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Sökning: hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Annan teknik)

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21.
  • Dordlofva, Christo (författare)
  • Qualification Aspects in Design for Additive Manufacturing : A Study in the Space Industry
  • 2020
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The aim of this research is to further the understanding of implications for product development and qualification when introducing additive manufacturing (AM) in the context of the space industry. Increased availability of AM machines and alluring potentials such as design freedom and cost-efficient product development and manufacturing has led to a rapid growth in the use of AM. However, the implementation of AM is hampered by lack of process understanding, implying uncertainties for engineers on how to design products for AM. Furthermore, the AM process chain (including e.g. post-processes) is not sufficiently developed and understood, adding further uncertainties. These uncertainties are a challenge when developing products for space applications, especially if they are critical for mission success and hence not allowed to fail. Such products and their manufacturing processes have to comply with strict requirements on verifying performance, quality, and reliability, i.e. product and process qualification. The purpose of this research is to investigate how qualification is addressed during product development in the space industry in order to find improved ways for engineers to explore the capabilities of AM to better understand its possibilities and limitations. The research is specifically focused on the use of powder bed fusion processes by companies developing and manufacturing sub-system components for space applications. It is limited to the manufacturing of components on Earth for use in space. The research approach is qualitative. Five studies provide the empirical foundation for the thesis, in which a total of four companies are included. In particular, one of the companies is studied in-depth, including a development project for a critical AM product. Individual interviews, workshops and focus groups are used for data collection. Furthermore, the in-depth study is based on a longitudinal presence at the company, providing the opportunity to gather data from project meetings and discussions. Collaborative action research with three of the companies provides a research setting to study the development of three AM products (of which the in-depth study is one) and how uncertainties related to the AM process can be addressed. Four aspects of how to address product qualification in Design for AM are deduced: (i) AM knowledge should be built through application-driven development processes, (ii) qualification should be accounted for early and to a larger extent, (iii) suitable and acceptable requirements should be defined through collaboration, and (iv) rapid manufacturing should be utilised to evaluate critical uncertainties. To support engineering teams on how to address these aspects, this thesis presents two contributions to the design field. The first is a design process utilising AM Design Artefacts (AMDAs) to identify, test and evaluate the AM-related uncertainties that are most pressing for a product. Through the iterative use of AMDAs, products designs are successively evolved, enabling a design which meets process capabilities and fulfils product requirements. The AMDA design process is part of the second contribution, a Design for Qualification framework that encourages a qualification-driven development approach for AM products. The framework includes six design tactics that provide guidance for its implementation. The tactics encourage an application-driven development process where qualification is considered early, and where successive steps are taken towards a thorough AM process chain understanding. The framework is designed based on the studied cases, and future research should focus on developing the framework and tactics further to facilitate implementation and wider applicability.
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22.
  • Dufek, Jan, 1978 (författare)
  • Building the nodal nuclear data dependences in a many-dimensional state-variable space
  • 2011
  • Ingår i: Annals of Nuclear Energy. - : Elsevier BV. - 0306-4549 .- 1873-2100. ; 38:7, s. 1569-1577
  • Tidskriftsartikel (refereegranskat)abstract
    • We present new methods for building the polynomial-regression based nodal nuclear data models. Thedata models can reflect dependences on a large number of state variables, and they can consider varioushistory effects. Suitable multivariate polynomials that approximate the nodal data dependences are identifiedefficiently in an iterative manner. The history effects are analysed using a new sampling scheme forlattice calculations where the traditional base burnup and branch calculations are replaced by a largenumber of diverse burnup histories. The total number of lattice calculations is controlled so that the datamodels are built to a required accuracy.
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23.
  • Dufek, Jan, 1978- (författare)
  • Complex models of nodal nuclear data
  • 2011
  • Ingår i: International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2011). - 9788563688002
  • Konferensbidrag (refereegranskat)abstract
    • During the core simulations, nuclear data are required at various nodal thermal-hydraulic and fuel burnup conditions. The nodal data are also partially affected by thermal-hydraulic and fuel burnup conditions in surrounding nodes as these change the neutron energy spectrum in the node. Therefore, the nodal data are functions of many parameters (state variables), and the more state variables are considered by the nodal data models the more accurate and flexible the models get. The existing table and polynomial regressionmodels, however, cannot reflect the data dependences on many state variables. As for the table models, the number of mesh points (and necessary lattice calculations) grows exponentially with the number of variables. As for the polynomial regression models, the number of possible multivariate polynomials exceeds the limits of existing selection algorithms that should identify a few dozens of the most important polynomials. Also, the standard scheme of lattice calculations is not convenient for modelling the data dependences on various burnup conditions since it performs only a single or few burnup calculations at fixed nominal conditions. We suggest a new efficient algorithm for selecting the most important multivariate polynomials for the polynomial regression models so that dependences on many state variables can be considered. We also present a new scheme for lattice calculations where a large number of burnup histories are accomplished at varied nodal conditions. The number of lattice calculations being performed and the number of polynomials being analysed are controlled and minimised while building the nodal data models of a required accuracy.
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28.
  • Engström, Olof, 1943 (författare)
  • Limitations in future high-k materials
  • 2009
  • Ingår i: NANOSIL Workshop at ESSDERC, Athens, Sept. 14 - 18, 2009 (Invited).
  • Konferensbidrag (refereegranskat)
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29.
  • Engström, Tomas, 1950, et al. (författare)
  • Alternativ montering
  • 2008
  • Ingår i: Chukyo Keiei Kenkyu (academic japanese journal). ; 18:1, s. 73 - 153
  • Tidskriftsartikel (refereegranskat)abstract
    • A translation into Japanese of the three authors’’ book written for and financed by the Swedish Metal Workers Union (IF Metall is Swedish). Namely, “Alternativ montering. Principer och erfarenheter från fordonsindustrin”, Engström, Jonnsson and Medbo 2005). Which was financed by this organization (i.e. Metall), and which summarizes the authors’’ insights and experiences in more popular terms (used for this organization’s education, as well as made available on their website) (see other publications registered in Chalmers Public library CPL).
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30.
  • Engström, Tomas, 1950, et al. (författare)
  • Alternatives to Line Assembly: Some Swedish examples
  • 1996
  • Ingår i: International Journal of Industrial Ergonomics. - 1872-8219 .- 0169-8141. ; 17:3, s. 235-245
  • Tidskriftsartikel (refereegranskat)abstract
    • In recent years, some criticism of Lean production has occurred, focusing among other things on the working conditions and the susceptibility of traditional assembly work in a society upgrading the demands for a more humanized work. Recently, this criticism has also concerned the technical aspects of this type of manufacturing. Because of this, alternatives to line assembly merit some attention. Experiences from some innovative production systems operated in the Swedish automotive industry during the last two decades are of particular interest. These unconventional production systems feature autonomous work groups and extended work cycles. These types of production systems are elucidated in detail by means of e.g nuance the concept of utilising buffers, i.e. there are different types of buffers (or buffer functions) as is classified (or clarified) in this publications.
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