Endre søk
Begrens søket
123 51 - 100 of 147
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 51.
    Hansbo, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Larson, Mats G.
    Department of Mathematics and Mathematical Statistics, Umeå University, Umeå, Sweden.
    Continuous/discontinuous finite element modelling of Kirchhoff plate structures in R3 using tangential differential calculus2017Inngår i: Computational Mechanics, ISSN 0178-7675, E-ISSN 1432-0924, Vol. 60, nr 4, s. 693-702Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We employ surface differential calculus to derive models for Kirchhoff plates including in-plane membrane deformations. We also extend our formulation to structures of plates. For solving the resulting set of partial differential equations, we employ a finite element method based on elements that are continuous for the displacements and discontinuous for the rotations, using (Formula presented.)-elements for the discretisation of the plate as well as for the membrane deformations. Key to the formulation of the method is a convenient definition of jumps and averages of forms that are d-linear in terms of the element edge normals.

  • 52.
    Hansbo, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Larson, Mats G.
    Umeå University.
    Larsson, Fredrik
    Chalmers University of Technology.
    Tangential differential calculus and the finite element modeling of a large deformation elastic membrane problem2015Inngår i: Computational Mechanics, ISSN 0178-7675, E-ISSN 1432-0924, Vol. 56, nr 1, s. 87-95Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We develop a finite element method for a large deformation membrane elasticity problem on meshed curved surfaces using a tangential differential calculus approach that avoids the use of classical differential geometric methods. The method is also applied to form finding problems.

  • 53.
    Hansbo, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Larson, Mats G.
    Umeå University, Sweden..
    Larsson, Karl
    Umeå universitet, Sweden..
    Cut Finite Element Methods for Linear Elasticity Problems2017Inngår i: Geometrically Unfitted Finite Element Methods and Applications: Proceedings of the UCL Workshop 2016 / [ed] Bordas, Stéphane P. A.; Burman, Erik; Larson, Mats G.; Olshanskii, Maxim A., Springer International Publishing , 2017, s. 25-63Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We formulate a cut finite element method for linear elasticity based on higher order elements on a fixed background mesh. Key to the method is a stabilization term which provides control of the jumps in the derivatives of the finite element functions across faces in the vicinity of the boundary. We then develop the basic theoretical results including error estimates and estimates of the condition number of the mass and stiffness matrices. We apply the method to the standard displacement problem, the frequency response problem, and the eigenvalue problem. We present several numerical examples including studies of thin bending dominated structures relevant for engineering applications. Finally, we develop a cut finite element method for fibre reinforced materials where the fibres are modeled as a superposition of a truss and a Euler-Bernoulli beam. The beam model leads to a fourth order problem which we discretize using the restriction of the bulk finite element space to the fibre together with a continuous/discontinuous finite element formulation. Here the bulk material stabilizes the problem and it is not necessary to add additional stabilization terms.

  • 54.
    Hansbo, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Larson, Mats G.
    Umeå University, Sweden.
    Massing, André
    Umeå University, Sweden.
    A stabilized cut finite element method for the Darcy problem on surfaces2017Inngår i: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 326, s. 298-318Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We develop a cut finite element method for the Darcy problem on surfaces. The cut finite element method is based on embedding the surface in a three dimensional finite element mesh and using finite element spaces defined on the three dimensional mesh as trial and test functions. Since we consider a partial differential equation on a surface, the resulting discrete weak problem might be severely ill conditioned. We propose a full gradient and a normal gradient based stabilization computed on the background mesh to render the proposed formulation stable and well conditioned irrespective of the surface positioning within the mesh. Our formulation extends and simplifies the Masud–Hughes stabilized primal mixed formulation of the Darcy surface problem proposed in Hansbo and Larson (2016) on fitted triangulated surfaces. The tangential condition on the velocity and the pressure gradient is enforced only weakly, avoiding the need for any tangential projection. The presented numerical analysis accounts for different polynomial orders for the velocity, pressure, and geometry approximation which are corroborated by numerical experiments. In particular, we demonstrate both theoretically and through numerical results that the normal gradient stabilized variant results in a high order scheme.

  • 55.
    Hansbo, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering. Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Larson, Mats G.
    Department of Mathematics and Mathematical Statistics, Umeå University, Sweden.
    Zahedi, Sara
    Department of Mathematics, KTH Royal Institute of Technology, Sweden.
    A cut finite element method for coupled bulk-surface problems on time-dependent domains2016Inngår i: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 307, s. 96-116Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this contribution we present a new computational method for coupled bulk-surface problems on time-dependent domains. The method is based on a space–time formulation using discontinuous piecewise linear elements in time and continuous piecewise linear elements in space on a fixed background mesh. The domain is represented using a piecewise linear level set function on the background mesh and a cut finite element method is used to discretize the bulk and surface problems. In the cut finite element method the bilinear forms associated with the weak formulation of the problem are directly evaluated on the bulk domain and the surface defined by the level set, essentially using the restrictions of the piecewise linear functions to the computational domain. In addition a stabilization term is added to stabilize convection as well as the resulting algebraic system that is solved in each time step. We show in numerical examples that the resulting method is accurate and stable and results in well conditioned algebraic systems independent of the position of the interface relative to the background mesh.

  • 56.
    Hansbo, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering. Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Larson, Mats G.
    Umeå University.
    Zahedi, Sara
    KTH Royal Institute of Technology.
    Characteristic cut finite element methods for convection–diffusion problems on time dependent surfaces2015Inngår i: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 293, s. 431-461Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We develop a finite element method for convection–diffusion problems on a given time dependent surface, for instance modeling the evolution of a surfactant. The method is based on a characteristic-Galerkin formulation combined with a piecewise linear cut finite element method in space. The cut finite element method is constructed by embedding the surface in a background grid and then using the restriction to the surface of a finite element space defined on the background grid. The surface is allowed to cut through the background grid in an arbitrary fashion. To ensure stability and well posedness of the resulting algebraic systems of equations, independent of the position of the surface in the background grid, we add a consistent stabilization term. We prove error estimates and present confirming numerical results.

  • 57.
    Hansbo, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Larson, Mats G.
    Umeå University.
    Zahedi, Sara
    KTH.
    Stabilized finite element approximation of the mean curvature vector on closed surfaces2015Inngår i: SIAM Journal on Numerical Analysis, ISSN 0036-1429, E-ISSN 1095-7170, Vol. 53, nr 4, s. 1806-1832Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The mean curvature vector of a surface is obtained by letting the Laplace--Beltrami operator act on the embedding of the surface in R^3. In this contribution we develop a stabilized finite element approximation of the mean curvature vector of certain piecewise linear surfaces which enjoys first order convergence in L^2. The stabilization involves the jump in the tangent gradient in the direction of the outer co-normals at each edge in the surface mesh. We consider both standard meshed surfaces and so-called cut surfaces that are level sets of piecewise linear distance functions. We prove a priori error estimates and verify the theoretical results numerically.

  • 58.
    Hansbo, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Larsson, Fredrik
    Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden.
    The nonconforming linear strain tetrahedron for a large deformation elasticity problem2016Inngår i: Computational Mechanics, ISSN 0178-7675, E-ISSN 1432-0924, Vol. 58, nr 6, s. 929-935Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper we investigate the performance of the nonconforming linear strain tetrahedron element introduced by Hansbo (Comput Methods Appl Mech Eng 200(9–12):1311–1316, 2011; J Numer Methods Eng 91(10):1105–1114, 2012). This approximation uses midpoints of edges on tetrahedra in three dimensions with either point continuity or mean continuity along edges of the tetrahedra. Since it contains (rotated) bilinear terms it performs substantially better than the standard constant strain element in bending. It also allows for under-integration in the form of one point Gauss integration of volumetric terms in near incompressible situations. We combine under-integration of the volumetric terms with houglass stabilization for the isochoric terms.

  • 59.
    Hansbo, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering. Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Rashid, Asim
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Salomonsson, Kent
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Least-squares stabilized augmented Lagrangian multiplier method for elastic contact2016Inngår i: Finite elements in analysis and design (Print), ISSN 0168-874X, E-ISSN 1872-6925, Vol. 116, s. 32-37Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper, we propose a stabilized augmented Lagrange multiplier method for the finite element solution of small deformation elastic contact problems. We limit ourselves to friction-free contact with a rigid obstacle, but the formulation is readily extendable to more complex situations.

  • 60.
    Hansbo, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Salomonsson, Kent
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    A discontinuous Galerkin method for cohesive zone modelling2015Inngår i: Finite elements in analysis and design (Print), ISSN 0168-874X, E-ISSN 1872-6925, Vol. 102-103, s. 1-6Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We propose a discontinuous finite element method for small strain elasticity allowing for cohesive zone modeling. The method yields a seamless transition between the discontinuous Galerkin method and classical cohesive zone modeling. Some relevant numerical examples are presented. 

  • 61.
    Hegestrand, Daniel
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    ION: Konceptuell utveckling av elcykel2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This project was conducted in collaboration with Emtes Autotech and Berge consulting with the goal to develop and design an electric pedelec for general and off-road use. The idea behind the pedelecs Is to introduce something that can both be used as a source for everyday transportation, and as a source of fun exercise. The idea behind this is to incorporate a stronger engine into the pedelec, giving it an increase in force, acceleration and speed. 

    The thesis is written in the field of industrial design and will take the reader through a typical design process. The project will start with a design brief that is formulated with the client and continue into understanding the problem by analyzing the target consumer, the market and other factors of interest. The project will then go into an ideation face that explores opportunities found during research and finish with a worked-through concept that in the end was presented as a full-scale model. 

    Methods used during the project are among others: Bootleg Bootcamp, Gannt-schedule, Functional analysis, Trend analysis, Parts breakdown structure, Competitor analysis, Image board, Brainstorming, CAD-modelling and Rapid prototyping.

  • 62.
    Heikkinen, Tim
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Johansson, Joel
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Elgh, Fredrik
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Extended CAD-models – State of Practice within Three Companies2017Inngår i: IEEM2017, International Conference on Industrial Engineering and Engineering Management, 10-13 December, 2017, Singapore, IEEE, 2017, s. 1089-1093Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Product platforms and product family design have been recognized as successful methods to enable masscustomization strategies. However, companies working with products where pre-defined product variants are not feasible require a more generic platform with re-usable components as well as engineering resources. Extended CAD-models is an approach where CAD-models are utilized as carriers of information to support re-usability of both geometric content and engineering activities, decreasing product development lead-time and enabling the definition of a product family within Engineer-To-Order business contexts. The following paper presents the approach in more detail and the results of a multi-case study where three Swedish industrial companies were interviewed. Results show that all companies store information within the CAD-models to support re-usability. Several challenges were expressed such as managing responsibilities and modeling flexible CAD-models. Future trends involve the concept, but to which extent is not clear.

  • 63.
    Heikkinen, Tim
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Johansson, Joel
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Elgh, Fredrik
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Multidisciplinary design automation – A conceptual framework for working with product model extensionsManuskript (preprint) (Annet vitenskapelig)
  • 64.
    Heikkinen, Tim
    et al.
    Jönköping University, Tekniska Högskolan, JTH, Produktutveckling. Jönköping University, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Johansson, Joel
    Jönköping University, Tekniska Högskolan, JTH, Produktutveckling. Jönköping University, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Elgh, Fredrik
    Jönköping University, Tekniska Högskolan, JTH, Produktutveckling. Jönköping University, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Multidisciplinary design automation – A conceptual framework for working with product model extensions2020Inngår i: International Journal of Agile Systems and Management, ISSN 1741-9174, Vol. 13, nr 1, s. 28-47Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Design automation can be used to support efficient information handling and knowledge processing in computer-based product modelling, as well as make possible new design exploration and optimisation capabilities. To be able to utilise and manage design automation systems over time, it is important to understand how the disciplinary methods and models are dependent on each other through the product model constituents and then how these relations should be built to support maintenance, leveraging and future reuse. Awareness of the concrete representation of relations could support the system's traceability and transparency, and depending on the chosen technique, comprehension and extendability can be affected. This paper presents a conceptual framework for how a set of product model constituents are, can and to some extent, should be extended to define relations in multidisciplinary design automation systems.

    Fulltekst tilgjengelig fra 2021-03-16 00:00
  • 65.
    Heikkinen, Tim
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Johansson, Joel
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Elgh, Fredrik
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Review of CAD-model Capabilities and Restrictions for Multidisciplinary use2017Inngår i: Proceedings of CAD'17, CAD Solutions , 2017, s. 337-341Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Product development is an iterative process, partially due to changes in both company internal and external product requirements, resulting in changes to the product under development. These changes might require recapitulation of design rationale and result in re-doing assessments and syntheses of different kinds. One way to support this work is to proactively model in such a way that as much as possible of the previous work can be re-used. Modelling for re-use can be done by documenting design rationale and formalising performed activities as design guidelines or computer scripts. To be able to find and effectively re-use design activities, the added support could be attached to or otherwise linked to the product features they relate to. This paper focuses on the native CAD-models which also has been utilized by others as carriers of information for different purposes. For instance, describes the use of annotations on CAD-models, an example is presented where both FEM and CAM specifics were added to the geometry enabling automatic FEA and blank casting geometry creation. The approach was later used to support both constraint based redesign activities and encapsulation of in-development/in-service information for throughout product lifecycle retrieval. 

  • 66.
    Heikkinen, Tim
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion. Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Stolt, Roland
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion. Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Elgh, Fredrik
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion. Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Andersson, Petter
    GKN Aerospace Sweden.
    Automated Producibility Assessment Enabling Set-Based Concurrent Engineering2016Inngår i: Transdisciplinary Engineering: Crossing Boundaries / [ed] Milton Borsato, Nel Wognum, Margherita Peruzzini, Josip Stjepandić and Wim J.C. Verhagen, IOS Press, 2016, s. 947-956Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The aero-engine industry is continuously faced with new challenging cost and environmental requirements. This forces company's, active in the industry, to work toward more fuel efficient engines with less environmental impact at a lower cost. This paper presents a method for assessing producibility of large sets of components within aircraft engines to enable a Set-Based Concurrent Engineering development approach. A prototype system has been developed aimed at enabling weldability analysis at a sub-supplier within the aero-engine industry. It is a part of a multi-objective decision support tool used in early design stages. The tool produces sets of CAD-models reaching the hundreds for different analyses, mainly focusing on performance aspects within structural analysis, aerodynamics and thermodynamics.

  • 67.
    Hjertberg, Tim
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion. Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Stolt, Roland
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion. Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Elgh, Fredrik
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion. Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Managing Dependencies in Heterogeneous Design Automation Systems2016Inngår i: Transdisciplinary Engineering: Crossing Boundaries / [ed] Milton Borsato, Nel Wognum, Margherita Peruzzini, Josip Stjepandić and Wim J.C. Verhagen, IOS Press, 2016, s. 279-288Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Increasing competition in cost efficiency, lead-times, product quality, quotation accuracy, and abilities to provide customization drives companies toward development and adoption of new methods. To re-use knowledge gained from previous projects in order to avoid producing the same knowledge again and to circumvent previously encountered obstacles is an approach which is more or less used by most companies. Utilization of Design Automation (DA) systems in the engineering design process have proven to increase process efficiency and to enable new ways of working by systematic re-use of engineering knowledge. In order to ensure system longevity, industrial practitioners and researchers have pointed at implementation and long term management as important aspects to consider during development. The systems are often built on top of commercial software and legacy systems integrated by different types of scripts and system descriptions which becomes dependent of each other in different ways. Changes made during maintenance in one of these artifacts propagates through the dependency structure making traceability and transparency key factors for keeping the system valid over time. This paper presents a description of the problem in a real industrial setting together with a suggestion of an approach, based on set-up and management of dependencies between sections inside and across different types of system components, which is aimed to aid implementation and management of DA tools. A prototype system which informs the user, of functional sections related to a functional section to be updated, have been developed. The prototype is applied on a multidisciplinary heterogeneous system environment used for simulation based knowledge build up and concept evaluations of jet engine components.

  • 68.
    Hjortman, Robin
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Ergonomics study and concept development of a wide filling knife: Master thesis in industrial design2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Painting equipment, particularly wide filling knives, is a very traditional area that has experienced limited development since the mid-century. The same applies to the view of the product. It is made formerly for men, used formerly by men in a repetitive and highly wearing manner.

    Orkla House Care, formerly Anza, is the leading professional painting tool producer in the Nordics. Their goal is to adapt their tool for a wider consumer base, focusing on amateurs.

    This industrial design project aims at modernizing the view and usage of the Anza wide filling knife with focus on ergonomics, equality and inclusivity. The developed concept is thought to create extra support for the hand through raised surfaces and is shaped to also suit users with smaller hands. The design and packaging is focused on adding value to the product and creating a modern and refined impression. Simplicity, tactility and tradition are some of the themes for the design work.

  • 69.
    Horndahl, Ludvig
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Andersson, Emil
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Utvärdering av featurebaserad modellering och direktmodellering2018Independent thesis Basic level (university diploma), 180 hpOppgave
    Abstract [en]

    The benefits of using feature-based CAD methodology and direct modelling are discussed inthe thesis. An experimental CAD study has been performed in which three different cases hasbeen modelled to get an overview of how direct modelling works in Solid Edge ST10 and to determine how the methodology could be integrated into product development. These two ways of modelling in Solid Edge are evaluated using previous research and data from thestudy to do a SWOT analysis and a Pugh matrix. Further on a comparison is made to find respective methodologies’ area of use.The experimental CAD study explores three cases in which each uses one type of product thatis investigated. The CAD models used as reference for the experiment are originally created using feature-based modelling, in the ordered module of Solid Edge. The intent is to recreate the models using direct modelling. The products of interest are created using different manufacturing processes which enables most tools in the Synchronous module to be put tothe test. Points of interests for the study is the workflow of direct modelling, to define the useand limits of Synchronous and investigate the synergy between the tools of the modules.It is concluded that direct modelling excels in certain area of operations where precision engineering can be ignored. When developing concepts for a new product, time could be savedby using the swift surface editing tool of direct modelling. When the CAD user does not need to rely on already set dimensions and is free to explore different shapes to create a 3D-model,direct modelling will come in handy due to its ability to model without taking history data into account. Direct modelling can also be used as a tool for creating redesigns of products containing complex feature trees. Cooperation between different CAD software could be strengthened using direct modelling where the need to redesign imported CAD files featuring “dead geometries” and empty history trees. These types of 3D-models, step, Parasolid’s etc can be easily modified using directmodelling in Solid Edge. Further research can be made to determine in which areas direct modeling can be applied and excel compared to the standard feature-based CAD methodology.

  • 70.
    Hussmo, Daniel
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Dammhantering vid väggsågning2017Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Vid väggsågning i betong uppkommer det mycket damm. Detta damm tas till viss del upp av det vatten som appliceras för att kyla klingan under sågning, vilket leder till en så kallad slurry. Slurryn samt dammet behöver efter avklarad sågning tas upp vilket resulterar i extra arbetsmoment för brukaren av sågen. Det största problemet här är dock det damm som inandas vilket kan leda till sjukdomar såsom silikos. Dessa sjukdomar kommer i framtiden antagligen leda till nya lagkrav kring hur dammet behöver tas hand om innan brukaren kan andas in det. Syftet med studien har därmed varit att utreda hur damm och slurry kan tas upp vid väggsågning.

    Problemet med väggsågning gentemot andra former av bearbetning i betong har varit svårigheten att täta av gentemot ytan som bearbetning sker i. I fallen med borrning är det tillexempel möjligt att sluta av området och skapa undertryck som då suger upp damm och slurry.

    För att ge en grund till konceptframtagning utfördes en observation av väggsågning för att skapa förståelse för hur dammet och slurryn beter sig under sågning. Vidare utfördes även en fallstudie för att samla data gällande hur problemet löses idag samt samla punkter från industrin gällande vilka egenskaper lösningen bör ha för att anses som attraktiv i håltagningsindustrin.

    Utifrån den insamlade empirin genererades koncept med hjälp av brainstorming samt morfologi. Dessa utvärderades sedan med Husqvarna samt med hjälp av Pughs matris där kriterierna för sållningen togs utifrån fallstudiens resultat. Resultatet här blev en pådragsenhet som fäster i klingskyddets befintliga geometrier och tar upp damm och slurry vid den punkt i klingskyddet där den största delen av damm och slurry koncentreras vid sågning.

    Efter sållningen togs en prototyp fram för att kunna verifiera att damm och slurry kunde tas upp samt för att mäta dess effektivitet. Resultatet av prototyptestet var att konceptet kunde ta upp cirka 23% av slurryn samt markant reducera det synliga dammet. Konceptet kunde därmed anses uppfylla studiens syfte, speciellt gällande dammet då dess skadliga effekter på så sätt kan reduceras.

  • 71.
    Hwang, Isabel
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    An initial study on external warning signals for Quiet Road Transport Vehicles2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The increasing number of electric and hybrid vehicles in urban areas has shown to be beneficial in reducing both air and noise pollution. However, the lack of sound when driving at low speed has negatively affected the pedestrian safety since many rely on the vehicle sound for orientation. Regulatory bodies have therefore introduced minimum sound requirements for all silent vehicles, which has resulted in a key challenge for car manufacturers to develop external warning signature sounds. The objective of this project has been to study how these signals should sound in order to fit the image of electric and hybrid vehicles and minimize noise and annoyance.

    To complete the study, five sound concepts with different characteristics and rhythms were developed using the concept generation process. In order to gain subjective impressions of the sounds, three measurement methods were utilized. The first listening test was performed to eliminate the possibility that the sound samples would be perceived variously loud in the upcoming tests. The second listening test was performed to gain information on how suitable the signals are for electric and hybrid vehicles, and the third listening test was conducted to obtain information on how much annoyance the signals contributed with. A reference signal representing an internal combustion engine was included in the tests as well.

    The results of the measurement methods showed that the sound samples with long tone sequences were more preferred than those with short tone sequences, and that the artificial approach was more popular than the sound of an internal combustion engine vehicle. It was also established that additional tests need to be performed in order to confirm that these results are valid. It was suggested that field tests should be conducted and that new sound concepts should be developed based on the results of these tests.

  • 72.
    Isaksson, Ola
    et al.
    Chalmers University of Technology, Sweden.
    Arnarsson, Ívar
    Volvo Trucks, Sweden.
    Bergsjö, Dag
    Chalmers University of Technology, Sweden.
    Catic, Amer
    Chalmers University of Technology, Sweden, Volvo Group Trucks Technology, Sweden.
    Gustafsson, Göran
    Chalmers University of Technology, Sweden.
    Kaya, Onur
    Chalmers University of Technology, Sweden.
    Landahl, Jonas
    Chalmers University of Technology, Sweden.
    Lewandovski, Christoffer
    Chalmers University of Technology, Sweden.
    Malmqvist, Johan
    Chalmers University of Technology, Sweden.
    Müller, Jakob
    Chalmers University of Technology, Sweden.
    Raja, Visakha
    GKN Aerospace Sweden, Sweden.
    Raudberget, Dag
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion. Chalmers University of Technology, Sweden.
    Stenholm, Daniel
    Chalmers University of Technology, Sweden.
    Ström, Mikael
    Swerea, Sweden.
    Trends, observations and drivers for change in systems engineering design2017Inngår i: 21st International Conference on Engineering Design (ICED17): Vol. 3: Product, Services and Systems Design / [ed] Anja Maier, Stanko Škec, Harrison Kim, Michael Kokkolaras, Josef Oehmen, Georges Fadel, Filippo Salustri, Mike Van der Loos, The Design Society, 2017, s. 201-210Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Manufactures, developing products, need to adapt and improve their practices taking advantage of technology advancements and simultaneously develop products and solutions to fit a new world. This paper discusses how societal and technological trends drive the need for change and evolution in what is called Systems Engineering Design (SED), indicating a systems view on engineering design. Through an analysis and selected examples it is argued that SED capabilities need to better address the width and complexity of design problem, takes advantages of increased computational power and sensing technologies to master future challenges. An important factor for successful deployment and change in industrial context, is the need for interactive and visual aids and easily accessible support methods. This can pave the way also for advanced SED support.

  • 73.
    Jacobson, Max
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Producibility Assessment System: Enhancing modularization, robustness and flexibility2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Developing high-end aerospace components is a complex and highly competitive business. Hence methods for decreasing lead-time, while still providing the same quality and at a lower cost, has to be developed. This thesis is conducted at Research & Technology - GKN Aerospace in Trollhättan Sweden. A multidisciplinary analysis system known internally as Engineering Workbench, forms the base for implementation of the methods and tools developed in this thesis work. The system applies set-based engineering approach to develop new components. The evaluation of the design space is performed through parametric studies to find relations between the design parameters and performance metrics of the design. The engineering workbench allows GKN to define and evaluate a large design space within a limited timeframe. This thesis will look to improve the current producibility assessment system within the EWB by increasing the robustness and flexibility of the system. This is done by re-designing the producibility analysis part system and into a modular knowledge-based system that implements various techniques to increase the robustness and flexibility of the system. The re-designed system is automated, flexible and robust and is able to perform user defined weld assessments on a various designs and provides GKN with weld producibility data.

  • 74.
    Janardhanan Pillai, Unnikrishnan Asan
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Shanmugavel, Dharani
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Parameter setting on catalytic controller: Using Design of Experiments and Scanning Electron Microscope Analysis2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This thesis work has been conducted in the Handheld Laboratory at Husqvarna AB with the purpose of finding the parameters responsible for the performance of the catalytic converters used in the test rig. The catalytic converters are used in the test rig during the long term testing of the chain saws to reduce the hydrocarbon content from the exhaust before it enters into the environment.  

    To perform this research two approaches were carried out. One with Design of Experiment (DOE) and another using Scanning Electron Microscope (SEM) analysis. In Design of Experiments parameters that are suspected to be influencing the performance of the catalytic converter were refined. Using these parameters a test plan is made with the help of statistical analysis application Minitab and the tests were carried out in the test rig. Using SEM the effects of aging and its effect on microstructure and chemical composition on the catalyst surface was analyzed.

    The results from the DoE shows that the exhaust flow, collector diameter and distance to the muffler are responsible for the collection of exhaust. Distance to the muffler and collector length are the factors affecting the conversion of the exhaust. In addition to that exhaust flow is also responsible for the duration of heating coil running time.       

    The results from the SEM analysis shows that the operating temperature is high due to which there is thermal degradation of catalyst and there is also deactivation due to fouling. Another finding is that the flow on to the catalyst is not uniformly distributed 

  • 75.
    Johannesson, Hans
    et al.
    Chalmers University of Technology, Sweden.
    Landahl, Jonas
    Chalmers University of Technology, Sweden.
    Levandowski, Christoffer
    Chalmers University of Technology, Sweden.
    Raudberget, Dag
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion. Chalmers University of Technology, Sweden.
    Development of product platforms: Theory and methodology2017Inngår i: Concurrent Engineering - Research and Applications, ISSN 1063-293X, E-ISSN 1531-2003, Vol. 25, nr 3, s. 195-211Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    There is a trend toward increased customization of goods to satisfy a wide range of customers using product platforms. However, there is an erroneous notion that product platforms can only be used to provide economic viability in production thanks to the reuse of physical components among a family of products. Yet, this is a limited perception of the potential of a product platform. In this article, an object-oriented approach to support the development of product platforms is proposed to increase efficiency through reuse and flexibility of designs among a family of products. Two modes of the platform development process are addressed: platform preparation and platform execution. Platform preparation prescribes the methods needed to model platform objects, using enhanced function-means models and set-based concurrent engineering processes. During the platform execution process, sets of design alternatives can be configured concurrently throughout the conceptual, system, and detailed phases of the platform development. Three cases illustrate how the same approach may be used in different design scenarios: design space exploration and extension, supply-chain collaboration, and configure-to-order. The approach supports system architects and design engineers in making design decisions that propel the platform development work by enabling analysis in stages where designs are immature and evaluating the goodness of the alternatives early. Ultimately, product platforms can be efficiently developed for modularity and scalability to find feasible product variants and meet the needs of a multitude of customers.

  • 76.
    Johansson, Frida
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Klarin, Johanna
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Mechanical properties of trabecular structures produced by SLM, as a function of the trabecular morphology2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Eurocoating, Italy, is a company that works in the biomedical sector. They have for a long time created prostheses from CAD files achieved from customers, and now they want to build their own expertise about the design. The thesis work was a part of a three year long collaborative research project between Eurocoating and University of Trento that was aiming to investigate the prostheses with open-porous surface and trabecular structure, created by Selective Laser Melting.

    The purpose of the thesis was to investigate and characterize 30 different trabecular structures of Ti-6Al-4V, fabricated by Selective Laser Melting. That includes investigation the effect on the morphology and porosity fraction caused by the manufacturing and the effect on mechanical and physical properties due to the different characterizations of the structures.

    The thesis work had its foundation in literature studies to receive deep knowledge about the subject. Practical tests were performed to investigate mechanical behaviour under compressive and tensile loading, static friction and wear resistance. The findings from these tests were compared to the porosity fraction and the morphological characterizations.

    The result stated that the porosity fraction was lower than the designed porosity, and that is was strongly influenced by size of the voids and struts. The strut thickness was higher than the design values, especially on the lateral surface, while the voids size were approximately as designed. Result from the compression test showed a trend of decreasing stiffness and strength with increasing porosity fraction. Also structures with same porosity fraction could have a wide range in mechanical properties which indicates high dependence on the morphological geometry i.e. pore size and shape, strut size and pore distribution. Comparisons between tensile and compression behaviour stated that the structures had a lower strength but a significant higher stiffness in tensile load. All structures from the wear test showed a good resistance while the results from the friction test needs further investigation to be fully understood.

    The physical and mechanical properties of the trabecular structures was found to be close to those of cortical and trabecular bone in porosity, stiffness and strength. There is a range of variations leading to possibilities to adopt the application depending on customer. Thus, these can be considered as promising structures used biomedical application to optimize osseointegration and secondary long term fixation.

  • 77.
    Johansson, Joel
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Analysing Engineering Knowledge in CAD-models and Spread Sheets using Graph Theory and Filtering2017Inngår i: 24th ISPE International Conference on Transdisciplinary Engineering (TE2017): Transdisciplinary Engineering: A Paradigm Shift / [ed] C. H. Chen, A. C. Trappey, M. Peruzzini, J. Stjepandic, & N. Wognum, IOS Press, 2017, s. 629-638Konferansepaper (Fagfellevurdert)
    Abstract [en]

    As the era of Knowledge Based Engineering (KBE) and design automation has evolved a big effort has been put to automate CAD-models to quick and accurately respond to changes of customer specifications. The automated knowledge in these KBE-systems is represented as sets of rules, sets that are continuously growing. Parallel to KBE-systems knowledge is also automated in spread sheets (were the cells can be viewed as rules in a KBE system).These spread sheets also tend to grow in number and complexity. The vision of reusing corporate knowledge through automating it in computer systems are now threaten by the fact that the complexity makes it hard to grasp and manage what was automated. Complexity management and graph theory are scientific fields addressing these types of problems. This paper describes how engineering knowledge stored in CAD-models and spread sheets can be analysed through the application of graph theory, visualization and filtering. Information models of CAD-models and spread sheets are developed and applied to a real industrial case to generate and analyse the content.

  • 78.
    Johansson, Joel
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Exploring design content in cad-models and knowledge bases using graph theory and filtering2017Inngår i: Machine Dynamics Research, ISSN 2080-9948, Vol. 41, nr 4, s. 5-15Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper focus on what types of relations exist within CAD-models and in KBE-systems connected to them. It describes how engineering knowledge stored in CAD-models and KBEsystems can be analysed through the application of graph theory, visualization and filtering. The paper is organised as follows: First the information models for CAD-models and KBEsystems are introduced and graph theory in connection with these information models is presented. The theory is then applied to a real case which is a CAD-model that was automated using a commercial KBE-system where the number of rules made it hard to engineers to grasp the model. By applying the concepts presented in this paper it was possible to identify critical design parameters and to inspect the logical model of the product.

  • 79.
    Johansson, Joel
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Exploring design content in cad-models and knowledge bases using graph theory and filtering2017Konferansepaper (Fagfellevurdert)
  • 80.
    Johansson, Joel
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Elgh, Fredrik
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Applying Connectivism to Engineering Knowledge to Support the Automated Business2017Inngår i: 24th ISPE International Conference on Transdisciplinary Engineering (TE2017): Transdisciplinary Engineering: A Paradigm Shift / [ed] C. H. Chen, A. C. Trappey, M. Peruzzini, J. Stjepandic, N. Wognum, IOS Press, 2017, s. 621-628Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Maintaining products in an automated business includes digitalization and automation of engineering knowledge. When new products are to be developed, and introduced not only has the production processes be automated but also the knowledge regarding how the product should be constituted depending on customer requirements. One big challenge that companies of this kind face is how to make sure that the knowledge automated still can be understood by its stakeholders during the development project and after product release and through the whole product life-cycle, which might last for decades. In this paper, we present a method to navigate and share vast amount of knowledge in businesses with high degree of automated engineering. The method is based on the connectivistic view of knowledge were network formation and filtering are two corner stones which implies the utilization of graph theory together with electronic publishing functionality.

  • 81.
    Johansson, Joel
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Elgh, Fredrik
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Automated Design Assessment as a Strategic Part of Design Platforms2017Inngår i: 24th ISPE International Conference on Transdisciplinary Engineering (TE2017): Transdisciplinary Engineering: A Paradigm Shift / [ed] C. H. Chen, A. C. Trappey, M. Peruzzini, J. Stjepandic, N. Wognum, IOS Press, 2017, s. 441-448Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents a general model for businesses to work with their engineering assessments to challenge fluctuating requirements which is the result of a recently finished research project. The model is presented together with a case study of a company with a product that continuously is and must be adapted to a changing market to be alive at all. The company has developed a streamlined development process that is configured based on current needs from time to time. One keystone to make the mass customization possible to this company is the augmented synthesis and the automated assessment of the product variants rendered through the configured development process. The automated process of making the assessments and how it connects to the general model is also presented in the paper.

  • 82.
    Johansson, Joel
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Elgh, Fredrik
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Knowledge Objects Enable Mass-Individualization2017Inngår i: EUROGEN 2017 – BOOK of Extended Abstracts / [ed] Esther Andrés, Leo González, Jacques Periaux, Nicolas Gauger, Kyriakos Giannakoglou, Domenico Quagliarella, Madrid: Technical University of Madrid , 2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Mass customization and product individualization are driving factors behind design automation, which in turn are enabled through the digitalization of engineering work. The goal is to offer customers optimized solutions to their needs timely and with as high profit as possible. The path to achieve such a remarkable goal can be very winding and tricky for many companies, or even non-existing at the moment being. To succeed requires three essential parts: digitized product knowledge, facilities to automate the digitized product knowledge, and optimization algorithms. This paper shows how these three parts can be supported in engineer-to-order businesses through the concept of knowledge objects. Two case examples are also described in the paper.

  • 83.
    Johansson, Joel
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Stolt, Roland
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    Raudberget, Dag
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion.
    An approach to capture engineering knowledge through visual evaluation of mass generated design proposals2016Inngår i: Proceedings of the DESIGN 2016 14th International Design Conference, Dubrovnik, May 16-19, 2016 / [ed] Marjanović, D., Štorga, M., Pavković, N., Bojčetić, N., Škec, S., The Design Society, 2016, s. 679-688Konferansepaper (Fagfellevurdert)
  • 84.
    Jonasson, Emelie
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Petras, Caitlin
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Visuellt tillfredställande ljusmiljöer vid nyplanerad belysning på utvalda sjukhusavdelningar2018Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Abstract

    The purpose with the report is to contribute with information around how to shape a lighting environment that support well-being. The goal is to show builders that the Swedish lighting standard SS-EN 12464-1 ​Ljus och belysning ​can be fulfilled in a more visually satisfactory manner. ​The study includes general areas of newly built and reconstructed hospitals. Observations at the hospitals take place during the day and do not take the weather into account. ​Builders for different types of projects are interviewed to get an understanding of how lighting design is handled in the construction process.

    The thesis has qualitative methodology where previous research forms the basis for the work, supplemented with observations and interviews. Collection of research on well-being and light environment is the first step in the work. Thereafter two hospitals are observed. Conclusions drawn from previous research and observations are used to make interview questions to the builders.

    Research shows that a satisfactory light environment that promotes well-being is an interplay that forms an ensemble of several factors where light is one of the factors together with architecture, air, sound, furnishing, color, and opportunity for outlook from windows as well as daylight. The two hospitals that have been observed follow to some extent what research shows how light environments should be designed after well-being. Builders think that lighting is an important part of a building and should come in at an early stage. Generally, the builder's does not possess any expertise in the area, thus taking expert assistance for best results. The builders who responded to the interviews in the projects had a basic requirement following the Swedish lighting standard SS-EN 12464-1. ​It is shown that visually satisfactory light environments that promote well-being can partly be created with Swedish lighting standard SS-EN 12464-1. Provided that a lighting designer comes in early in the construction process and may depart from the standard if necessary to create interaction with the other factors in the room that are adapted to human perception.

  • 85.
    Jungström, Pierre
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Framtagning av en belysningsarmatur anpassad för badrumsmiljö2016Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Within the lighting industry, major focus on rules and restrictions must be followed when developing luminaires. To be able to place a lighting luminaire in a wet room certain requirements must be fulfilled. These requirements are something that must be taken into account and be followed early in the product development process.

    The study was conducted in collaboration with the company Bsweden Belysningsbolaget AB (Bsweden). Bsweden expressed a desire to receive one or more proposals for products that would expand or strengthen their product variety. The product would be included in the segment “lighting luminaries that can withstand water and are suitable for bathrooms”. The purpose of this study was therefore to develop a proposal of a lighting luminaire that could withstand water and that are suitable for bathrooms.

    The methods used were literature study, case study, competitor analysis and a design process. Literature study was carried out in the following areas; lighting theory, light sources, choice of material, electrical safety and theory about the design process. The case study consisted of document study and interviews with Bsweden and with the company Intertek Semko AB. A competitor analysis of Bsweden’s nearest competitors was also conducted. All the gathered information was then used during the design process where a design requirement specification and functional analysis was created. These were used as a guideline during the design process and to develop the result of the study.

    The result contains of a product proposal consisting a stripped and timeless lighting luminaire, adapted for bathrooms. The product proposal meets Bswedens’ requirements and the requirements in the design specification and the functional analysis; therefore the purpose of the study is fulfilled.

    Because of the existing conditions, the proposed product could not be tested in reality. If a prototype of the product would been manufactured and sent to testing, the requirements for the product could be tested and the results could therefore become more reliable.

  • 86.
    Kalantari, Meisam
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Collapsible Home: Celebrate life again2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    There has been significant increase in the occurrence of earthquakes and other disasters around the world recently. With record-breaking storms and natural disasters destroying different parts of the world, many people have to deal with the repercussions of the aftermaths; and homelessness is one of the facts of such incidence. This master thesis is aimed at creating living solution for the victims of earthquakes and other kind of disasters; natural or human-made (war), providing accommodation for homeless people after an earthquake or a housing alternative for refugees. The design of the collapsible home is basically a new concept of emergency hut for accommodating people in emergency after the event of disaster with easy assembling and quick installation feature. Considering the situation of homeless people after catastrophic disasters who need to be accommodated, the design and creation of a quick, accommodating and low-cost emergency hut is advantageous.  This project also provides a living service for both refugees and homeless people. It is low cost, modular, and easy to use. More than that it is feasible and it makes it possible to accommodate people for a longer period of time, rather than a very short temporary housing solution such as tents.  

  • 87.
    Karl, Graflund
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Mikael, Palmqvist
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Framtagning av hjälpverktyg för rollermålning2016Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
  • 88.
    Karlsson, Sofie
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Kohnechian, Parisa
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Konceptframtagning för Amazing Brands: Framtagning av tre konceptförslag till XXX2016Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The beauty industry is growing and more and more companies within the fashion industry are expanding their assortments with developments of own beauty lines. Fashion companies like H&M and Lindex have recently launched a new beauty collection and integrated these lines with the existing brand. This is created with help from tools and methods; the design process is used as support in the product development. The products character, identity and function should reflect the brand in the way that it becomes an extension of the brands profile.

    The reason for this bachelor thesis was to develop three conceptual design suggestions for Amazing Brands on how XXXs potential beauty range could look. The goal with the final design proposal is that they all would have a close-knit style combined with XXXs already existing clothing line.

    This mission has been carried out together with the client Amazing Brands with reconciliations through personal meetings and presentations via email. The authors have also taken help from the marketing agency Stark Effekt where Sara Strand served as an external advisor and coach during the mission.

    The implementation is built according to the design process steps where literature search, research and individual interviews on the spot, as field research and documentation have worked as inspiration for the design process. These field trials have taken place at Åhléns City Gothenburg and Stockholm. This has been done to examine which types of beauty products are considered to be the most on demand on the market with a view to form a complete picture of how these products then are being designed. Since the mission is classified, the authors have had to keep an objective approach in order not to show any kind of reference to the brand XXX or XXX.

    Various tools have been combined with various steps in the design process to create a tailor-made concept-generation and concept development. The results of this work has been presented and delivered in the form of three different conceptual design proposals on how a beauty collection could look for the XXX product. Largest base for each proposal has been how the new product range should be integrated with the brand's current branding and identity. The concept proposals that have been developed have focused on conveying a sense of the brand's character, identity and values. The concept proposals have been named after three key words that the authors after research, consider identify both the customer and the brand. 

  • 89.
    Karlström, Joakim
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Screen the modern workplace2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
  • 90.
    Karltun, Johan
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Industriell organisation och produktion.
    McIlroy, Chris
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Industriell organisation och produktion.
    Eriksson, Lars
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Industridesign.
    Joint Context-Sharing Introductory Course for Four Different Master Programs2014Inngår i: Proceedings of the 10th International CDIO Conference, Universitat Politècnica de Catalunya, Barcelona, Spain, June 16-19, 2014, CDIO , 2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The School of Engineering in Jönköping offers four master programs with in total about 100 students, relatively evenly distributed among those four programs. The school has made a thorough revision of all its programs, largely to improve the influence by the principles of CDIO with a start of the new curricula at fall semester 2013. For the master programs this meant that a new joint introductory course for all master students should be set in operation. The aim with this paper is to present the basic rationale behind the course, how it was set in operation and the students’ and teachers’ experiences of the first trial as well as planned modifications for next year’s course. The profile of the research at the school is to advance the knowledge concerning the product realization process in small- and medium sized manufacturing companies and the different master programs support this profile. It was thus decided that the introductory course should demonstrate the same profile by a project performed by the students. Moreover, the course should support the development of a community of master students that know each other regardless of the master program they are following in order to enlarge the opportunities for networking and bringing different experiences together. The course should be appropriate as an introduction course for the four master programs, specializing in industrial design, product development, information engineering or production systems. The course should thus provide understanding also for other stages in the product realization process that are related to but not included in the own education, both regarding the process, the leadership and the research methods used. The design of the course was done by the program managers together with the examining teacher in group dynamics and leadership, thereby involving five teachers. The course examination volume is 9 credits (out of 120 for a whole master program), divided into three parts, the content of the product realization process (3 credits), the group dynamics and leadership development (3 credits) and the research and inquiry methodology knowledge (3 credits). The course was structured and taught by lectures, exercises, seminars and project work. Projects groups were formed including at least one student from each program. The examinations were done by a poster and model exhibition regarding the content of the product realization process, an individual reflective assignment regarding the leadership and group development process during the project and an individual written exam regarding the research and inquiry methodology part. The course is just finished, the exhibition has been held and the teacher group is correcting and grading the exam and the assignments. A plenary oral evaluation has been held where the students confirmed that some goals were reached and some were not. Moreover, the examination results of the course is not fully known yet but will be reported in the paper. The experiences among the teacher group are multifaceted but largely positive and next year’s course is looked forward to.

  • 91.
    Kasvayee, Keivan Amiri
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Ghassemali, Ehsan
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Salomonsson, Kent
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Jarfors, Anders E. W.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Microstructural strain distribution in ductile iron; Comparison between finite element simulation and digital image correlation measurements2015Rapport (Annet vitenskapelig)
    Abstract [en]

    This paper presents a study on micro-scale deformation and the effect of microstructure on localised deformation of ductile iron, utilizing in-situ tension testing, digital image correlation (DIC) and finite element analysis (FEA). A tensile stage integrated with an optical microscope was used to acquire a series of micrographs during the tensile test. Applying DIC and an etched speckle pattern, a high resolution local strain field was measured in the microstructure. In addition, a finite element (FE) model was used to predict the strain maps. The materials parameters were optimized based on Ramberg-Osgood model. The DIC and simulation strain maps conformed to a large extent resulting in the verification of the model in micro-scale level. It was found that the Ramberg-Osgood theory can be used to capture the main trends of strain localization. The discrepancies between the simulated and DIC results were explained based on microstructure dimensionality, differences in spatial resolution and uncertainty in the FE-model.

  • 92.
    Kasvayee, Keivan Amiri
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Ghassemali, Ehsan
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Salomonsson, Kent
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Sujakhu, S.
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Castagne, S.
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Jarfors, Anders E.W.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Strain localization and crack formation effects on stress-strain response of ductile iron2017Inngår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 702, s. 265-271Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The strain localization and crack formation in ferritic-pearlitic ductile iron under tension was investigated by in-situ tensile tests. In-situ tensile tests under optical microscope were performed and the onset of the early ferrite-graphite decohesions and micro-cracks inside the matrix were studied. The results revealed that early ferrite-graphite decohesion and micro-cracks inside the ferrite were formed at the stress range of 280–330 MPa, where a kink occurred in the stress-strain response, suggesting the dissipation of energy in both plastic deformation and crack initiation. Some micro-cracks initiated and propagated inside the ferrite but were arrested within the ferrite zone before propagating in the pearlite. Digital Image Correlation (DIC) was used to measure local strains in the deformed micrographs obtained from the in-situ tensile test. Higher strain localization in the microstructure was measured for the areas in which the early ferrite-graphite decohesions occurred or the micro-cracks initiated.

  • 93.
    Kasvayee, Keivan Amiri
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Salomonsson, Kent
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Ghassemali, Ehsan
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Jarfors, Anders E.W.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Microstructural strain distribution in ductile iron: Comparison between finite element simulation and digital image correlation measurements2016Inngår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 655, s. 27-35Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents a study on microstructural deformation of a ferritic–pearlitic ductile iron, utilizing in-situ tensile testing, digital image correlation (DIC) and finite element analysis (FEA). For this purpose, the in-situ tensile test and DIC were used to measure local strain fields in the deformed microstructure. Furthermore, a continuum finite element (FE) model was used to predict the strain maps in the microstructure. Ferrite and pearlite parameters for the FE-model were optimized based on the Ramberg–Osgood relation. The DIC and simulation strain maps were compared qualitatively and quantitatively. Similar strain patterns containing shear bands in identical locations were observed in both strain maps. The average and localized strain values of the DIC and simulation conformed to a large extent. It was found that the Ramberg–Osgood model can be used to capture the main trends of strain localization. The discrepancies between the simulated and DIC results were explained based on the; (i) subsurface effect of the microstructure; (ii) differences in the strain spatial resolutions of the DIC and simulation and (iii) abrupt changes in strain prediction of the continuum FE-model in the interface of the phases due to the sudden changes in the elastic modulus.

  • 94.
    Khalil, Gilbert
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Sranka, Danijel
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Development of Muv NEX1: Master thesis on Finite Element Analysis of electric TukTuk2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Purpose - In this thesis a further development of Urban Mobility Tech’s (UMT) existing product, “Muv NEX1” has been processed. The product is described as a three-wheel vehicle that comes in assorted designs and has the main function to transport customers between distinct locations. Some problem areas were identified after first prototype was completed. One of the problems was the attachment of the seat belts. The attachment was not validated during collision but UMT assumed it to be weak. Second problem was the attachment of the seats, it required a redesign to withstand a powerful crash. Moreover, a facelift of the frame was requested with the aim of strengthening the construction.

    Method – The work has been performed by completing a concept study. First a requirement specification [appendix 1] and a Gantt chart [appendix 3] was developed to provide a benchmark for what should be done and when. The work that followed thereafter was a competitive analysis supplemented by a pre-study. The purpose of these studies was to observe how the competitors and related industries had solved these and related problems. Results from the studies showed that some of the competitors had comparable products with a design that largely differs from UMT’s vehicles. Brainstorming was thereafter performed to develop innovative ideas as a help to solve the problems and to generate new concepts. Furthermore, the most appropriate concepts were selected through direct feedback from UMT and a method called "Concept Scoring Matrix". The construction of these concepts was simulated and redesigned in iterations to obtain a strong solution. Hypermesh and Abaqus were used as pre-simulation and simulation tools. Finally, one concept remained and was further developed in a CAD environment, specifically in SolidWorks.

    Results - The result was a concept that had been divided into different sub-components. These were seatbelt attachment, seat attachment and B-pillar. Different simulations resulted in a concept for the seatbelt attachment that were both easy to install, cheap to manufacture and strong enough to withstand a collision at a traveling velocity of 25km/h. Furthermore, the seat attachment has been constructed to withstand the high forces that arises during a crash. It’s a welded construction which is extremely light and strong. The B-pillar was in turn kept as close to the original one as possible and only acquired minor adjustments at the weak points. More specifically the B pillar was redesigned with a larger diameter which makes it more stable. In doing so Urban Mobility Tech’s manufacturing process could remain similar as it has been.

    Restrictions - This project has developed a virtual prototype that has been computed and simulated. No physical prototype was developed. The reason for this is the brief time frame that was allocated for the thesis. No customer study was conducted, the work has instead been based on the information received from Urban Mobility Tech.

  • 95.
    Klarbring, Anders
    et al.
    Division of Solid Mechanics, Linköping University, Linköping, Sweden.
    Torstenfelt, Bo
    Division of Solid Mechanics, Linköping University, Linköping, Sweden.
    Hansbo, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Larson, Mats G.
    Department of Mathematics and Mathematical Statistics, Umeå University, Umeå, Sweden.
    Optimal design of fibre reinforced membrane structures2017Inngår i: Structural and multidisciplinary optimization (Print), ISSN 1615-147X, E-ISSN 1615-1488, Vol. 56, nr 4, s. 781-789Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A design problem of finding an optimally stiff membrane structure by selecting one–dimensional fiber reinforcements is formulated and solved. The membrane model is derived in a novel manner from a particular three-dimensional linear elastic orthotropic model by appropriate assumptions. The design problem is given in the form of two minimization statements. After finite element discretization, the separate treatment of each of the two statements follows from classical results and methods of structural optimization: the stiffest orientation of reinforcing fibers coincides with principal stresses and the separate selection of density of fibers is a convex problem that can be solved by optimality criteria iterations. Numerical solutions are shown for two particular configurations. The first for a statically determined structure and the second for a statically undetermined one. The latter shows related but non-unique solutions. 

  • 96.
    Kveselys, Donatas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Weld Producibility Assessment System: Evaluation of Producibility Assessment tools using Set-based approach in Multi-disciplinary Aerospace Design2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This thesis is a continuation of design automation studies within research projects financed by VINNOVA (the Swedish Governmental Agency for Innovation Systems) and Knowledge foundation that contributed to the development of producibility assessment system at a global aerospace products supplier, GKN Aerospace Sweden. A case study was carried at the company on Turbine Rear Structure (TRS) component design of a jet engine with the main objective to evaluate weld producibility assessment tools and to demonstrate system’s performance in multi-disciplinary design environment. The context of this thesis is a set-based product design development where several studies, i.e. thermal, structural, aerodynamic etc. are carried concurrently to gather knowledge between their parameter relations. The thesis contributes to the goal of fully integrated producibility assessment in multi-disciplinary studies to support product development process.

    The problems encountered during the thesis execution involved systematic analysis setup to extract and verify CAD geometry data, assessment of meaningfulness of producibility indicators, development of semi-automated data post-processing module and relating product design to its manufacturing aspects. Commercial and in-house developed software were used extensively to demonstrate the results of the system with the help of continuous company support to mitigate indispensable bottlenecks along the way.

    The work has led to systematic improvements, determined assessment limitations and most relevant weld producibility aspects. Collected feedback to evaluate prepared demonstrator showed promising results to support product design decisions considering both performance and producibility.

  • 97.
    Lang, Johanna
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    New generation ironing board for compact living2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This report describes the product development thesis that was conducted as an end project in the Master programme Industrial Design at Jönköping University.

    The thesis has been about developing, designing and building an ironing board for compact living. The name for the product that has been developed is UNI and it is a multifunctional ironing board which can either be mounted on the wall or hanged over the door. When the ironing board is not in used, it can be folded up and will then act as a mirror. When the ironing board is folded down, parts of the mirrors frame will be folded down and act like a supporting leg for the ironing board. On the inside is shelves and hooks mounted. Here can the owner store small things like keys and jewelleries.

    To get the best final result, have the design process Bootcamp Bootleg been used. This design process is divided in to five different stages where different methods are used to help with moving the project forward.

    The CAD-programme SolidWorks 2014 was used to create the CAD-models and the renderings where made in the rendering programme Keyshot 5.

    The physical model which was made during this thesis, was made in a scale of 1:1. The materials that were used for the model were hard foam, metal, wood, acrylic mirror, wadding and fabric.

    This thesis has been performed in collaboration with the company Rörets Industrier AB located in Jönköping, Sweden. 

  • 98.
    Lanz, Tim
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Cooling concept for combustion pistons: Development, Design and Simulation2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The cooling of combustion pistons is an important process during energy conversion. In car engines this is done by oil, which at the same time is offering lubrication. This work is focusing on an alternative energy converter, a free-piston linear generator of the German Aerospace Center, which is using solid lubricated pistons to avoid oil deposition within the combustion chamber. In doing so, emissions can be reduced but a new way of cooling the piston is needed to continuously guarantee functioning at optimal performance. Concepts were generated systematically and evaluated on their degree of fulfilment. The selected concept guarantees heat extraction at the piston by using the oscillating motion of the components to impose a directed coolant flow between the piston and the colder gas spring. To identify the efficiency, the analysis was divided into two steps: Heat transport analysis at predefined mass-flow rates and coolant transport analysis at different oscillation frequencies. The results, which were achieved by an analytical, numerical and experimental approach, showed great potential of the heat transport processes; as the pistons temperature was not exceeding the defined limits. Also the coolant transport processes were confirmed at low frequencies.

  • 99.
    Levandowski, Christoffer
    et al.
    Chalmers University of Technology.
    Corin Stig, Daniel
    Chalmers University of Technology.
    Raudberget, Dag
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion. Chalmers University of Technology.
    Johannesson, Hans
    Chalmers University of Technology.
    Accommodating Emerging Technologies in Existing Product Platforms2015Inngår i: 24th Annual IAMOT Conference for the International Association for Management of Technology, Cape Town, 8-11 June, 2015., International Association for Management of Technology , 2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    For many companies, proficiency in introducing new technologies is central to their business. For instance, for suppliers in the aerospace industry, having extensive knowledge about a specific technology can be crucial for getting to take part in the next airplane project. However, when new technologies emerge as a result of advanced engineering, they are often hard to implement in product platforms. The fragile nature of a working platform originates from the complex relationships between subsystems and variants. Introducing a new technology into the already fine-tuned platform may affect the performance of the platform negatively, or generate a too large development effort to handle. This may lead to reluctance towards introduction of new promising technologies, which in the long run may result in technologies being discarded as infeasible or being introduced much later than necessary. To be able to assess the impact of a technology and safely accommodate it in an existing platform architecture, it needs to be modeled appropriately. Current models of technologies do not describe them in relation to the architecture they are to be implemented in. Further, the common platform architecture models describe change scenarios from a top-down perspective. Technology introduction would require changing the platform from a bottom-up perspective. This paper suggests an approach to accommodate introduction of emerging technologies into a product platform by means of: - Modeling the technologies as systems in a shared model. - Using trade-off curves to describe the bandwidth of technologies. - Introducing a method for changing a present product platform to incorporate new technologies The method addresses a number of different factors regarding the new technology, e.g. its maturity level, in order to assess the appropriate course of action to safely use the technology in the existing platform. The approach is illustrated using a case from the aerospace industry covering the implementation of water-cooling technology as a means to increase the performance of a jet engine component.

  • 100.
    Lindberg, Dennis
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Design of a luxurious product with integrated OLED panels2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
123 51 - 100 of 147
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf