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  • 301.
    Johansson, Christer
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Bergenkull, Mattias
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Gearwheel® – FEM-analys i ABAQUS samt designförslag för växlat rullstolsnav2007Independent thesis Advanced level (degree of Magister), 20 points / 30 hpStudent thesis
    Abstract [en]

    Abstract

    This master thesis considers the analysis and calculation of a modified bicycle hub, intended for a wheelchair, including design and material suggestions for the wheel.

    The initial hub was a common bicycle hub, which had been worked on to accommodate the demands of a wheelchair user. The bicycles function of free wheel is not desirable and therefore taken out of the construction. The goal of the principal Gearwheel AB is to design a wheel, where nothing else differs from the current, than the gearing system. The feel of the wheel should be identical to the current regarding the geometry, play and vibration of the grip ring.

    The gear wheel hub was assumed to be over dimensioned, and therefore analysis’s for each gear was modelled and calculated using ABAQUS. This was done for the purpose of finding alternative materials and reconstructions to minimize the weight of the hub. This was of great interest of the company for selling purposes. The hub is undoubtedly adding weight to the wheel compared to an ordinary wheel with just a single axle.

    The calculations however showed that the torque affecting the gear parts did not differ much from the bicycle, which meant that material’s strength could not be changed to a greater extent. This restricted the material choice to materials similar to the existing stainless steel or titanium. Titanium, however, is an expensive and exclusive material and the use of it was considered limited.

    The possibility of alternative materials was found in the cover of the hub, for the reason of lower strength demands than the inner parts of the hub. Therefore design suggestions were made for the entire wheel according to the common product development theories.

  • 302.
    Johansson, Christoffer
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Gustavsson, Michael
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Produktivitet i robotcell2010Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The report describes the process of identifying the interference that exists in a newly installed automated robotic cell and suggest improvements to increase productivity. The cell is used for lifting up extruded aluminum sections onto a conveyor which deliver the material to a anodising line at a company that manufactures aluminum extrusions.

    To find the areas with the best possibility for improvements in the cell we used a variety of job measurements e.g. measure of standard times for each operation in the cell. The core of the report is a study of the robots.

    One reason for this study is that the robots do not reach the productivity they were purchased to. The main cause not reaching the productivity is the visionsystem. The results that emerged from the robotics study also showed that there were a number of problems in the cell that could be addressed. The study also revealed a number of other reasons why the cell could not achieve the desired production rate for example set-up times and drop spacers. The measurement of default times for each operation in the cell showed that a major reason why the robots did not work was that they had to wait for the trolley to run and leave empty baskets.

    The time studies work resulted in a number of different proposals for how the problems which appeared could be solved. To reduce the time it takes for the wagon to drive out empty basket we engineered a solution that uses chain conveyors to move the empty basket out off the workstation. By implementing this solution the wagon does not need to drive back and forth and thus we expect that the robot driving time could be reduced to half. Through the robot study and time studies we conclude that it is possible to switch between manual/auto in less than one minute. This is not possible unless routines are constructed for the operators. If these changes are implemented they would reduce the large amount of set-up time identified.

  • 303.
    Johansson, Joel
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    A Feature and Script Based Integration of CAD and FEA to Support Design of Variant Rich Products2014In: Computer-Aided Design and Applications, ISSN 1686-4360, Vol. 11, no 5, p. 552-559Article in journal (Refereed)
    Abstract [en]

    The focus of the research presented in this article has been an integration of a CAD-system and a FEA pre-processor to automatically develop a complete FEA-models in order to make simulation based design possible. The article presents a prototype system that was developed to automate the simulation of the behavior of ski-racks mounted on cars during collision. This type of simulations requires mesh models containing structured mesh, an issue solved in the presented system and that is presented in the article. It is also shown how to make it possible to introduce contacts, loads, constraints, and other FEM-properties based on CAD-geometry.

  • 304.
    Johansson, Joel
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    A feature and script based integration of CAD and FEA to support design of variant rich products2013Conference paper (Refereed)
    Abstract [en]

    The focus of the research presented in this article has been an integration of a CAD-system and a FEA pre-processor to automatically develop a complete FEA-models in order to make simulation based design possible. The article presents a prototype system that was developed to automate the simulation of the behavior of ski-racks mounted on cars during collision. This type of simulations requires mesh models containing structured mesh, an issue solved in the presented system and that is presented in the article. It is also shown how to make it possible to introduce contacts, loads, constraints, and other FEM-properties based on CAD-geometry.

  • 305.
    Johansson, Joel
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    A flexible design automation system for toolsets for the rotary draw bending of aluminium tubes2007In: 2007 ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference: 12th Design for Manufacturing and the Life Cycle Conference (DFMLC), 2007Conference paper (Refereed)
    Abstract [en]

    For parts suppliers in the manufacturing industry, the process of preliminary production preparation and the subsequent calculation of offers are critical business activities. A vital part of production preparation is the design of fixtures and tooling necessary for many processes of metal forming. In order for a company to give quick responses to customer enquiries or changes in prior specifications, it would be highly beneficial with a degree of automation in this design process. This implies the development of a computer based system able to capture existing design procedures and associated knowledge for the classes of tooling required for the forming process.

    In this work, an implementation for the rotary draw bending of aluminum tubing has been done to exemplify how to develop an automated design system. The system is based on heuristic knowledge developed over many years of practical experience, knowledge analytically derived from fundamental theory found in scientific literature, and rules based on empirical data from trial manufacturing. The system applies knowledge to a given specification that a skilled engineer otherwise would do manually. The system output can be used to evaluate whether a tube is producible.

    The main idea behind the system is to use knowledge objects containing information on inputs, outputs, constraints and what software are used to implement the knowledge pieces. This approach makes the system highly flexible and allows for multiple types of knowledge that might overlap. When an offering calculation is wanted, the system is set to run applicable knowledge objects for presented input data. Other objects are run when an accurate calculation for detailing is wanted for a more detailed set of input data. The system is built on readily available commercial software packages connected with a simple Visual Basic .Net program.

    When building a system of this kind, it is essential that the knowledge documentation and structure be such that the functions of the system can be easily understood by the users of the system and by future developers. Aspects of user friendliness, transparency and scalability are addressed in the summary of this paper.

  • 306.
    Johansson, Joel
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Automated Computer Systems for Manufacturability Analyses and Tooling Design: Applied to the Rotary Draw Bending Process2011Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Intensive competition on the global market puts great pressure on manufacturing companies to develop and produce products that meet requirements from customers and investors. One key factor in meeting these requirements is the efficiency of the product development and the production preparation processes. Design automation is a powerful tool to increase efficiency in these two processes.

    The benefits of automating the manufacturability analysis process, a part of the production preparation process, are shortened lead-time, improved product performance, quality assurance, and, ultimately, decreased costs. Further, automation is beneficial as it increases the ability to adapt products to new product specifications with production preparations done in a few or in a single step. During the automation process, knowledge about the manufacturability analysis process is collected and stored in central systems, thus allowing full control over the design of production equipments.

    Topics addressed in this thesis include the flexibility of design automation systems, knowledge-bases containing alternative design rules, the automation of the finite element analysis process, manufacturability analysis over several productions steps, and the determination of production limits by looping the automated manufacturability analysis process. These topics are discussed in connection with the rotary draw bending of aluminum profiles.

    It is concluded that the concept of design automation can be applied to the manufacturability analysis process at different levels of automation depending on the characteristics of the implemented knowledge. The concept of object orientation should be adapted when implementing a knowledge-base and when developing the geometrical representations of the products. This makes a design automation system flexible enough to edit underlying knowledge and to extend the targeted design space. It is possible to automate the process of setting up, running, and interpreting finite element analyses to a great extent, enabling the design automation system to evaluate its own design proposals. It is also possible to enable such systems to consider sequences of manufacturing steps and loop them to develop decision support guiding engineers early in the design process, saving time and money while still assuring high product quality.

  • 307.
    Johansson, Joel
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Automated Manufacturability Analysis of the Draw Bending of Complex Aluminum Profiles2009In: ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE 2009), 2009Conference paper (Refereed)
    Abstract [en]

    Manufacturing companies are required to develop and produce products that meet increased requirements from customers and investors on shortened time spans. One key factor in meeting these requirements is the efficiency of the product development and the production preparation process. Design automation is a powerful tool to increase efficiency in these two processes. The benefits of automating the production preparation process are shortened lead-time, improved product performance, and ultimately decreased cost. Further, automation is beneficial as it increases the ability to adapt products to new product specifications with production preparations done in few or in a single step. During the automation process, knowledge about the production preparation process is collected and stored in the corporation systems, thus allowing full control over the design of production equipments.

    The contribution of this work is a method for connecting knowledge pieces implemented in auxiliary software applications using an inference engine. The knowledge pieces can control CAD-models and automatically generate, execute, and interpret finite element analyses. The presented method allows the automation of corporation know-how developed by skilled engineers over time. Further, it is possible for the resulting systems to meet criteria for good design automation systems such as low effort of developing, low level of investment, user readable and understandable knowledge, scalability, and flexibility.

    The method is exemplified by an implementation for analyzing manufacturability of the rotary draw bending of extruded sections of aluminum where the sections are complex. The output from the example system is based on established design practice and heuristic knowledge developed over many years of practical experience, rules analytically derived from fundamental physical laws, and finite element calculations. The system applies knowledge to a given specification that a skilled engineer otherwise would do manually. The method is described along with the example system in this paper.

  • 308.
    Johansson, Joel
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Automatic Producibility Analysis of the Draw Bending of Aluminium Tubes with Several Bends2009In: NAFEMS World Congress 2009: The Analysis Advantage: Perspectives on Engineering Simulation for Today and Beyond, Glasgow: NAFEMS Ltd , 2009Conference paper (Refereed)
    Abstract [en]

    Increased pressure on manufacturing companies to develop and produce products that meet tightened requirements from customers and investors on shortened time spans require increased efficiency of the product development and the production preparation. Design automation is a powerful tool to increase the efficiency in these two processes.

    The benefits of automating the production preparation process are shortened led-time, improved product performance, and ultimately decreased cost. Further, automation is beneficial as it increases the ability to adapt products to new product specifications with production preparations done in few or in a single step. During the automation process, knowledge about the production preparation process is collected and stored in company systems, thus allowing full control over the design of production equipments.

    Finite element analyses (FEA) are often used to test product properties virtually. The process of setting up FEA is many times manual and not strictly formalized; the assumptions made in those calculations highly depend on the analysts’ former experiences and gut feeling. Sometimes there exist parametric FEA-models, but they are hard to interpret for others than the developers. It is beneficial to formalize and automate the process of developing such calculations in order to automate the production preparation of mature and variant-rich products where estimations and validations using FEA are demanded in the whole or parts of the design space. Automating the FEA-process for selected production methods makes the dedicated FEA-models more flexible and more transparent. It also makes them live longer and be more available for engineers that are not FEA-specialists. The FEA-specialists will have more time to solve general problems rather than focusing on instances of the product.

    This work deal with the automation of FEA-based producibility analysis of aluminium tubes with several bends, as is a part of the production preparation of many products. The method proposed includes the usage of a KBE-system that handles knowledge objects that connect to auxiliary software applications. This is done in order to generate a design synthesis based on product specifications, to develop a geometrical model of the synthesis in a CAD-system, to generate mesh parts in a CAD-system, to set up and run a FEM-calculation based on the generated mesh, and finally to extract required results from the calculation result files. The complete process of bending the tubes several times is automatically synthesised and analysed.

  • 309.
    Johansson, Joel
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Combining Case Based Reasoning and Shape Matching Based on Clearance Analyzes to Support the Reuse of Components2012Conference paper (Refereed)
  • 310.
    Johansson, Joel
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Design Automation Systems for Production Preparation: Applied on the Rotary Draw Bending Process2008Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Intensive competition on the global market puts great pressure on manufacturing companies to develop and produce products that meet requirements from customers and investors. One key factor in meeting these requirements is the efficiency of the product development and the production preparation process. Design automation is a powerful tool to increase efficiency in these two processes.

    The benefits of automating the production preparation process are shortened led-time, improved product performance, and ultimately decreased cost. Further, automation is beneficial as it increases the ability to adapt products to new product specifications with production preparations done in few or in a single step. During the automation process, knowledge about the production preparation process is collected and stored in central systems, thus allowing full control over the design of production equipments.

    Three main topics are addressed in this thesis: the flexibility of design automation systems, knowledge bases containing conflicting rules, and the automation of the finite element analysis process. These three topics are discussed in connection with the production preparation process of rotary draw bending.

    One conclusion drawn from the research is that it is possible to apply the concept of design automation to the production preparation process at different levels of automation depending on characteristics of the implemented knowledge. In order to make design automation systems as flexible as possible, the concept of object orientation should be adapted when building the knowledge base and when building the products geometrical representations. It is possible to automate the process of setting up, running, and interpreting finite element analyses to a great extent and making the automated finite element analysis process a part of the global design automation system.

  • 311.
    Johansson, Joel
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    How to Build Flexible Design Automation Systems for Manufacturability Analysis of the Draw Bending of Aluminum Profiles2011In: Journal of manufacturing science and engineering, ISSN 1087-1357, E-ISSN 1528-8935, Vol. 133, no 6Article in journal (Refereed)
    Abstract [en]

    Manufacturingcompanies continually need to develop and produce products faster, cheaper,and of better quality to meet requirements from customers andinvestors. One key factor in meeting these requirements is theefficiency of the product development and the production preparation processes.Design automation is a powerful tool for increasing the efficiencyof these two processes. The benefits of automating manufacturability analyses,a part of the production preparation process, are shortened leadtime, improved product performance, and ultimately decreased cost. Further, theautomation is beneficial as it increases the ability to adaptproducts to new specifications since production preparations are done infew or in a single step. Extruded sections of aluminum(aluminum profiles) have many advantages, especially for light weight structuralmembers, and are used in many products. Many times asecondary forming process, such as bending, is required when thesematerials are used. The intention of the work presented inthis article has been to investigate how to automate theprocess of finding manufacturing limits of the rotary draw bendingof aluminum profiles with focus on the system architecture neededto make such systems flexible. Finding the forming limits ofan aluminum profile is not a trivial task. This isbecause the limits depend not only on the profile shapebut also on the layout of the tool. Hence, simulationshave to be done to evaluate different designs. A prototypesystem was developed to explore what was needed to automatesimulation of the rotary draw bending of aluminum profiles, andsubsequently, analyze the simulated production outcome with respect to wrinklingand developed length.

  • 312.
    Johansson, Joel
    Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Howtomation© Suite: A Novel Tool for Flexible Design Automation2015In: Transdisciplinary lifecycle analysis of systems: Proceedings of the 22nd ISPE Inc. International Conference on Concurrent Engineering, July 20–23, 2015 / [ed] Richard Curran, Nel Wognum, Milton Borsato, Josip Stjepandić, Wim J.C. Verhagen, IOS Press, 2015, p. 327-336Conference paper (Refereed)
    Abstract [en]

    This paper shows how to achieve flexibility in design automat systems through the introduction of knowledge objects and through the adoption of an oriented view of the product structure. To demonstrate the ideas a novel tool called Howtomation© Suite (for automated know-how) is presented. The new tool handles the addressed issues and has been successfully implemented at one company. That successful implementation is described at end of the paper.

  • 313.
    Johansson, Joel
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Manufacturability Analysis Using Integrated KBE, CAD and FEM2008Conference paper (Refereed)
  • 314.
    Johansson, Joel
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    André, Samuel
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Simulation ready CAD-models as a means for knowledge transfer between technology development and product development2015In: Proceedings of the International Conference on Engineering Design, ICED, Vol 6: Design Methods And Tools - Pt 2 / [ed] Weber, C; Husung, S; Cantamessa, M; Cascini, G; Marjanovic, D; Graziosi, S, Glasgow, Scottland, UK: The Design Society, 2015, Vol. 6, p. 195-205Conference paper (Refereed)
    Abstract [en]

    Manufacturing companies tend to separate technology development (TD) from product development (PD) as has been devised by research within the field of innovation management. When a technology is ready it somehow has to be made available to the PD teams so that the engineers working in PD projects can adapt the new technology into new products. The question is how that work can be supported. The ultimate goal of the research presented in this paper is to develop methods and tools to assist the knowledge transfer between TD and PD with a focus on supporting the actual use of the new technology in PD. This paper presents an industrial case along with a proposed method to achieve this. The TD and PD processes in the case company were reviewed with focus on how simulation models evolve over time and how they are used for different purposes. It was discovered that simulation ready CAD-models can be used to transfer the output from TD to PD.

  • 315.
    Johansson, Joel
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Cederfeldt, Mikael
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Interactive Case Based Reasoning through Visual Representation: Supporting the Reuse of Components in variant-rich products2012In: Proceedings of DESIGN 2012, the 12th International Design Conference, Dubrovnik, Croatia / [ed] D. Marjanovic, M. Storga, N. Pavkovic & N. Bojcetic, The Design Society, 2012, p. 1477-1485Conference paper (Refereed)
  • 316.
    Johansson, Joel
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    How to Successfully Implement Automated Engineering Design Systems: Reviewing Four Case Studies2013In: 20th ISPE International Conference on Concurrent Engineering / [ed] Cees Bil, John Mo, Josip Stjepandic, Amsterdam: IOS Press, 2013, p. 173-182Conference paper (Refereed)
  • 317.
    Johansson, Joel
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Three examples of how DSM enhances engineering design automation2013In: Proceedings of 15th International DSM Conference: Reducing Risk in Innovation, Carl Hanser Verlag GmbH, 2013, p. 3-10Conference paper (Refereed)
  • 318.
    Johansson, Joel
    et al.
    Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Poorkiany, Morteza
    Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Design Rationale Management – a Proposed Cloud Solution2014In: Advances in Transdisciplinary Engineering: Moving Integrated Product Development to Service Clouds in the Global Economy / [ed] Jianzhong Cha, Shuo-Yan Chou, Josip Stjepandić, Richard Curran, Wensheng Xu, Amsterdam: IOS Press, 2014, p. 204-214Conference paper (Refereed)
    Abstract [en]

    Due to increasing complexity of modern products it is many times impossible for single individual engineers to fully grasp the product they are a part of developing. Valuable time during the product development is therefore spent searching for knowledge about different aspect of the product. To enable engineers finding right knowledge in different situations, the knowledge must first of all exist. Secondly, it needs to be structured and thirdly, it needs to be accessible. In this paper all of these three aspects of design rationale (reasons for why the product is designed the way it is) are addressed with the main focus on the latter one, accessibility. An information model is presented that can be used to structure the design rationale. It also presents a schematic overview of how a cloud solution could be realized using the information model to make a complete system for instantly capturing, filtering and accessing design rationale in a contextual manner.

    To enable the instant and contextual capture, filtering and access of the design rationale, the design rationale management systems should be present to the engineers everywhere in the digital environment, ready for service. It should also include functions that make the design rationale shared to all privileged users making sure everyone has updated versions of the stored knowledge.

    In this work the main ideas of a method for instant and contextual capture, filtering and access of the design rationale are introduced and a pilot system described as a proof of concept. The pilot system can be used to capture, filter and access design rationale across and within text-documents, spread sheets and CAD-models.

  • 319.
    Johansson, Joel
    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.
    Automated design of rotary draw bending tools: an approach based on generic CAD-models driven by heuristic and algorithmic knowledge2006In: International conference on efficient development of manufacturing machines and processes, 2006, Wroclaw, Poland, 2006Conference paper (Refereed)
    Abstract [en]

    For parts suppliers in the manufacturing industry the process of preliminary production preparation and subsequent calculation of offers are critical business activities. A vital part of production preparation is the design of fixtures and tooling necessary for many processes of metal forming. For a company to give quick responses to customer enquiries, or changes in prior specifications, it would be highly beneficial with a degree of automation in this design process. This implies the development of a computer based system able to capture existing design procedures and associated knowledge for the classes of tooling required for the forming process.

    In this work we exemplify an automated design system for tooling by an implementation for rotary draw bending of aluminium tubing. The system is based on established design practice and heuristic knowledge developed over many years of practical experience. The system will evaluate whether a given specification is producible with existing materials and equipment, select suitable machine, determine process parameters and determine type and dimensions of components of form die, clamp die, follower or pressure die, wiper and mandrel. The system is built on readily available commercial software packages. When building a system of this kind it is essential that the knowledge documentation and structure is such that the functions of the system can be easily understood by the users of the system and by future developers. Aspects of user friendliness, transparency and scalability are addressed in the summary of this paper.

  • 320.
    Johansson, Mikael
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Magnusson, Andreas
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Stråth, Simon
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Metodikmodell för styrning vid inköp2008Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    The work with this report has been focused on developing a methodology model for control at purchase. The methodology model covers parts classification, dispatching systems, batch shaping and more. The aim with the methodology model is that it will be used as an aid for a cost effective material planning to increase the value for customer.

    The work covers also a description of the present situation and the purchase process at Company X. Six parts have been applied, two from each class (A, B and C), in the methodology/model. The parts that have been applied are included in the flow between Company X and their supplier Company Y.

    Data have been collected trough literature studies, interviews and the company’s business system. The methodology model has been developed with a broad literature study in the concerned areas.

    The application of the six parts shows that the methodology model works well and shows that there is a possibility to reduce the costs. The methodology model can also help finding news ways in the material planning.

    The conclusion can be drawn that the methodology model is a good help for material planning and that the correct control and batch shaping gives a significant cost reduction. Company X has today an effective purchase activity, but there are potentials for improvements, especially concerning the batch shaping and an increased use of kanban. Moreover there is potential to gain more with a better use of the company’s business system.

  • 321.
    Johansson, Sanna
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Mohammed, Gona
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Byte av hissbeklädnad2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Examensarbetet har utförts i sammarbete med Weland Lagersystem AB i Gislaved som är ett företag där smarta lagersystem tillverkas. Weland Lagersystem AB säljer och monterar lagerhissar som lagrar artiklar i höjdled. De här hissarna är beklädda av paneler, monteringsskenor, dekorlister och hörnprofiler. Alla beklädnadsdelar förekommer i varierande storlek. Problemet med hissarna är att beklädnaden av dem är kostsam samt att delarna för beklädnaden är många att montera.

    Målet med arbetet är att undersöka om en beklädnad i plast kan bli mer kostnads- och monteringseffektiv än dagens lösning. Om resultat av undersökningen blir negativ ska ett bättre monterings- och kostnadskoncept i plåt utvecklas. Likaså ska konstruktions- och ritningsunderlag till det resulterande konceptet  tillhandahållas Weland Lagersystem AB.

    Teoretisk referensram är ett kapitel som beskriver de olika metoderna som kommer att användas under arbetets gång. I kapitlet Metod och genomförande beskrivs hur underlaget i Teoretisk referensram har andvänts för att nå ett resultat.

    Resultatet innefattar en konceptlösning i plåt bestående av färre beklädnadsdelar än dagens lösning. Det nya konceptet bygger på en hissbeklädnad med nyutformade paneler, monteringsskenor och hörnprofiler. Kostnadskalkylerna resulterar i att lösningen blir mer kostnadseffektiv.

    Rapporten avslutats med en diskussionsdel kring resultatet gällande kostnad, montering, design och ergonomi samt förslag till vidare arbete.

  • 322.
    Jonsson, Andreas
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Persson, Linus
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Konceptkonstruktion med hjälp av topologioptimering2007Independent thesis Advanced level (degree of Magister), 20 points / 30 hpStudent thesis
    Abstract [en]

    This report documents the final project which has been performed in collaboration with Volvo 3P through the science project named Viktor. Viktor is a project which will show the opportunities with virtual product development of cast iron products. Volvo 3P is a company which among other things develops trucks. The task has been to show opportunities with topology optimization as a tool in the construction phase. This has been done with help from a case that has been received from Volvo 3P. A new concept for one of their hubs has been developed. The concept shows greater stiffness and a lower stresses compared to the original hub. The concept would probably not have been developed without using topology optimization. This report concerns the multiple steps which are used to perform optimization with the computer program Altair Hypermesh Optistruct. To verify the results which has been received from the topology optimization Abaqus has been used as a FE-tool. The report also contains the limits and difficulties which can occur during the process

  • 323.
    Jonsson, Pelle
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Andersson, Tobias
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Behov och förväntan: En analys av ett produktionskonsultföretag2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Prokon is a production consultant firm that operates in the manufacturing industry and strive to increase their client’s profits primarily through primarily work sampling. The consultant firm has a wide customer basis, which requires Prokon to work according to a generalizable model, applicable to all of their clients. Prokon work continuously with improving its firm and with that in mind they are interested in increasing their customer satisfaction.

    The purpose of the report is to analyze the customer needs, by looking at it from a production and manufacturing perspective, of what Prokon actually delivers. By doing so a stable foundation will emerge to improve internal quality work at Prokon. The report uses the company NIBE as its case study object. Interviews, study visits and general observations has been used to analyze the customer needs.

    The interviews are based on the GAP Model, which is used to find potential misinterpretations between Prokon and the case study object NIBE. Observations was performed on the work sampling techniques/methods, in order to find knowledge about the possibilities of integrating any implementation to the methods. One of the potential implementations which is brought up in this report is the PPA method, which is analyzed in order to see if it can be integrated into Prokon’s work sampling technique.

    A couple of items are brought up in the analysis of the rapport, who concerns flaws between Prokon and NIBE as partners, but also internal flaws at Prokon. The analysis can then be linked with previously documented theories to strengthen the items/theses which occurred in the analysis.

    Four suggestions of improvement arises from the analysis, who are meant to increase Prokon’s customer satisfaction and their internal working methods. Two of which concerns Prokon’s work sampling techniques, another one Prokon’s follow-up and the last one is about Prokon’s ability to customize their offer.

  • 324.
    Josefsson, Eric
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Henningsson, Henrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    A Study of Small Engine Testing2015Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Today the environmental issues are a lot on the agenda and the environmental awareness are more and more common. New laws and restrictions on engines emissions are enforced and the demand on the engines gets higher and tougher.

    This leads to the engine testing playing a more crucial part than ever.

    Engine tests are done using an engine dynamometer. The dynamometer loads the engine by, in many different ways, absorbing the power and torque generated by engine. The most important functions of a dyno are to convey the power from the engine to the dyno, to load the engine, to measure the power and torque generated by the engine and to remove the excess heat that is generated. 

    Husqvarna is a Swedish company that produces garden and forest cutting tools, their most famous products are their chainsaws.

    Husqvarna does an extensive amount of engine testing, long time testing, functional testing and field testing. Some functional tests, such as start-ability after use is done in a climate chamber where the humidity and temperature can be set. Today, loading a chainsaw in -25 °C is a problem due to the fact that the most used dynamometer at Husqvarna is a water brake that freezes in minus degrees.

    This master thesis will answer the question on how to, for small engine, simulate the load that occurs during normal use of the engine and how to develop a dynamometer suitable for Husqvarna’s needs?

    The focus when developing the dynamometer will lie on solving the problem with minus degrees and having a good detachable coupling between the dyno and the chainsaw.

    The result is a hydraulic oil dynamometer. A hydraulic pump is attached to the guide bar and chainsaw using a detachable key way coupling and bearings. By controlling restriction of the flow in the hydraulic system the load can be controlled and also ultimately the RPM of the chainsaw.

    The hydraulic oil works fine in the minus degree as long as the right oil with the right viscosity range is used although a problem with the small chainsaws are that they are not reaching the full RPM in -25 °C. Mainly because of the backpressure created by the components in the system. This can be solved by minimizing the hydraulic systems total flow restriction.  

    However this problem doesn’t affect the testing methods as long as the chainsaw easily can be disconnected and freed from the dynamometer and then be run to full RPM which the coupling between the pump and chainsaw enables.

  • 325.
    Josefsson, Johannes
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Lundberg, Marcus
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Utveckling av rattstång med övre teleskopfunktion2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this report the project team describes the outcome of the course degree project 15 ECTS (C level) performed at the program of mechanical engineering, targeted product development and design, at Jönköping University.

    The degree project has been carried out in cooperation with Kongsberg Power Products Systems AB in Ljungsarp. The aim was to develop a new type of upper telescopic function to the Kongsberg modular system for adjustable steering columns.

    The starting point of the project was to create a more ergonomic driver's environment, as Kongsberg’s customers and the market for slow vehicles are increasingly demanding.

    The requirements placed on the project consisted in the main part of the forces that construction would meet, and the axial extension of the steering column.

    To structure the work a product development methodology from the book The Mechanical Design Process by David G. Ullman has been used.

    The project has resulted in a concept that solves Kongsberg's demands for improved driver ergonomics.

  • 326.
    Kairouz, Kristian
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Qasemi, Reza
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Utveckling av styrkolonn2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 327.
    Kaldi, Kjzal
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Yousif, Nirari
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Effektivitetsbedömning av tryck- och stansmaskiner vid tillverkning av wellpapp2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 328.
    Kalidindi, Naresh
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Fardmoshiri, Mohamad
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Topology Optimization of Gear shifter Housing and Contact Benchmarks2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In automotive component design criteria such as weight, strength, stiffness, manufacturing cost are sensitive issues for boosting its performance which in turn has direct impact on fuel economy and cost.

     

    This thesis deals with the design of gear shifter housing for Volkswagen car by using modern topology optimization techniques to the existing design. gear shifter housing holds the shifting mechanism and guides the lever to select the respective gear for different speed. Optimizing the design in terms of topology, material and structural is very important in arriving at practical solution.

     

    To determine the optimum material layout distribution of material within the component with given set of loads and boundary conditions by placing a constrain on volume by minimizing sum of weighted compliance as well as maximizing lowest eigen value frequency. The process starts by applying loads to the gear shifter and constraining it in all directions thereby making the gear shifter a stiff design which can withstand loads from all direction. Boundary conditions play a major role in designing the component geometry.

     

    Contact formulation has been complex task from several years. Optimization with contact for minimizing the volume by maintaining uniform deformation between  contact surfaces between two commercial softwares, HyperWorks V10.0 and TOPO4ABQ has been compared with benchmarks.

     

    By using these techniques weight reduction has been achieved in automobile gear shifter housing and benchmarks with contact condition had been compared using Altair OptiStruct V10.0 and TOPO4ABQ by Niclas Strömberg.

     

  • 329.
    Kapanen, Gustaf
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Löf, Christer
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Inköpsoptimering och kostnadsreducering2008Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    This thesis has been carried out at Diac Metal AB at Torsvik outside of Jönköping. The company produces parts for, amongst others, office furniture and store equipment. The essay will be concentrated on one detail which is included in many of their products.

    Today the company uses an ordering quantity based on experience which is rarely updated. Furthermore the operations are performed in both the company’s own engineering workshop but also an external workshop.

    The purpose with the report has been to check whether an updating of today’s batch shaping and ordering system can mean simpler storage control and possibly cost reduction. Another part was to examine whether the operation costs could be lowered by submitting to own production or have an external workshop do it.

    The work has mainly been implemented through comparing appropriate theories from literature around these matters. Information concerning operation costs, ordering history and necessary theoretical parameters were gathered through the company’s MPS system and through the mandator.

    After the implementation it was revealed that today’s ordering system agreed good with the new system that was designed with the aid of economic order quantity and ordering system. A certain reduction of the yearly ordering costs is possible by using a larger ordering quantity. I was also revealed that the company could economize the operation costs by handing out the operations to the external workshop which has performed only one of these earlier.

  • 330.
    Kapasi, Murtaza
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Bereketeab, Nahom
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Konceptframtagning av handhållet verktyg2015Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
  • 331. Kappey, Jens
    et al.
    Schneider, Marc
    Svensson, Ingvar
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Sjölander, Emma
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Shahid, Akhtar
    Arnberg, Lars
    Microstructure, Defects and Properties in Aluminium Alloy Castings: Modelling and Simulation2010In: : Advanced methods for industrial engineering, 2010Conference paper (Other academic)
  • 332.
    Kardell, Elias
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svartz, Carl
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Konceptstudie av säte till eldriven rullstol: För Eurovema Mobility ABs modell Flexmobil i62017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta examensarbete är utfört på Jönköpings Tekniska Högskola som en examinerande del i utbildningen Maskinteknik inriktad mot produktutveckling och design. Arbetet har utförts i samarbete med Eurovema Mobility AB. Vi vill tacka vår handledare på Jönköpings Tekniska Högskola Lars Eriksson och vår handledare på företaget Vesa Järvenpää för deras bidrag till detta examensarbete.

    Vi vill även tacka alla övriga som på olika sätt har bidragit och hjälpt oss under arbetets gång. 

  • 333.
    Karlsson, Elias
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Johansson, Anders
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Produktionsutveckling för konkurrenskraft: Utformning av produktionssystemet utifrån förändrad kravbild2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Depending on the degree of integration of the manufacturing function in the company’s strategy or goals, the manufacturing system can assume a variety of different roles. In the present day, with the high level of competitiveness, it is necessary to understand how the manufacturing system shall be designed and deployed to enable and sustain a competitive manufacturing.

    The study has been performed at the company ITAB Shop Products AB (Itab), located in the city of Jönköping. Itab is a manufacturer of checkout counters, self-checkout solutions (SCO) and other smaller shop furnishings such as shelves. A decision to let the factory in Jönköping stop the manufacturing of the smaller shop furnishings, but rather to focus at the checkout counters and SCO’s, have recently been taken at the corporate level. This decision has been made in light of a prognosticated increase of demand in this segment. The goal of Itab is to become the world leading manufacturer of SCO’s. Itab finds that the present manufacturing system is not suitable to fulfil the requirements that the increase of demand, the narrowing of the product base and the company goal sets. Suggestions regarding the design of the manufacturing system is therefore requested.

    The study examines how the requirements of the market affects the manufacturing system, and what changes that could be necessary or beneficial to fulfil the requirements. The aim of the study is to contribute to a competitive manufacturing ability with respect to the change of demand and the narrowing of the product base.

    With a standpoint in a theoretical framework and a description of the present situation, the authors of this study produce a depiction of requirements and proposals regarding what strategic decisions to take concerning the manufacturing system. The depiction of requirements is described out of order winners and order qualifiers, the nature and characteristics of the products and the volume of demand. The proposals are produced within the strategic decision categories: manufacturing process, capacity, vertical integration, facility, control system, quality management system as well as organisation and workforce.

    Lastly, discussion and conclusions are made regarding the study’s implications in society, the reliability and validity of the study, the applicability of the theoretical framework, further recommendations as well as further work and research.

  • 334.
    Karlsson, Erik
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Vekariya, Nimisha
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Layoutförslag av ett företags produktionsyta2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 335.
    Karlsson, Mårten
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Conceptual Study of Hallberg-Rassy2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 336.
    Karlsson, Olof
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Strandberg, Markus
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Effektivisering av materialstyrning2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The company operates in an industry where demand can change rapidly. Therefore, the future places high demands on the company to keep its material management in shape to deliver with the right products, in due time and in the right quantity. To maintain Inwido competitive, material management needs to be streamlined.

    This thesis focuses on streamlining material management in the external material flow. It focuses on providing suggestions on how the company could improve controls for the inventory to solve issues that cause interference in the material flow. The thesis emphasizes ABC classification, which is a method to categorize the supply items in order to place an appropriate service level. When the service level is set for each category, the fluctuation stock is dimensioned to maintain that service level for each supply item.

    The thesis charts the turnover of the external material flow, which will facilitate the company's handling of purchases and lot sizing. The purpose is to reduce tied up capital and lower the lead times, which will minimize costs and increase revenues.

    In the conclusion of the thesis, it appears that by using an ABC analysis it is possible to meet the goals that the company previously set. The objectives can be met by applying methods we recommend for lot sizing and material management. The thesis presents a proposal whereby it is possible to lower the capital bond by 18.7% while fulfilling a 97% service level for material stocks that hold external articles.

  • 337.
    Karlsson, Per-Johan
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Johannesson, Jonas
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Utveckling av en ny tillverkningslina2006Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    This report contains results of our study at CTC in Ljungby. CTC produces heating products such as boilers, heat pumps and additional products to their heating systems.

    The purpose of the report is to make a proposal how CTC will supply their new production line for heat pumps with materials. The proposal includes a production layout and a scheme for how to place the material in the production storage.

    The new production line will produce two different products and both of them have several variants. The line will also have a mixed flow, so the products can be produced in a random order. These conditions demand that the production line has great flexibility and that the material to all the variants can be stored in the production storage.

    With these conditions as input we made a layout proposal to the company. They already had an own layout, but wanted another opinion. After the proposal was made the work continued with further developing of the company layout.

    When the production layout was established we began to examine the material for the two products. During the examination we got knowledge of where in the production line the material was used and also how they stored the material today.

    With help of this information the material were placed in the production storage.

    We also decided in which packing the different components would be stored in and how many packings there would be for each component in the production storage.

  • 338.
    Karlsson, Rikard
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Återvinning av rökgaser vid asfaltstillverkning2009Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Skanska expressed a wish to investigate if it is possible to reduce the lost of energy that occurs during production of asphalt. Exhaust gas contents a lot of energy. The issue has arisen at responsible for the production. The knowledge about exhaust gas and the distribution of energy has been limited, although energy has been discussed over the years. Skanska has as objective to become a green company and therefore energy saving is of great importance, both for the environment and the economic. I focused on investigate the energy of the exhaust gas and how the energy is divided in the exhaust gas. The purpose was to create basic data for decisions-making for energy recovery.

     

    The efforts resulted in a programme in order to calculate the distribution of energy in the exhaust gas and provide Skanska with some proposal for energy-saving. The report includes two concepts for preheating of the gas mixture.

     

     

    Keywords:

    • Asphalt
    • Energy-saving
    • Enviroment
    • Exhaust gas
    • Stoichiometric
    • Heatexchanger
    • Aqueous steam
  • 339.
    Karlsson, Sebastian
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Boberg, André
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Dämpning av ljud i Shift-by-Wire växelväljare: Noise damping in a Shift-by-Wire gear shifter2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Constantly growing demands from the costumers in the Automotive industry forces the subcontractors to seek alternative ways to compete. One parameter of quality is the components tolerance against NVH(Noise, Vibraion & Harshness) aspects. Kongsbergs Automotive has developed a new gear shifter platform (Shift-by-Wire) that is sold to Alfa Romeo and used in of their car models. However, the company is not pleased with the components sound quality, therefore the main purpose of this thesis is to develope a number of concepts that is supposed to enhance these NVH-aspects.

    To get an understanding of the problem an analysis of the causes of the emitted sound has been done parallell to a product decomposition, function decomposition and a Ishikawa-diagram. Together with these methods has a litterature study been performed to get familiar with the physics of an impact and especially the emittment of noise. The concepts has been generated through a combined brainstorming and brainwriting session. A number of concepts has been developed that should reduce emitted noise. To evaluate the concepts generated has well proven methods for screening been used, such as: analysis of pros and cons, feasibility analyis and Go/No-Go.

    The definite concept uses a method that absorbs the kinetic energy induced by the user through a built-on component and an energy absorbing foam. The idéa is that the built-on component and the foam should transform more of the kinetic energy to heat energy.

    The consequenses of this study is that the company now has a fully applicable concept to evaluate the idés effectiveness regarding reduction of noise. Next step is to make a prototype and evaluate the idéa.

    Since the making of a prototype has not been done, the biggest restriction in the thesis  is that the developed concept is not evaluated regarding its effectiveness of reduction of noise.

  • 340.
    Karlström, Joakim
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Chiu, Rebecka
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    e-Go Cargobike: Ett designförslag för lastutrymmet på en eldriven lastcykel2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 341.
    Kasap, Yücel
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Optimization of the Chemical Analysis SS-EN-GJL-250 Using Casting Simulation Software2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The main purpose of the thesis work is based on achieving same mechanical properties on the three different sized bearing housings. The key mechanical property that had to be focused on was the hardness of the parts. In order to achieve this goal, chemical compositions of the parts have studied. However there were some limitations on the composition variants. Allowed variables of the compositions are silicon, nickel and copper. Due to necessity another element, Molybdenum (Mo), was also introduced. After many simulations three different compositions are proposed. Then the feasibility of results of casting simulation software investigated. And finally an optimization guideline has proposed. Chemical composition researches have carried on casting simulation software, which is called Magma5. Following the completion of the simulations phase, proposed compositions trial casted at the company. Subsequent to trial castings cast parts had tested for their hardness values. In order to bring the thesis to completion simulation outputs and trial test results had compared. With the help of a casting simulation software composition optimisation of different sized parts could be easily optimised in order to achieve same results. Many simulations are executed with different composition for the silicon, nickel, copper and molybdenum variants. It was seen that Mo additions significantly increase the mechanical properties of the parts. Nickel and copperacts similarly on the hardness values, however nickel addition reduce undercooling tendency at a greater rate. Good inoculation is vital for the parts with thin sections. Decent inoculation helps to improve the microstructure and helps to get closer results tothe simulated values. However software represents key information aboutundercooled zones on the part. Software ensures 95% to 97% correct values on hardness results.

  • 342.
    Kindbom Jonsson, Axel
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH, Industrial Engineering and Management. Jönköping University, Jönköping International Business School, JIBS Entrepreneurship Centre.
    Svedberg, Samuel
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH, Industrial Engineering and Management.
    Analys av informationsbehovet för effektivt arbete med produktion: Examensarbete 2018 i Maskinteknik, Industriell ekonomi och produktionsledning2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Research about the kind of information that gives roles in manufacturing companies the ability to make better decisions in their everyday work is a complex area. Much exploration is left to do for the scientists. Much information has been made available in conjunction with the IT era. But it turns out that development is not a par with the knowledge about how companies will utilize it in the best possible way. It can be seen that companies have a gap between what actually happens in terms of investments in information and communication technology and the knowledge about it. The information flow could be used as a competitive advantage if the problem of this gap could be mapped. Where companies can easily target information in the right time, location and form.

    The purpose of this study is to examine the information requirements at the production level in a case study company, Mastec. The report will empirically review the need through a capacity study with subsequent interviews with both case study companies and another company to achieve greater generalization. The capacity study is the proven method Productivity Potential Assessment (PPA) by Peter Almström and Anders Kinnander. The study’s strength is that it measures productivity at several different levels. To estimate a potential, the parameters are compared with Mastec’s own goals and six reference companies from previous PPA studies. After identifying a productivity potential, questions about information needs related to potential areas are addressed. The combination of a qualitative and quantitative study provides the basis for a fundamental case analysis where a critical situation is studied. Generally, the result shows a complex cluster of information needs that have similarities with both operational character and strategic character.

    The result of the first question ended in a matrix that was developed using theory of operational and strategic decisions. The information requirement in the matrix was categorized into information about material, 5S activities, quality, stock status, location, real-time information, instructions, external information and overall picture.

    In further analysis of question one and the following root cause analysis to question two, the critical situation was set to setup time. The information requirement at setup time times can be summarized into a number of points: what is the current plan; which articles are to be run; changes in the plan; measurement personnel are not available; time is spent searching for tools; time is spent looking for fixtures; time is spent searching for documents; low incentives; there are no codes for all stops; the preparation work is inadequate due to difficult planning; silent information; inadequate instructions (to see explanation for these points, see section 4.5).

  • 343. Klarbring, A
    et al.
    Lundvall, O
    Strömberg, Niclas
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Engineering mechanics and optimization.
    A flexible multi-body approach for frictional contact in spur gears2004In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 278, no 3, p. 479-499Article in journal (Refereed)
  • 344.
    Klingberg, Hans
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Stendal, Marcus
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Termisk Vattenpump2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

     

    This degree project aims at developing a concept for how to use solar energy to pump up water. The target audience is people living in areas where the functioning of the electricity and water network is absent. In these areas, the hand-powered water pump is the most common technology. The degree project's goal is to find an economically viable alternative to the time consuming hand-powered water pumps. The power comes from solar energy. Studies have shown that 90% of the hand pumps that have been installed have broken down within the first three years. This is because of an incorrect basic design that severely shortens lifetime.

    How would a simple and robust design look like? An information seeking phase about the conditions and techniques that exist in these areas, were the basis for the requirements of the concept. Because of this the authors chose a concept similar to a simple steam engine. The pump uses vaporized water, by means of concentrating sunlight to pump up water. In total, 33 different concepts were created. The concepts were filtered in three stages that resulted in a final concept. The final concept contains a reflective dish that concentrates the sunlight to a receiver where the water evaporates. The built up pressure forces up water towards the surface from a tank located below the groundwater. The system is designed to supply 25 families with 2.5 cubic meters of water a day. The pump is working during the daily 8 hours of sunshine. The system will have an expected low efficiency <5.3% which is the theoretical maximum efficiency. Further development of the system requires a detailed analysis of the situation on the ground. Tests should be performed to examine how well the technology works and how sensitive the system is to disturbances.

     

  • 345.
    Klofsten, Joel
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Karlsson Tunhult, Dennis
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    LED-konvertering och omberarbetning av frontkåpa på Husqvarna riders 300-serie2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 346.
    Kus, Ömer
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Mojtabavi, Hamed
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Redesign of a Shock Absorber Piston Using Sintering2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The main objective of this report is to re-design of a product by substituting for another manufacturing process in order to get a cheaper product with the same function and quality. The current shock absorber piston is manufactured by the machining process at Öhlins Racing AB Company. Power Metallurgy (P/M) method could be a good substitute process to meet the technical requirements of the current piston with total lower cost. In this case, the whole process of product development gets involved in designing two new pistons from base-design to final product. One design is assigned to a cheaper P/M process as called Conventional Press and Sinter. Another P/M process as called Metal Injection Molding (MIM) is considered to produce the more expensive piston. According to the design guidelines of P/M processes, the base pistons are modelled in a three dimensional environment, and then an appropriate powder metal is selected for each. Consequently, the next stage is to analyse the piston strengths by Finite Element Method under the static and dynamic loadings. Fatigue analysis is taken into consideration for the cyclic loadings, and the static strength can be assessed for the static loading mode. The results show the infinite fatigue life for two different designs, and no plastic deformation is observed during analysing of the pistons under static loading. Cost estimation is the last stage of this master thesis. Compared to the total costs for the current design, the total estimations for the whole final P/M products can prove the significant drop in the final prise for each design. Thus, environmental and financial issues are already met in achieving the new pistons in this project by saving considerably money and energy. On-going stages will be to make prototype and get them tested under the real working conditions in respect to the standards.

  • 347.
    Kvist, Peter
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Jacobsen, Andreas
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Strömtillriktare2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [sv]

    Sammanfattning

    Den här rapporten är ett arbete utfört åt IDAB WAMAC International AB. Företaget är verksamt inom branschen för packsalsutrustning och är beläget i Eksjö.

    Arbetet har gått ut på att ta fram konstruktionsprinciper för en ny strömtillriktare som ska klara av en produktionshastigt på 90 000tidningar/timma. En strömtillriktare är en enhet som sitter på, eller är integrerad i, en transportbana för tidningar och har till uppgift att centrera tidningsströmmen på banan efter olika moment i produktionen. De strömtillriktare som finns på marknaden i dag motsvarar inte fullt de krav och förväntningar som tryckerierna har med tanke på hur tidningen ska centreras och då helst när produktionshastigheten är hög.

    Det finns två typer av strömtillriktare, oscillerande bladjogger och bandjogger. Den oscillerande bladjoggern fungerar på det sättet att den med hjälp av två blad knuffar tidningen så att den centreras på banan. Bladen utför då en oscillerande rörelse med hjälp av en excenter. Bandjoggern centrerar tidningen på det sättet att den har vertikala band som är kilformade mot varandra, dessa band vibrerar och centrerar då tidningen.

    För att få reda på mer om vilka konkurrenterna är och vilka strömtillriktare de har genomfördes en konkurrentanalys. När denna analys var genomförd, med hjälp av bland annat branschorganisationen IFRA: s hemsida, så återfanns sex stycken huvudkonkurrenter. För att få reda på mer fördelar och brister med deras joggrar vände vi oss till olika tryckerier som dagligen använder sådan utrustning. Svaren som erhölls från tryckerierna var väldigt knapphändiga så analyser fick göras med hjälp av bilder och information som fanns på Internet samt patent och registreringsverket.

    För att kunna utvärdera och motivera valen av joggerfunktion, studeras några av de grundläggande orsakerna till variation av slutresultatet som friktionen mellan tidningen och transportbandet och rörelsemängdens variation med produktionshastigheten.

    IDAB WAMAC International AB:s SA-112 har ett bra resultat på centreringsarbetet vid en produktionshastighet på 40 000- 50 000tidninger/timma detta har fått vara en referens vid uträkning av styrande mekaniska delar. Detta ger klara motiveringar för valet av bandjogger framför bladjogger

    I det resultat som har framkommit syns det tydligt att mycket arbete har lagts ner på att få tidningen så styv som möjligt, däremot har det varit svårt att dimensionera de axlar som ska utföra den oscillerande rörelsen på banden, då erfarenheten inom området har varit dålig och det har saknats referensexempel på hur de vertikala banden svarar på de stötar som det får.

    En stor skillnad mellan den befintliga joggern (SA-112) och den vars konstruktionsprinciper som beskrivs i rapporten är att den tidigare är en enhet som byggs på en befintlig transportbana medan den senare har sin transportbana integrerad för bästa effekt av centreringsarbetet.

  • 348.
    Kwapisz, Krzysztof
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Gwóźdź, Marcin
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Influence of ageing process on the microstructure and mechanical properties of aluminium-silicon cast alloys - Al-9%Si-3%Cu and Al-9%Si-0.4%Mg2008Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    The aim of this thesis is to investigate the influence of ageing process on the microstructure and mechanical properties of aluminium-silicon alloys. The investigation was carried on Al-9%Si-3%Cu and Al-9%Si-0.4%Mg. To obtain different DAS with low content of oxide films and micro shrinkage, gradient solidification has been used. The specimens were treated according to T6 heat treatment.

    In this thesis it has been shown that solidification rate has great influence on mechanical properties since it controls microstructure. To reach peak level of mechanical properties different times of artificial ageing were used depending on the alloy.

    In peak value condition Yield’s Strength of alloys was 197MPa for Al-Si-Cu alloy and 243MPa for Al-Si-Mg one. These results can be compared to these presented in other papers concerning aluminium silicon alloys. Such comparison shows that when talking about potential of alloy, these results are more or less the same as in other articles in this field.

    The work was conducted within 10 weeks and for this reason not all the necessary data was collected. Further work will be conducted to obtain missing results, like overaged state for Al-Si-Cu alloy.

  • 349. Källbom, Rikard
    et al.
    Hamberg, K
    Wessén, Magnus
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Björkegren, L-E
    On the solidification sequence of ductile iron castings containing chunky graphite2005In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 413-414, p. 346-351Article in journal (Refereed)
  • 350.
    König, Mathias
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Wessén, Magnus
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Influence of alloying elements on microstructure and mechanical properties of CGI2010In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 23, no 2, p. 97-110Article in journal (Refereed)
    Abstract [en]

    The influence of alloying elements and cooling conditions on compacted graphite iron is investigated. To investigate the influence of different alloying elements a sampling cup, designed for thermal analysis, and tensile test bars were cast. A total of 19 casting trials were performed and for each of the trials three different cooling conditions were studied for both the sampling cup and the tensile test bars. Mg has a major influence on the graphite morphology and causes a substantial increase in nodularity. Cu, Si and Sn only cause minor changes in the nodularity, but on the other hand affect the mechanical properties primarily by altering the pearlite content of the material. Cr and Mo are investigated mainly with respect to their carbide promoting properties. However, no columnar white structure was found in the microstructure. The relationship between the microstructure and the thermal history caused by differences in alloying content is also studied.

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