
    Ohlsson, Kristian
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik.
    Framtagning av vibrationsfixtur2005Independent thesis Basic level (professional degree), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Autoliv Electronics AB utvecklar, tillverkar och säljer produkter till fordonsindustrin. När en produkt utvecklas utförs en rad olika miljötålighetstester. Dessa miljötålighetstester skall simulera alla miljöfaktorer som produkten stöter på under sin livscykel. Miljöfaktorerna som testas är mekaniska, kemiska, elektriska och termiska.

    De mekaniska miljöfaktorerna innefattar vibrationer, stötar, fall och slag. När vibration och stöttest utförs används en vibrator. Vibratorn genererar vibrationer och stötar. Testobjekten monteras på fixturer som har kub eller L-form. Fixturerna sitter i sin tur monterade på vibratorns armatur med skruvförband med en speciell hålbild. Kubfixturerna har en hög vikt och tillverkningsmetoden är ålderdomlig. Kubfixturerna består av hopskruvade aluminium-plattor. Denna metod för att tillverka vibrationsfixturer gör att egenfrekvensen minskar.

    Detta examensarbete innefattar framtagning av en vibrations fixtur. De grundläggande kraven från uppdragsgivaren var att fixturen skulle ha en låg vikt, hög styvhet, robust konstruktion, kunna testa tre olika testriktningar samtidigt. Det viktigaste grundläggande kravet var att egenfrekvensen för fixturen var tvungen att överstiga 500 Hz. Den grundläggande idén till fixturens form är baserad på egna erfarenheter.

    Konceptutvecklingen utfördes med hjälp av Hubkas utvecklingsprocedur. Åtta koncept genererades. Den valda konceptlösningen blev en kombination av koncepten med skruvförband.

    Resultatet av detta examensarbete blev en vibrationsfixtur som kan utföra vibrations tester i tre ortogonala riktningar samtidigt. Den första egenfrekvensen för fixturen uppstår först vid cirka 885 Hz. En speciell hålbild användes för att fästa fixturen på bottenplattan med skruvförband. För att underlätta rotationen av fixturen används en indexeringsanordning. Denna indexerings anordning består av ett speciellt urfräst spår i fixturen bakre hörn och en kupolmutter i bottenplattan. För att positionera fixturen efter riktningsändring används en styrklack och urfrästa styrspår i fixturen.

  • 42.
    Olsson, Sofia
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Concept Study of Construction Ingress2008Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The purpose of this thesis is to, on Volvo Truck’s account, look at a new concept for the construction ingress used on construction vehicles which have a higher ground clearance than ordinary trucks. The high ground clearance makes it hard for the driver to reach the first instep and therefore a construction ingress is assembled below the stationary insteps. It is designed in a way that avoids damage if colliding with objects.

    The present construction ingress used is too expensive, too complex and a bit unsteady to climb on. There is also a new construction vehicle being developed and the old ingress might not fit the new truck.

    The concept generation is carried out using systematic concept development. There are many demands and requests for the ingress and these are summarized in a design criterion list. All wished-for properties can not be fulfilled for the simplest ingress designs since they conflict with each other, for example flexibility and stability.

    The concepts that are generated are evaluated and selected through different matrices until one concept is found to be the most promising. Different designs of this concept are discussed and one is chosen as the most suitable. The chosen concept design is already used by at least two competitors and that confirms its suitability.

    The detailed design presented is only a suggestion for a new construction ingress. Before manufacturing the design needs to be analysed more accurately and the strength, material and cost need to be optimized. The analyses made in the project only show that the design is realistic and that it is worth further work. The final design is promising since it is stable to use, consists of only a few simple parts and will be cheap to manufacture.

  • 43.
    Pacheco Roman, Oscar
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Mekanik och hållfasthetslära.
    Evaluation of Finite Element simulation methods for High Cycle Fatigue on engine components2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This document reflects the results of evaluating three computational methods to analyse the fatigue life of components mounted on the cylinder block; two currently in use at Scania and one that has been further developed from its previous state.

    Due to the cost of testing and the exponential increase in computational power throughout the years, the cheaper computational analyses have gained in popularity. When a component is mounted in a fairly complex assembly such as an engine, simplifications need to be made in order to make the analysis as less expensive as possible while keeping a high degree of accuracy.

    The methods of Virtual Vibrations, VROM and VFEM have been evaluated and compared in terms of accuracy, computational cost, user friendliness and general capacities. Additionally, the method VFEM has been further developed and improved from its previous state.

    A in-depth investigation regarding the differences of the methods has been conducted and improvements to make them more efficient are suggested herein. The reader can also find a decision matrix and recommendations regarding which method to use depending on the general characteristics of the component of interest and other factors.

    Two components, which differ in complexity and mounting nature, have been used to do the research.

  • 44.
    Pranzo, Daniela
    et al.
    Masmec Biomed, Italy.
    Larizza, Piero
    Masmec Biomed, Italy.
    Filippini, Daniel
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensor- och aktuatorsystem. Linköpings universitet, Tekniska fakulteten.
    Percoco, Gianluca
    Polytech Univ Bari, Italy.
    Extrusion-Based 3D Printing of Microfluidic Devices for Chemical and Biomedical Applications: A Topical Review2018Inngår i: Micromachines, ISSN 2072-666X, E-ISSN 2072-666X, Vol. 9, nr 8, artikkel-id 374Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    One of the most widespread additive manufacturing (AM) technologies is fused deposition modelling (FDM), also known as fused filament fabrication (FFF) or extrusion-based AM. The main reasons for its success are low costs, very simple machine structure, and a wide variety of available materials. However, one of the main limitations of the process is its accuracy and finishing. In spite of this, FDM is finding more and more applications, including in the world of micro-components. In this world, one of the most interesting topics is represented by microfluidic reactors for chemical and biomedical applications. The present review focusses on this research topic from a process point of view, describing at first the platforms and materials and then deepening the most relevant applications.

  • 45.
    Rotter, Thomas
    et al.
    Healthcare Quality Programs, School of Nursing, Queen’s University, Kingston, Canada.
    Plishka, Christopher
    College of Pharmacy and Nutrition, University of Saskatchewan, Saskatoon, Canada.
    Lawal, Adegboyega
    College of Pharmacy and Nutrition, University of Saskatchewan, Saskatoon, Canada.
    Harrison, Liz
    School of Rehabilitation Science, College of Medicine, University of Saskatchewan, Saskatoon,Canada.
    Sari, Nazmi
    Department of Economics, University of Saskatchewan, Saskatoon, Canada.
    Goodridge, Donna
    College of Medicine, University of Saskatchewan, Saskatoon, Canada.
    Flynn, Rachel
    Faculty of Nursing, University of Alberta, Edmonton, Alberta, Canada.
    Chan, James
    School of Health Sciences, University of Northern British Columbia, Canada.
    Fiander, Michelle
    College of Pharmacy, Department of Pharmacotherapy,University of Utah, USA.
    Poksinska, Bozena Bonnie
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Logistik- och kvalitetsutveckling. Linköpings universitet, Tekniska fakulteten.
    Willoughby, Keith
    Edwards School of Business, University of Saskatchewan, Saskatoon, Canada.
    Kinsman, Leigh
    University of Tasmania and TasmanianHealth Service (North),Launceston, Tasmania, AustraliaCorresponding Author:Christopher Plishka, University of Saskatchewan, E3315 Health Sciences Building, 104 ClinicPlace, Saskatoon, Saskatchewan, Canada S7N 5E5.Email: chris.plishka@usask.caEvaluation & the Health Professions1-25ªThe Author(s) 2018Reprints and permission:sagepub.com/journalsPermissions.navDOI: 10.1177/0163278718756992journals.sagepub.com/home/ehp.
    What Is Lean Management in Health Care?: Development of an Operational Definition for a Cochrane Systematic Review2019Inngår i: Evaluation & the Health Professions, ISSN 0163-2787, E-ISSN 1552-3918, Vol. 42, nr 3, s. 366-390Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Industrial improvement approaches such as Lean management are increasingly being adopted in health care. Synthesis is necessary to ensure these approaches are evidence based and requires operationalization of concepts to ensure all relevant studies are included. This article outlines the process utilized to develop an operational definition of Lean in health care. The literature search, screening, data extraction, and data synthesis processes followed the recommendations outlined by the Cochrane Collaboration. Development of the operational definition utilized the methods prescribed by Kinsman et al. and Wieland et al. This involved extracting characteristics of Lean, synthesizing similar components to establish an operational definition, applying this definition, and updating the definition to address shortcomings. We identified two defining characteristics of Lean health-care management: (1) Lean philosophy, consisting of Lean principles and continuous improvement, and (2) Lean activities, which include Lean assessment activities and Lean improvement activities. The resulting operational definition requires that an organization or subunit of an organization had integrated Lean philosophy into the organization?s mandate, guidelines, or policies and utilized at least one Lean assessment activity or Lean improvement activity. This operational definition of Lean management in health care will act as an objective screening criterion for our systematic review. To our knowledge, this is the first evidence-based operational definition of Lean management in health care.

  • 46.
    Rydberg, Kristofer
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Johansson, Fredrik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling.
    Fältmätning och utmattningsanalys av hjullastarskopa2007Independent thesis Advanced level (degree of Magister), 20 poäng / 30 hpOppgave
    Abstract [sv]

    I denna rapport predikteras livslängden, med avseende på utmattning, för en hjullastarskopa. Två av de mest kritiska svetsarna utvärderas enligt IIW:s (International Institute of Welding) rekommendationer genom nominella spänningsmetoden, hot spot-metoden och effective notch-metoden. Beräkningarna utförs med hjälp av finita elementmetoden. Genom att utföra töjningsmätningar på hjullastarskopan i drift erhålls spänningsdiagram. Dessa uppmätta spänningsdiagram analyseras med rain-flow count-metoden. Med ett antaget samband mellan rain-flow count-histogrammet och de beräknade spänningarna i svets och givarposition, konverteras rain-flow count-histogrammet till att gälla svetsen. Livslängsberäkningarna baseras på de konverterade rain-flow count-histogrammen.

  • 47.
    Sehlin, Daniel
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell ekonomi.
    Truedsson, Maja
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell ekonomi.
    A Conceptual Cooperative Model Designed for Business Processes, Digitalisation and Innovation: A model to develop and improve by visualising and prioritising opportunities of digitalisation with an external innovation partner2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Digital transformations are changing society and they force industries to respond to demands more frequently. Managers are aware of new technical demands, which increase the pressure of meeting those demands. To meet technical demands, radical innovations are one way to stay competitive. However, it is more complex to make them a part of the business. This research is based on a M.Sc. thesis project conducted at Propia AB, which is a process management consultancy firm in Norrköping, Sweden. The goal of the study was to develop a well-defined framework for small and medium enterprises to use for digital transformation of business processes that provide structure to understand the possibilities of digitalisation and how/which business processes should be prioritised. The framework should also create prerequisites for an external innovation partner to develop digital solutions for business processes. The study was performed together with a case company and with an innovation partner. The research had an abductive approach where both deduction and induction where used to study the empirical findings and formulate new theories in relation to recognized theories. Qualitative methods have been used in the empirical study due to their flexibility and the fact that the focus of the information gathering was to create a context. The analysis indicated that a certain level of process maturity could be related to a certain innovation level and a certain level of digital change. The research resulted in a Conceptual Cooperative Model based on the three main areas of digitalisation, business processes and innovation. The model has been validated using design reviews with the case company, consultancy firm and together with an innovation partner. The model will be a practical template for SMEs to follow when digitalising business processes in order to fulfil future customer expectations and needs.

  • 48.
    Shin, Wan Seon
    et al.
    Sungkyunkwan Univ, South Korea.
    Seok Lee, Yong
    Sungkyunkwan Univ, South Korea.
    Dahlgaard, Jens Jörn
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Logistik- och kvalitetsutveckling. Linköpings universitet, Tekniska fakulteten.
    A pattern-based decision framework in the era of Industry 4.02019Inngår i: Total quality management and business excellence (Online), ISSN 1478-3363, E-ISSN 1478-3371Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The primary purpose of this paper is to identify human decision-making patterns that can be transformed into machine decision-making in the era of Industry 4.0. We first isolated 40 key decision attributes and 6 decision patterns based on a literature review. Subsequently, we conducted a survey study of a group of 550 respondents from 11 different industrial types to find out the importance of both the attributes and the decision patterns. The six different human decision patterns (emotion, vision, principle, information, prevention, creation) were analysed for decision problems in both the daily lives and the operational stages of a business. The principle-based decision pattern is preferred for people who work in either Industry 1.0 or 2.0, while the information-based pattern is preferred for Industry 3.0. In the era of Industry 4.0, it seems that creation- and prevention-based patterns are also considered important in addition to principle- and information-based patterns. The decision patterns proposed in this study may be applied to design machines decision-making as a way to represent human decision makers.

  • 49.
    Si, Shubin
    et al.
    Department of Industrial Engineering, School of Mechatronics, Northwestern Polytechnical University, Xian, China.
    Liu, Xiaopei
    Department of Industrial Engineering, School of Mechatronics, Northwestern Polytechnical University, Xian, China.
    Liu, Yang
    Department of Production, University of Vaasa, Vaasa, Finland.
    Takala, J.
    Department of Production, University of Vaasa, Vaasa, Finland.
    Operational competitiveness of Chinese aeronautics and astronautics manufacturing companies in global context2009Inngår i: 2009 IEEE/INFORMS International Conference on Service Operations, Logistics and Informatics, Institute of Electrical and Electronics Engineers (IEEE), 2009, s. 556-560Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The purpose of this paper is to study the operational competitiveness of Chinese aeronautics and astronautics manufacturing companies (CAAMC) by analyzing the case CAAMC in a global manufacturing strategies (GMSS) database. Analytical models are used to analyze the operational competitiveness of the case CAAMC based on the weights of the multi-criteria manufacturing strategies. The results show quality value of the case Chinese astronautics manufacturing company (CASMC) is higher than the case Chinese aeronautics manufacturing company’s, but customer focus value of the case Chinese aeronautics manufacturing company (CAEMC) is higher than the case CASMC’s. The ranking of operational competitiveness implies CASMC has stronger competitiveness than CAEMC in prospector group.

  • 50.
    Si, Shubin
    et al.
    Department of Industrial Engineering, School of Mechatronics, Northwestern Polytechnical University, Xian, China.
    Liu, Yang
    Department of Production, University of Vaasa, Vaasa, Finland.
    Takala, Josu
    Department of Production, University of Vaasa, Vaasa, Finland.
    Sun, Shudong
    Department of Industrial Engineering, School of Mechatronics, Northwestern Polytechnical University, Xian, China.
    Benchmarking and developing the operational competitiveness of Chinese state-owned manufacturing enterprises in a global context2010Inngår i: International Journal of Innovation and Learning, ISSN 1471-8197, E-ISSN 1741-8089, Vol. 7, nr 2, s. 202-222Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The purpose of this paper is to study the operational competitiveness of Chinese State-Owned Manufacturing Enterprises (CSOMEs) by analysing the case CSOME and comparing it with other global manufacturing companies in a Global Manufacturing Strategies (GMSS) database for developing innovation and learning. Analytical models are used to analyse the operational competitiveness of the case CSOME and its subsidiaries based on the weights of the multicriteria manufacturing strategies. The operational competitiveness development of its subsidiaries are applied to predict the future operational competitiveness of the case CSOME in a global context. The results show that quality is the most important competitive priority of the case CSOME and the case CSOME have some advantages when competing in a prospector group. The ranking and stability of the operational competitiveness of the case CSOME imply that: (1) the top CSOMEs have a strong operational competitiveness in the global context; however, they have some gaps compared to the top manufacturing enterprises in the world and (2) it will take a long time for the top CSOMEs to improve their operational competitiveness because of a huge organisational structure. Copyright © 2010 Inderscience Enterprises Ltd.

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