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  • 1.
    Bergström, Per
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Evaluation of NURBS Surfaces for Regular Structured Parameter Values2015In: Journal of Computing and Information Science in Engineering, ISSN 1530-9827, E-ISSN 1944-7078, Vol. 15, no 1, article id 11005Article in journal (Refereed)
    Abstract [en]

    The evaluation of surface points and derivatives of NURBS surfaces for parameter values that are regularly distributed in a rectangular structure is considered. Because of the regularity, parts of the computations can be done on just a small portion of all parameter values and computed data is stored and reused for many other parameter values. Hence, the evaluation of NURBS surfaces can be performed faster when the regularity is used. We are making a complexity analysis of the number of floating point operations, which is required for the evaluations. To get knowledge about how the evaluations perform in practice, we are doing a numerical experiment where we are measuring the runtime to obtain the output both by using ordinary evaluation of the NURBS surface and by making use of the regular structure. Making use of the regularity gives significantly faster output.

  • 2.
    Bergström, Per
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Perspective depth extraction of points on a surface under an instantaneous rigid body transformation2012In: Journal of Computing and Information Science in Engineering, ISSN 1530-9827, E-ISSN 1944-7078, Vol. 12, no 2Article in journal (Refereed)
  • 3. Bylund, Nicklas
    ADRIAN: a software for computing the stiffness of automotive joints and its application in the product development process2005In: Journal of Computing and Information Science in Engineering, ISSN 1530-9827, E-ISSN 1944-7078, Vol. 5, no 4, p. 388-393Article in journal (Refereed)
    Abstract [en]

    The development of complex mechanical structures such as a car body is an iterative process, alternating between design and analysis. Traditionally, these are made in different departments, making the loops between design and analysis slow and costly. This paper presents a method with accompanying software for the design engineer/draftsman to do preliminary mechanical analysis himself, which not only makes design loops shorter but also means they can be made in parallel. This speeds up the development process, while at the same time allowing exploration of more alternative solutions

  • 4.
    Lundin, Michael
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Lejon, Erik
    Gestamp RandD.
    Dagman, Andreas
    Product and Production Development, Chalmers University of Technology.
    Näsström, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Efficient design module capture and representation for product family reuse2017In: Journal of Computing and Information Science in Engineering, ISSN 1530-9827, E-ISSN 1944-7078, Vol. 17, no 3, article id 031002Article in journal (Refereed)
    Abstract [en]

    New business models and more integrated product development processes require designers to make use of knowledge more efficiently. Capture and reuse are means of coping, but support, techniques, and mechanisms have yet to be sufficiently addressed. This paper consequently explores how computer-aided technologies (CAx) and a computer-aided design (CAD) model-oriented approach can be used to improve the efficiency of design module capture and representation for product family reuse. The first contribution of this paper is the investigation performed at a Swedish manufacturing company and a set of identified challenges related to design capture and representation for reuse in product family development. The second contribution is a demonstrated and evaluated set of systems and tools, which exemplifies how these challenges can be approached. Efficient design capture is achieved by a combination of automated and simplified design capture, derived from the design implementation (CAD model definition) to the extent possible. Different design representations can then be accessed by the designer using the CAD-internal tool interface. A web application is an example of more generalpurpose representation to tailor design content, all of which is managed by a product lifecycle management (PLM) system. Design capture is based on a modular view block definition, stored in formal information models, management by a PLM system, for consistent and reliable design content. It was, however, introduced to support the rich and expressive forms of capture and representation required to facilitate understanding, use, and reuse of varied and increasingly complex designs. A key element in being able to describe a complex design and its implementation has been capture and representation of a set of design states. The solution has been demonstrated to effectively be able to capture and represent significant portions of a step-by-step design training material and the implementation of complex design module through a set of design decisions taken. The validity and relevance of the proposed solution is strengthened by the level of acceptance and perceived value from experienced users, together with the fact that the company is implementing parts of it today

  • 5. Pahkamaa, Andreas
    et al.
    Wärmefjord, Kristina
    Department of Product and Production Development, Chalmers University of Technology.
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Söderberg, Rikard
    Department of Product and Production Development, Chalmers University of Technology.
    Goldak, John
    Department of Mechanical and Aerospace Engineering, Carleton University, Ottawa.
    Combining variation simulation with welding simulation for prediction of deformation and variation of a final assembly2012In: Journal of Computing and Information Science in Engineering, ISSN 1530-9827, E-ISSN 1944-7078, Vol. 12, no 2Article in journal (Refereed)
    Abstract [en]

    In most variation simulations, i.e., simulations of geometric variations in assemblies, the influence from heating and cooling processes, generated when two parts are welded together, is not taken into consideration. In most welding simulations, the influence from geometric tolerances on parts is not taken into consideration, i.e., the simulations are based on nominal parts. In this paper, these two aspects, both crucial for predicting the final outcome of an assembly, are combined. Monte Carlo simulation is used to generate a number of different non-nominal parts in a software for variation simulation. The translation and rotation matrices, representing the deviations from the nominal geometry due to positioning error, are exported to a software for welding simulation, where the effects from welding are applied. The final results are then analyzed with respect to both deviation and variation. The method is applied on a simple case, a T-weld joint, with available measurements of residual stresses and deformations. The effect of the different sources of deviation on the final outcome is analyzed and the difference between welding simulations applied to nominal parts and to disturbed (non-nominal) parts is investigated. The study shows that, in order to achieve realistic results, variation simulations should be combined with welding simulations. It does also show that welding simulations should be applied to a set of non-nominal parts since the difference between deviation of a nominal part and deviation of a non-nominal part due to influence of welding can be quite large

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