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  • 1.
    Adolfsson, Albin
    Jönköping University, School of Engineering, JTH, Product Development.
    Konstruktion av campingbord: Utvecklingsprocessen för ett campingbord i aluminium1994Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
  • 2.
    Alfelt, Julia
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH, Product Development.
    Analys av prototyp för fotledsstukningar: Utredning av en prototyps utformning med syfte att minimera felbehandlingen av fotledsstukningar.2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 3.
    Amouzgar, Kaveh
    et al.
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Cenanovic, Mirza
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Salomonsson, Kent
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Multi-objective optimization of material model parameters of an adhesive layer by using SPEA22015In: Advances in structural and multidisciplinary optimization: Proceedings of the 11th World Congress of Structural and Multidisciplinary Optimization (WCSMO-11) / [ed] Qing Li, Grant P Steven, Zhongpu (Leo) Zhang, The International Society for Structural and Multidisciplinary Optimization (ISSMO) , 2015, p. 249-254Conference paper (Refereed)
    Abstract [en]

    The usage of multi material structures in industry, especially in the automotive industry are increasing. To overcome the difficulties in joining these structures, adhesives have several benefits over traditional joining methods. Therefore, accurate simulations of the entire process of fracture including the adhesive layer is crucial. In this paper, material parameters of a previously developed meso mechanical finite element (FE) model of a thin adhesive layer are optimized using the Strength Pareto Evolutionary Algorithm (SPEA2). Objective functions are defined as the error between experimental data and simulation data. The experimental data is provided by previously performed experiments where an adhesive layer was loaded in monotonically increasing peel and shear. Two objective functions are dependent on 9 model parameters (decision variables) in total and are evaluated by running two FEsimulations, one is loading the adhesive layer in peel and the other in shear. The original study converted the two objective functions into one function that resulted in one optimal solution. In this study, however, a Pareto frontis obtained by employing the SPEA2 algorithm. Thus, more insight into the material model, objective functions, optimal solutions and decision space is acquired using the Pareto front. We compare the results and show good agreement with the experimental data.

  • 4.
    André, Samuel
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Supporting the utilization of a platform approach in the engineer-to-order supplier industry2017Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Manufacturing companies are continuously faced with requirements regarding technology novelty, shorter time to market, a higher level of functionality, and lower prices for their products. This is especially true of suppliers that develop and manufacture highly customized products within the automotive industry. It is not uncommon that a request for a new product or subsystem goes out to several suppliers and that the one that can deliver the product most quickly and at the lowest price receives the contract. It is therefore vital for any supplier to answer to quotation requests rapidly and with a high level of precision while also ensuring that company assets are used efficiently. Other issues that apply to suppliers in the automotive industry are heavily fluctuating requirements during development projects, each customer’s individual preferences, and the ever changing interfaces with the OEM product with which the supplier’s product is to be integrated. Platform strategies have been widely accepted in industry to serve a wide product variety while maintaining business efficiency. However, the challenge of applying a platform strategy at the supplier level in the face of the reality described above has not been fully investigated. Platform approaches tend to require a focused development of the platform, which in turn requires some knowledge about which future variants are to be derived from the platform. The research presented in this thesis investigates the state of practice in industry regarding the challenges, needs, and current use of platforms. To respond to the identified need, a platform approach is proposed that expands the scope of what a product platform has traditionally contained. This is undertaken to aid in the development of highly customized products when physical modules or component scalability does not suffice. The platform approach provides a coherent environment for heterogeneous design assets to be used in product development, supporting both the activity of designing and off-the-shelf solutions. The approach is based on identifying and modelling generic product items that are associated with descriptions governing their design. By describing the outcome of technology and product development like finished designs, design guidelines, constraints, etc., in a standardized format, the platform continues to evolve. To aid in using the platform approach, a support system called Design Platform Manager is introduced at a company active as a secondtier supplier in the automotive industry. The system enables the creation of generic product items that can be structured, instantiated, and associated with descriptions, which aids in realizing product variants. The aim of the platform approach and tool is to support the quotation and continued design processes by identifying valid knowledge to use as circumstances, such as requirement changes or new design iterations, warrant. The support tool and overarching model have been evaluated by company representatives, who reported good results.

  • 5.
    André, Samuel
    et al.
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Creating an ability to respond to changing requirements by systematic modelling of design assets and processes2017Conference paper (Refereed)
    Abstract [en]

    System suppliers, e.g. original equipment suppliers, are important for the success of many products. They design a unique solution, often in close collaboration with other companies, based on different product concepts and/or core technologies. The solution can then be manufactured in different quantities depending on the client’s need. High level of customization is required as the interfaces are not standardized, the performance is not negotiable, requirements are not initially fixed and the specific system interacts with, is affected by, or affects other systems that are simultaneously developed. A system supplier commonly designs and manufactures solutions for different OEMs and must support many models and variants in their product portfolios. Efficiency, short lead-time, continuous technology development, and adaptability are essential for the competitive edge. A product platform approach has been a success for many companies to enable variety at low cost, however, it is not applicable for system suppliers. This work describes the result from a case study where a platform approach enabling a new way of structuring, publishing and managing design assets and processes was introduced at a company with the purpose to improve the ability to respond to changing requirements in the quotation process and the subsequent product development activities.

  • 6.
    André, Samuel
    et al.
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Introducing a platform approach at a supplier for efficient design of highly customized systems2017Manuscript (preprint) (Other academic)
  • 7.
    André, Samuel
    et al.
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Johansson, Joel
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Stolt, Roland
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    The design platform – a coherent platform description of heterogeneous design assets for suppliers of highly customised systems2017In: Journal of engineering design (Print), ISSN 0954-4828, E-ISSN 1466-1837, Vol. 28, no 10-12, p. 599-626Article in journal (Refereed)
    Abstract [en]

    Companies developing highly customised products are continuously faced with fluctuating requirements during the early and late stages of the product development (PD) process. This differs from companies that develop end-consumer products, which uses fixed specifications and where product platforms have been a successful enabler for efficient customisation. However, in the past, product platforms have not been able to fully support companies working in an engineer-to-order business environment. This article outlines the results from a three-year collaborative research project between academics within the area of engineering design and practitioners from the engineer-to-order industry. The research introduces a design platform (DP) that aims to support the development of customised products when traditional platform concepts do not suffice. The platform approach provides a coherent environment for heterogeneous design assets to be used in PD by supporting both the design activity and the finished solutions. The needs and abilities regarding such a platform were investigated through a series of interviews and workshops at four companies. Then, the DP was modelled and support tools were developed. Finally, company representatives evaluated the complete DP and its applications, reporting promising results.

  • 8.
    Appusamy Boopathy, Harish
    et al.
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Bonthala, Pavan Kumar
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Electrochemical etching and anodizing as key stages of surface treatment of aluminium foil for electrolytic capacitor industry: Application of Electro Chemical Impedance Spectroscopy as non-destructive characterization of etched anode foil with an anodized dielectric oxide layer2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In the initial stage, the sample preparation was done by using the techniques of Anodic etching and anodic forming processes where a repeated trial and error method of sample preparation headed towards making out a suitable sample set for characterization. After this step, the set of 2 different industrial samples were introduced and anodic oxide forming process was carried out in different electrolytes.

     

     In the sample preparations, 4 different electrolytes were used 15% wt. Ammonium Adiphate, 1.5% wt. Ammonium Phosphate, 7% wt. Boric acid and 15% Penta Borate at different stages for performing the anodic oxide forming process. Minimum forming voltages of 20V to a maximum of 100V was employed in the sample preparation and to overcome the waiting time in forming the etched samples a higher current of 0.5A was used.

     

    After the samples preparation, Electrochemical Impedance spectroscopy was used as a tool for characterising the various groups of samples and for observing the micro structures of various samples, they were fractured and the observed on the cross section by SEM.

     

    After the analysis of the etched samples was made, an attempt to compare the results of the data of these samples to that of the 2 set of industrial samples was made and found that the resultant data wasn’t stable enough to characterize since huge scattering were occurring and whereby the simulation of the CPE circuit for the chosen circuit in the analysis was not possible.

     

    Under the analysis, a randomly chosen industrial sample was also used and the resultant data was utilised in understanding the response of the system to different electrolytes.

  • 9.
    Bagare, Vinay Shrinivas
    Jönköping University, School of Engineering, JTH, Product Development.
    Study on wear modelling using pilot jaw crusher2017Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    The crushers are used by mining and aggregate industries for crushing the rocks. Wear in these crushers wear parts causes a great wear loss and significant economic loss. This work aims to find the worn geometry, hardness and behavior of the wear parts as function of rock type.To perform this research, a series of tests such as scratch test, rock-crushing test, microstructural analysis and hardness test were carried out. From the scratch test, hardness test and microstructural analysis, wear mechanism and work hardening effects were studied using LOM, SEM and Vickers hardness measurement. The crushing test was carried out by crushing quartzite, diabase and gneiss rocks in a mini jaw crusher with respect to M1, M2 and M7 samples proposed by the company, which provides data to calculate volumetric loss, wear ratio and data for power consumption. The data collected from the experiments are used to create model to get a clear picture of the performance of each material with respect to different rock type.During pouring the rocks into the jaw crusher, several types of wear are expected to be occur, which substantially results in change of the geometry of the jaw crusher plates and hence the performance of the crusher will be affected. Controlling of such harsh wear situations requires introducing a material with high-performance wear resistance (particularly abrasion) and fundamentally modifying the operating conditions to minimize the risk of severe wear degradation. For this reason, it is desirable to simulate how the geometry and performance are changing due to wear.The results from the scratch test and microstructural analysis showed that at low applied loads severe plastic deformation is seen but as the load increases, the work hardening mechanism develops and provides wear resistance properties. The results from hardness test and modeling, M7 sample shows good wear resistance properties against hard and abrasive rocks which in this case is diabase and quartzite rocks, M2 sample shows good wear resistance against only quartzite rocks and gneiss rocks. M1 sample shows less volumetric loss against quartzite but when compared to M2 and M7’s mechanical property, M1 showed low wear resistance against all three rocks.

    Key words: Wear mechanism, work hardening, wear ratio, volumetric loss, power consumption, M1, M2, M7 samples, quartzite, diabase and gneiss rock.

  • 10.
    Bazzi, Ali
    et al.
    Jönköping University, School of Engineering, JTH, Product Development.
    Angelou, Andreas
    Jönköping University, School of Engineering, JTH, Product Development.
    Simulation of the anisotropic material properties in polymers obtained in thermal forming process2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In an attempt to improve the quality in finite element analysis of thermoformed components, a method for predicting the thickness distribution is presented. The strain induced anisotropic material behaviour in the amorphous polymers of concern is also taken into account in the method. The method comprises of obtaining raw material data from experiments, followed by a simulation of the vacuum thermoforming process where hyperelastic material behaviour is assumed. The theory of hyperelasticity that was applied was based on the Ogden model and implemented in the FE-software LS-DYNA. Material behaviour from thermoformed prototypes is examined by experiments and implemented together with the mapped results from the thermoforming simulation in a succeeding FE-model. For the latter, the three-parameter Barlat model was suggested, giving the possibility to account for anisotropic material behaviour based on an initial plastic strain.

  • 11.
    Beckius, Fredrik
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Jönköping University, School of Engineering, JTH, Product Development.
    Gustafsson, Robin
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Jönköping University, School of Engineering, JTH, Product Development.
    Connecting casting simulation and FE software including local variation of physical properties.: Investigation on local material properties and microstructure in a grey iron cylinder head.2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 12.
    Belov, Ilja
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Nordh, Andreas
    Salomonsson, Kent
    Jönköping University, School of Engineering, JTH, Product Development.
    Leisner, Peter
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Fin‐Tube and Plate Heat Exchangers: Evaluation of Transient Performance2017Conference paper (Refereed)
    Abstract [en]

    A methodology for evaluation of transient performance of, and comparison between plate heat exchanger and plate-fin-and-tube heat exchanger was developed and realized, including experiment and 3-D simulation. Heat transfer from water to a gas medium was addressed. The heated gas volume was the same for both heat exchanger designs. This was achieved by placing the plate-fin-and-tube heat exchanger into enclosure. The volume average temperature of the gas as function of time was computed. Estimated material cost for the studied designs was at least seven times lower than for the stainless steel plate heat exchanger. The performance of the selected plate-fin-and-tube heat exchanger design was found comparable to the plate heat exchanger, when both fin and tube materials were set to Al, and the enclosure was a light-weight thermal insulator. Transient behavior of the studied heat exchangers should be of interest for micro-grid applications, but also for thermal management in electronic cabinets and data centers.

  • 13.
    Berglund, Simon
    et al.
    Jönköping University, School of Engineering, JTH, Product Development.
    Lennartsson, Joel
    Jönköping University, School of Engineering, JTH, Product Development.
    Design of Power Off Brake: Utveckling av testutrustning2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The goal with this thesis is to find together with Saab Avionics Systems the correlation between applied current, air gap and forces that a brake with an electromagnetic release function have. This is achieved through theoretical calculations and practical tests.  

    At the moment the brakes are used in electromechanical actuators that are applied in aircraft flap systems.

    These brakes have been in Saab’s collection of products since a decade and to keep on being a competitive supplier they need to optimize their design process. However, there are difficulties regarding calculating the force of the magnetic field of these brakes since it is very complicated. To better understand how the design can be altered the current product Power Off Brake needs to be tested and analyzed.  

    The test equipment that was developed is designed so that the brake dimension, air gap and current can vary alongside a change of surrounding temperature. After a test in room temperature it was found that the test equipment had a margin of error about 10%.

    By testing Power Off Brake with the selected measuring method and test equipment Saab will get one step closer to better understand the relationship between theoretical calculations and practical tests. This can be used to reduce the safety margins when new brakes are to be developed since the test results provide insight about what happens when saturation in the material occur and how the brake perform in environmental conditions of an aircraft.

    Furthermore, the authors leave recommendations for continued work and suggestions for improved design.

  • 14.
    Bergman, Martin
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Eriksson, Lars
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Industrial Design.
    Surface appearance and impression2012In: Proceedings of the International Conference on Kansei Engineering and Emotion Research :: KEER2012, Green Kansei, 22-25 May 2012, Penghu, Taiwan / [ed] Feng-Tyan Lin, 2012Conference paper (Refereed)
  • 15.
    Bergman, Martin
    et al.
    Högskolan i Halmstad.
    Rosén, Bengt-Göran
    Högskolan i Halmstad.
    Eriksson, Lars
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Industrial Design.
    Anderberg, Cecilia
    Getinge Infection Control AB, Research & Development Department, Sweden.
    Surface design methodology: challenge the steel2013In: Metrology and Properties of Engineering Surfaces, 2013: Proceedings of the 14th International Conference, Taipei, Taiwan, June 17-21, 2013, Bristol, UK: Institute of Physics Publishing (IOPP), 2013Conference paper (Refereed)
    Abstract [en]

    The way a product or material is experienced by its user could be different depending on the scenario. It is also well known that different materials and surfaces are used for different purposes. When optimizing materials and surface roughness for a certain something with the intention to improve a product, it is important to obtain not only the physical requirements, but also the user experience and expectations. Laws and requirements of the materials and the surface function, but also the conservative way of thinking about materials and colours characterize the design of medical equipment. The purpose of this paper is to link the technical- and customer requirements of current materials and surface textures in medical environments. By focusing on parts of the theory of Kansei Engineering, improvements of the companys' products are possible. The idea is to find correlations between desired experience or «feeling» for a product, -customer requirements, functional requirements, and product geometrical properties -design parameters, to be implemented on new improved products. To be able to find new materials with the same (or better) technical requirements but a higher level of user stimulation, the current material (stainless steel) and its surface (brushed textures) was used as a reference. The usage of focus groups of experts at the manufacturer lead to a selection of twelve possible new materials for investigation in the project. In collaboration with the topical company for this project, three new materials that fulfil the requirements -easy to clean and anti-bacterial came to be in focus for further investigation in regard to a new design of a washer-disinfector for medical equipment using the Kansei based Clean ability approach CAA. © Published under licence by IOP Publishing Ltd.

  • 16.
    Bjursell, Cecilia
    et al.
    Jönköping University, School of Education and Communication, HLK, Lifelong learning/Encell.
    Raudberget, Dag
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Organisering för kunskap och lärande: En balansgång mellan motsättningar2017In: HR: Att ta tillvara mänskliga resurser / [ed] Helene Ahl, Ingela Bergmo Prvulovic & Karin Kilhammar, Lund: Studentlitteratur AB, 2017, p. 59-76Chapter in book (Refereed)
  • 17.
    Burman, Erik
    et al.
    University College London, Gower Street, UK.
    Elfverson, Daniel
    Umeå University, Sweden.
    Hansbo, Peter
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Larson, Mats G.
    Umeå University, Sweden.
    Larsson, Karl
    Umeå University, Sweden.
    A cut finite element method for the Bernoulli free boundary value problem2017In: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 317, p. 598-618Article in journal (Refereed)
    Abstract [en]

    We develop a cut finite element method for the Bernoulli free boundary problem. The free boundary, represented by an approximate signed distance function on a fixed background mesh, is allowed to intersect elements in an arbitrary fashion. This leads to so called cut elements in the vicinity of the boundary. To obtain a stable method, stabilization terms are added in the vicinity of the cut elements penalizing the gradient jumps across element sides. The stabilization also ensures good conditioning of the resulting discrete system. We develop a method for shape optimization based on moving the distance function along a velocity field which is computed as the H1 Riesz representation of the shape derivative. We show that the velocity field is the solution to an interface problem and we prove an a priori error estimate of optimal order, given the limited regularity of the velocity field across the interface, for the velocity field in the H1norm. Finally, we present illustrating numerical results.

  • 18.
    Burman, Erik
    et al.
    Department of Mathematics, University College London, Gower Street, London, United Kingdom.
    Elfverson, Daniel
    Department of Mathematics and Mathematical Statistics, Umeå University, Umeå, Sweden.
    Hansbo, Peter
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Larson, Mats G.
    Department of Mathematics and Mathematical Statistics, Umeå University, Umeå, Sweden.
    Larsson, Karl
    Department of Mathematics and Mathematical Statistics, Umeå University, Umeå, Sweden.
    Shape and topology optimization using CutFEM2017In: Simulation for Additive Manufacturing 2017, Sinam 2017, International Center for Numerical Methods in Engineering (CIMNE), 2017, p. 208-209Conference paper (Refereed)
  • 19.
    Burman, Erik
    et al.
    Department of Mathematics, University College London, London, United Kingdom..
    Hansbo, Peter
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Deriving Robust Unfitted Finite Element Methods from Augmented Lagrangian Formulations2017In: Geometrically Unfitted Finite Element Methods and Applications / [ed] Bordas, Stéphane P. A.; Burman, Erik; Larson, Mats G.; Olshanskii, Maxim A., Cham: Springer International Publishing , 2017, p. 1-24Conference paper (Refereed)
    Abstract [en]

    In this paper we will discuss different coupling methods suitable for use in the framework of the recently introduced CutFEM paradigm, cf. Burman et al. (Int. J. Numer. Methods Eng. 104(7):472–501, 2015). In particular we will consider mortaring using Lagrange multipliers on the one hand and Nitsche’s method on the other. For simplicity we will first discuss these methods in the setting of uncut meshes, and end with some comments on the extension to CutFEM. We will, for comparison, discuss some different types of problems such as high contrast problems and problems with stiff coupling or adhesive contact. We will review some of the existing methods for these problems and propose some alternative methods resulting from crossovers from the Lagrange multiplier framework to Nitsche’s method and vice versa.

  • 20.
    Burman, Erik
    et al.
    University College London.
    Hansbo, Peter
    Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization. Jönköping University, School of Engineering, JTH, Product Development.
    Larson, Mats G.
    Umeå University.
    A stabilized cut finite element method for partial differential equations on surfaces: The Laplace–Beltrami operator2015In: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 285, p. 188-207Article in journal (Refereed)
    Abstract [en]

    We consider solving the Laplace–Beltrami problem on a smooth two dimensional surface embedded into a three dimensional space meshed with tetrahedra. The mesh does not respect the surface and thus the surface cuts through the elements. We consider a Galerkin method based on using the restrictions of continuous piecewise linears defined on the tetrahedra to the surface as trial and test functions.

    The resulting discrete method may be severely ill-conditioned, and the main purpose of this paper is to suggest a remedy for this problem based on adding a consistent stabilization term to the original bilinear form. We show optimal estimates for the condition number of the stabilized method independent of the location of the surface. We also prove optimal a priori error estimates for the stabilized method. 

  • 21. Burman, Erik
    et al.
    Hansbo, Peter
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Larson, Mats G.
    Institutionen för matematik och matematisk statistik, Umeå universitet.
    The penalty-free Nitsche Method and nonconforming finite elements for the Signorini problem2017In: SIAM Journal on Numerical Analysis, ISSN 0036-1429, E-ISSN 1095-7170, Vol. 55, no 6, p. 2523-2539Article in journal (Refereed)
    Abstract [en]

    We design and analyse a Nitsche method for contact problems. Compared to the seminal work of Chouly and Hild [SIAM J. Numer. Anal., 51 (2013), pp. 1295--1307], our method is constructed by expressing the contact conditions in a nonlinear function for the displacement variable instead of the lateral forces. The contact condition is then imposed using the nonsymmetric variant of Nitsche's method that does not require a penalty term for stability. Nonconforming piecewise affine elements are considered for the bulk discretization. We prove optimal error estimates in the energy norm.

  • 22.
    Burman, Erik
    et al.
    University College London, UK.
    Hansbo, Peter
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Larson, Mats G.
    Umeå University, Sweden.
    Massing, André
    Umeå University, Sweden.
    A cut discontinuous Galerkin method for the Laplace–Beltrami operator2017In: IMA Journal of Numerical Analysis, ISSN 0272-4979, E-ISSN 1464-3642, Vol. 37, no 1, p. 138-169Article in journal (Refereed)
    Abstract [en]

    We develop a discontinuous cut finite element method for the Laplace–Beltrami operator on a hypersurface embedded in R. The method is constructed by using a discontinuous piecewise linear finite element space defined on a background mesh in R. The surface is approximated by a continuous piecewise linear surface that cuts through the background mesh in an arbitrary fashion. Then, a discontinuous Galerkin method is formulated on the discrete surface and in order to obtain coercivity, certain stabilization terms are added on the faces between neighbouring elements that provide control of the discontinuity as well as the jump in the gradient. We derive optimal a priori error and condition number estimates which are independent of the positioning of the surface in the background mesh. Finally, we present numerical examples confirming our theoretical results.

  • 23.
    Burman, Erik
    et al.
    Department of Mathematics, University College London, United Kingdom.
    Hansbo, Peter
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Larson, Mats G.
    Department of Mathematics and Mathematical Statistics, Umeå University, Sweden.
    Massing, André
    Department of Mathematics and Mathematical Statistics, Umeå University, Sweden.
    Zahedi, Sara
    Department of Mathematics, KTH, Stockholm, Sweden.
    Full gradient stabilized cut finite element methods for surface partial differential equations2016In: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 310, p. 278-296Article in journal (Refereed)
    Abstract [en]

    We propose and analyze a new stabilized cut finite element method for the Laplace–Beltrami operator on a closed surface. The new stabilization term provides control of the full R 3 gradient on the active mesh consisting of the elements that intersect the surface. Compared to face stabilization, based on controlling the jumps in the normal gradient across faces between elements in the active mesh, the full gradient stabilization is easier to implement and does not significantly increase the number of nonzero elements in the mass and stiffness matrices. The full gradient stabilization term may be combined with a variational formulation of the Laplace–Beltrami operator based on tangential or full gradients and we present a simple and unified analysis that covers both cases. The full gradient stabilization term gives rise to a consistency error which, however, is of optimal order for piecewise linear elements, and we obtain optimal order a priori error estimates in the energy and L 2 norms as well as an optimal bound of the condition number. Finally, we present detailed numerical examples where we in particular study the sensitivity of the condition number and error on the stabilization parameter.

  • 24.
    Burman, Erik
    et al.
    Department of Mathematics, University College London.
    Hansbo, Peter
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Larson, Mats G.
    Department of Mathematics and Mathematical Statistics, Umeå University.
    Stenberg, Rolf
    Department of Mathematics and Systems Analysis, Aalto University.
    Galerkin least squares finite element method for the obstacle problem2017In: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 313, p. 362-374Article in journal (Refereed)
    Abstract [en]

    We construct a consistent multiplier free method for the finite element solution of the obstacle problem. The method is based on an augmented Lagrangian formulation in which we eliminate the multiplier by use of its definition in a discrete setting. We prove existence and uniqueness of discrete solutions and optimal order a priori error estimates for smooth exact solutions. Using a saturation assumption we also prove an a posteriori error estimate. Numerical examples show the performance of the method and of an adaptive algorithm for the control of the discretization error.

  • 25.
    Burman, Erik
    et al.
    University College London.
    Hansbo, Peter
    Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization. Jönköping University, School of Engineering, JTH, Product Development.
    Larson, Mats G.
    Umeå University.
    Zahedi, Sara
    KTH Royal Institute of Technology.
    Cut finite element methods for coupled bulk–surface problems2016In: Numerische Mathematik, ISSN 0029-599X, E-ISSN 0945-3245, Vol. 133, no 2, p. 203-231Article in journal (Refereed)
    Abstract [en]

    We develop a cut finite element method for a second order elliptic coupled bulk-surface model problem. We prove a priori estimates for the energy and L2 norms of the error. Using stabilization terms we show that the resulting algebraic system of equations has a similar condition number as a standard fitted finite element method. Finally, we present a numerical example illustrating the accuracy and the robustness of our approach.

  • 26.
    Caballer, Marina
    Jönköping University, School of Engineering, JTH, Product Development.
    Box for delivery2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 27.
    Carrass, Johanna
    et al.
    Jönköping University, School of Engineering, JTH, Product Development. 1993.
    Nordborg, Madelen
    Jönköping University, School of Engineering, JTH, Product Development.
    AB Småland: En undersökning om kanaler för återbruk åt AB Småland samt möjligheter med miljömärkningar för kommersiell handel.2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sustainable development has for a long time been a much spoken topic worldwide and so in Sweden. Sustainable development is about creating a social economic and cultural development and to ensure human well-being in balance with the earth´s ecological system. Nowadays sustainable consumption is also a much spoken topic. Sustainable consumption is about how humans consume, what humans consume and in what way. This means that we carefully need to choose what products to buy and use them as long as they are still alive. Because of human’s unsustainable way of using the resources from earth, we now need to stop using the linear economy and start using the circular economy. This will lower the environmental effect.

    This study aimed to investigate how AB Småland, a company in Malmö, can get customers to hand in furniture to the store for reusing. The company wants to expand their business by collecting second-hand furniture from costumers. In turn, they will sell these furniture at the company’s own auctions. The students' work was to help AB Småland to see what is required of them to get this process working, to get a flow with recycled furniture. The study included an investigation of the Miljönär-Vänlig labels’ options to facilitate consumers to make better choices for a more sustainable consumption in the future. To do research on how consumers think and act was relevant to understand why these behaviors occur in order to understand the value of marketing sustainability. The study also included previous research in the area.

    The study’s two issues:

    [1] How can AB Småland get customers to hand in furniture to the store for recycling? [2] Can a label like Miljönär-Vänlig help consumers to understand the concept for stores that work with sustainability?

    To answer the first issue of the study the students gathered data through interviews with companies that work with the durability to take note of how they solved it. To be able to answer the second issue of the study the students carried out a web survey in which the purpose was to gather information about consumers' attitudes to sustainability and their consequences of consuming. In order to underpin both issues, literatures were used and were carefully chosen to answer the purpose of the study.

    The report presents the results for the study’s two issues that both have all three data collection methods proving them.

    The result from the study’s’ first issue shows that AB Småland should focus a lot on the preparatory work and strategies that will be required to get their new part of the business to be profitable. They have got help with some parts through the proposal of a business model, SWOT analysis, competitive analysis, how to design the "Re-Mill tab" on the website, which the students produced.

    The result from the study’s’ second issue shows that Miljönär-Vänlig is a label that is not suitable for AB Småland in the current situation because it is for those operations where the main part of the business is about "fix, borrow and reuse" in order to minimize waste. It can be a good tool for stores, which work with environmental issues, in order to help the consumer make better choices. But AB Småland can create an own label that shows customers how the company works with sustainable products.

    To get AB Smålands new part of the business profitable, they should consider that it requires thorough preparation. Time is of essence and other resources are needed and the work should not be rushed. Before they start this process, AB Småland should establish and clearly review policies and their business model so everyone in the company can be initiated.

    The students have come to the conclusion that AB Småland has to work with their marketing in order to reach consumers and help them understand the company’s values and concepts.

  • 28.
    Cenanovic, Mirza
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Finite element methods for surface problems2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The purpose of this thesis is to further develop numerical methods for solving surface problems by utilizing tangential calculus and the trace finite element method. Direct computation on the surface is possible by the use of tangential calculus, in contrast to the classical approach of mapping 2D parametric surfaces to 3D surfaces by means of differential geometry operators. Using tangential calculus, the problem formulation is only dependent on the position and normal vectors of the 3D surface. Tangential calculus thus enables a clean, simple and inexpensive formulation and implementation of finite element methods for surface problems. Meshing techniques are greatly simplified from the end-user perspective by utilizing an unfitted finite element method called the Trace Finite Element Method, in which the basic idea is to embed the surface in a higher dimensional mesh and use the shape functions of this background mesh for the discretization of the partial differential equation. This method makes it possible to model surfaces implicitly and solve surface problems without the need for expensive meshing/re-meshing techniques especially for moving surfaces or surfaces embedded in 3D solids, so called embedded interface problems. Using these two approaches, numerical methods for solving three surface problems are proposed: 1) minimal surface problems, in which the form that minimizes the mean curvature was computed by iterative update of a level-set function discretized using TraceFEM and driven by advection, for which the velocity field was given by the mean curvature flow, 2) elastic membrane problems discretized using linear and higher order TraceFEM, which makes it straightforward to embed complex geometries of membrane models into an elastic bulk for reinforcement and 3) stabilized, accurate vertex normal and mean curvature estimation with local refinement on triangulated surfaces. In this thesis the basics of the two main approaches are presented, some aspects such as stabilization and surface reconstruction are further developed, evaluated and numerically analyzed, details on implementations are provided and the current state of work is presented.

  • 29.
    Cenanovic, Mirza
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Numerical error estimation for a TraceFEM membrane and distance function on P1 and P2 tetrahedraManuscript (preprint) (Other academic)
  • 30.
    Cenanovic, Mirza
    et al.
    Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization. Jönköping University, School of Engineering, JTH, Product Development.
    Hansbo, Peter
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Larson, Mats G,
    Umeå University.
    Minimal surface computation using a finite element method on an embedded surface2015In: International Journal for Numerical Methods in Engineering, ISSN 0029-5981, E-ISSN 1097-0207, Vol. 104, no 7, p. 502-512Article in journal (Refereed)
    Abstract [en]

    We suggest a finite element method for finding minimal surfaces based on computing a discrete Laplace–Beltrami operator operating on the coordinates of the surface. The surface is a discrete representation of the zero level set of a distance function using linear tetrahedral finite elements, and the finite element discretization is carried out on the piecewise planar isosurface using the shape functions from the background three-dimensional mesh used to represent the distance function. A recently suggested stabilized scheme for finite element approximation of the mean curvature vector is a crucial component of the method.

  • 31.
    Cenanovic, Mirza
    et al.
    Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Hansbo, Peter
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Larsson, Mats G.
    Umeå University.
    Cut finite element modeling of linear membranes2016In: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 310, p. 98-111Article in journal (Refereed)
    Abstract [en]

    We construct a cut finite element method for the membrane elasticity problem on an embedded mesh using tangential differential calculus, i.e., with the equilibrium equations pointwise projected onto the tangent plane of the surface to create a pointwise planar problem in the tangential direction. Both free membranes and membranes coupled to 3D elasticity are considered. The discretization of the membrane comes from a Galerkin method using the restriction of 3D basis functions (linear or trilinear) to the surface representing the membrane. In the case of coupling to 3D elasticity, we view the membrane as giving additional stiffness contributions to the standard stiffness matrix resulting from the discretization of the three-dimensional continuum.

  • 32.
    Cenanovic, Mirza
    et al.
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Hansbo, Peter
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Larsson, Mats G.
    Finite element procedures for computing normals and mean curvature on triangulated surfaces and their use for mesh refinementManuscript (preprint) (Other academic)
    Abstract [en]

    In this paper we consider finite element approaches to computing the mean curvature vector and normal at the vertices of piecewise linear triangulated surfaces. In particular, we adopt a stabilization technique which allows for first order L2-convergence of the mean curvature vector and apply this stabilization technique also to the computation of continuous, recovered, normals using L2-projections of the piecewise constant face normals. Finally, we use our projected normals to define an adaptive mesh refinement approach to geometry resolution where we also employ spline techniques to reconstruct the surface before refinement. We compare or results to previously proposed approaches.

  • 33.
    Chen, Jianing
    Jönköping University, School of Engineering, JTH, Product Development.
    Smart Headphone Design and Development2015Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
  • 34.
    Cravero, Louis
    Jönköping University, School of Engineering, JTH, Product Development.
    Wireless glass phone charger2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Saint-Gobain is the world’s biggest glass manufacturer. The aim of Saint-Gobain is to constantly innovate in order to make living spaces more comfortable, cost-efficient and sustainable worldwide. The range of products is extremely wide: it goes from span for self-cleaning windows to photovoltaic glass and building materials.Today, innovation is not only in the material itself but also in the system where the glass is involved. The aim of this final thesis was to innovate by creating a new experience for the user through a communicative lighting glass system.As it will be developed in this report, this final thesis has been proceeding in different steps, from identifying the problem to the final prototype. The first step was to identify the need, to understand the challenge and to identify which product could be interesting to develop. After this step, the product has been settled and then the development phase went through different steps from the interpretation of the learning to the ideation to the prototyping and refinements.After identifying goals of this thesis in the first step of discovery, we have chosen the product to develop: a wireless glass charger for smartphones.

    The full text will be freely available from 2027-06-24 15:13
  • 35.
    De Goey, Heleen
    et al.
    Jönköping University, School of Engineering, JTH, Industrial Engineering and Management.
    Hilletofth, Per
    Jönköping University, School of Engineering, JTH, Industrial Engineering and Management. Jönköping University, School of Engineering, JTH. Research area Industrial Production.
    Eriksson, Lars
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Industrial Design.
    Design-driven innovation: A literature review2016In: Proceedings of the 20th DMI: Academic Design Management Conference, Boston, USA, 2016Conference paper (Refereed)
  • 36.
    De Goey, Heleen
    et al.
    Swerea IVF, Sweden.
    Hilletofth, Per
    Jönköping University, School of Engineering, JTH, Industrial Engineering and Management.
    Eriksson, Lars
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Industrial Design.
    Design-driven innovation: Making meaning for whom?2017In: Design journal, ISSN 1460-6925, E-ISSN 1756-3062, Vol. 20, no Suppl. 1, p. S479-S491Article in journal (Refereed)
    Abstract [en]

    Design-driven innovation focuses on the innovation of product meanings. This innovation is enabled by integrating knowledge on needs, product language and technological development. So far, it has mostly been studied in contexts where the buyer is the assumed end user. There has been little research about design-driven innovation in other contexts, such as business-to-business and public contexts. Here, companies need to create value for multiple stakeholders. In this study, these are defined as users, buyers and influencers. The aim of this study is to explore how companies consider the different stakeholders in the innovation of product meanings. Two companies participated in a case study. The results demonstrate that both companies mainly focus on addressing needs. However, while one case company prioritizes the perspective from the user, the other focuses more on the buyer. The results illustrate the increased complexity that companies need to manage in design-driven innovation in these contexts.

  • 37.
    De Goey, Heleen
    et al.
    Swerea IVF, Sweden.
    Hilletofth, Per
    Jönköping University, School of Engineering, JTH, Industrial Engineering and Management.
    Eriksson, Lars
    Jönköping University, School of Engineering, JTH, Product Development.
    Design-driven innovation: Making meaning for whom2017In: Proceedings of the 12th EAD Conference: Design for Next, European Academy of Design, 2017Conference paper (Refereed)
    Abstract [en]

    Design-driven innovation focuses on the innovation of product meanings. This innovation is enabled by integrating knowledge on needs, product language and technological development. So far, it has mostly been studied in contexts where the buyer is the assumed end user. There has been little research about design-driven innovation in other contexts, such as business-to-business and public contexts. Here, companies need to create value for multiple stakeholders. In this study, these are defined as users, buyers and influencers. The aim of this study is to explore how companies consider the different stakeholders in the innovation of product meanings. Two companies participated in a case study. The results demonstrate that both companies mainly focus on addressing needs. However, while one case company prioritizes the perspective from the user, the other focuses more on the buyer. The results illustrate the increased complexity that companies need to manage in design-driven innovation in these contexts.

  • 38.
    Elgh, Fredrik
    et al.
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    André, Samuel
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Johansson, Joel
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Stolt, Roland
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Design Platform - A Coherent Model for Management and Use of Mixed Design Assets2017In: Transdisciplinary Engineering: A Paradigm Shift: Proceedings of the 24th ISPE Inc. International Conference on Transdisciplinary Engineering / [ed] C. H. Chen, A. C. Trappey, M. Peruzzini, J. Stjepandić, & N. Wognum, IOS Press, 2017, no 3-4, p. 703-712Conference paper (Refereed)
    Abstract [en]

    For many companies, it is a challenge to balance product variety and cost, i.e. external and internal efficiency. Product platforms has been the dominant solution for a business targeting mass-customization. The main idea is to dived the product into modules that can be shared among different product variants. This has been a success on the consumer market, however, many manufacturing companies are engineer-to-order (ETO) oriented, such as original equipment suppliers (OES). They design a unique solution, often in close collaboration with other companies, based on different product concepts and/or core technologies. For these companies, there is a strategic need for a platform model influenced by the principles of masscustomization, although, not limited to only include modules. In this work, a novel platform model, called Design Platform is described. The model has been developed and applied in cooperation with four companies. The Design Platform provides a coherent environment for management of heterogeneous design assets to be used in product development and supports an improved ability to master fluctuating requirements and systematic introduction of new technologies.

  • 39.
    Elmquist, Lennart
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Eriksson, Lars
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Industrial Design.
    Ekman, Fredrik
    Research and Development, Strömsholmen AB.
    Workshop at a company with students from two different disciplines2014Conference paper (Refereed)
    Abstract [en]

    Teachers from two different disciplines, Materials and manufacturing and Industrial design, are brought together to give a course on masters level. Also the students come from different disciplines. They study two different master programs in Product development, Product development and materials engineering and Industrial design. The course is called Materials and design, and it covers both disciplines. Apart from lectures, computer labs and home assignments, a workshop was arranged where the students during one day solved a task related to product development. The students were divided into groups in such a way that a mixture of students from the two programs was obtained. The workshop was held at a company in order to make the work more realistic. Before they started to solve the task, they were given an introduction to the products made by the company and their applications. The main task was then to investigate the products and come up with ideas about what applications there might be in the future. The result was at the end of the day presented to the company. In this paper, the workshop is described, and comments and reflections from the students and the company are summarized. Finally the teachers involved give their opinion about the result and the pedagogic benefits from such a workshop, and also what to think about for the next time. It appeared that the workshop was an eye-opener to the company at the same time as the students had a fair chance to work in a realistic situation and practice how to use their knowledge. Also for the teachers it was a good experience, not only from a pedagogic viewpoint but also on how to arrange this kind of workshops in the future.

  • 40.
    Erlansson, Erik
    et al.
    Jönköping University, School of Engineering, JTH, Product Development.
    Axelsson, Adam
    Jönköping University, School of Engineering, JTH, Product Development.
    Konceptutveckling av lasthållarfot för integrerad takreling2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 41.
    Forsman, Marcus
    et al.
    Jönköping University, School of Engineering, JTH, Product Development.
    Moberg, Hanna
    Jönköping University, School of Engineering, JTH, Product Development.
    Framtagning av justerbara möbelben2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Rapporten omfattar ett examensarbete utfört på Tekniska högskolan i Jönköping av tvåkandidatstudenter inom produktutveckling. Examensarbetet är ett uppdrag frånuppdragsgivaren Prettypegs, vilket är ett svenskt företag som designar utbytbara möbelben.Möbelbenen kan fästas på möbler från olika leverantörer, som exempelvis IKEA. Prettypegsvision är att möbelbenen ska bidra med stil och ett personligare uttryck till hemmet. Företagethar sedan tidigare inga produkter inom segmentet kök och badrum och vill nu utvidga derassortiment. En utmaning som företaget ställs inför vid produktframtagning är att ta framprodukter som är såväl smarta som lättapplicerade och dessutom behagar flera olikamöbelsorter. När projektgruppen ska ta fram designförslag på möbelben till kök och badrumtillkommer ytterligare problem som exempelvis en justerbar funktion.

    Studiens syfte var att ta fram tre designförslag på justerbara benkonstruktioner anpassade förkök- och badrumsmiljö. Konceptutvecklingen som genomfördes skulle bidra till tvådesignförslag justerbara mellan 70 och 140 mm och ett designförslag justbart mellan 300 och400 mm. Produktens estetiska uttryck och anpassningsbara design var viktiga aspekter, menprioriteringen i uppdraget var produktens funktion och hållbarhet. För att uppnå syftetutformades tre frågeställningar:

    1. Vilka fördelar och nackdelar finns med befintliga höj- och sänkbara funktioner ochegenskaper hos benkonstruktioner på marknaden?

    2. Vilka kvalitetskrav bör ställas på materialet till produkten?

    3. Hur kan produkten designas utifrån Prettypegs värderingar och krav?

    En analys av befintliga möbelben på marknaden genomfördes för att identifiera för- ochnackdelar samt egenskaper hos justerbara funktioner.Analysen resulterade i antagandet attprodukter på marknaden dominerades av en skruvfunktion för att justera höjden och att mångaprodukter endast gick att justera någon centimeter. Förutom de minimalajusteringsmöjligheterna var även valmöjligheter av färg och material begränsade hos de olikaprodukterna. Majoriteten av möbelbenen som analyserade var i metall vilket ansågs ge ettstilrent och stabilt intryck.

    Till den andra frågeställningen undersöktes material för att finna kvalitetskrav som skulleställas på materialet hos designförslagen. Denna undersökning resulterade i kvalitetskravenfukttålighet, hållbarhet, slitstyrka, korrosionshärdighet och lång livslängd.

    För att besvara den tredje frågeställningen togs tre konceptförslag fram med designprocessensom verktyg. Resultatet var att produkten kunde designas genom att integrera Prettypegs krav och värderingar i designprocessens alla steg med kvalitetskrav och framforskade kunskaper omjusterbara funktioner som underlag.

    Projektgruppen genomförde designprocessen vid framtagning av de tre koncepten och användeen systematisk urvalsprocess för att fastställa de tre bäst lämpade designförslagen:

    - Justerbart möbelben mellan 300 och 400 mm där varje ben bestod av tre metallstängersom var för sig justerades genom en skruvfunktion.

    - Justerbart möbelben mellan 70 och 140 mm där varje ben bestod av en kvadratiskmetallrörsprofil från framkant till bakkant av möbeln. Justeringsfunktionen fungeradegenom en spärr som fixerades mellan förborrade hål.

    - Justerbart möbelben mellan 70 och 140 mm där varje ben bestod av tre komponenter, tvåcylindriska rör som genom vridning separerades från varandra och exponerade en skruv.

    Projektgruppens rekommendationer till Prettypegs är att vidarearbeta designförslagen somtagits fram ytterligare genom bland annat konstruktionsritningar och tillverkningsmetoder. Ettförslag var även att företaget kunde framställa möbelben för utomhusbruk eller möbelben medhjul som tillåter förflyttning av en möbel då projektgruppen saknade detta i sortimentet.

  • 42.
    Franklin, Sebastian
    et al.
    Jönköping University, School of Engineering, JTH, Product Development.
    Liljeberg, Felix
    Jönköping University, School of Engineering, JTH, Product Development.
    Ensidesfästat fästelement: Framtagning av ensidesfästande fästelement2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The assignment, which has been carried out on behalf of Troax AB was to develop suggestions on one sided fasteners that will be used to attach the anti-collapse system for pallet racks. The problem, as it is today, is that the installers of the mesh panels for the anti-collapse system find it difficult to reach behind and inside the pallet racking beam when they screw together the screw and the nut to hold up the anti-collapse system. Therefore, there is a desire to use a fastener which does not have to handle screws or bolts on the back of the beam.

    One design requirements is that it should fit most hole patterns and hole sizes available for pallet racks today. It also has the requirement that it must hold for a pendulum test. The energy is then converted into a force for easier calculations. When a safety factor is applied the force that the system is subjected to is approximately 10KN.

    SolidWorks was used to model and structurally analyze the various design proposals. The best design proposal was put into a simulations study to be analyzed. Then the proposal was compared with the screw which is currently in use. The results of the structural analysis of the current screw show that it withstands the applied loads. The proposed suggestion lacks credibility due to the fact that the stresses shown in the simulations are too high.

    Based on the results from the structural analysis, it is concluded that further studies are needed and also that the other design suggestions should be examined further in case they could be improved to make them meet the requirements.

  • 43.
    Gallego Sánchez, Irene
    Jönköping University, School of Engineering, JTH, Product Development.
    Design of a kids' product: Furniture-toy that supports creative play2016Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    This project thesis has been developed in collaboration with a kids’ products company called Perludi, based in Graz. It all starts with an interest in developing a product for children and then getting in contact with Perludi company for this purpose. A big part of the project has been a deep research: a process of understanding how the company express their style and philosophy through their products and getting to know similar companies, products, trends and even child related information in order to get enough data to get to the type of children product to develop further.The product supports and encourage kids play and have a multifunctional aspect by changing positions or interacting by the use of the features conforming its design. Simplicity and clean design are the key characteristics that will leave enough freedom to children when playing. No instructions or rules, just stimulate their creativity even more.

  • 44.
    Ganesh, Koushik
    et al.
    Jönköping University, School of Engineering, JTH, Product Development.
    Pravin Kumar, Prithivraj
    Jönköping University, School of Engineering, JTH, Product Development.
    Mapping of development process for Tacit knowledge transfer in Product development organization: Knowledge management in change managent2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The thesis is focused on developing a set of work standards or framework to the company, Isaberg Rapid which has changed its parent company and because of it lost many of its experienced employees. Subsequently a lot of implicit knowledge is lost along with the employees, which later became evident when challenges recurred in production. The aim of the research project is to create a proof methodology to avoid this loss by storing this tacit knowledge for any references, even if the employees involved with the product are lost. 

  • 45.
    Gustafsson, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Product Development.
    Persson, Thomas
    Jönköping University, School of Engineering, JTH, Product Development.
    Utveckling av skyddslock till dryckesburk: Produktutvecklingsprocessen2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report describes a Bachelor thesis executed at Jönköping University in Mechanical engineering, specialized in product development and design by Adam Gustafsson and Thomas Persson. The thesis was made during the spring of 2018 and was the final assignment before graduation.

    Unadvised aluminum cans that are unsealed run risk for bees and wasps to intrude the can. This may have devastating consequences, not least for people with allergy to stings of bees and wasps. Therefore, a need was determined of a product that prevents stings to mouth and pharynx when it comes to drinking from a can. An assignment from Axelent Engineering became the groundwork of this report.

    The goal of was to generate suggestions of concepts with a safety lid that would eliminate risks from unsealed cans, minimize spill and preserve the characteristics of the drink. From perspective of the client demands and the issues described in the report a result could be presented. Highest priority was the development of the product but desirable was also to implement research of the market, material selection and sales preparations.

    Based on the theories and methods presented in the thesis two suggested concepts could be screened, which later was weighted to become one final concept. All concepts were compared with starting point from the requirements which revealed the final concept. The result was a compact safety lid that was the best alternative and met the requirements for manufacturing, function clarity and selected target group.

    The thesis contributed to increased knowledge in the field and gave a clear picture of how the product development process could be. The assignment resulted in a functional prototype that lays the foundation to continue develop into a finished product. The final product aim to increase the comfort and awareness among the consumer.

  • 46.
    Gustafsson, Göran
    et al.
    Chalmers tekniska högskola.
    Raudberget, Dag
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design. Chalmers tekniska högskola.
    Ström, Mikael
    Swerea IVF.
    Unveiling fundamental relationships in industrial product development2016In: Procedia CIRP / [ed] Lihui Wang, Elsevier, 2016, Vol. 50, p. 204-209Conference paper (Refereed)
    Abstract [en]

    Identification and clarification of relationships between product properties is fundamentally important in industrial product development. The process is however frequently perceived difficult. The presented research aims at clarifying if a visual tool can provide help in this work. The tool is a combination of previously known techniques and has so far been implemented at two product developing companies. Results and reactions from the tests are hitherto positive and the conclusion is therefore that this extended casual diagram can be a useful addition to the product developer's toolbox.

  • 47.
    Hansbo, Peter
    et al.
    Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization. Jönköping University, School of Engineering, JTH, Product Development.
    Burman, Erik
    Universiy College London.
    Claus, Susanne
    University College London.
    Larson, Mats G.
    Umeå University.
    Massing, André
    Simula Research Laboratory.
    CutFEM: Discretizing geometry and partial differential equations2015In: International Journal for Numerical Methods in Engineering, ISSN 0029-5981, E-ISSN 1097-0207, Vol. 104, no 7, p. 472-501Article in journal (Refereed)
    Abstract [en]

    We discuss recent advances on robust unfitted finite element methods on cut meshes. These methods are designed to facilitate computations on complex geometries obtained, for example, from computer-aided design or image data from applied sciences. Both the treatment of boundaries and interfaces and the discretization of PDEs on surfaces are discussed and illustrated numerically.

  • 48.
    Hansbo, Peter
    et al.
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Jonsson, Tobias
    Department of Mathematics and Mathematical Statistics, Umeå University, Umeå, Sweden.
    Larson, Mats G.
    Department of Mathematics and Mathematical Statistics, Umeå University, Umeå, Sweden.
    Larsson, Karl
    Department of Mathematics and Mathematical Statistics, Umeå University, Umeå, Sweden.
    A Nitsche method for elliptic problems on composite surfaces2017In: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 326, p. 505-525Article in journal (Refereed)
    Abstract [en]

    We develop a finite element method for elliptic partial differential equations on so called composite surfaces that are built up out of a finite number of surfaces with boundaries that fit together nicely in the sense that the intersection between any two surfaces in the composite surface is either empty, a point, or a curve segment, called an interface curve. Note that several surfaces can intersect along the same interface curve. On the composite surface we consider a broken finite element space which consists of a continuous finite element space at each subsurface without continuity requirements across the interface curves. We derive a Nitsche type formulation in this general setting and by assuming only that a certain inverse inequality and an approximation property hold we can derive stability and error estimates in the case when the geometry is exactly represented. We discuss several different realizations, including so called cut meshes, of the method. Finally, we present numerical examples. 

  • 49.
    Hansbo, Peter
    et al.
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Larson, Mats G.
    Umeå University.
    A posteriori error estimates for continuous/discontinuous Galerkin approximations of the Kirchhoff–Love buckling problem2015In: Computational Mechanics, ISSN 0178-7675, E-ISSN 1432-0924, Vol. 56, no 5, p. 815-827Article in journal (Refereed)
    Abstract [en]

    Second order buckling theory involves a oneway coupled coupled problem where the stress tensor from a plane stress problem appears in an eigenvalue problem for the fourth order Kirchhoff plate. In this paper we present an a posteriori error estimate for the critical buckling load and mode corresponding to the smallest eigenvalue and associated eigenvector. A particular feature of the analysis is that we take the effect of approximate computation of the stress tensor and also provide an error indicator for the plane stress problem. The Kirchhoff plate is discretized using a continuous/discontinuous finite element method based on standard continuous piecewise polynomial finite element spaces. The same finite element spaces can be used to solve the plane stress problem.

  • 50.
    Hansbo, Peter
    et al.
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Larson, Mats G.
    Department of Mathematics and Mathematical Statistics, Umeå University, Umeå, Sweden.
    A stabilized finite element method for the Darcy problem on surfaces2017In: IMA Journal of Numerical Analysis, ISSN 0272-4979, E-ISSN 1464-3642, Vol. 37, no 3, p. 1274-1299Article in journal (Refereed)
    Abstract [en]

    We consider a stabilized finite element method for the Darcy problem on a surface based on the Masud–Hughes formulation. A special feature of the method is that the tangential condition of the velocity field is weakly enforced through the bilinear form, and that standard parametric continuous polynomial spaces on triangulations can be used. We prove optimal order a priori estimates that take the approximation of the geometry and the solution into account.

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