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  • 1.
    Ericson, Åsa
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Innovation and Design.
    Larsson, Tobias
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Innovation and Design.
    Åström, Peter
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Functional product innovation: reaping the benefits of simulation driven design2007In: Knowledge Sharing and Collaborative Engineering: Proceedings of Fourth IASTED International Conference on Knowledge Sharing and Collaborative Engineering, KSCE 2006 / [ed] M. Boumedine; C. Touzet, ACTA Press, 2007Conference paper (Refereed)
    Abstract [en]

    Despite a tradition in selling and developing physical artefacts while viewing services as add-ons, the view on products in Swedish industry extends to include total offers, i.e., service provision. The service providing companies take extended long-term responsibilities regarding the physical artefact and the agreed upon functions. The changed business scenario affects product development, in particular the early phases. A life-cycle perspective, cross-company collaboration and customer needs are issues to take into consideration early on in product development. An extended enterprise business model is presented in this paper to give a notion of the changed input for product development. This is done for the purpose of discussing a simulation driven design approach in relation to a vision for functional product innovation. In an engineering design environment, computational support is commonly used to provide a basis for decisions in product development. In this paper we suggest a new, and additional, way to think about design and to use simulations. We suggest that simulations should be used to drive, and not only verify, the design of a product, and thereby also nurture innovations.

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  • 2.
    Johansson, Henrik
    et al.
    Luleå University of Technology.
    Åström, Peter
    Luleå University of Technology.
    Orsborn, Kjell
    Uppsala Database Laboratory, Department of Information Technology, Uppsala University, Uppsala, Sweden.
    A system for information management in simulation of manufacturing processes2004In: Advances in Engineering Software, ISSN 0965-9978, E-ISSN 1873-5339, Vol. 35, no 10-11, p. 725-733Article in journal (Refereed)
    Abstract [en]

    A system has been developed to manage simulation information of manufacturing processes, such as mesh information, boundary conditions and process parameters. The goal is to enable information sharing and exchange to make it possible to simulate a whole chain of manufacturing processes, and thereby predict how a modification in one manufacturing process affects the characteristics of the final product. The system has been used to predict successful simulation of a cutting process using mesh information and process parameters. An object-relational database management system is embedded in the system that uses a conceptual EXPRESS schema as database schema. The database management system is lightweight main-memory resident and incorporates an extensible and object-oriented query language. Uniform storage using database technology enables information manipulation independently of any specific simulation tool.

  • 3. Johansson, Henrik
    et al.
    Åström, Peter
    Orsborn, Kjell
    A system for information management in simulation of manufacturing processes2002In: Proceedings of the Third International Conference on Engineering Computational Technology / [ed] B.H.V. Topping; Z. Bittnar, Stirling: Civil-Comp Press , 2002, p. 131-132Conference paper (Refereed)
    Abstract [en]

    The usage of virtual prototyping has had great impact on the product development process during the last decade. It has evolved from mainly being applied to high-priced and low series products to include advanced analyses on everyday products This includes analysis of many of the processes that are performed in manufacturing of a product, such as cutting, welding and heat treatment. The focus of this project is to support the use of simulation tools for the manufacturing process with efficient information management. A system is being developed using database technology were it is possible to handle information prepared for and generated by simulation of analysis models for various types of manufacturing processes

  • 4.
    Sandberg, Marcus
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Innovation and Design.
    Larsson, Tobias
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Innovation and Design.
    Åström, Peter
    Näsström, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    A design tool integrating CAD and virtual manufacturing for distortion assessment2005In: 15th International Conference on Engineering Design - ICED 05: 15 - 28 August 2005 / [ed] Andrew Samuel; William Lewis, Barton: Institution of Engineers, Australia , 2005Conference paper (Refereed)
    Abstract [en]

    In the aero space industry, design for manufacturing promotes machining predictions using finite element analysis during design. Today design and computational engineers often are far from integrated. The design tool in this paper couples the simulation of distortion effects due to machining with CAD, where knowledge of how to perform a machining simulation is captured within the tool. The tool system is governed by a UNIX shell script and uses Python scripts for pre- and post-processing purposes coupled to the finite element software MSC.MarcTM. The tool allows an engineer to estimate the distortion effects due to machining and is believed to help bridge the gap between design and computational engineers in the manufacturing planning stages of engineering design. By using tools like the one presented here, both component quality and accuracy of machining operation cost estimation can be expected to increase, since distortion problems can be solved or prevented already in the manufacturing planning stages of engineering design. Thus design for manufacturing is enhanced since redesign due to inferior manufacturing can be reduced.

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    FULLTEXT01
  • 5. Åström, Peter
    Simulation methodologies within virtual manufacturing applied on mechanical cutting2001Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Virtual manufacturing, that is, simulation of welding, heat treatment, cutting and other manufacturing processes is becoming more and more used as a tool for prediction of material- and mechanical properties in modern industry. By simulations we refer in this case to FE-simulations of the thermo-mechanical effect of the manufacturing process on the component in question. Despite the fact that simulations are becoming more widely used, there is a lack of integration of simulations of manufacturing processes in the sense that most work focuses on an individual process being simulated. It is only when a complete chain of manufacturing processes can be simulated the real benefits, of using virtual manufacturing as a tool within product- and process development, will become evident. The thesis focuses on simulation methodologies within virtual manufacturing, and specifically methodologies for cutting simulations. Simulation of mechanical cutting has been identified as a key area where computational difficulties arise when attempting to simulate a sequence of manufacturing processes involving some form of cutting operation. A distortion problem during manufacture of a shaft front to a RM12 engine has been analysed. At one time, distortions aroused during the later stages of the cutting sequences involved in the manufacture of the shaft front. The cooling from solution heat treatment temperature and the cutting sequence was to be simulated. The result from the cooling sequence however show that the cooling does not cause residual stresses that in turn cause distortions in subsequent cutting sequences, and hence only results from the cooling procedure is presented. A test case was constructed to ensure that residual stresses would be present causing distortions during subsequent cutting. The experimental set- up with both a forming operation and subsequent cutting is used as a validation tool for the simulation of cutting using an element deactivation technique. The results show that the technique developed can be a useful tool for simulation of mechanical cutting when interested in distortions on component level. Another necessity when performing analyses of a sequence of manufacturing processes is a system for exchange of Engineering Analysis Data (EAD) between each of the simulations. Further, a system for handling the increasing amount of EAD in the product- and process development process is also needed. Most engineering software is today used to solve engineering problems within a single, limited domain. Efforts have been made to develop standardised formats such as IGES and STEP for EAD exchange both within and across domains. However, by limited implementation in commercial software the user is often forced to either program translation routines that enables data sharing or even recreate meshes, boundary conditions etc. A system has been developed that supports the management of computer-based simulation information. The paper describes how information modelling and database technologies can bring new dimensions to the effective use of engineering simulations in product- and process development.

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    FULLTEXT01
  • 6. Åström, Peter
    Simulation of manufacturing processes in product development2004Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    In the manufacture of aero engine components, three key manufacturing processes can be identified. These are welding, heat treatment and mechanical cutting. Depending on what is required in terms of mechanical- and geometrical properties in the final product these processes are typically combined in a certain sequence. It is consistently these three processes, and the modelling and simulation of them using the finite element method, that are of concern to the work presented in this thesis. Product development phases such as the detailed design phase and the process planning phase are typically simulation intensive in aerospace industry. Normally, both more extensive component and manufacturing process data are available at these stages compared to in the previous concept development phase. It is however becoming increasingly important to enable predictions of manufacturability to be made early in the product development process. Changes made in the manufacturing process chart after a product offer is released will result in an increase in cost and a decrease in profit of that component. The aim of the work presented here is thus to develop strategies and computational technologies suitable for simulation of manufacturing processes in early stages of product development. An example of a computational technology developed in this work is the method of element deactivation used to simulate distortion effects of mechanical cutting. Within the area of simulation of manufacturing processes most research work and most publications focus on one individual process being simulated. This has been of great importance for the evolution of computational methods and analysis tools used both in industry and academia. However, when the focus of using simulations often is to determine process parameters in order to obtain desired product properties in the final product, it is essential to include the entire manufacturing process sequence in these simulations. In order to enable a sequence of manufacturing processes to be simulated, engineering information data need to be transferred between simulations of the individual processes. A system for engineering information data exchange in the context of manufacturing simulations is presented in this work. An approach commonly used for concept generation is knowledge based engineering (KBE). In KBE-systems, rules are implemented that embodies the enterprises’ product- and process knowledge. In this thesis, an integrated system where mechanical cutting simulations are performed within a knowledge based engineering software framework is presented. The thesis also deals with friction modelling in the rotary friction welding process and what is appropriate, in terms of computational matters, when attempting to simulate friction welding in a concept development context. The main theme in the thesis is thus to develop strategies, methods and computational technologies suitable for simulation of manufacturing processes such as rotary friction welding and mechanical cutting in early stages of product development.

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  • 7. Åström, Peter
    The effect of convective heat transfer coefficient on the residual stresses after cooling from solution heat treatment2001In: Simulation of Materials Processing: Theory, Methods and Applications: proceedings of the 7th International Conference on Numerical Methods in Industrial Forming Processes - NUMIFORM 2001, Toyohashi, Japan, 18 - 20 June 2001 / [ed] Ken-ichiro Mori, Lisse: Balkema Publishers, A.A. / Taylor & Francis The Netherlands , 2001Conference paper (Refereed)
  • 8. Åström, Peter
    et al.
    Näsström, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Friction model parameter optimization for friction welding simulation of Ti-62462006In: Trends in welding research: proceedings of the 7th international conference : May 16-20, 2005, Callaway Gardens Resort, Pine Mountain, Georgia, USA / [ed] Stan A. David, Materials Park, Ohio: ASM International, 2006, p. 849-854Conference paper (Refereed)
    Abstract [en]

    With regard to the rotary friction welding process as used for joining of large rotationally symmetric structures in the aerospace industry, the finite element software "MSC. Marc" coupled with the optimisation code INVSYS was used to simulate the friction welding of two cylindrical titanium alloy Ti 6246 specimens while optimising parameters in the friction model. The friction model took into account the friction coefficient variation as a function of normal pressure in the contact, temperature and relative sliding velocity. The unconstrained subspace searching simplex method was employed for optimisation. An objective function was formulated to minimise the error between calculated and measured torques, and a parameter set was identified that produced better flash geometry agreement with experiment.

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