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  • 1.
    Ahlman, Per-Arne
    Linköping University, Department of Mechanical Engineering, Machine Design.
    Smörjning Av Lager2009Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

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

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

     

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

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

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

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

  • 2.
    Amadori, Kristian
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    Lundén, Björn
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Using CAD-Tools and Aerodynamic Codes in a Distributed Conceptual Design Framework2007In: Aerospace Sciences Meeting and Exhibit,2007, USA: AIAA , 2007Conference paper (Refereed)
    Abstract [en]

    Aircraft design is an inherently multi-disciplinary activity that requires different models and tools for various aspects of the design. At Linköping University a novel design framework is being developed to support the initial conceptual design phase of a new aircraft. Different modules are included, each one addressed to analyze and evaluate different aspects of the airplane, such as its aerodynamics, its weight and structure, its sub systems and its performances. All modules are easily accessible from a user-friendly interface based on an Excel spreadsheet. The link between all modules is based on Service Oriented Architecture (SOA) and allows both distribution and integration of all functions. This paper will present the framework, give an overview of its development status and give an indication on the future work.

  • 3. Andersson, J.
    et al.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Wallace, D.
    Multiobjective Optimization of Hydraulic Actuation Systems2000In: ASME Design automation conference,2000, 2000Conference paper (Other academic)
    Abstract [en]

       

  • 4.
    Andersson, Johan
    et al.
    Maskinkonstruktion Tekniska fakultetet i Linköping.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    A multi-objective optimization approach to aircraft preliminary design2003In: World Aviation Congress,2003, Montreal, Canada: SEA , 2003Conference paper (Refereed)
  • 5.
    Andersson, Johan
    et al.
    Maskinkonstruktion Tekniska fakulteten.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Metamodel Representations for Robustness Assessment in Multiobjective Optimization2001In: The International Conference on Engineering Design ICED 01,2001, Glasgow, UK: ICED 01 , 2001Conference paper (Refereed)
    Abstract [en]

      

  • 6.
    Andersson, Johan
    et al.
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Multiobjective optimization of mixed variable design problems2001In: Evolutionary Multi-Criterion Optimization First International Conference, EMO 2001 Zurich, Switzerland, March 7–9, 2001 Proceedings / [ed] Eckart Zitzler, Lothar Thiele, Kalyanmoy Deb, Carlos Artemio Coello Coello and David Corne, Springer Berlin/Heidelberg, 2001, Vol. 1993, p. 624-638Chapter in book (Refereed)
    Abstract [en]

    In this paper, a new multiobjective genetic algorithm is employed to support the design of a hydraulic actuation system. First, the proposed method is tested using benchmarks problems gathered from the literature. The method performs well and it is capable of identifying multiple Pareto frontiers in multimodal function spaces. Secondly, the method is applied to a mixed variable design problem where a hydraulic actuation system is analyzed using simulation models. The design problem constitutes of a mixture of determining continuous variables as well as selecting components from catalogs. The multi-objective optimization results in a discrete Pareto front, which illustrate the trade-off between system cost and system performance.

  • 7.
    Andersson, Johan
    et al.
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Redhe, Marcus
    Linköping University, Department of Mechanical Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
    Response surface methods and pareto optimization in crashworthiness design2003In: Proceedings of Design Engineering Technical Conferences and Computers and Information in Engineering Conference/Design Automation Conference: Volume 2: 29th Design Automation Conference, Parts A and B, Chicago, USA: ASME , 2003, p. 473-479Conference paper (Refereed)
    Abstract [en]

    This paper presents a method where a multi objective optimization techniqueis used together with response surface methods in order to support crashworthiness design. As in most engineering design problems thereare several conflicting objectives that have to be considered when formulating a design problem as an optimization problem. Here this is exemplified by the desire to minimize the intrusion into the passenger compartment area and simultaneously obtain low maximum acceleration during vehicle impact. These two objectives are naturally conflicting, since low maximum acceleration implies large intrusion. The contribution of thispaper is to show a successful application of a set of existing methods to solve a real world engineering problem.The paper also presents methods of illustrating the results obtained from the multi-objective optimization.

  • 8.
    Björn, Johansson
    et al.
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Ölvander, Johan
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Pettersson, Marcus
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Component Based Modelling And Optimization For Modular Robot Design2007In: ASME Design Automation Conferance,2007, Las Vegas: ASME , 2007, p. 911-920Conference paper (Refereed)
    Abstract [en]

    In this paper, an approach for modular design of industrial robots is presented. The approach is to introduce an objectoriented simulation model of the robot and combine this with a discrete optimization algorithm. The simulation model of the industrial robot is developed in Modelica, an object oriented modeling and simulation language, and simulated in the Dymola tool. The optimization algorithm used is a modification of the Complex method that has been developed in Matlab and connected to the simulation program. The optimization problem includes selecting components such as gearboxes and motors from a component catalogue and the objective function considers minimization of cost with constraints on gear box lifetime. Furthermore, the correctness of the model has been verified by comparison with an in-house simulation code with high accuracy.

  • 9.
    Derelöv, Micael
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    On conceptual design reliability: an approach for identification of potential failures2004Licentiate thesis, monograph (Other academic)
    Abstract [en]

    This thesis is the result of research in the area of Evaluation and Decision-Making in the Design Process. It examines how to support and facilitate the evaluation activities in the design process in order to create a more solid foundation on which to base design decisions. The focus, however, is not on decision-making in general, but primarily on how the technical feasibility and reliability of a conceptual solution may be estimated with a higher degree of certainty.

    The current tools and methods for determine the feasibility and reliability are mostly passive, i.e. they prescribe how to proceed and do not actively contribute to the result. There is need for tools and methods that take a more active part in the process, and that may convey experience about feasibility and reliability from former designs.

    The objectives with this research are to acquire knowledge about how and in what ways failures occur in a product and how they may be modelled in order to increase the understanding of them; and to develop a methodology that utilises the knowledge about the failure phenomena in order to identify and avoid problems in the solutions.

    The research approach is mainly explorative and is based on several case studies and observations. In the case studies, the failure phenomena are examined both qualitatively and quantitatively from different perspectives. In the observations, insight and experience in the usability and shortcomings of prevalent evaluation and reliability methods are gathered.

    The results may be divided into two parts, one descriptive and one prescriptive part. The descriptive result consists of a phenomena model capable of explaining the appearance of failures in a system. The phenomena model is based on the results and the conclusions from the case studies and the observations, and has given rise to an enhanced system model. The main conclusion from the descriptive part is that the detection of potential failures in a system is largely a question of identifying the potentials for different physical phenomenon to occur in the system, and to determine which effects the physical phenomenon will give rise to.

    The prescriptive results consist mainly of an information model for failure identification, from which a failure identification process has been extracted. The fundamentals of the process are to describe the behaviour in the system by searching for effects from physical phenomena, and to determine how these effects affect the functionality. The process is to some extent verified by a comprehensive example.

  • 10.
    Ericson, Liselott
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems .
    Ölvander, Johan
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Palmberg, Jan-Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    En effektiv metod för att reducera flödespulsationer från variabla hydraulmaskiner2007In: Hydraulikdagar 07,2007, Linköping: Linköpings universitet , 2007Conference paper (Other academic)
    Abstract [sv]

     Den här presentationen behandlar en metod som effektivt reducerar flödespulsationer i variabla hydraulmaskiner, genom att förskjuta dödpunktens läge. Det realiseras genom att införa en fast inklinationsvinkel vinkelrätt mot den normala deplacementsvinkeln. Genom att förskjutningsvinkeln ändrar kolvarnas dödpunkt kommer förkompressionen och efterexpansionen att variera när deplacementet ändras. Tidigare arbeten visar, både teoretiskt och experimentellt, fördelarna med förskjutningsvinkeln för pumpar men inga utförligare utredningar för maskiner som arbetar både som motor och pump.

  • 11.
    Feng, Xiaolong
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design.
    Sander- Tavalley, S.
    Ölvander, Johan
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Cycle-based Robot Drive Train Optimization Utilizing SVD Analysis2008In: ASME Design Automation Conference,2007, Las Vegas: ASME , 2008, p. 903-910Conference paper (Refereed)
    Abstract [en]

    Designing a drive train for an industrial robot is a demanding task where a set of design variables need to be determined so that optimal performance is obtained for a wide range of different duty cycles. The paper presents a method where singular value decomposition (SVD) is used to reduce the design variable set. The application is a six degree of freedom serial manipulator, with nine drive train parameters for each axis and the objective is to minimize the cycle time on 122 representative design cycles without decreasing the expected lifetime of the robot. The optimization is based on a simulation model of the robot and conducted on a reduced set of the initial duty cycles and with the design variables suggested by the SVD analysis. The obtained design reduces the cycle time with 1.6% on the original design cycles without decreasing the life time of the robot.

  • 12.
    Gavel, Hampus
    et al.
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Andersson, Johan
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Quantification of the Elements in the Relationship matrix: A conceptual study of Aircraft Fuel System2004In: 42nd AIAA Aerospace Sciences Meeting and Exhibit, Reno, USA, paper AIAA-2004-0538, 2004, no AIAA-2004-0538, p. 5244-5252Conference paper (Refereed)
    Abstract [en]

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

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

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

  • 13.
    Hallberg, Peter
    et al.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Austrin, Lars
    Saab AB.
    Low Cost Demonstrator As A Mean For Rapid Product Realization With An Electric Motorcycle Application2005In: 2005 ASME International Design Engineering Technical Conferences Computers and Information In Engineering Conference - 31st Design Automation Conference, 2005: Volume 2: 31st Design Automation Conference, Parts A and B, 2005Conference paper (Other academic)
    Abstract [en]

    During the last decade, digital prototyping has become a natural part of any industrial project dealing with product development. The reasons for this differ, but the two most obvious is time saving aspects and the amount of cost effectiveness achieved when replacing the physical prototype with the cheaper digital. Time and cost are equally, or even more critical in academic projects. This paper describes the usage of a low cost demonstrator as a mean to reduce both time and cost during a product development project course as well as to guarantee educational quality. The paper also discusses the reason for using demonstrators in an industrial environment. When large product development project courses are given at educational engineering programs, they often strive for imitating a real industrial situation, trying to include all the phases and aspects of product realization. Time is of course critical in both environments, industrial and academic, but for slightly different reasons. A typical industrial project may run over several years while a large educational project-s duration is counted in months. Thus, if the course tutor wants to simulate the whole product development process, within the same project course, there are needs for means that may speed up the project without spoiling the educational message as well as the industrial authenticity.

  • 14.
    Hallberg, Peter
    et al.
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Johansson, Björn
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Redsigning Mature Products for Substainability2006Conference paper (Other academic)
    Abstract [en]

    This contribution will discuss engineering design projects with various environmental and sustainable objectives. The automotive industry is facing a major vicissitude regarding the system layouts of their products. Given the rapidly increasing demands for environmentally acceptable and sustainable vehicles, developed even faster and under increasing competition, one could expect a future, or a period of transition, where a “market pull”-situation will exact design methods more adapted for new propulsion technologies such as fuel cells, bio-fuels, hybrid configurations and so forth. When looking at two-wheeled vehicles it is also a matter of a dramatic change in the safety requirements that would affect the design process in a similar way.

    This paper presents studies made regarding development of two-wheeled vehicles with strict safety, environmental and sustainability requirements. It also describes what happens when a very mature product, such as a conventional motorcycle, undergoes dramatic changes in propulsion system and safety features and becomes technically immature, but still has to preserve its traditional values in the eyes of the consumer. Over the last two years, the Department of Mechanical Engineering at Linköping University has conducted various projects dealing with these issues using rapid, low-cost, demonstrator development together with digital models. The demonstrator is used as a vehicle to evaluate the integration of technology, as well as less tangible aspects such as ergonomics, drivability, appeal, visual impression etc. This approach has proven particularly fruitful when dealing with new technologies with a high level of innovation. The rapid nature of these projects also makes them suitable for exploring digital collaboration tools aimed at controlling and speeding up the design process.

  • 15.
    Johansson, Björn
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Computational Methods Applied to Modelica Simulation Models in a Web Based Framework2005In: ASME 2005 International Design Engineering Technical Conferences,2005, New York: ASME Press , 2005Conference paper (Refereed)
  • 16.
    Johansson, Björn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    DeLaurentis, D. A.
    Mavris, D. N.
    Managing design data for probabilistic evaluation of aircraft concepts2004In: International Conference of Engineering Design,2003, Stockholm, Sweden: ICED'03 , 2004Conference paper (Refereed)
  • 17.
    Johansson, Björn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Jouannet, Christopher
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Distributed aircraft analysis using web service technology2004In: The World Aviation Congress,2003, Montreal, Canada: World Aviation Congress , 2004Conference paper (Refereed)
  • 18.
    Johansson, Björn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    A newservice approach for model integration in computational design2004In: Computers and Information in Engineering Conference,2003, Chicago, USA: ASME , 2004Conference paper (Refereed)
  • 19.
    Johansson, Björn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Modelica in a Distributed Environment Using Transmission Line Modelling2000In: Modelica 2000 Workshop,2000, 2000Conference paper (Other academic)
    Abstract [en]

       

  • 20.
    Johansson, Björn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Probabilistic Analysis and Design Optimization of Modelica Models2005In: 4th International Modelica Conference,2005, Hamburg: The Modelica Association , 2005, p. 247-Conference paper (Refereed)
  • 21.
    Johansson, Björn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Palmberg, Jan-Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Distrubuted Modelling: Object Oriented Implementation with Modelica and Transmission Lines2000In: Bath Workshop on Power Transmission and Motion Control, PTMC 2000,2000, 2000Conference paper (Other academic)
    Abstract [en]

      

  • 22.
    Johansson, Leif
    et al.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Wettergren, Håkan
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Computation of the pressure distribution in hydrodynamic bearings using Newton's method2004In: Journal of tribology, ISSN 0742-4787, E-ISSN 1528-8897, Vol. 126, no 2, p. 404-407Article in journal (Refereed)
    Abstract [en]

    In this paper an algorithm is developed where Reynolds' equation, equilibrium equations and non-negativity of pressure are formulated as a system of equations, which are not differentiable in the usual sense. This system is then solved using Pang's Newton method for B-differentiable equations.

  • 23.
    Johansson, Olof
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, PELAB - Programming Environment Laboratory.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Configurable Design Matrixes For Systems Engineering Applications2006In: ASME International Design Engineering Technical Conferences Computers in Engineering Conference,2006, Philadelphia, USA: ASME , 2006Conference paper (Other academic)
  • 24.
    Johansson, Per
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    On the use of visualisation tools in product design: exploring possibilities and problems of virtual reality techniques2004Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The research presented in this thesis has its base in product development methodology and examines product representations and visual displays as tools for product design. New visualisation technologies, such as VR, has entered the market, but unfortunately, questions of usability and accessibility for the designer are often set aside in favour of development of the technology itself.

    The aim with this research is to acquire knowledge about the use of, the need for and the possibilities offered by immersive visual displays and navigation means for engineering designers engaged in product design activities. The purpose is to draw up recommendations for the meaningful application of these tools, i.e. find a means of assisting the engineering designer in his everyday work. At the end of this thesis, the conclusions drawn from the findings of the research are presented as a series of guidelines to help product designers understand the possible benefits and drawbacks of introducing virtual reality techniques in their product design activities.

    The research approach is mainly explorative and is based on several studies, for example four experimental studies, an interview study and a questionnaire survey, all focusing on Swedish industry.

    The results can be divided into two categories, descriptive and prescriptive. The descriptive results concern the use of product representations and visualisation techniques in companies engaged in product development and design consulting. It was found that the overall view of these techniques is positive and has resulted in investments at a number of companies. The use of VR techniques primarily concerns tasks involving analysis, such as the assessment of product properties and early concept evaluation and selection. Its use, however, is not coherent between companies, but depends on factors such as company size, type of product, existing CAD software and a company's own traditions with regard to product representations.

    The prescriptive results primarily consist of a set of qualitative guidelines referring to different aspects of the visualisation and representation of a product-to-be. Digital product representations have been found to offer good possibilities for replacing physical mock-ups, assuming that a conscious strategy has been established for their use. The concluding guidelines include user aspects, degree of immersion, colouring, and level of detail. Together, the aspects form a basis for understanding the possible benefits and drawbacks of digital product representations - visualised for product design.

    The research has also shown that a supportive visualisation tool is not enough to be able to use VR-technology successfully. The possibility for a user to easily navigate through the virtual environment and manipulate objects therein is also an important factor. Haptics presents a means to introduce more senses for a better understanding of the product or product concepts. The use of haptics significantly improved subjects' results, compared to using a mouse, and is just as efficient as working with pen and paper, while holding additional properties of its own. This opens up for the possibility of having parts of the conceptual design stages supported by a computer environment, for more efficient handling downstream in the design process.

    List of papers
    1. Comparing digital and physical mock-ups: a study carried out in an early phase of product development
    Open this publication in new window or tab >>Comparing digital and physical mock-ups: a study carried out in an early phase of product development
    2000 (English)In: Proceedings of NordDesign 2000 / [ed] Claus Thorp Hansen, Copenhagen: Technical University of Denmark , 2000, p. 235-244Conference paper, Published paper (Refereed)
    Abstract [en]

    This paper reports on a research study that has been carried out in a medium-sized Swedish manufacturing company in order to compare the use of two different product representations as mediating objects in an early phase of product development (PD). The product representations - a physical mock-up and a digital mock-up - were used in a phase of concept evaluation, aiming at deciding upon the basic design and for the feasibility of the project.

    The paper gives a short introduction to the company, to product representations and to virtual reality technology. Virtual prototyping has been found to be an interesting possibility to improve product quality and to increase the speed of the PD process. Few reports on how VR could replace physical product representations have been found in literature, and only a few investigations showing time, money, or quality advantages using VR-technology in PD in its broad aspect are found. Therefore, impressions and feelings to a large extent still guide people to invest in the new technology.

    This paper focuses on the question whether virtual product representations can replace or complement physical product representations during PD, showing their advantages and disadvantages in different situations. The overall aim with the research is to provide a base for the development of a generic model focusing on the use of virtual reality in early phases of product development.

    Place, publisher, year, edition, pages
    Copenhagen: Technical University of Denmark, 2000
    Keywords
    product representation, virtual reality, virtual prototyping, mock-up, product development
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87842 (URN)87-90130-28-6 (ISBN)
    Conference
    NordDesign 2000, August 24-25, 2000, Copenhagen
    Available from: 2013-01-24 Created: 2013-01-24 Last updated: 2014-12-18
    2. Choosing the best visualisation tool in engineering design: comparing high-immersive VR with desktop VR
    Open this publication in new window or tab >>Choosing the best visualisation tool in engineering design: comparing high-immersive VR with desktop VR
    2001 (English)In: Proceedings of the 13th International Conference on Engineering Design / [ed] S. Culley & et Al, 2001Conference paper, Published paper (Refereed)
    Abstract [en]

    No abstract available.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87843 (URN)1-86058-354-7 (ISBN)
    Conference
    13th International Conference on Engineering Design, August 21-23 2001, Glasgow, Scotland, UK
    Available from: 2013-01-24 Created: 2013-01-24 Last updated: 2015-06-09
    3. The use of product representation in industry: a survey dealing with product development in Sweden
    Open this publication in new window or tab >>The use of product representation in industry: a survey dealing with product development in Sweden
    2001 (English)In: Strategic Knowledge and Concept Formation III / [ed] John Gero, Koichi Hori, Australia: University of Sydney , 2001Conference paper, Published paper (Refereed)
    Abstract [en]

    This paper presents the results of an inquiry into how product representations are used by industrial companies in Sweden. Consulting companies developing industrially manufactured products also participated in the study. The companies were divided into different groups, depending on number of employees, branch, and geographic location. Of special interest has been studying the adoption of new technological aids, such as virtual reality, in the product development process. In addition, product representations and their relation to product aspects and product development activities (e.g., aesthetics, ergonomics and idea testing) have been of major concern. The study shows that the examined companies made comprehensive use of various product representations for a wide range of activities. Traditional representations such as basic sketches still fulfil a need in the product development process. They are especially important in the early stages, thanks to their intuitive nature and ease of production. The use of the more recent technology, virtual reality, is still limited compared to the other types of product representations examined in the study. Most companies have the basic conditions (3D CAD) for virtual reality, but do not yet have the possibilities or need to invest in the technology.

    Place, publisher, year, edition, pages
    Australia: University of Sydney, 2001
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87844 (URN)1-86487-114-8 (ISBN)
    Conference
    3rd International Workshop on Strategic Knowledge and Concept Formation, Australia, 2001
    Available from: 2013-01-24 Created: 2013-01-24 Last updated: 2013-01-24
    4. Immersive visual interfaces: assessing usability by the effects of learning. Results from an empirical study
    Open this publication in new window or tab >>Immersive visual interfaces: assessing usability by the effects of learning. Results from an empirical study
    2004 (English)In: Journal of Computing and Information Science in Engineering, ISSN 1530-9827, E-ISSN 1944-7078, Vol. 4, no 2, p. 124-131Article in journal (Refereed) Published
    Abstract [en]

    Different immersive visual interfaces' ability to support engineering designers in product design is assessed in an experimental study. A focus was put on learning as an important factor to measure performance. Subjects were asked to find induced errors in a mechanical product using different display solutions, an Immersive Workbench, a Desktop-VR system and a Desktop system. Results show that Immersive Displays can support the designers in product development. In terms of detection times, subjects using Desktop-VR with stereoscopic glasses performed best, but difference is not significant. No difference was found between the treatments as regards the number of successful trials.

    Keywords
    Virtual Reality, Design Representations, Learning, Digital Mock-up, Man Machine Interaction, Virtual Environment, Display, Interface
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-24068 (URN)10.1115/1.1740775 (DOI)3628 (Local ID)3628 (Archive number)3628 (OAI)
    Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2017-12-13
    5. Is creativity supported by immersive visual displays and haptics? Results from an empirical study
    Open this publication in new window or tab >>Is creativity supported by immersive visual displays and haptics? Results from an empirical study
    (English)Manuscript (preprint) (Other academic)
    Abstract [en]

    This paper outlines a study that was conducted to determine in what way different computer technologies (for visualisation and navigation) can assist in a creative task which is traditionally performed using pen and paper - concept generation / concept variation. How do the different technologies relate to each other in terms of result, more specifically in number of generated concepts, diversity of concepts, novelty, usefulness etc. In other words, which technology supports human creativity most advantageously? The first important result is that the traditional tool or ''technology" for generating concepts - pen and paper - is still the most useful, quantitatively speaking.

    Keywords
    Conceptual design, virtual reality, computer supported design, creativity, product design
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87845 (URN)
    Available from: 2013-01-24 Created: 2013-01-24 Last updated: 2015-09-22
  • 25.
    Johansson, Per
    et al.
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Ynnerman, Anders
    Linköping University, Department of Science and Technology, Visual Information Technology and Applications (VITA). Linköping University, The Institute of Technology.
    Immersive visual interfaces: assessing usability by the effects of learning. Results from an empirical study2004In: Journal of Computing and Information Science in Engineering, ISSN 1530-9827, E-ISSN 1944-7078, Vol. 4, no 2, p. 124-131Article in journal (Refereed)
    Abstract [en]

    Different immersive visual interfaces' ability to support engineering designers in product design is assessed in an experimental study. A focus was put on learning as an important factor to measure performance. Subjects were asked to find induced errors in a mechanical product using different display solutions, an Immersive Workbench, a Desktop-VR system and a Desktop system. Results show that Immersive Displays can support the designers in product development. In terms of detection times, subjects using Desktop-VR with stereoscopic glasses performed best, but difference is not significant. No difference was found between the treatments as regards the number of successful trials.

  • 26.
    Jouannet, Christopher
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Andersson, Lars
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Sethson, Magnus
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Design process for micro air vehicles2003In: Bristol International UAV systems conference,2003, Bristol, UK: UAV , 2003Conference paper (Refereed)
    Abstract [en]

      

  • 27.
    Jouannet, Christopher
    et al.
    Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Aircraft manoeuvers simulation, steady and unsteady aerodynamic2003In: SAE Technical Paper, Montreal, Canada: World Aviation Congress , 2003, p. 2003-01-3034-Conference paper (Refereed)
    Abstract [en]

    The current work present a simple model to integrate non-linear aerodynamic in conceptual design phase, before wind tunnel testing. A presentation of a simple pitch up maneuver based on three different aerodynamic models is simulated. The simulation indicates different behaviors depending on the aerodynamic model, and shows the importance of including unsteady aerodynamic.

  • 28.
    Jouannet, Christopher
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    An empirical model for delta wing vortex breakdown location in sideslip condition2003In: Atmospheric flight mechanics,2003, Austin, USA: AIAA , 2003Conference paper (Refereed)
    Abstract [en]

      

  • 29.
    Jouannet, Christopher
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Direct Simulation Based Optimization for Aircraft Design Including Systems2006In: AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference,2006, Portsmouth, USA: AIAA/ISSMO , 2006Conference paper (Other academic)
  • 30.
    Jouannet, Christopher
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Sideslip effect on a series of delta wings, flow visualization results2003In: International Conference on Advanced Engineering Design,2003, Prague, Czech republic: Advanced Engineering Design , 2003Conference paper (Refereed)
    Abstract [en]

        

  • 31.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Aircraft System Optimization and Analysis for Tracebility in Design2006In: AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference,2006, Portsmouth, USA: AIAA/ISSMO , 2006Conference paper (Other academic)
    Abstract [en]

       

  • 32.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    An Information Theoretical Perspective on design2007In: International Conference on Engineering Design,2007, Paris, France: ICED'07 , 2007Conference paper (Refereed)
  • 33.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    An information theoretical perspective on performance refinement and cost2005In: ASME 2005 International Design Engineering Technical Conferences,2005, New York: ASME Press , 2005Conference paper (Refereed)
    Abstract [en]

    Design in general is about increasing the information of the product/system. Therefore it is natural to investigate the design process from an information theoretical point of view. There are basically two (although related) strains of information theory. The first is the information theory of communication. Another strain is the algorithmic theory of information. In this paper the design process is described as a information transformation process, where an initial set of requirements are transformed to a system specification. Performance and cost are both a functions of complexity and refinement, that can be expressed in information theoretical terms. The information theoretical model is demonstrated on examples. The model has implications for the balance between number of design parameters, and the degree of convergence in design optimization. Furthermore, the relationship between concept refinement and design space expansion can be viewed in information theoretical terms.

  • 34.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    An Introduction to Modelling of Transmission Lines2006Report (Other academic)
    Abstract [en]

          

  • 35.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Distributed Modelling Techniques for System Simulation2007Report (Other academic)
    Abstract [en]

      

  • 36.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Estimation models for concept optimisation of power transformation and transmission2005In: The Ninth Scandinavian International Conference on Fluid power, SICFP¿05,2005, 2005Conference paper (Other academic)
  • 37.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Post optimal system analysis using aggregated design impact matrix2000In: ASME International Design Engineering Technical Conference Computers and Information inEngineering Conference,2000, 2000Conference paper (Other academic)
  • 38.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Robust System Modelling Using Bi-lateral Delay Lines2005In: Simsafe 05,2005, 2005Conference paper (Refereed)
    Abstract [en]

    A very suitable method for modelling and simulation of large complex dynamic systems is represented by dis-tributed modelling using transmission line elements (or bi-lateral delay lines). This method evolves naturally for calculation of pressures when hydraulic pipelines are modelled with distributed parameters. It is also applicable to other physical systems, such as mechani-cal, electrical, gas etc. One interesting application for distributed solvers using bi-lateral delay lines is in real time simulation. Modelling for real-time applications puts special requirements on robustness in the numeri-cal methods used. In real-time applications there is no room for decreasing time step in numerically critical stages. Furthermore, if a system is relaying on a real-time simulation for its functionality, failure in the nu-merical properties is unacceptable.

  • 39.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    System analysis and optimization for tracebility in design2007In: The tenth Scandinavian International conference on Fluid Power,2007, Tampere, Finland: Tempare University of Technology , 2007, p. 289-Conference paper (Refereed)
    Abstract [en]

        

  • 40.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Systems Engineering and Computational Design for Aircraft Systems2004In: EWADE 2004,2004, 2004Conference paper (Refereed)
  • 41.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    The Relation Between Performance, Design Space, Refinement and Information2007In: 2007 Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, Las Vegas, Nevada, USA: ASME , 2007, p. 1005-1014Conference paper (Refereed)
    Abstract [en]

    Design in general is about increasing the information of the product/system. Therefore it is natural to investigate the design process from an information theoretical point of view. In this paper the design process is described as an information transformation process, where an initial set of requirements are transformed to a system specification. Performance and cost are both functions of complexity and refinement, which can be expressed in information entropy. There are essentially two ways of increasing the information content in a system. One is to reduce tolerances in the design parameters. The other way is to increase the design space, by introducing more features into the design. Both of these aspects of increasing information content are discussed through the establishment of a formal framework. In this way, the relationship between concept refinement and design space expansion can be viewed in information theoretical terms. The information theoretical model is demonstrated on examples. The model has practical implications for the balance between number of design parameters, and the degree of convergence in design optimization. It can also be used to give a rough estimate of number of parameters that are needed for a specified degree of accuracy in the optimization result, or the number of parameters that are meaningful to use under uncertainty.

  • 42.
    Krus, Petter
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Johansson, Björn
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Austrin, Lars
    SAAB AB.
    Concept Optimization of Aircraft Systems Using Scaling Models2004In: Recent Advances in Aerospace Actuation Systems and Components,2004, 2004Conference paper (Refereed)
  • 43.
    Krus, Petter
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Nyman, J.
    Complete aircraft system simulation for aircraft design - paradigms for modelling of complex systems2000In: International Congress of Aeronautical Sciences,2000, 2000Conference paper (Other academic)
  • 44.
    Krus, Petter
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Ölvander, Johan
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    An Information Theoretical Perspective on Design Optimizartion2004In: 2004 DETC:Design Engineering Technical Conference,2004, 2004Conference paper (Refereed)
  • 45.
    Krus, Petter
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Ölvander, Johan
    Linköping University, Department of Mechanical Engineering.
    Optimizing Optimization for Design Optimization2003In: Design Engineering Technical Conferences and Computers and Information in Engineering Conference,2003, New York: ASME Press , 2003Conference paper (Refereed)
    Abstract [en]

    Design optimization is becoming and increasingly important tool for design. In order to have an impact on the product development process it must permeate all levels of the design in such a way that a holistic view is maintained through all stages of the design. One important area is in the case of optimization based on simulation, which generally requires non-gradient methods and as a consequence direct-search methods is a natural choice. The idea in this paper is to use the design optimization approach in the optimization algorithm itself in order to produce an efficient and robust optimization algorithm. The result is a single performance index to measure the effectiveness of an optimization algorithm, and the COMPLEX-RF optimization algorithm, with optimized parameters.

  • 46.
    Krus, Petter
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Ölvander, Johan
    Linköping University, Department of Mechanical Engineering.
    Simulation Based Optimisation for Aircraft Systems2004In: SAE Transactions Journal of Aerospace, Vol. 2003, p. 445-453Article in journal (Refereed)
    Abstract [en]

    Modelling and simulation is of crucial importance for system design and optimisation. In aeronautics, simulation has been strong in the area of flight dynamics and control. Modelling and simulation of basic aircraft systems such as hydraulic systems also has a long tradition, and the rapid increase in computational power has now come to a point where complete modelling and simulation of all the sub systems in an aircraft is possible. There are several levels of design from requirement analysis and system architecture down to detail design, and there is a clear danger that systems engineering activities are performed only at the top level of a design. In order to have an impact on the product development process it must permeate all levels of the design in such a way that a holistic view is maintained through all stages of the design. This can be achieved if all design teams can work towards a common system model where the subsystem designs can be tested in an environment where the interaction with other sub-system and the whole aircraft can be studied. In this paper it is discussed how the actuation system control surfaces can be simulated and optimised using a flight dynamics model of the aircraft coupled to a model of the actuation system. In this way the system can be optimised for certain flight condition by "test flying- the system. The distributed modelling approach used, makes it possible to simulate this system much faster than real time on a 650 MHz PC. This means that even system optimisation can be performed in reasonable time.

  • 47.
    Larsson, Jonas
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    A framework for generating efficient simulation code from declarative models2004In: International Mechanical Engineering Congress,2003, Washington, DC USA: ASME , 2004Conference paper (Refereed)
  • 48.
    Larsson, Jonas
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Stability analysis of coupled simulation2004In: International Mechanical Engineering Congress,2003, Washington, DC USA: ASME , 2004Conference paper (Refereed)
  • 49.
    Larsson, Jonas
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Palmberg, Jan-Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    A tool for tracking cause-effect propagations in hydraulic systems2000In: Bath Workshop on Power and Motion Control,PTMC 2000,2000, 2000Conference paper (Other academic)
  • 50.
    Larsson, Jonas
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Palmberg, Jan-Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Concepts for Multi-Domain Modelling and Simulation2001In: Scandinavian International Conference on Fluid Power,2001, 2001Conference paper (Other academic)
12 1 - 50 of 83
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