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  • 151. Edvardsson, T
    et al.
    Fredriksson, Hasse
    Royal Institute of Technology.
    Svensson, Ingvar L
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    A study of the solidification process in low-carbon manganese steels1976In: Metal Science, ISSN 0306-3453, Vol. 10, no 9, p. 298-306Article in journal (Refereed)
  • 152.
    Ekengård, Johan
    et al.
    Volvo Powertrain Skövde, Sweden.
    Diószegi, Attila
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Oxygen Activity and Slag Formation in Cast Irons2009In: Proceedings of the Carl Loper Cast Iron Symposium, Madison, Wisconsin, US, 2009Conference paper (Refereed)
  • 153.
    Eklund, Anton
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    TILLGÄNGLIGHETSANALYS AV AUTOMATISERAD PRODUKTIONSLINA2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I en global marknad ställs höga krav på effektiva processer, vilket också är ett viktigt konkurrensverktyg. Konkurrenskraften hos flertalet svenska industrier karakteriseras av innovation kombinerat med ständiga förbättringar. Företag X koncernen är världsledande inom framställning av Produkt X med produktion och försäljning världen över [1]. För att stärka konkurrenskraften krävs ständiga förbättringar av företagets innovativa produktionsprocesser. Företag X:s produktionslina i Fabrik X i Stad X har problem med bristfällig tillgänglighet på grund av en hög andel oplanerade stillestånd. Företagets krav på ständiga förbättringar leder till ett behov av ökad tillgänglighet. Studien syftar till att analysera tillgängligheten i produktionslinan så att resurser kan tillsättas i kritiska delar för att öka möjligheten att uppnå högre produktivitet och lönsamhet.

    Empiriskt material insamlades i Fabrik X i Stad X. Arbetets datainsamling genomfördes med lämpliga metoder i form av observationer, intervjuer & samtal, befintliga dokument och arbetsmätningar. En litteraturstudie av relevant karaktär har tillämpats för att upprätta studiens teoretiska ramverk. Arbetet bygger till stor del på teorier från Total Productive Maintenance. Det teoretiska ramverket tillsammans med en stor andel grundläggande data från datainsamlingen stärker studiens arbete. Resultaten bygger på en analys av insamlad empiri och teoretiskt ramverk.

    Tillgänglighetsstudien har resulterat i en övergripande problemfördelning av hela produktionslinan, vilken är indelad i fem olika celler. Studien visar att oplanerade stillestånd upptar 35 % av planerad produktionstid, där cellområde två står för 52 % av den totala stilleståndstiden och antalet stillestånd är flest där i förhållande till övriga fyra celler. Arbetsmätningar i form av tidsstudier visar att cellområde fyra avviker mest från produktionslinans teoretiskt uträknade cykeltid, där det högst uppmätta värdet överskrider förväntad cykeltid med 61%.

    För att öka produktionslinans produktivitet krävs ett högre utnyttjande av utrustningen i cellområde fyra och minimering av oplanerad stilleståndstid i främst cellområde två. Arbetet har genererat ett antal förslag på förbättringsarbete för att stärka företagets konkurrenskraft. 

  • 154.
    Eklund, Gustaf
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    TV-stativ med nytt ställdon2008Independent thesis Basic level (university diploma), 10 points / 15 hpStudent thesis
  • 155.
    Eklund, Per
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Nordvall, Andreas
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Kvalitetsbristkostnader i samband med reklamationsprocessen2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    During the 1970’s the interest for quality management and the concept of quality costs increased considerably. Business leaders noticed that there was a great potential for reducing costs of poor quality. Since up to 10-30% of a company’s total turnover may consist of poor quality costs some consider them as an unexploited goldmine. The reason for this is that a mapping of poor quality costs creates great opportunities to improve profitability without reducing quality.

    This thesis has been carried out on the behalf of Draka Kabel in Nässjö. The company is a part of the Prysmian Group, which operates in the energy and telecom cables and systems industry. The purpose of the study has been to identify and analyze the quality costs incurred in connection with the complaint process, and to make suggestions for improvements.

    The study began with a literature review of relevant theories in the field. This was made in order to create a solid foundation about common poor quality parameters, but also to gain knowledge about how measurements can be made. The mapping of poor quality costs was made through studies of secondary data and with the help of a relatively large number of interviews with various employees within the company. The complaint process was examined to find its strengths and weaknesses and each type of error was analyzed separately using its process scheme. This was done to obtain a cost but also to find the cause of the problem.

    The mapping shows that Draka Kabel in the first three quarters of 2014 had a total of 439 customer complaints. For example defect products manufactured at Nässjö, defect cables that has been imported, wrong packing and raw material. The study shows that 1,3 % of the company’s order lines during the studied period resulted in customer complaints. This resulted in a cost of just over one million Swedish kronor.

    The result shows that a large number of complaints are due to internal error. This must be seen as positive as the company themselves may affect and fix the problems. If the cause of the problem disappears so does the cost later in the chain. Draka Kabel should be able to reduce the cost of poor quality by implementing a better picking system at their stock department, which would largely eliminate the influence of the human factor. Currently there are a large number of unknown cases regarding defect raw material. The company should therefore improve their communication regarding raw materials in order to get a clearer picture of these costs. 

  • 156.
    Eklund, Peter
    et al.
    Jönköping University, School of Engineering, JTH, Mathematics.
    Haugthon, Johan
    JTH, Mechanical Engineering.
    Utveckling av universaladapter för torkblad i samarbete med European Automotive Supplier AB2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    This report looks at the possibility of designing a universal adapter for Flat Blade windshield wipers in cooperation with European Automotive Supplier AB.

    To understand and see if this is possible, a research and an extensive patent search where done. Then to add structure to the project a Ganttschematic were developed. To generate good and solid ideas, different methods for product development were looked upon.

    When a method was chosen and applied, a series of concepts emerged. Now the focus was to design and construct all the pieces. The desired manufacture procedures were looked upon as well as materials. Lot of time where spent on designing a lock mechanism to meet the demands European Automotive Supplier AB hade given. To choose the right concept the team used a set of selection matrix for the different ideas.

    After the choices were made, different prototypes were made of the concepts. Then they were tested, and improvement on them was done to make the end product better.

  • 157.
    Eklund, Sofia
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    VMI OCH DESS EFFEKTER VID EN IMPLEMENTERING HOS THORN LIGHTING NORDIC AB2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    Advances within the global market have resulted in increased competition between multinational companies. To overcome this increased competition, companies may examine their supply chain. It is a highlighting opportunity for cooperation, resulting in increased chances in the market. Vendor Managed Inventory (VMI) is a strategy in which the supplier gains responsibility of the customer’s inventory. VMI is guided by customer information regarding inventory levels, planned production, forecast and sales history.

    Thorn Lighting Nordic AB the commissioned assigner for the report, has high cost for frozen capital and for obsolescence. The company wants to investigate the effects VMI would have (on their business) and what preparation is required for the cooperation. VMI is an innovative strategy for the company, and as a result they have chosen a supplier with a strong relation and history of closed consignation inventory. Thorn Lighting Nordic AB purchases 150 different articles from its supplier. For a contingent implementation of VMI, it is suggested that 20 articles be used due to the frequent use and high level of balance in inventory, up to 98.8 %. Defects within the VMI system, as problem with the exchange of information, would become visible early in the implementation since the movement of material is stabile.

    There are two varieties of VMI, manual and automatic. These varieties differ in the method of vendor management and control of the inventory. In manual VMI (in relation to this case) the vendor would by the week take stock levels and simultaneously refills the inventory, maintaining a constant level. Automatic VMI is based on electronic data interchange (EDI) or on-line. The difference within the automatic VMI, is the method of information exchange, which is either EDI-messages or web application. The vendor controls the inventory based on information of inventory levels and forecasts.

    Implementation of VMI by Thorn Lighting Nordic AB would result in decreased frozen capital by 229 752 SEK and decreased costs of 35 663 SEK. The advantages of manual VMI are the decrease in administrative work associated with material supply, the financial risk for obsolescence will decrease and back-logs disappear. The disadvantage of manual VMI is the greater space required for the inventory unless the cost will increase with 100 SEK a pallet of material.

    Advantages of automatic VMI exceed those of manual VMI. Are that the stocktaking over the inventory increases and that the exchange of information is more effective.

    The writer recommends automatic VMI, with a web application, is used because of the possibility to increase the system to more vendors without increasing the cost as the other varieties would.

  • 158.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    A Generic Framework for Automated Cost Evaluation of Product Variants and Fabrication Plants2004In: 2004 Proceedings of Design Engineering Technical Conference & Computers & Information Engineering Conference: DETC2004, September 28 - October 2, 2004, Salt Lake City, Utah, USA., 2004Conference paper (Refereed)
    Abstract [en]

    Cost is one of the most important criteria for the evaluation of product variants. In this paper, a framework for building systems for cost evaluation of product variants and fabrication plants is presented and discussed. These systems have the purpose of governing the design work towards solutions having an optimal balance between product and production properties. The starting point of the proposed procedure is the cost structure of a manufactured product: the identification of information needed for the evaluation of different product variants, fabrication plants, or both; where the necessary information can be derived from; and how information accessibility and extraction can be supported. The creation of information models for product cost, plant resources, process plans and product geometry is introduced, and the relationships between models are examined, supporting system development. Important guidelines for the creation of a parametric solid model that will serve as the foundation for an automated cost evaluation system are presented.

  • 159.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    A Method for Computer Supported Generative Process Planning and Cost Estimation2002Report (Other academic)
  • 160.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    A Task Oriented Approach to Documentation and Knowledge Management of Systems Enabling Design and Manufacture of Highly Customized Products2013In: 20th ISPE International Conference on Concurrent Engineering / [ed] Cees Bil, John Mo, Josip Stjepandic, Amsterdam: IOS Press, 2013, p. 119-128Conference paper (Refereed)
    Abstract [en]

    A rapidlygrowing approach in product design and manufacture, with great potential toimprove customer value, is mass customization. The possibility to design andmanufacture highly customer adapted products brings a competitive edge tomanufacturing companies and is in some areas a necessity for doing business. In this paper, an approach for documentation andknowledge management of systems supporting the design and manufacture ofcustomized products is explored. As the governing framework and models are updated and refined due toshifting prerequisite, the system and hence the solutions generated for asingle specification will change over time. This affects product management andthe ability to meet legislation and customers’ requirements regarding documentationand traceability, as well as the company’s ability to provide services,maintenance and supply spare parts. A solution has been developed for an industrialcase with required functionality for capturing, structuring, searching,retrieving, viewing, and editing a system’s embedded information and knowledge.The objective is to enable and facilitate system maintenance and updating andsupport the reuse of functions and system encapsulated generic designdescriptions in future systems.

  • 161.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Automated Cost Estimation of Product Variants: A Tool for Enhanced Producibility2006Licentiate thesis, monograph (Other academic)
    Abstract [en]

    The estimation of product cost is a central activity in the design process. Most companies act in an environment of high competition where the market sets the product price. This, in combination with a focus on satisfying the shareholders’ demand for return on investment, results in a focus on cost as a constraint. Hence, cost is one of the most fundamental criteria for the evaluation of design proposals (French, 1999). However, the manufacturing cost is often calculated late in the product development process when most details are fixed. This means that cost information feedback often arrives too late to be taken into account. That feedback could otherwise have guided the design towards cost-effective, easily produced solutions. Cost estimation is also commonly a task separated from product design and performed by cost accountants. This work distribution requires resources and can be afflicted with loss of information, leading to low quality in the estimations. This subdivision is also not efficient in the search for the best solution, where a number of variant designs are to be evaluated and compared in a short time. When different courses of action are to be evaluated, small changes in customer requirements, product design and production properties have to be handled with caution. Even seemingly small changes can result in undesired effects, such as: low level of conformability with the production system, highly increased cost, and extended manufacturing lead-time.

    The fact that application software is getting more and more adaptable enlarges the possibility of in-house-developed cost estimation systems that can be used as a means for enhanced producibility. This calls for systematic methods for system development that ensure system functionality, quality and longevity.

    This work has resulted in a framework supporting the development of automated systems encompassing the entire workflow: the design of the product variant, the process planning, the cost estimation, the analysis of the effects on the producibility metrics and, finally, the selection of the most favourable course of action. The framework consists of: the procedure for system development, the definition of information models, the clarification of the relations between information models, the guidelines for parametric solid models, and the means for automated process planning and cost estimation.

    The framework has been used when implementing an industry demonstrator. The system can act as a means for enhanced producibility. Different product, production and cost aspects can be studied through the use of multi-objective optimisations, sensitivity analysis, and what-if scenarios enabled by the system. The system can serve as a decisions tool that enables the evaluation of different courses of action in the early stages in the development of product variants. This can imply better decisions and, in the long run, a better company understanding and awareness of the relationships between the product properties, the manufacturing resources requirements/constraints, the manufacturing processing, the cost structure, and the cost level.

  • 162.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Computer Supported Quotation Preparation of Turned Components2012Conference paper (Other academic)
    Abstract [en]

    The quotation preparation in the manufacturing industry is very important. From a subcontractor view, it is initiated by a customer request for quotation and precedes the order preparation where detailed manufacturing and cost information are generated. Customers are continuously seeking for lower bids and cost reduction and despite the lack of detailed information a fixed price has to be set. Commonly, subcontractors are also acting on a market where the competition of staying in business and submitting a winning bid is intense and the result of the quotation process has a direct influence on the final business success. Hence, it is essential to enable quotations to be based on a higher level of detailed information and introduce support to increase the efficiency in quotation preparation. The purpose of this work is to investigate, explore, and develop a computerized method, i.e. an application system, to support the process planning and cost estimation in the quotation process. The main objective is to reveal concepts and principles to support application system development and utilization. The results are based on the experiences from a case study at a subcontractor of turned components.

  • 163.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Computer-Supported Design for Producibility: Principles and Models for System Realisation and Utilisation2007Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    For many products, the adaptation to customer specifications is essential and requires flexible product design and manufacture while maintaining competitive pricing. Engineering design is often concerned with striking a good balance between product properties, e.g. performance, and the resources required to manufacture and assemble the product. When different courses of action are to be evaluated, even seemingly small changes in customer requirements, product design, and manufacturing properties have to be handled with caution. Small changes can entail products with: low level of conformability with the manufacturing system, highly increased cost, and extended manufacturing lead-time. For most companies, the manufacturing system is a valuable asset that is more or less fixed and only minor adaptations are allowed. This implies that the product design has to be adapted to the manufacturing system to a large extent.

    Design for producibility (DFP) is the process in which a systematic method is used to reach the required functional properties of the product at the same time as good compliance with the manufacturing system is ensured. The DFP process usually needs to involve several persons simultaneously for the purpose of sharing information and knowledge. For many manufacturing companies, the collaboration between engineering design and production engineering is a critical issue and they have to improve their methods and tools for ensuring and enhancing producibility. This can be achieved by introducing computer-supported design for producibility. The present research is intended to contribute to the development and utilisation of different application systems that can be used as such computer support. The aim is to provide companies with support in application system development and to show how different application systems can be used in a systematic way as means to ensure and enhance producibility.

    The competitive advantages to gain from introducing computer-supported design for producibility are: product designs with high level of conformability with the production system, shortened manufacturing lead-time, and decreased manufacturing cost. This work contributes to the achievement of these advantages by introducing a framework with principles and models supporting application systems development. Three types of application systems are presented and their practical usefulness is examined, showing practitioners how producibility aspects can be assessed systematically. The main scientific and theoretical contribution of the work comprises: the descriptions concerning how to structure and describe the product and product-related information (manufacturing requirements, costs, process plans and production resources), the foundation of different information models, and the clarification of the models’ interrelationships. This is perceived as a contribution to a better understanding of the domains and how they relate to each other.Design for producibility (DFP) is the process in which a systematic method is used to reach the required functional properties of the product at the same time as good compliance with the manufacturing system is ensured. The DFP process usually needs to involve several persons simultaneously for the purpose of sharing information and knowledge. For many manufacturing companies, the collaboration between engineering design and production engineering is a critical issue and they have to improve their methods and tools for ensuring and enhancing producibility. This can be achieved by introducing computer-supported design for producibility. The present research is intended to contribute to the development and utilisation of different application systems that can be used as such computer support. The aim is to provide companies with support in application system development and to show how different application systems can be used in a systematic way as means to ensure and enhance producibility.

  • 164.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Enhancing the Efficiency and Accuracy in the Quotation Process of Turned Components2008In: 2008 Proceedings of Design Engineering Technical Conference & Computers & Information Engineering Conference: DETC2008, Agust 3-6, 2004, New York City, NY, USA, 2008, p. 10-Conference paper (Refereed)
    Abstract [en]

    Many small and medium sized companies base their business strategy on their manufacturing processes. They are highly specialized in areas such as: die-casting, extrusion, machining, sintering, injection molding etc. The specialization is usually also focused on a limited number of material and alloys for the manufacturing process in question. These companies are commonly acting as subcontractors to other companies, original equipment manufacturers (OEMs). For the OEMs to be able to provide affordable products in a short time and to be at the competitive edge, every new design must be adapted to existing production facilities. In order to ensure this, collaboration between engineering design, at the OEM, and production engineering, at the subcontractors, has to be supported. With the dispersed organizations of today and the increasing amount of information that has to be shared and managed in the product realization process, this collaboration is a critical issue for many companies. A more intense collaboration is sought by many subcontractors as it will strengthen the business relation. To provide manufacturing knowledge and to be a partner in the product realization process is a means to outplay competitors.

    The purpose of this work is to investigate, explore, and develop a computerized method, i.e. an application system, to support the process planning and cost estimation in the quotation process. The main objective is to reveal concepts and principles to support application system development and utilization. The results are based on the experiences from a case study at a subcontractor of turned components.

  • 165.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Knowledge Modelling and Analysis in Design Automation Systems for Product Configuration2010In: NordDesign 2010: proceedings of the 8th biannual conference NordDesign 2010 / [ed] Andreas Dagman, Rikard Söderberg, 2010, p. 257-266Conference paper (Refereed)
    Abstract [en]

    Design automation is an important means for efficient product configuration within an engineer-to-order business strategy. Commonly, the development of a design automation system is an iterative process alternating between top-down and bottom-up approaches. An overall strategy is a necessity for successful system development. However, to successfully structure the design process, retrace all the necessary knowledge and to close gaps in both the process and the knowledge definitions require a complete and detailed understanding of the design problem at hand. The objective with this work is to promote an iterative system development process characterized by the alternation between domain levels and to provide means for ensuring system completeness and functionality. The means introduced in this paper concern knowledge modelling and analysis in design automation systems. An information model, incorporating the concepts KnowledgeObject, Variable and KnowledgeObj_Parameter for knowledge modelling, and a database for the persistent data storage together with the principles of dependencies structure matrices (DSM), supports an iterative system development approach. Further, the quality of a design automation system, in terms of completeness and functionality, can be viewed and analysed continuously during system development, and system deficiencies can be traced by the use of different DSM views.

  • 166.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Modelling and Management of Manufacturing Requirements in Design Automated Systems2007In: Complex Systems Concurrent Engineering: Collaboration, Technology Innovation and Sustainability / [ed] Geilson Loureiro, Richard Curran, London: Springer , 2007, p. 321-328Conference paper (Refereed)
    Abstract [en]

    Initially, when implementing a design automation system the focus is on successfully developing a system that generates design variants based on different customer specifications, i.e. the execution of system embedded knowledge and system output. However, in the long run two important aspects are the modelling and management of the knowledge that govern the designs. The increasing emphasis to deploy a holistic view on the products properties and functions implies an increasing number of life-cycle requirements. These requirements should all be used to enhance the knowledge-base allowing for correct decisions to be made. In a system for automated variant design these life-cycle requirements have to be expressed as algorithms and/or computational statements to be intertwined with the design calculations. The number of requirements can be significantly large and they are scattered over different systems. The aim of the presented work is to provide an approach for modelling of manufacturing requirements, supporting both knowledge execution and information management, in systems for automated variant design.

  • 167.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Supporting Management and Analysis of Quotations in a Design Automation Approach to Customization2010In: New World Situation - New Directions in Concurrent Engineering: Proceedings of the 17th ISPE International Conference on Concurrent Engineering, 6 - 10 September, 2010, Cracow, Poland, 2010 / [ed] J. Pokojski, S. Fukuda, & J. Salwiński, 2010, p. 401-409Conference paper (Refereed)
    Abstract [en]

    A business strategy based on customized products with a high level of variety requires systems for efficient generation of product variants. An area identified in near collaboration with five industrial partners that has not been subject for extensive research is how to support management of different application domains, projects, task knowledge and design information together with the possibility to perform detailed analyses on the data generated by a design automation system implementation. Initially, a number of success criteria were identified and the functionality of a database was perceived as a promising approach. Explorative work was conducted for the purpose to reveal the conceptual model and the principles that a system would reside upon. The work has resulted in an approach, consisting of an information model and underlying principles, presented in this paper to be used when developing a design automation system for quotation preparation. The functionality and usefulness has been demonstrated and validated by a system implementation developed in collaboration with an industry partner. It can be concluded that a system founded on the presented approach supports management and analysis of quotations and product variants.

  • 168.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Supporting Management and Maintenance of Manufacturing Knowledge in Design Automation Systems2008In: Advanced Engineering Informatics, ISSN 1474-0346, E-ISSN 1873-5320, Vol. 22, no 4, p. 445-456Article in journal (Refereed)
    Abstract [en]

    Many companies base their business strategy on customized products. To enable a high level of product adaptation in an engineer-to-order approach companies invest time and resources to develop design automation systems. Initially, when implementing a design automation system, the focus is on successfully developing a system that generates design variants based on different customer specifications (i.e. the execution of system embedded knowledge and system output). However, in the long run, two important aspects are the management and maintenance of the knowledge that governs the designs. Further, the increasing emphasis on deploying a holistic view of a product’s properties and functions implies an increasing number of life-cycle requirements. The knowledge to adapt the product to fulfil these requirements should also be used and consequently incorporated into the knowledge-base, allowing for correct decisions to be made. In a system for automated variant design, the implications on the product of these life-cycle requirements have to be expressed as algorithms, production rules and/or computational statements to be intertwined with the design calculations. The number of requirements can be significantly large, and the knowledge scattered over different application systems used for the realisation of the design automation system. This makes it difficult to manage and maintain the system as the product life-cycle environment changes and evolves. In this article, the focus is on the requirements related to manufacturing. For that, an approach for the modelling of manufacturing requirements, supporting both knowledge execution and information management, in systems for automated variant design is introduced. The approach has been applied and refined when developing a design automation system in cooperation with a company to demonstrate and verify the approach’s usability.

  • 169.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Supporting Quotation Preparation by Process and Knowledge Modeling: Principles and Concepts for Automation2011In: Proceedings of the ASME 2011 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference, IDETC/CIE 2011, August 29-31, 2011, Washington, DC, USA, New York: American Society of Mechanical Engineers , 2011, Vol. 2a, p. 749-758Conference paper (Refereed)
    Abstract [en]

    Subcontractors are commonly involved in several quotation processes and new requests for quotation are continuously received from clients. To be able to respond with feasible design solutions at competitive price, new ways of working has to be adopted, especially when it comes to quotation preparation. High levels of accuracy of the preliminary design solutions and the cost estimations generated in the quotation process are a necessity. The purpose of this work is to investigate, explore, and develop a computerized method to support quotation preparation. The main objectives are to reveal concepts and principles to support application system development and evaluate the applicability of automated quotation preparation. The results are based on experiences from a case study at a sub-supplier to the car industry. In the case study, a design automation system for quotation preparation of seat heaters was developed. The system supports the pursuit of a valid design solution and the best solution in the individual case enabling the company to respond quickly with a competitive price when receiving a new request. In this paper, principles and concepts supporting system development are introduced and the system’s applicability as a means in quotation preparation explored.

  • 170.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Towards an Integrated System Foundation for Quotation Preparation2010In: Proceedings of Design2010, May 17-20, 2008, Dubrovnik, Croatia, 2010, p. 1493-1502Conference paper (Refereed)
    Abstract [en]

    Subcontractors are frequently involved in quotation processes and the main objective of this work is to provide an integrated system foundation for quotation preparation that enables detailed analyses of product, process, and cost information. The technology, models and principles for successful system realization are described and a case example illustrating system functionality and utilization introduced. The system foundation enables flexible access to stored information supporting analyses across orders and product variants as well as on a more detailed level for individual product items.

  • 171.
    Elgh, Fredrik
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Cederfeldt, Mikael
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    A Design Automation System Supporting Design for Cost: Underlying Method, System Applicability and User Experiences2005In: Next generation concurrent engineering - Smart and Concurrent Intergration of Product Data, Sevices, and Control Strategies: Proceedings of the 12th ISPE International Conference on Concurrent Engineering: Research and Applications, 25 - 29 July, 2005, Ft. Worth/Dallas, Texas, USA., New York: International Society for Productivity Enhancement , 2005, p. 619-627Conference paper (Refereed)
    Abstract [en]

    The fact that application software are getting more and more adaptable extends the possibility of in-house developed design systems supporting design for cost. This calls for systematic methods for system development that ensure system functionality, quality and longevity.

    In this work, a method supporting the development of automated systems for product design, process planning and cost estimation is introduced. The method has been the foundation on which an automated system for variant design has been developed. The system applicability as a means of gaining cost effective design is presented through studies of: multi-objective optimisation, what-if scenarios and sensitivity analyses. The work is completed by an evaluation of the three types of studies. This is followed by an evaluation of the variant design system and its underlying method (that supports in-house development of automated systems), with respect to a number of presented underlying general criteria supporting realisation of systems meeting companies’ needs.

  • 172.
    Elgh, Fredrik
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Cederfeldt, Mikael
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Concurrent Cost Estimation as a Tool for Enhanced Producibility: System Development and Applicability for Producibility Studies2007In: International Journal of Production Economics, ISSN 0925-5273, E-ISSN 1873-7579, Vol. 109, no 1-2, p. 12-26Article in journal (Refereed)
    Abstract [en]

    The paper aims at presenting the thoughts behind concurrent cost estimation as a tool for engineering companies to obtain enhanced producibility for their products by the possibility of performing producibility studies. The two main parts of the paper are: the presentation of a method for system development, focusing on a number of general criteria of system development; and how such a system can act as a support in the product development process by providing the possibility of performing different types of producibility studies.

  • 173.
    Elgh, Fredrik
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Cederfeldt, Mikael
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Cost-based Producibility Assessment: Analysis and Synthesis Approaches through Design Automation2008In: Journal of engineering design (Print), ISSN 0954-4828, E-ISSN 1466-1837, Vol. 19, no 2, p. 113-130Article in journal (Refereed)
    Abstract [en]

    The demand on high levels of reliability and accuracy of cost estimation increases in a competitive environment and as the products are getting more optimised. When different courses of action are to be evaluated, changes in customer requirements, design features and parameters, and production properties have to be handled with caution. Even small changes can imply: low level of conformability with the production system, highly increased cost, and extended manufacturing lead-time. It is of paramount importance for the product success and the company’s profit that a system for automated producibility assessment is sensitive and can reflect these effects. Two central tasks in the development of such a system are the definition of a cost model and the modelling of producibility rules. Each organisation is very different and therefore has to define their individual cost model and set of producibility rules. This work presents an approach that provides a framework for the development of company specific automated producibility estimation systems. Further, the concepts of analysis driven and synthesis driven producibility estimations are described and some examples of their use are given.

  • 174.
    Elgh, Fredrik
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Cederfeldt, Mikael
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Documentation and Management of Product Knowledge in Systems for Automated Variant Design: A Case Study2010In: New World Situation - New Directions in Concurrent Engineering: Proceedings of the 17th ISPE International Conference on Concurrent Engineering, 6 - 10 September, 2010, Cracow, Poland, 2010, 2010, p. 213-220Conference paper (Refereed)
    Abstract [en]

    A business strategy based on customized products with a high level of variety requires systems for efficient generation of product variants. The development of a system for automated variant design is a significant investment in time and money. To maintain the system’s usefulness over time, frequent updating of design rules and execution control will normally become a necessity. Significant efforts are required for maintenance and adapting an established system to changes in product technology, new product knowledge, production practices, new customers and so forth. Another important aspect that has been identified, is the reuse of the system encapsulated generic product family descriptions, for example design rules, when developing a new product family. In this paper a case study is presented with the objectives to provide an understanding and an insight into a real industrial case. A focus is put on the documentation and management of product related knowledge for the purpose of revealing problems related to the current state of practice at the company to identify areas for improvements. The results are based on the experiences from a case study at a company with long experience of systems for automated variant design.

  • 175.
    Elgh, Fredrik
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Cederfeldt, Mikael
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Producibility Awareness as a Base for Design Automation Development: Analysis and Synthesis Approach to Cost Estimation2006In: Leading the Web in Concurrent Engineering - Next Generation Concurrent Engineering: Proceedings of the 13th ISPE International Conference on Concurrent Engineering: Research and Applications, 18 - 22 September, 2006, Antibes, France, 2006, p. 715-728Conference paper (Refereed)
    Abstract [en]

    The demand on the level of reliability and accuracy of cost estimation increases in a competitive environment and as the products are getting more and more optimised. When different courses of action are to be evaluated small changes in customer requirements, design features and parameters, and production properties has to be handled with caution. Small changes can imply: low level of conformability with the production system, highly increased cost, and extended manufacturing lead-time. It is of paramount importance for the product success and the company’s profit that a system for automated cost estimation is sensitive and can reflect these effects. Design automation system incorporating producibility and cost estimations support either analysis driven or synthesis driven producibility estimation, or both. The later is an approach that allows for decreased recourse and time demand as the system only generates design proposals which the company can produce with its manufacturing resources. This work presents some of the views on which a design automation incorporating producibility and cost estimations should by developed. It also presents the concepts of analysis driven and synthesis driven producibility estimation and gives some examples of there use.

  • 176.
    Elgh, Fredrik
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Poorkiany, Morteza
    Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Supporting Traceability of Design Rationale in an Automated Engineer-To-Order Business Model2012In: DS 70: Proceedings of DESIGN 2012, the 12th International Design Conference, Dubrovnik, Croatia / [ed] Marjanovic Dorian, Storga Mario, Pavkovic Neven, Bojcetic Nenad, 2012, p. 1425-1434Conference paper (Refereed)
    Abstract [en]

    The ability to efficiently and quickly design and manufacture highly customized product can provide a competitive advantage for companies acting on a market with shifting customer demands. A business model based on highly customized product requires advanced application systems for automating the work of generating product variants based on different customer specification. The establishment of a system for automated design and production preparation is a significant investment in time and money and is expected to give revenues over many years. To maintain a design automation system’s usefulness over time, frequent updating of design rules and execution control will normally become a necessity. Reuse of the system encapsulated generic product family descriptions when developing a new product family is also perceived to significantly increase the efficiency in system development. The scope and the purpose of this research originate from industrial problems and needs which have been identified within research projects carried out in near collaboration with industrial partners. New concepts, perceived as prescriptive models, are in this work introduced, evaluated, and refined which is in accordance with the design modelling approach [Duffy, Andreasen, 1995]. The focus of this paper is a case study carried out at a company with long experience of systems for automated variant design. The main objective is to provide a system foundation for modelling and management of product knowledge in design automation systems to support reuse, expansion and maintenance.

  • 177.
    Elgh, Fredrik
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Sunnersjö, Staffan
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    An Automatic Cost Estimating System for Variant Design Based on the Method of Successive Calculus2003In: Research for Practice - Innovations in Products, Processes and Organisations: Proceedings of the 14th International Conference on Engineering Design, August 19 - 21, 2003, Stockholm, Sweden., Glasgow: The Design Society , 2003Conference paper (Refereed)
    Abstract [en]

    For many products, the adaption to customer specifications is essential and requires flexible product design and manufacture while maintaining competitive pricing. A large category of design work in industry has the character of the redesigning of an existing product concept in terms of dimensional changes, topology variations and the configuration of components. In order to evaluate design proposals, costs, controlled by the product design, selected materials and manufacturing processes, need to be estimated. Cost estimates are normally based on the manufacturing process plans. They, in turn, can only be formed when production preparation is finalised. The widespread industrial use of solid modelling opens up new possibilities for automating this process. The purpose of this work is to demonstrate and test a method of extracting product information from a CAD model in order to allow process planning and cost calculation to be carried out automatically for a given class of products. With such a system, cost estimates can be made available to the designer the instant a design proposal has been presented. This allows design iterations to be carried out, in order to govern the design work towards solutions with an optimal balance between product and production properties.

  • 178.
    Elgh, Fredrik
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Sunnersjö, Staffan
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    An Ontology Approach to Collaborative Engineering for Producibility2009In: E-Collaboration: Concepts, Methodologies, Tools, and Applications / [ed] Ned F Kock, Hershey/New York: Information Science Reference , 2009, p. 1000-1019Chapter in book (Other (popular science, discussion, etc.))
  • 179.
    Elgh, Fredrik
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Sunnersjö, Staffan
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    An Ontology Approach To Collaborative Engineering For Producibility2007In: International Journal of e-collaboration, ISSN 1548-3673, E-ISSN 1548-3681, Vol. 3, no 4, p. 21-45Article in journal (Refereed)
    Abstract [en]

    With today’s high product variety and shorter life cycles in automobile manufacturing, every new car design must be adapted to existing production facilities so that these facilities can be used for the manufacturing of several car models. In order to ensure this, collaboration between engineering design and production engineering has to be supported. Sharing information is at the core of collaborative engineering. By implementing an ontology approach, work within domains requirement management, engineering design and production engineering can be integrated. An ontology approach, based on an information model implemented in a computer tool, supports work in the different domains and their collaboration. The main objectives of the proposed approach are: supporting the formation of requirement specifications for products and processes, improved and simplified information retrieval for designers and process planners, forward traceability from changes in product systems to manufacturing systems, backward traceability from changes in manufacturing system to product systems, and the elimination of redundant or multiple versions of requirement specifications by simplifying the updating and maintenance of the information.

  • 180.
    Elgh, Fredrik
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Sunnersjö, Staffan
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Collaborative Engineering for Enhanced Producibility by Ontology-based Integration of Design and Production2009In: Virtual Team Leadership and Collaborative Engineering Advancements: Contemporary Issues and Implications, Hershey: Information Science Reference , 2009Chapter in book (Refereed)
    Abstract [en]

    Many companies base their business strategy on customized products with a high level of variety and continuous functional improvements. For companies to be able to provide affordable products in a short time and be at the competitive edge, every new design must be adapted to existing production facilities. In order to ensure this, collaboration between engineering design and production engineering has to be supported. With the dispersed organisations of today combined with the increasing amount of information that has to be shared and managed, this collaboration is a critical issue for many companies.

    In this article, an approach for sharing and managing product and production information is introduced. The results are based on the experiences from a case study at a car manufacturer. By ontology-based integration, work within domains engineering design, production engineering and requirement management at the company was integrated. The main objectives with the integration were: support the formation of requirement specifications for products and processes, improve and simplify the information retrieval for designers and process planners, ensure traceability from changes in product systems to manufacturing systems and vice versa, and finally, eliminate redundant or multiple versions of requirement specifications.

  • 181.
    Elgh, Fredrik
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Sunnersjö, Staffan
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Ontology Based Management of Designer's Guidelines for Motorcar Manufacture2006In: Challenges in collaborative engineering CCE’06 - State of the Art and Future Challenges in Collaborative Design: Proceedings of the 4th International Workshop on Challenges in Collaborative Engineering, April 19 - 21, 2006, Prague, Czech Republic, Jönköping: Department of Computer & Electrical Engineering, School of Engineering , 2006, p. 71-83Conference paper (Refereed)
    Abstract [en]

    With today’s high product variety and shorter life cycles in motor car manufacture, every new car design must be adapted to existing production facilities so that these can be used for several car models. Sharing information is at the core of collaborative engineering. With an ontology approach, the work within the domains requirement management, engineering design and production engineering can be integrated. An ontology approach based on an information model implemented in a computer tool supports the work in the different domains and their collaboration. In our work we make use of the existing structures and link those using appropriately named links. We also propose the introduction of a new structure describing the generic functions of the manufacturing system, MSF. This tree structure is a suitable tool to link product related objects to their associated production equipment at varying levels of detail. The manufacturing requirements are modelled using a concept for the definition of the requirement content, called Manufacturing Requirement (MR). To enable the MR to cover different ranges and levels, and enhance the maintenance of the system integrity, the concept of Requirement Object is introduced. The RO is used to collect the instances for which a specific MR is valid. We also use the rule inference facility to reduce the number of explicitly defined relations.

  • 182.
    Eliasson, Fredrik
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Henningsson, Jesper
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Reinevik, Christian
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Produktkalkylering på ett Värmebehandlingsföretag2007Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this report is performed on behalf of a Heat Treatment Company. The commission is to create a calculation model of their machines, BA1 and BA2. In the commission it is included to put together a line utilization follow-up for these plants. The calculation model will be used for pricing towards customers. At present, the pricing can be a bit unfair when certain products is more man intensive and requires more treatment time than others because of the product design.

    Today the company’s prices only considering harden deep, harden method and weight. The bigger an order is in weight, the cheaper per kilo it becomes. No or little consideration is taken to product design or that light and bulky products takes longer time to treat. Neither that certain products requires more manual work is considered.

    Since the products requires different amount of treatment time we’ve divided them into three different classes. These are described in chapter three and are based on how manageable and how man intensive the products are. It also shows that consideration must be taken to which treatment method that is used, which can be divided into hardening and case-hardening. By using the equivalent method we considered the resource used by each product.

    The follow-up for BA1 and BA2 regarding the utilization shows that they have a rather poor utilization; it’s between 3 % and 67 % for the different products classes.

    Our calculation shows that considerations must be taken to treatment time, that partial depend on product design and treatment methods. The result also shows that products of certain classes today have a higher unit cost than current pricing. This mostly concerns products associated to class C.

  • 183.
    Eliasson, Martin
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Ristander, Robin
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Gustafsson, Joacim
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Ställtidsreducering med hjälp av SMED i pressgjuterianläggningar2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    To maintain production in high salaries countries and strength in competition against other companies, it is today more important than ever to maximize production, offer a wide spectra of products and be able to deliver on the customers desire of shorter and shorter delivery time. Flexible production and short time spent on die changes is vital to achieve these desires. The interest for die changeover time reduction grew in the same pace as the demand for increased product variety grew. SMED as a method of reducing time spent on die changeovers were developed in between 1950-1970, by the Japanese Shigeo Shingo.

    The purpose of this thesis work has been to investigate the result of SMED in a die casting facility, and compare the result from it with the result considering time spent on die changeovers when investing in new equipment. The goal is to implement a thorough investigation by using the SMED method at Tenhults Pressgjuteri AB and make a brochure that have to be simple to understand, in purpose to draw interest to the advantages of using SMED as a method.

    Commissioned by the Swedish foundry association Swecast, the work has been carried out by studying die changeovers at Tenhults Pressgjuteri AB, where filming and interviews with the operators have been included in the analysis. Meetings have been held with Husqvarna AB about their expected earnings on there new investment.

    The work with analyzing die changeovers resulted in following suggestions of improvement:

    • Manuals of adjustments to the sprayer

    • Rapid couplings to the warmth- and cooling hoses

    • Eliminating the work of adjustment when changing the ladle

    • Introduced a combined spanner- torque wrench

    • Manuals to the mechanical lock

    The total theoretical improvement of these measures, along with routines for making outside exchange of die before the machine was shut downed, became a reduction of time spent on die changeover with 60%, from 167 minutes to 66 minutes. That corresponds to a capacity/possible sale increase with 3030 SEK/changeover.

    The conclusion of this survey is that investing in new equipment is not the best way to gain capacity. Better results can be made just by working with die changeovers on the present machines. If a company has worked with reducing time spent on die changeovers before, and is about to replace an old machine, it could be a cause to invest in new technological details to make the work with die changeovers less complicated.

  • 184.
    Elmquist, Lennart
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting.
    Diószegi, Attila
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting.
    Influence of Solidification on the Primary Austenite Structure of Grey Cast Iron2008Report (Other academic)
    Abstract [en]

    In this work, the influence of cooling rate, chemical composition and inoculation practice on the solidification of grey cast iron has been examined. The primary solidification structure, referred to as the macrostructure, was preserved using a special heat treatment, DAAS (Direct Austempering After Solidification). These samples were etched and the number of equiaxed and columnar crystals as well as the transition between these areas, CET, was examined quantitatively. Samples considered As-Cast were colour etched to reveal the microstructural constituents. On these samples the number of eutectic cells, fraction of primary austenite and DAS (Dendrite Arm Spacing) was investigated. The relationship between CET and the number of equiaxed crystals was confirmed, and decreases with increasing number of equiaxed crystals per unit volume. It was also found that the number of equiaxed chemical composition. Furthermore, there is a relationship between eutectic cells and DAS; where the eutectic cell size increases with increasing DAS. DAS, on the other hand, depends on inverse cooling rate and the number of equiaxed crystals.

  • 185.
    Elmquist, Lennart
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Diószegi, Attila
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    On the Problems of a Migrating Hot Spot2010In: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 649, p. 443-448Article in journal (Refereed)
  • 186.
    Elmquist, Lennart
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Diószegi, Attila
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Shrinkage Porosity and its Relation to Solidification Structure of Grey Cast Iron Parts2010In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 23, no 1, p. 44-50Article in journal (Refereed)
  • 187.
    Elmquist, Lennart
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting.
    Diószegi, Attila
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting.
    The relation between SDAS and eutectic cell size in grey iron2010In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 23, no 4, p. 240-245Article in journal (Refereed)
  • 188.
    Elmquist, Lennart
    et al.
    Jönköping University, School of Engineering, JTH. Research area Component Technology. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Diószegi, Attila
    Jönköping University, School of Engineering, JTH. Research area Component Technology. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Adolfsson, Stefan
    Characerizing Shrinkage Porosity in Gray Cast Iron using Microstructure Investigation2008In: Transactions of the American Foundry Society: volume 116 ; One Hundred Twelfth Annual Metalcasting Congress, May 17-20, 2008, Schaumburg, Ill.: American Foundry Society , 2008, Vol. 116, p. 691-703Conference paper (Other academic)
  • 189.
    Elmquist, Lennart
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Component Technology.
    Orlenius, Jessica
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Component Technology.
    Diószegi, Attila
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Component Technology.
    Influence of Melting Process on Oxygen Content in Gray Iron2007In: Transactions of the American Foundry Society: One Hundred Eleventh Annual Metalcasting Congress May 15 - 18, 2007, Schaumburg, Ill.: American Foundry Society , 2007, Vol. 115, p. 625-636Conference paper (Refereed)
    Abstract [en]

    The amount of dissolved oxygen, as well as oxygen available as oxides, is considered to affect the nucleation and growth of porosity defects in gray iron castings. Therefore, the influence of melting process on oxygen content was investigated in the production at two foundries. The importance of temperature on the equilibrium between the melt and its surrounding was especially examined. It was found that the amount of dissolved oxygen decreased with decreasing temperature, but the total amount of oxygen remained unchanged, meaning that the amount of oxygen found as oxides increased as the temperature decreased.

  • 190.
    Elmquist, Lennart
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Salera, Sebastian
    Diószegi, Attila
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Inoculation and its effect on primary solidification structure of hypoeutectic grey cast iron2010In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 23, no 2, p. 124-129Article in journal (Refereed)
    Abstract [en]

    The solidification of grey cast iron is controlled by the addition of inoculants. This is done in order to provide nucleation sites and hence facilitate the formation of eutectic cells and decrease the degree of undercooling. The number of eutectic cells and the graphite morphology affect the final properties of the casting. Preceding the nucleation of graphite and the eutectic cells is the nucleation of the primary austenite. It was found that the addition of inoculants also influences the primarysolidification. The largest effect on the primary dendrites is obtained by inoculation using pure ironpowder. It was also shown how the columnar to equiaxed transition (CET) depends on the number ofequiaxed dendrites per unit volume. In addition, the primary structure was found to influence the eutectic solidification. The relationship between the secondary dendrite arm spacing and the eutectic cell size was found to correlate well with the work of others.

  • 191.
    Eriksson, Gusten
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Persson, Karin
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Studie och förbättring av Saab Training & Simulations projektmodell och arbetssätt2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this bachelor thesis was to examine risks in Saab Training & Simulations project model and the way they execute projects to present an improvement proposal. The study was executed through quantitative and qualitative data gathering in form of interviews and collecting of project reports. The result showed differences between the project model and the execution. The risks were mainly connected to the execution and could be summarized in to three problem areas, manager dependent project management that creates confusion and uncertainty in the line organization and project groups, communication faults during the execution resulting in unnecessary purchases and that the projects show a tendency of needing more resources at the end of the project due to postponed milestones. Based on the findings an extensive literature review treating general project management, project model and methods as concurrent engineering and agile methods were made. After further analysis, an improvement proposal could be formed, however since Saabs project model were found adequate with several parallel and time effective element the improvements are focused towards the way of working in four hands-on suggestions.

    • Clear assignation of responsibility - A clearer assignation of responsibility reduces the risks associated with ambiguity and misunderstandings, as a result of person dependent project management. 

    • Project pulse - Adoption of pulse meetings in the project groups.

    • Increase customer contact - By increasing the contact and integration with the customer could it be assured that their demands are meet even though it is not known during the sale.

    • Design for manufacturing and assembly - Clearer guidelines and a way of working and cooperating internally during the product realization could decrease the risk of unnecessary purchases.

  • 192.
    Eriksson, Magnus
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Karlsson, Felix
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Metallersättning inom byggbranschen2006Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    In this paper the possibilities to replace metal with plastic in products for the building industry were looked into. The first part was a market examination where several suitable products were found. After evaluation the door latch for in-house doors was selected to be re-designed to better suit the properties of plastic.

    New types of mechanisms were designed with different functions that use the benefits of plastic materials. Models of these mechanisms were developed to evaluate their function. The components in the different mechanisms were adapted for manufacturing with injection moulding.

    To confirm that the plastic material could handle the appearing stresses calculations on the most vulnerable parts were carried out. The result of the re-design process was three types of door latches that all fit in the doors standard cut-out. Model Classic is similar to the existing mechanism but the number of components is less than half and assembly and manufacturing is simplified. Model Magneto uses a magnet to move the locking part when the door is closed. Opening and locking is the same as Classic. Model Push/Pull uses a pushing or pulling motion to open the door depending on which side it is operated from.

  • 193.
    Eriksson, Martin
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Stridkvist, Dennis
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Referensdesign av tryckknappar för bilinteriör: Förslag och koncept för framtidens tryckknappar2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report presents a thesis done in the field of mechanical engineering with a focus on product development and design. The work was done together with Kongsberg Automotive AB in Mullsjö. The company wants to investigate the push button solutions available on the market today and the solutions that seem promising for the future. The purpose of this thesis is to examine what the user perceives as quality and define which solution the company should use in future products.

    To make the subject less about an abstract feeling of quality a method for interviewing end users was created. This allowed their feelings about good and bad characteristics to be concretized to statistical data about characteristics and buttons tested in the study.

    These statistics where then used in a product development process to create concepts from ideas. With support from an experienced professional a direction was set to create prototypes built around existing switches matching the results of the interview based study.

    The result is a number of concepts for solutions, as well as 3D-printed prototypes of the more promising solutions followed by advice on which direction future research in the area should be headed.

    The task was solved with several well documented methods such as Kano. With these methods, the market has been reviewed, user comments about quality have been collected and analyzed and new concepts has been created to accompany the coming trend and meet user demands.

  • 194.
    Eriksson, Rikard
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Förstudie av Electric Winch Device2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta examensarbete har utförts i samarbete med och på uppdrag av Kiwanotech AB. Uppdraget var att göra en förstudie av produktidén

    elektrisk vinschvev, med fokus på att framställa en funktionell designprototyp samt att testa och utvärdera dess motor och batteri.

    På en segelbåt finns ett antal vinschar som används för att hissa och spänna segel samt till en rad andra tillämpningar. Produktidén var att, istället för att använda den löstagbara handveven, driva vinschen med en portabel motorenhet. Syftet med produktidén var att lindra vinschanvändarens fysiska ansträngning och bidra till en trivsammare seglats.

    Arbetet innefattade att söka reda på, för projektet lämpliga, motor och batteri samt utifrån dessa konstruera en funktionell designprototyp att visa på båtmässan

    Allt för sjön. Vidare avsågs att kontrollera prestandan hos motor och batteri i relation till arbetet att driva vinschen.

    Designprototypen har tagits fram genom användande av morfologimatris och mock-up modeller för konceptgenerering samt CAD-verktyget Solid Works för konstruktionsarbetet.

    Komponenterna har testats genom att i experiment låta dessa driva vinschen vid olika belastningar. Belastning, spänning, ström och varvtal har sedan jämförts för bestämmande av inbördes påverkan och därmed hur möjlig redigering påverkar prestandan.

    Arbetet resulterade i en funktionell designprototyp som har visats på båtmässa,

    Allt för sjön, samt konstaterad fakta om testade komponenter.

  • 195.
    Eriksson, Thomas
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    CUSTOMER FOCUSED DESIGN: development of a new concept for Nimbus Boats2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This Master thesis project was made in collaboration with Nimbus Boats, who manufacture leisure boats for sports and cruising. The aim was from a customer focused approach develop a new 27 feet motorboat. The purpose was to investigate how a new boat concept could look like, especially from a customer perspective and reflect on the design process. The target was to develop an innovative, functional and aesthetical pleasing concept with a focus on the near future market.

    This project is theoretically based on the design process, design thinking theory and design methods. The product development process relied heavily on market research as unstructured interviews, semi-structured interviews and a big survey was employed early in the process. A long with background analysis the design process also included methods like: the design brief, project planning, stakeholder analysis, ergonomics, competitor analysis, benchmarking, functional analysis, target group/ personas, image board, brainstorming, semantics, sketching, evaluation methods, CAD-modeling and finally physical model building. The aim was to develop a very social, comfortable and secure boat that can deliver the ultimate feeling of freedom and experience of nature.

    The result of the design process was a rendered model and a physical model in scale 1:20 that hopefully fulfilled the purpose well. The concept has a modern, dynamic, vigorous and sporty look with large social areas.

  • 196.
    Fagerlind, Anna
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Spruttransporten2010Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 197.
    Fahlgren, Hanna
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Vibration Analysis of Electronic Unit2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 198.
    Falk, Niklas
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Levinsson, Alexander
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Ställtidsreducering i robotcell för ökad tillgänglighet2015Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
  • 199.
    Fourlakidis, Vasilios
    et al.
    Swerea - Swecast.
    Diaconu, Lucian V
    University of Miskolc, Material science and engineering, dept. of Metallurgy and casting, Hungary.
    Diószegi, Attila
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Effects of Carbon Content on the Ultimate Tensile Strength in Gray Cast Iron2010In: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 649, p. 511-516Article in journal (Refereed)
  • 200.
    Frediksson, Hasse
    et al.
    Royal Institute of Technology.
    Svensson, Ingvar L
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    A Comparison Between the Growth Processes of Cast Iron by Thermal Analysis1988In: Solidification Processing of Eutectic Alloys: proceedings of a symposium, Cincinnati, Ohio; USA: The Metallurgical Society , 1988, p. 153-162Conference paper (Refereed)
1234567 151 - 200 of 675
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