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  • 151.
    Brodin, Håkan
    et al.
    Linköping University, Department of Mechanical Engineering, Engineering Materials. Linköping University, The Institute of Technology.
    Jinnestrand, Magnus
    ProTang Mekanikkonsulter AB Västerås.
    Johansson, Sten
    Linköping University, Department of Mechanical Engineering, Engineering Materials. Linköping University, The Institute of Technology.
    Sjöström, Sören
    Siemens Industrial Turbomachinery AB Finspång.
    Thermal Barrier Coating Fatigue Life Assessment2006In: Fatigue 2006, 2006Conference paper (Refereed)
  • 152.
    Brodin, Håkan
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Materials.
    Jinnestrand, Magnus
    Linköping University, Department of Mechanical Engineering.
    Sjöström, Sören
    Demag Delaval Industrial Turbomachinery AB .
    Fracture-mechanically based modelling of TCF life of thermal barrier coatings2003In: UTMIS Livslängdsdagar 2003,2003, 2003Conference paper (Other academic)
  • 153.
    Brodin, Håkan
    et al.
    Linköping University, Department of Mechanical Engineering, Engineering Materials. Linköping University, The Institute of Technology.
    Jinnestrand, Magnus
    Linköping University, Department of Mechanical Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
    Sjöström, Sören
    Linköping University, Department of Mechanical Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
    Modelling and experimental verification of delamination crack growth in an air-plasma-sprayed thermal barrier coating2004In: 15th European Conference of Fracture (ECF15), Stockholm, Sweden, 2004, 2004Conference paper (Refereed)
  • 154.
    Brodin, Håkan
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Materials.
    Johansson, Sten
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Materials.
    Influence on low cycle fatigue properties of bond coat oxidation for a thermal barrier coating2001In: 10th International Congres of Fracture,2001, 2001Conference paper (Refereed)
  • 155.
    Brodin, Håkan
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Materials.
    Li, X H
    Demag Delaval Industrial Turbomachinery AB, Finspång.
    Delamination crack growth in thermal barrier coatings2004In: International Thermal Spray Conference and Exposition ITSC2004,2004, 2004Conference paper (Refereed)
  • 156.
    Brodin, Håkan
    et al.
    Linköping University, Department of Mechanical Engineering, Engineering Materials. Linköping University, The Institute of Technology.
    Li, Xin-Hai
    Alstom Power Sweden, Finspång, Sweden.
    Bond Coat Influence on TBC LifeManuscript (preprint) (Other academic)
    Abstract [en]

    In the present study the influence of bond coat composition and coating process on thermal barrier coating (TBC) life has been evaluated. Six different coatings have been subjected to thermal cycling between 100 and 1100°C. After this the different systems have been characterised by light microscopy and SEM-EDS. Various commercial bond coats have been applied on one substrate material (Haynes alloy 230). The total fatigue life of the different TBC systems varies with 30% what is believed to be influenced by diffusion and oxidation phenomena in the bond coat. It is found that when the aluminium concentration is decreased phases other than alumina form at the top coat I bond coat interface. Oxides formed during later stages of the thermal cyclic test are rich in nickel, cobalt and chromium and the results can be interpreted as formation of nickel-, chromium- or spinel oxides. The reason for TBC failure is coupled to aluminium depletion, which here is believed to be due to inward diffusion and formation of thermally grown oxides (TGO) at the ceramic top coat (TC) metallic bond coat (BC) interface as well as growth of internal oxides in the bond coat.

  • 157.
    Brodin, Håkan
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Materials.
    Li, Xin-Hai
    ALSTOM Power Sweden Finspång.
    Bond Coat Influence on TBC Life2002In: Turbin Forum, Advanced Coatings for High Temperatures,2002, 2002Conference paper (Refereed)
  • 158.
    Brodin, Håkan
    et al.
    Linköping University, Department of Mechanical Engineering, Engineering Materials. Linköping University, The Institute of Technology.
    Li, Xin-Hai
    Demag Delaval Industrial Turbomachinery AB, Finspång, Sweden.
    Bond coat influence on thermal fatigue behaviour of thermal barrier coatingsManuscript (preprint) (Other academic)
    Abstract [en]

    In the present study the influence of bond coat composition and coating process on thermal barrier coating (TBC) life has been evaluated. Six different coatings have been subjected to thermal cycling between 100 and 1100°C. After this the different systems have been characterised by light microscopy and SEM-EDS. Various commercial bond coats have been applied on one substrate material (Haynes alloy 230). The total fatigue life of the different TBC systems varies with 30% what is believed to be influenced by diffusion and oxidation phenomena in the bond coat. It is found that when the aluminium concentration is decreased phases other than alumina form at the top coat / bond coat interface. Oxides formed during later stages of the thermal cyclic test are rich in nickel, cobalt and chromium and the results can be interpreted as formation of nickel-, chromium- or spinel oxides. The reason for TBC failure is coupled to aluminium depletion, which here is believed to be due to inward diffusion and formation of thermally grown oxides (TGO) at the ceramic top coat (TC) metallic bond coat (BC) interface as well as growth of internal oxides in the bond coat.

  • 159.
    Brogård, Hanna
    Linköping University, Department of Mechanical Engineering.
    Eklektisism: Hur jag tolkar min samtid2006Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    During spring 2005 I, Hanna Brogård, undertook my bachelor degree project in furniture design. The supervisors were Glenn Henningsson at Njudex in Vrigstad and Leó Jóhannson, teacher and examiner at Carl Malmsten CTD in Stockholm.

    The project was based on three elements:

    • Design concept for upholstered furniture
    • Cooperate together with a sofa producer for professional supervision and to learn more about industrial production and upholstery technique
    • Learn more about furniture history of style

    I contacted a sofa producer called Njudex, in the province of Småland, who became my work partner during this project. Eclecticism is the name of the furniture styles that became popular during the mid-nineteenth century. It develops from a new, rich society class arisen from industry and trade. The trend is based on the escape from reality to dreams of foreign countries, past centuries and nature. During the end of the nineteenth century the upholsterers get a greater importance when the textile industry develops and refines. The stressed, contemporary man should be protected against noise, hard shapes and bright light. In cooperation with Njudex, my ambition was to develop an upholstered piece of furniture for the living room. This product would complement their selection and strengthen their trademark. I built the prototype at Njudex’s factory to learn more about their production. The collaboration resulted in a sofa concept of modules with adjustable backs.

    Download full text (pdf)
    FULLTEXT01
  • 160.
    Broman, Martin
    et al.
    IVF .
    Eskilander, Stephan
    IVF .
    Säfsten, Kristina
    Linköping University, Department of Mechanical Engineering.
    Interaction between Assembly System Suppliers and Their Customers2000In: Cirp International Seminar on Manufacturing Systems,2000, 2000Conference paper (Other academic)
  • 161.
    Bröte, Staffan
    Linköping University, Department of Mechanical Engineering.
    Manufacturing Strategy and Production System Design - Linking Strategic Decisions to Production System Design Decomposition1999In: Managing Operations Network, EurOMA Conference,1999, 1999Conference paper (Other academic)
  • 162.
    Bröte, Staffan
    et al.
    Linköping University, Department of Mechanical Engineering.
    Cochran, David
    Massachusetts Institute of Tgnology Steve Rupp.
    Mierzjewska, Ania
    Massachusetts Institute of Tgnology Steve Rupp.
    Carrus, Brandon
    Massachusetts Institute of Tgnology Steve Rupp.
    Integrating The Production Information System With Manufacturing Cell Design - A Lean Linked Cell Production System Design Implementation1999In: International Automotive Manufacturing Conference Exposition,1999, 1999Conference paper (Refereed)
  • 163.
    Burström von Malmbor, Fredrik
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Environmental Technique and Management.
    Corporate Strategy in Climate Change Mitigation: Institutional and Transaction cost Perspectives on Corporate Participation in Kyoto Project Mechanisms.2004In: 2nd Joint Research Workshop, Business and Emissions Trading University of Wittenberg-Halle,2004, 2004Conference paper (Other academic)
  • 164.
    Bylow, Matthias
    Linköping University, Department of Mechanical Engineering.
    Hållfasthetsanalys av gaffeltruckar2005Independent thesis Basic level (professional degree)Student thesis
    Abstract [sv]

    Det här examensarbetet har utförts inom civilingenjörsutbildningen för Maskinteknik vid Linköpings tekniska högskola i samarbete med SB Truck AB. Syftet med examensarbetet var att undersöka ett antal truckmodeller för att bestämma infästningsbultarnas belastning samt hur spänningarna fördelas i de olika stativen. Infästningsbultarna håller ihop stativet och chassit.

    För att kunna genomföra beräkningarna med varierande stativlängder har ett excel-blad utformats, där det är möjligt att beräkna både krafterna på infästningarna och den totala förskjutningen.

    Belastningarna på modell TTFYI har beräknats både för hand och i Pro Mechanica. Resultaten för beräkningarna blev 3,9 kN respektive 3,7 kN. Resultat för övriga stativ finns tabellerade i resultatkapitlet.

    Spänningarna blir generellt sett låga i samtliga stativ på den analyserade modellen. Gaffelvagnen utsätts för höga spänningskoncentrationer vid sammanfogningen mellan gaffelbenen och gaffelbröstet. För övriga stativ blir spänningskoncentrationerna relativt låga, med undantag från områdena där lasterna appliceras.

    Download full text (pdf)
    FULLTEXT01
  • 165.
    Byman, Karin
    Linköping University, Department of Mechanical Engineering, Energy Systems. Linköping University, The Institute of Technology.
    Systemanalytisk energimodell som beslutsverktyg: Borlänge och andra kommuner i Dalarna1999Licentiate thesis, monograph (Other academic)
    Abstract [en]

    The hypothesis is that "a system optimisation model can be a powerful tool to produce basic data for strategic decision making in a local energy company". Another question is: do the companies trust the results? The model used is MODEST, which is a model for energy-system optimisation, built on linear programming. The local energy system in the municipality of Borlänge, has been analysed by means of MODEST and at the same time a traditional study has been carried out by an experienced energy-consultant. Both investigations were made under exactly the same conditions but totally independent of each other. Both studies came to same conclusions, and this was very important for the continued work.

    A more extensive investigation was made when five communities, including Borlänge, joined to analyse the optimal energy supply in the region of Dalarna. The other communities are Hedemora, Säter, Avesta and Falun. By following the decision-making process in Borlänge and the other communities it has been possible to judge the usefulness of the MODEST mode! and the concept of energy system analyses that goes with it. The energy companies were interviewed about their experiences of the model. They all agree that they have confidence in the model, as the results correspond with their own calculations and knowledge of their energy systems. The process is easy to follow and the inputs to the model are data that always have to be processed in an investigation of a new investment or other changes of the energy supply. The result of the analysis is easy to comprehend.

    Regarding Borlänge a decisive strategic decision has not yet been made. That depends on external insecurities on the energy market which are outside the modelling process. Not making a decision is also a strategic act. Based on the results of the analysis that have been made during the period of this work, 1997-1999, Borlänge Energy has decided to postpone the final decision for two or three years. The president of Borlänge Energy, Anders Lindberg, says that when it is time to make a strategic decision they will use the model again. The other energy companies also agree that their future decisions will be built on the results of the MODEST-analyses.

    The conclusions of the thesis state that the system-analyses model MODEST calculates correctly and the concept of the analysing process is well adapted to a local energy system. The systematic way in which the analysing process is carried out stimulates the creativity and creates an active learning process among the participants. The results are trustworthy.

  • 166.
    Bäckman, Jonas
    Linköping University, Department of Mechanical Engineering, Engineering Materials. Linköping University, The Institute of Technology. Div. of Compnent Technology, School of Engineering, Jönköping University.
    Processing Aspects for Improving Mechanical Properties in Aluminium Castings2000Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The relation between the process and mechanical properties in aluminium alloys for castings has been examined. The relation was hard to define since the spread in data was severe due to defects created in the casting process. To avoid such defects a gradient solidification equipment was built. With this equipment it is possible to re-melt and solidify meta! with good feeding during the solidification over a !arge range of solidification rates. The results show very good mechanical properties for several cast aluminium alloys. From this it is concluded that the casting processes used today are not designed in a way that utilises the inherent potential in mechanical properties of the material.

    The ingate system design has been found to be one of the most important factors that influence the mechanical properties in castings. In this work many experiments have been made in order to study the mould filling behaviour. By the use of a glass wall and a video camera the mould filling of a vertically parted vacuum-sealed sand mould was studied. By changing the ingate system design and studying the filling sequences a thorough knowledge of the melt behaviour in the ingate system during the filling of the mould could be obtained. This knowledge could be used in many foundries to improve the ingate system design in order to increase the quality ofthe castings.

    A filter in the ingate system has been found to be one of the best ways to improve the mould filling. The filter will however reduce the flow, rate and it is therefore important to know the magnitude of the flow reduction. In this work a new technology is presented which can be used to obtain optimum proper filter parameters, which are important to get accurate results from simulations.

  • 167.
    Caldenfors, Dag
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    A method for modelling and simulation of joint driver-vehicle performance at vehicle handling limits2004In: International Conference on Engineering Design,2003, Stockholm, Sweden: ICED'03 , 2004Conference paper (Refereed)
  • 168.
    Caldenfors, Dag
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Identification of joint driver-vehicle performance in car skidding recovery tasks2004In: Symposium on Automated Systems based on Human Skill and Knolwdge,2003, Gothenburg, Sweden: IFAC2003 , 2004Conference paper (Refereed)
    Abstract [en]

         

  • 169.
    Caldenfors, Dag
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Dekker, Sidney
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Smith, Christian Skinner
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    An Initial Model of Driver-Vehicle Performance in Recovery from Skids on Icy Roads2006In: 50th Annual Meeting of the Human Factor and Ergonomics Society,2006, San Fransisco: Human Factors and Ergonomic Society , 2006Conference paper (Refereed)
    Abstract [en]

     Closed-loop instability caused by excess phase lag has been studied widely in aviation. Here we develop and test a model of its counterpart in vehicle-driver-coupling, where participants were asked to recover from a skid on a slippery road. We model the damping effect of sucessful recovery as viscoelastic behavior. Oscillation number is the predictor variable; steering wheel angle is the response variable. 

  • 170.
    Cao, Haiping
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Characteristics of cast magnesium alloys: microstructures, defects and mechanical properties2005Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Magnesium is the lightest of all structural metals. As such, and combined  with good mechanical and physical properties, it forms the basis for commercial alloys that have found successful use in a wide variety of applications. The work presented in this thesis has aimed to investigate the characteristics of microstructures and defects in cast magnesium alloys, as well as how they influence the mechanical properties.

    The microstructural features of binary Mg-Al alloys with various Al concentrations were investigated under a range of cooling conditions. The experiments were done by using a gradient solidification technique to achieve homogeneous and nearly defectfree magnesium alloy specimens, through which the isolated effect of microstructural parameters on the mechanical properties could be evaluated. Some models were developed to describe the relationships between the microstructure and mechanical properties in the Mg-Al alloys. In this work, it was also found that the mechanical properties of cast Mg components were affected by some non-structural factors. It is proposed that mould constraints in the die during cooling can have a significant effect on the yield strength of die-cast magnesium components.

    Investigations were also done concerning the characteristics of the microstructure, especially the so called pre-solidified crystals, as well as two common defects, segregation bands and hot-tears, in die-cast Mg components. The effects of process parameters on the formation of the microstructure and these defects were thoroughly investigated in some high pressure die cast commercial components. Applying a high intensification pressure was found to have a strong effect in minimizing the segregation band formation, however at the same time promoting the formation of hot tears. A new theory describing the mechanisms for segregation band formation is proposed. The theory was confirmed by simulations of solidification process during die casting, and by experimental verification. The tensile stresses built up in the residual liquid due to the solidification (and cooling) shrinkage of the casting, which causes a pressure drop and viscous flow of enriched liquid inside the mushy zone, is believed to be the main reason for segregation band formation.

    In order to be able to produce premium quality and cost effective Mg components, a new semi-solid casting process was developed. The process, called Rapid Slurry Forming (RSF), is based on a rapid but precise control of the enthalpy of the metal, thereby permitting the operator to obtain the desired solid fraction in the slurry. By using this process, large amounts of high quality semi-solid slurry can be produced in some minutes. This new technology opens up possibilities for producing Mgcomponents with well described microstructures, low defect contents and good mechanical properties.

    List of papers
    1. Effect of microstructure on mechanical properties of as-cast Mg-Al alloys
    Open this publication in new window or tab >>Effect of microstructure on mechanical properties of as-cast Mg-Al alloys
    2004 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 35, no 1, p. 309-319Article in journal (Refereed) Published
    Abstract [en]

    The mechanical properties of Mg-Al alloys are mainly determined by the microstructure, i.e., the amount and morphology of the phases, but also by the presence of defects arising from the melt handling and casting process. In order to obtain information about the isolated effect of the microstructure, it is, therefore, necessary to minimize the amounts of defects. In this study, this has been achieved by remelting and solidifying the alloys in a gradient furnace. The drawing rate was varied from 0.3 to 6 mm/s, which yielded a wide variety of microstructures. Three samples were produced for each parameter set, in order to have a statistical basis for the evaluation. The results showed that homogeneous and reproducible samples could be produced, and that the tensile properties obtained showed a very small scatter. The effects of microstructural parameters such as grain size, secondary dendrite arm spacing (SDAS), eutectic fraction, and eutectic morphology on the yield strength, ultimate tensile strength (UTS), fracture elongation, and hardness has been investigated.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-85320 (URN)10.1007/s11661-004-0132-6 (DOI)
    Available from: 2012-11-16 Created: 2012-11-16 Last updated: 2017-12-07
    2. Modeling of microstructure: mechanical property relations in cast Mg-Al alloys
    Open this publication in new window or tab >>Modeling of microstructure: mechanical property relations in cast Mg-Al alloys
    2003 (English)In: International Conference on Modeliing of Casting Welding and Advanced Solidification Processes X, 2003, p. 165-172Conference paper, Published paper (Refereed)
    Abstract [en]

    Binary MG-Al alloys ranging from 3-15 wt% Al have been investigated by gradient solidification techniques, which gives homogeneous and nearly defect-free tensile test samples. Based on the experimental results, models have been developed which describe the effect of microstructiral parameters and cooling conditions, such as grain size of α-pohase, volume fraction of the eutectic phase and cooling rate, on the tensile properties, such as hardness, yield strenght and fracture elongation.

    Keywords
    Mg-Al alloys, gradient solidification, modelling, microstructure, mechanical properties, hardness, elongation, yield strength, tensile strenght, divorced euectic
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-30038 (URN)15491 (Local ID)15491 (Archive number)15491 (OAI)
    Conference
    International Conference on Modelling of Casting Welding and Advanced Solidification Provesses X, Sandestin, Florida, May 25-30, 2003
    Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2013-11-04
    3. On the reliability of yield strength data evaluated from as-cast tensile test bars of Mg-alloys
    Open this publication in new window or tab >>On the reliability of yield strength data evaluated from as-cast tensile test bars of Mg-alloys
    2003 (English)In: Magnesium: Proceedings of the 6th International Conference Magnesium Alloys and Their Applications / [ed] Karl U. Kainer, 2003, p. 501-506Conference paper, Published paper (Other academic)
    Abstract [en]

    Within the automotive sector, energetic efforts are today being made to decrease vehicle weight in order to minimize the emission of combustion gases. In the light of this work it is natural that the use of light metals, and especially magnesium, has increased considerably during the last 5-10 years. Some applications in cars where cast magnesium components are used today include seat frames, instrument panels, transfer cases, wheels, steering wheels and various kinds of housings.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-85345 (URN)10.1002/3527603565.ch79 (DOI)
    Conference
    6th International Conference on Magnesium Alloys and Their Applications, Wolfsburg, Germany
    Available from: 2012-11-19 Created: 2012-11-19 Last updated: 2013-11-04
    4. The effect of mould constraints on the 0.2% proof stress of as-cast Mg-Al alloys
    Open this publication in new window or tab >>The effect of mould constraints on the 0.2% proof stress of as-cast Mg-Al alloys
    2005 (English)In: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 488-489, p. 165-168Article in journal (Refereed) Published
    Abstract [en]

    When a casting solidifies and cools down in a metallic mould, stresses and strains develop as a result of uneven temperature distributions, metal shrinkage and mould constraints. At ejection from the mould, the casting usually springs back slightly when the elastic part of the strain is released. However, due to the low flow stress at high temperatures it is likely that the casting also has experienced some plastic deformations, meaning that the dislocation density has increased. This paper discusses how the existence of remaining plastic deformations affects the initial flow behavior and the yield strength during tensile testing of as cast Mg-Al alloys with different degrees of mould constraints.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-85346 (URN)10.4028/www.scientific.net/MSF.488-489.165 (DOI)
    Available from: 2012-11-19 Created: 2012-11-19 Last updated: 2017-12-07
    5. Characteristics of microstructure and banded defects in die cast AM50 magnesium components
    Open this publication in new window or tab >>Characteristics of microstructure and banded defects in die cast AM50 magnesium components
    2005 (English)In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 18, no 6, p. 377-384Article in journal (Refereed) Published
    Abstract [en]

    A number of commercial AM50 magnesium alloy components have been die cast under various casting conditions. The influence of process parameters on the microstructural features as well as on the defect known as the 'segregation band defect' were investigated. It was found that pouring temperature and injection speed have obvious effects on the morphology of presolidified crystals inside the casting. More presolidified crystals were formed under the condition of lower pouring temperature, and more broken dendrites and spherical crystals were formed under higher injection speed. A variety of segregation band morphologies and the influence of various casting conditions on the appearance of band type defects were examined. It was discovered that intensification pressure has the strongest influence on the appearance of segregation bands inside the castings. By applying high intensification pressure, the risk of tearing along the bands and the segregation levels inside the band were both dramatically decreased. The influence of band defects on the mechanical properties of the components was established.

    Keywords
    Small and medium sized enterprises, decision criteria, manufacturing characteristics
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-85348 (URN)10.1179/136404605225023216 (DOI)
    Available from: 2012-11-19 Created: 2012-11-19 Last updated: 2017-12-07
    6. Mechanisms of segregation band defect formation in pressure die-cast magnesium components
    Open this publication in new window or tab >>Mechanisms of segregation band defect formation in pressure die-cast magnesium components
    2005 (English)In: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 488-489, p. 381-384Article in journal (Refereed) Published
    Abstract [en]

    Segregation bands which normally follow the outer contours of a casting are common in commercial magnesium alloy pressure die castings. Several models have been proposed in the literatures which attempt to explain mechanisms behind the formation of this type of segregation bands. However, it is difficult to explain some phenomena which occur in real die cast components. In this paper, a new theory concerning the formation of one common and detrimental segregation band defect (Type I) has been proposed, which is based on a coupled analysis of heat flow and volume changes during solidification. The formation of this type bands was related to a pressure drop in the liquid and resulting flow of segregated liquid from the surrounding two-phase regions. Mechanism on the formation of the other type segregation band (Type II or under surface band) is also proposed. The sudden increase of cooling rate at the moment of applying intensification pressure is believe to has main contribution to the formation of this type of bands.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-85349 (URN)10.4028/www.scientific.net/MSF.488-489.381 (DOI)
    Available from: 2012-11-19 Created: 2012-11-19 Last updated: 2017-12-07
    7. Processing effects on hot tearing tendencies of die-cast magnesium components
    Open this publication in new window or tab >>Processing effects on hot tearing tendencies of die-cast magnesium components
    (English)Manuscript (preprint) (Other academic)
    Abstract [en]

    A commercial AM50 Mg component was die cast with various process parameter settings. It was found that many of the process parameter settings investigated had a significant effect on the tendency for hot tears to form in critical sections of the component. A fast cavity filling helped to reduce the hot tearing tendency. This was explained by smaller temperature variations inside the casting immediately after cavity filling, which would cause less thermal stresses to form during solidification. Shorter mould opening time was also found to decrease the hot tearing tendency as a result of reduced tensile stresses inside the casting before mould opening. Severe hot tears formed when using an increased intensification pressure. In an attempt to explain this observation, numerical calculations were performed to investigate how the intensification pressure affects the solidification rate and the fraction solid gradients across the casting. It was found that a higher intensification pressure gives rise to steeper temperature gradients and fraction solid gradients during solidification between the surface and the centre of the casting. This would facilitate the initiation of hot tears but also flow of segregated liquid into the opening tears. It was also observed that hot tears in many cases have been filled, partially or even completely, by strongly segregated liquid, which in the Mg-Al system solidifies into a very brittle material.

    Keywords
    Mg alloy, die casting, hot tearing, process parameters, numerical calculation
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-85351 (URN)
    Available from: 2012-11-19 Created: 2012-11-19 Last updated: 2012-11-19
    8. RSF: an innovative semi-solid forming process for manufacturing of MG components
    Open this publication in new window or tab >>RSF: an innovative semi-solid forming process for manufacturing of MG components
    (English)Manuscript (preprint) (Other academic)
    Abstract [en]

    Semi-solid forming is a promising process for manufacturing metal components. The characteristics of semi-solid forming processes are described in this paper. Some commercial semi-solid forming processes as well as its advantages and disadvantages are also discussed. A new developed semi-solid forming process called Rapid Slurry Forming (RSF) process is introduced. The RSF process is based on the enthalpy exchange between at least two alloy systems having different enthalpies, with the aim of forming semi-solid slurry with a desired solid fraction. By using this process large amounts of high quality metal slurry can be produced in a short time. Experimental work has been done to produce AM60 and AZ91 slurries. Satisfied results were achieved, which demonstrated that the RSF process is a suitable and promising process for semi-solid manufacturing ofMg components.

    Keywords
    Semi-solid, RSF, enthalpy exchange, Mg alloy, process, high integrity
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-85352 (URN)
    Available from: 2012-11-19 Created: 2012-11-19 Last updated: 2012-11-19
  • 171.
    Cao, Haiping
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    On the microstructure and mechanical properties of Mg-Al alloys2004Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The microstructural features and the mechanical properties of binary Mg-Al alloys have been investigated by using a gradient solidification technique. Homogeneous and nearly defect-free samples were produced under well controlled cooling conditions, through which the microstructural characteristics as well as the relationships between microstructure and mechanical properties in Mg-AI alloys were precisely defined.

    It was found that the eutectic structure Mg-AI alloys becomes more and more divorced when increasing the cooling rate and by decreasing the AI concentration. A concept called divorced degree is introduced in this work to quantify the divorced level of the alloys, by which other structural parameters can be also quantified, including the eutectic fraction and, solid solution aluminium concentrations in the matrix. Concerning the relation between the microstructure and mechanical properties, it is found that yield strength and hardness are mainly dependent on the structural spacings (grain sizes and dendrite arm spacing, DAS) and solid solution aluminium content in the a-phase. For higher aluminium containing alloys (larger than 10wt% AI) the rigid eutectic networks will also contribute to the strength and hardness. All the microstructural parameters contribute to the ultimate tensile strength (UTS) as well as fracture elongation of the alloys. The premium combination was found in Mg-8AI alloy, where the highest UTS and relatively high elongation can be achieved. Mathematical modeling has been performed to relate the microstructural parameters and casting conditions, such as grain size, volume fraction of different phases, solid solute AI concentration and cooling rate, to the mechanical properties of the alloys, including yield strength, hardness and fracture elongation. The distinguishing differences in the mechanical behaviour between pressure die-cast magnesium alloy components and other casting processes were also investigated. The differences were related to mould constraint in the die during the cooling sequence.

    One special and severe defect called segregation band which occurs in die-cast magnesium alloy components has also been investigated. A new theory to describe the segregation band formation mechanism during die casting has been proposed in this work. The tensile stresses built up in the residual liquid due to the solidification (and cooling) shrinkage of the casting, which cause a pressure drop and viscous flow of enriched liquid inside the mushy zone, is believed to be the main reason for segregation band formation.

    List of papers
    1. Effect of microstructure on mechanical properties of as-cast Mg-Al alloys
    Open this publication in new window or tab >>Effect of microstructure on mechanical properties of as-cast Mg-Al alloys
    2004 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 35, no 1, p. 309-319Article in journal (Refereed) Published
    Abstract [en]

    The mechanical properties of Mg-Al alloys are mainly determined by the microstructure, i.e., the amount and morphology of the phases, but also by the presence of defects arising from the melt handling and casting process. In order to obtain information about the isolated effect of the microstructure, it is, therefore, necessary to minimize the amounts of defects. In this study, this has been achieved by remelting and solidifying the alloys in a gradient furnace. The drawing rate was varied from 0.3 to 6 mm/s, which yielded a wide variety of microstructures. Three samples were produced for each parameter set, in order to have a statistical basis for the evaluation. The results showed that homogeneous and reproducible samples could be produced, and that the tensile properties obtained showed a very small scatter. The effects of microstructural parameters such as grain size, secondary dendrite arm spacing (SDAS), eutectic fraction, and eutectic morphology on the yield strength, ultimate tensile strength (UTS), fracture elongation, and hardness has been investigated.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-85320 (URN)10.1007/s11661-004-0132-6 (DOI)
    Available from: 2012-11-16 Created: 2012-11-16 Last updated: 2017-12-07
    2. Modeling of microstructure: mechanical property relations in cast Mg-Al alloys
    Open this publication in new window or tab >>Modeling of microstructure: mechanical property relations in cast Mg-Al alloys
    2003 (English)In: International Conference on Modeliing of Casting Welding and Advanced Solidification Processes X, 2003, p. 165-172Conference paper, Published paper (Refereed)
    Abstract [en]

    Binary MG-Al alloys ranging from 3-15 wt% Al have been investigated by gradient solidification techniques, which gives homogeneous and nearly defect-free tensile test samples. Based on the experimental results, models have been developed which describe the effect of microstructiral parameters and cooling conditions, such as grain size of α-pohase, volume fraction of the eutectic phase and cooling rate, on the tensile properties, such as hardness, yield strenght and fracture elongation.

    Keywords
    Mg-Al alloys, gradient solidification, modelling, microstructure, mechanical properties, hardness, elongation, yield strength, tensile strenght, divorced euectic
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-30038 (URN)15491 (Local ID)15491 (Archive number)15491 (OAI)
    Conference
    International Conference on Modelling of Casting Welding and Advanced Solidification Provesses X, Sandestin, Florida, May 25-30, 2003
    Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2013-11-04
    3. On the reliability of yield strength data evaluated from as-cast tensile test bars of Mg-alloys
    Open this publication in new window or tab >>On the reliability of yield strength data evaluated from as-cast tensile test bars of Mg-alloys
    2003 (English)In: Magnesium: Proceedings of the 6th International Conference Magnesium Alloys and Their Applications / [ed] Karl U. Kainer, 2003, p. 501-506Conference paper, Published paper (Other academic)
    Abstract [en]

    Within the automotive sector, energetic efforts are today being made to decrease vehicle weight in order to minimize the emission of combustion gases. In the light of this work it is natural that the use of light metals, and especially magnesium, has increased considerably during the last 5-10 years. Some applications in cars where cast magnesium components are used today include seat frames, instrument panels, transfer cases, wheels, steering wheels and various kinds of housings.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-85345 (URN)10.1002/3527603565.ch79 (DOI)
    Conference
    6th International Conference on Magnesium Alloys and Their Applications, Wolfsburg, Germany
    Available from: 2012-11-19 Created: 2012-11-19 Last updated: 2013-11-04
    4. On the mechanism of segregation band formation and its influence on the mechanical properties of pressure die cast magnesium alloys
    Open this publication in new window or tab >>On the mechanism of segregation band formation and its influence on the mechanical properties of pressure die cast magnesium alloys
    (English)Manuscript (preprint) (Other academic)
    Abstract [en]

    Segregation bands which follow the contours of the outer surfaces of the casting are not uncommon in commercial magnesium pressure die castings. The presence of this type of defect has a strong detrimental effect on the mechanical properties. A few models have been proposed which tries to explain mechanisms behind the formation of this type of segregation bands. However, it is difficult to explain some phenomena which occur in real die cast components, using the models previously proposed. In this paper, a new model was suggested which is based on a coupled analysis of heat flow and volume changes during solidification. The formation of segregation bands was related to the pressure drop in the liquid, and the resulting flow of segregated liquid from the surrounding two-phase regions. Methods to prevent or decrease the formation of segregation bands have also been proposed and experimentally verified on real industrial castings. Finally, the influence of this type of defect on the mechanical properties of industrial castings has been studied and is presented in this paper.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-100379 (URN)
    Available from: 2013-11-04 Created: 2013-11-04 Last updated: 2013-11-04
  • 172.
    Cao, Haiping
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Materials.
    Wessén, Magnus
    Komponentteknologi Ingenjörshögskolan i Jönköping.
    Influence of microstructure on mechanical properties in Mg-Al casting alloys2002In: International Conference on High Tech Die Casting Associazione Italiana di Metallurgica,2002, 2002Conference paper (Refereed)
  • 173.
    Carlson, A
    Linköping University, Department of Mechanical Engineering, Energy Systems. Linköping University, The Institute of Technology.
    Energy system analysis of the inclusion of monetary values of environmental damage2002In: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 22, no 3, p. 169-177Article in journal (Refereed)
    Abstract [en]

    This is an analysis of the effect on the technical solution when monetary values of externalities are included in a model for optimising energy systems. The focus of the study is on heating in domestic houses, non-residential premises, multi-dwelling buildings and district heating systems. The included monetary values of damage to the environment and health are those resulting from atmospheric emissions Of CO2, NOx, SO2 and particulates. The estimates are taken from the literature. An optimising method based on linear programming is used and the result is an optimal mix of energy carriers as well as new and existing heating plants that minimise the costs of satisfying a demand for heat. Furthermore, a calculation is made of the externality cost resulting from the energy system. The analysis makes it possible to compare the technical and economic differences of an energy system based on business economics to a system with greater emphasis on socio-economics. Generally speaking, it is cost-effective to take externality costs into consideration at the planning stage instead of correcting the damage later. The results show that by considering externality costs the total discounted cost of the energy system would be approximately 30% lower than today. Furthermore, the use of pellets and wood chips should be substantially larger in all of the studied regions. (C) 2002 Elsevier Science Ltd. All rights reserved.

  • 174.
    Carlson, A
    Linköping University, Department of Mechanical Engineering, Energy Systems. Linköping University, The Institute of Technology.
    Energy systems and the climate dilemma - Reflecting the impact on CO2 emissions by reconstructing regional energy systems2003In: Energy Policy, ISSN 0301-4215, E-ISSN 1873-6777, Vol. 31, no 10, p. 951-959Article in journal (Refereed)
    Abstract [en]

    Global warming is one of the most important environmental issues today. One step for the European Union to fulfil the Kyoto protocol, stating a worldwide decrease of emissions of greenhouse gases, is to treat the environment as a scarce resource by attributing costs for environmental impact. This accompanied with considering the European electricity market as one common market, where coal condensing power is the marginal production, lead to the possibility to reduce CO2-emissions in Europe by reconstructing energy systems at a local scale in Sweden. A regional energy system model is used to study possibilities to replace electricity and fossil fuel used for heating with biomass and how a reconstruction can affect the emissions of CO2. An economic approach is used where cost-effective technical measures are analysed using present conditions and by including monetary values of externalities. The analysis shows that, by acting economically rational, a large amount of electricity and fossil fuel should, in three Out Of four cases, be replaced leading to a substantial reduction of CO2 emissions. (C) 2002 Elsevier Science Ltd. All rights reserved.

  • 175.
    Carlson, Annelie
    Linköping University, Department of Mechanical Engineering, Energy Systems. Linköping University, The Institute of Technology.
    On cost-effective technical measures to avoid environmental damage of regional energy systems2002In: International journal of energy research (Print), ISSN 0363-907X, E-ISSN 1099-114X, Vol. 26, no 12, p. 1103-1115Article in journal (Refereed)
    Abstract [en]

    The production of heat and electricity can cause large environmental impacts and, hence, large costs for society. Those are costs that are seldom taken into consideration. An important question is how the future technical energy systems should be formed if environmental costs were considered as any other good or service, such as raw material, capital and labour. This study comprises cost-effective technical measures when monetary values of external effects are included in an energy system analysis. It is an analysis of how the present energy system can for society be cost-effectively reconstructed to be more sustainable. A regional energy system model has been developed to perform the study and it concentrates upon production of heat in single-family houses, multi-dwelling buildings, non-residential promises and district heating systems. The analysis adopts a business economic perspective, using present prices of energy carriers, and a more socio-economic perspective, in which external costs are included. The result of the analysis is the optimal mix of energy carriers as well as new and existing heating plants that minimizes the costs of satisfying a demand for heat. The results show that it is profitable to invest in new heating plants fuelled with woody biomass. Furthermore, the external costs arising with satisfying the demand for heat can decrease substantially, 60%, by carrying through with the investments that are cost-effective according to the institutional rules valid today. When monetary values of external costs are taken into consideration, this number is additional 5-percentage points lower. It is shown that if environmental costs are included it is more expensive to continue with business as usual than it is to reconstruct and run a more sustainable energy system.

  • 176.
    Carlsson, Annelie
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering.
    Taking external effects into consideration - the bompetitiveness of biofuel2001In: 1st World Conference and Exhibition on Biomass for Energy and Industy,2000, 2001Conference paper (Other academic)
    Abstract [en]

       

  • 177.
    Carlsson, Magnus
    et al.
    Linköping University, Department of Mechanical Engineering.
    Kristoffersson, Daniel
    Linköping University, Department of Mechanical Engineering.
    Automatiskt avvägningssystem för obemannad undervattensfarkost2005Independent thesis Basic level (professional degree)Student thesis
    Abstract [en]

    This master thesis work was done at Saab Underwater Systems AB, a company at the cutting edge of underwater technology. Here torpedoes and other underwater vehicles are developed and manufactured. The major customers are navies of different countries, mostly the Swedish navy.

    The aim of this master thesis is to develop, construct and evaluate an automatic Trim System for Unmanned Underwater Vehicles. The task of the system is to change the position of the centre of mass and the vehicle’s total mass or volume. A system like this gives more opportunities like improved low speed properties, manoeuvre ability and energy consumption.

    Different ways to make this change of total mass and position of centre of mass has been discussed and a choice has been done. A system of chosen concept has then been developed, constructed and evaluated. A part of big importance in this report is the work with simulations to predict the performance of the system and its behaviour. Other big parts has been to find suiting components and to develop the control electronics of the system.

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    FULLTEXT01
  • 178.
    Chai, Guocai
    et al.
    RD Centre Sandvik Materials Technology, Sandviken.
    Johansson, Sten
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Materials.
    Transitions of Faatigue Crack Initgiation from Surface, Subsurface to SNDFCO2006In: ECF16 16th European Conference of Fracture,2006, 2006Conference paper (Refereed)
  • 179.
    Chen, Fang
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering.
    Localization of 3-D sound presented through headphone - Duration of sound presentation and localization accuracy2003In: Journal of The Audio Engineering Society, ISSN 0004-7554, Vol. 51, no 12, p. 1163-1171Article in journal (Refereed)
    Abstract [en]

    The relationship between the duration of a sound presentation and the accuracy of human localization is investigated. The three-dimensional sound is presented via headphones. The head-tracking system was integrated together with the sound presentation. Generalized head-related transfer functions (HRTFs) are used in the experiment. Six different types of sounds with durations of 0.5, 2, 4, and 6 seconds were presented in random order on any azimuth in the horizontal plane. Thirty subjects participated in the study. A special location indication system called DINC (directional indication compass) was developed. With DINC the judged location of every test can be recorded accurately. The results showed that the localization accuracy is significantly related to the duration of the sound presentation. As long as the sound has a broad frequency bandwidth, the sound type has little effect on the localization accuracy. A presentation of at least 4-second duration is recommended. There is no significant difference between male and female subjects in the accuracy of detection.

  • 180. Cherp, Aleh
    et al.
    Emilsson (Gustafsson), Sara
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Environmental Technique and Management.
    Hjelm, Olof
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Environmental Technique and Management.
    Strategic Environmental Assessment and Management in Local Authorities in Sweden2006Report (Other academic)
    Abstract [en]

      

  • 181.
    Christensson, Pär
    et al.
    Linköping University, Department of Mechanical Engineering.
    Eriksson, Mikael
    Linköping University, Department of Mechanical Engineering.
    Spänningsanalys av axel-länkmekanism på borr-rigg2005Independent thesis Basic level (professional degree)Student thesis
    Abstract [en]

    This master thesis is intended to give an increased understanding of the stress state in an axle, which is assembled in one of Atlas Copco’s mountain drilling rigs. The main problems investigated were how the axle is affected when the bearing is worn, when the pretension is varied, and how to dimension the axle. Answers to these questions were found by using hand calculations, practical testing and with Finite Element analyzes. The dimensioning of the axle is currently based on the bending stress, but the author’s opinion is that the axle should be dimensioned considering the equivalent stress. Wear and pretension had large influence on the strain along the axle, but almost no influence on the shear stress and on the equivalent stress. Maximum equivalent stress occurs in the same place on the axle independently on wear and pretension, except for one case. This particular case is, however, not likely to occur. The maximum equivalent stress occurs inside the axle, at the hole which the pretension bolt goes through. This equivalent stress depends mostly on a shear stress concentration which occurs inside the axle. Theshear stress concentration was verified with a number of different FEM-models with various geometries, and with theory. The concentration depends on the geometry of the axle, and it occurs where the expansion bushings ends, but on the inside of the axle. The shear stress concentration is approximately two and a half time bigger than the stress on the outside of the axle. Finally a new design method is proposed which is based on the shear stress, that is recalculated into an equivalent stress.

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    FULLTEXT01
  • 182.
    Claesson, Martin
    et al.
    Linköping University, Department of Mechanical Engineering.
    Forsgren, Johanna
    Linköping University, Department of Mechanical Engineering.
    Samband mellan hårdhetstal och materialparametrar för polymermaterial2005Independent thesis Basic level (professional degree)Student thesis
    Abstract [sv]

    Vid användande av polymerer och elastomerer i konstruktioner, lämnar leverantörer oftast endast materialparametrar i form av ett hårdhetstal. De vanligaste provningsmetoderna för hårdhetsmätning av polymerer och elastomerer är Shore samt IRHD (International Rubber Hardness Degree). Hårdhetstalen som erhålls är svåra att använda i Finita Elementanalyser, då de ej direkt kan översättas till mer lätthanterliga storheter.

    Syftet med examensarbetet är att utveckla en metod för att omvandla hårdhetstal till användbara Finita Elementstorheter.

    Det finns flera olika metoder för hårdhetsmätning inom Shore och IRHD.Arbetet begränsades dock till att enbart täcka en metod för Shore samt två metoder för IRHD.

    Arbetet inleddes med litteraturstudier följt av modellering samt simulering av hårdhetsprovningarna. Optimeringar har genomförts för att erhålla materialparameterns värden för olika hårdheter. Med hjälp av dessa värden har sedan samband mellan hårdhet och materialparametrar tagits fram.

    Erhållna slutsatser är att det med metodens hjälp går att finna samband mellan hårdhet och materialparametrar. Dessa parametrar kan anta olika värden för samma hårdhet. Om hårdhetsprovning kompletteras med andra provningsresultat blir resultaten mer entydiga.

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    FULLTEXT01
  • 183.
    Comstock, Mica
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Mass customization: perspectives, applications and implications for a 'New Manufacturing Paradigm'2001Licentiate thesis, monograph (Other academic)
  • 184.
    Comstock, Mica
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Production systems for mass customization: bridging theory and practice2004Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Today's siruation of rapid technological change and globalization is forcing businesses throughout the world to dramatically rethink their approaches for commercial success. At the same time, customer demands for quickly delivered product variety at a reasonable price - even down to a lot size of one - is fast becoming the rule rather than exception in a number of markets and industries.

    In the literature, a number of popular manufacturing systems and their associated enablers are positioned as solutions for meeting the demands of this opportunistic yet challenging scenario of customized production. The literature has also showcased a number of ''best business practice" cases in the area of efficient yet flexible customercentric production - a combination often referred to as "mass customization" - but these empirical descriptions are relacively few and often lacking in detail. Despite the positioning of mass customization as the next great manufacturing paradigm to succeed mass production, and the abundance of theory concerning its characteriscics and virtues, the challenge of widespread mass customization realizacion remains. In practice, mass customization initiatives are often misguided, ad-hoc and/ or reaccive in nature, with many ending in failure.

    While possible explanacions for these failures are many, a lack of capability may not be the culprit. In fact, there have been numerous technological and methodological advances in recent years that could facilitate the realization of mass customizacion. Rather, the difficulty may lie in effectively utilizing and combining these many enablers in successful systems for customized produccion. Not surprisingly, there appears to be a void of relevant frameworks that might aid manufacturers in capitalizing on the application of these numerous, already available enablers for mass customizacion, a view supported by this research's review of mass customization-related frameworks in the literature. Given this siruacion, it is little wonder that the gap between the theory of mass customization and its successful praccice in industry remains a wide one.

    With the objective of bridging this gap, this research reflects on mass customization theory and best business practice descriptions while adding empirical data to the field through a number of case studies in Swedish industry. In the investigation of these cases, various theoretical tools from the literature are utilized for the purposes of data collection, analysis and presentation, and to illustrate any links between theory and practice. Observations from the case studies, along with various perspectives and reflections from the literature, are considered in the presentation of guiding principles behind, and requirements for, a new framework for the analysis and/ or design of a production system for mass customizacion. Previous work in this research can be seen as culminating not only in the discovery of the need for such a framework, but also as a primary source of empirical and theoretical informacion from which to draw in its initial development.

    List of papers
    1. Hyper-flexibility: a concept for a new dimension in system variability
    Open this publication in new window or tab >>Hyper-flexibility: a concept for a new dimension in system variability
    2000 (English)In: CIRP - Journal of Manufacturing Systems, Vol. 31, p. 425-Article in journal (Other academic) Published
    Abstract [en]

    In this paper, a common for the evolving, multi-dimensional concept called 'hyper-dimensional' is proposed. The purpose of the paper is foremost to generate a discussion concerning advanced flexibility to meet today's advanced challenges, but also to present a working proposal for a common definition to the manufacturing community. In the paper, current manufacturing flexibility theory is reviewed, the origins and current usage of hyper-flexibility ate presented, and a common definition addressing several manufacturing flexibility dimensions is developed. The relation of the new concept to the manufacturing strategy of mass customization is also highlighted.

    Keywords
    flexibility, automatic, assembly
    National Category
    Medical and Health Sciences
    Identifiers
    urn:nbn:se:liu:diva-35219 (URN)25785 (Local ID)25785 (Archive number)25785 (OAI)
    Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-01-24
    2. Enabling mass customization in the mobile telephone industry: agility, flexibility and the changing role of assembly at Erisson
    Open this publication in new window or tab >>Enabling mass customization in the mobile telephone industry: agility, flexibility and the changing role of assembly at Erisson
    2001 (English)In: Proceedings of the 34th CIRP International Seminar on Manufacturing Systems, Athens, Greece: CIRP , 2001, p. 195-204Conference paper, Published paper (Refereed)
    Abstract [en]

    This paper reports results of an investigation conducted to explore the status of Mass Customization in the mobile telephone industry and its implications for assembly operations. The study focused on the manufacture of two representative mobile telephone models at Sweden's Ericsson. The findings include the level of variety and customization in each model, where in the value chain this differentiation was implemented, and how it was conceptually, methodologically and technologically enabled. The analysis, aided by several frameworks from the literature, points to a changing role for assembly in this industry, and suggests research direction to meet future customized manufacturing challenges.

    Place, publisher, year, edition, pages
    Athens, Greece: CIRP, 2001
    Keywords
    Agile Manufacturing, Flexibility, Assembly
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-35551 (URN)27530 (Local ID)27530 (Archive number)27530 (OAI)
    Conference
    34th CIRP International Seminar on Manufacturing Systems, Athens, Greece 16-18th May 2001
    Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2018-03-26
    3. Towards the mass customization of mobile telephones: current strategy and scenarios for realization at Ericsson
    Open this publication in new window or tab >>Towards the mass customization of mobile telephones: current strategy and scenarios for realization at Ericsson
    2001 (English)In: Proceedings of the 16th International Conference on Production Research, 2001Conference paper, Published paper (Refereed)
    Abstract [en]

    The paradigm of Mass Production is being challenged in a number of industries where fragmented markets and the customer's desire for individualized products have become the norm. In the largest consumer electronics industry in the world, that of mobile telephones, manufacturers are well aware of these trends. Many of these same manufacturers are responding with Mass Customization, which has been defined as customized production at Mass Production efficiency and speed. This research, conducted at Ericsson Mobile Communications AB in Sweden, explores the implications of implementing a Mass Customization strategy for the production of mobile telephones. The paper begins with an objective presentation of Mass Customization, which lays the foundation for a discussion of the strategy's applicability at Ericsson and in the mobile telephone industry as a whole. The study focused on the past, present, and projected roles of customized production at the company, and investigated its potential for Mass Customization in the future. Two frameworks from the customized manufacturing literature guided the data collection and analysis in the case. Findings from the study point towards minimal, yet increasing customization at Ericsson, and highlight recent efforts towards the realization of increasingly customer-focused production there. The applicability of different Mass Customization scenarios for Ericsson and its industry is also discussed.

    Keywords
    manufacturing strategy, mass customization, mobile communications industry
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-14109 (URN)
    Conference
    The 16th International Conference on Production Research, 29 July - 3 August, Prague, Czech Republic
    Available from: 2006-11-01 Created: 2006-11-01 Last updated: 2016-09-26
    4. From mass production to mass customization: enabling perspectives from the Swedish mobile telephone industry
    Open this publication in new window or tab >>From mass production to mass customization: enabling perspectives from the Swedish mobile telephone industry
    2004 (English)In: Production planning & control (Print), ISSN 0953-7287, E-ISSN 1366-5871, Vol. 15, no 4, p. 362-372Article in journal (Refereed) Published
    Abstract [en]

    Much has been written about the conceptual nature of mass customization, and the success of several best business practitioners in the area have been well documented. Most companies, however, are not textbook examples of best practice, but rather are making incremental progress towards mass customization based on a mass-production heritage. This paper presents the findings of a case study that investigated a mass customization initiative at a leading mobile telephone manufacturer in Sweden. The primary objective of the study was to determine the implications of a radically new manufacturing initiative for the company – the production of a customized, entry-level mobile telephone. The differences between the traditional scenario of the mass production of standardized products at the company and that of the new customized production were also sought. The findings of the study, which are presented using the product, process and system perspectives, are aided by a number of customization-related frameworks from the literature. The discussion includes the impact of moving the customization order point downstream in the value chain in terms of increased efficiency and reduced lead times, the reduced requirement for manufacturing flexibility with shifting production system boundaries, and the company's status as a mass customizer.

    Keywords
    mass customization, strategy, product design, process design, system design, case studies
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-14111 (URN)10.1080/0953728042000238836 (DOI)
    Available from: 2006-11-01 Created: 2006-11-01 Last updated: 2017-12-13
    5. Enabling mass customization through customer elicitation and concurrent engineering: reflections from a brest practice case in Swedish industry
    Open this publication in new window or tab >>Enabling mass customization through customer elicitation and concurrent engineering: reflections from a brest practice case in Swedish industry
    2003 (English)In: Proceedings of the 19th ISPE Internationa Conference on Concurrent Engineering: Reasearch and Application / [ed] J. Cha, R. Jardim-Goncalves, A. Steiger-Garcão, 2003, p. 1109-1118Conference paper, Published paper (Refereed)
    Abstract [en]

    Requirements and so-called enablers for the realization of mass customization have been increasingly discussed and categorized in the literature, in tact with the concept's phenomenal rise in popularity since the early 1990s. The requirement for effective customer elicitation, and corresponding technological enablers like product configuration applications, are two such high-profile examples. Another, albeit much less obvious requirement, is the use of concurrent engineering in support of mass customization. In this paper, a case from Swedish industry is described which illustrates one company's industry-leading approach to both customer elicitation and concurrent engineering, and also how the company combines the two to achieve competitive advantage as a mass customizer. The analysis also compares this best practice case, describing "how it is done", to theoretical foundations describing ''how it could be done" - with surprising results.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87848 (URN)
    Conference
    The 10th ISPE International Conference on Concurrent Engineering: Research and Applications, 26-30 July 2003, Madeira, Portugal
    Available from: 2013-01-24 Created: 2013-01-24 Last updated: 2013-01-24
    6. Coordination in collaborative manufacturing mega-networks: a case study
    Open this publication in new window or tab >>Coordination in collaborative manufacturing mega-networks: a case study
    2005 (English)In: Journal of engineering and technology management, ISSN 0923-4748, E-ISSN 1879-1719, Vol. 22, no 3, p. 226-244Article in journal (Refereed) Published
    Abstract [en]

    Collaborative manufacturing networks are becoming popular. Today, the scale of these networks can be enormous, and include a complex myriad of partners from numerous companies and organizations spanning several countries and even continents. This paper explores how these partners successfully coordinate projects through an investigation of one such “collaborative manufacturing mega-network” or CMMN in the commercial aerospace industry. The case is analyzed with the aid of the literary state-of-the-art, and a number of organizational, structural, and cultural issues are discussed including mass customization. Finally, some of the most important factors for the successful CMMN are presented.

    Keywords
    Collaborative manufacturing, Collaborative networks, Commercial aerospace industry, Mass customization
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-14115 (URN)10.1016/j.jengtecman.2005.06.005 (DOI)
    Available from: 2006-11-01 Created: 2006-11-01 Last updated: 2017-12-13
    7. Beyond 'Read a plant - fast' (for lean): read an enterprise for mass customization
    Open this publication in new window or tab >>Beyond 'Read a plant - fast' (for lean): read an enterprise for mass customization
    2003 (English)In: Proceedings of the 2nd Interdisciplinary World Congress on Mass Customization and Personalization, 2003Conference paper, Published paper (Refereed)
    Abstract [en]

    In this paper, a preliminary tool is presented for use in the analysis of the mass customization situation at an enterprise. The new tool is a modification and expansion of an existing lean manufacturing tool called the Rapid Plant Assessment (RPA). To do so, the relationship between lean manufacturing and mass customization is first discussed in terms of the similarities and differences between the two manufacturing strategies. Next, a review of existing tools for lean production and mass customization is made, with a focus on a popular RPA lean manufacturing tool, which is described in detail in “Read a Plant – Fast” (Goodson, 2002). Following this, the requirements for a modified and expanded tool are suggested, leading to the initial development of what the authors call “Read an Enterprise for Mass Customization” (REMC). The REMC is then applied to a number of cases in Swedish industry, and the results of this application are presented. The ensuing discussion includes the applicability of the tool in practice and the benefits of such a tool for industry. Finally, suggestions are made for the further development of the tool and its continued utilization in industrial settings.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87849 (URN)
    Conference
    The 2nd Interdisciplinary World Congress on Mass Customization and Personalization, 6-8 October, 2003, Munich, Germany
    Available from: 2013-01-24 Created: 2013-01-24 Last updated: 2013-01-24
  • 185.
    Comstock, Mica
    et al.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Bröte, Staffan
    Jönköping University, Jönköping, Sweden.
    Beyond 'Read a plant - fast' (for lean): read an enterprise for mass customization2003In: Proceedings of the 2nd Interdisciplinary World Congress on Mass Customization and Personalization, 2003Conference paper (Refereed)
    Abstract [en]

    In this paper, a preliminary tool is presented for use in the analysis of the mass customization situation at an enterprise. The new tool is a modification and expansion of an existing lean manufacturing tool called the Rapid Plant Assessment (RPA). To do so, the relationship between lean manufacturing and mass customization is first discussed in terms of the similarities and differences between the two manufacturing strategies. Next, a review of existing tools for lean production and mass customization is made, with a focus on a popular RPA lean manufacturing tool, which is described in detail in “Read a Plant – Fast” (Goodson, 2002). Following this, the requirements for a modified and expanded tool are suggested, leading to the initial development of what the authors call “Read an Enterprise for Mass Customization” (REMC). The REMC is then applied to a number of cases in Swedish industry, and the results of this application are presented. The ensuing discussion includes the applicability of the tool in practice and the benefits of such a tool for industry. Finally, suggestions are made for the further development of the tool and its continued utilization in industrial settings.

  • 186.
    Comstock, Mica
    et al.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Bröte, Staffan
    Jönköping University, Jönköping, Sweden.
    Enabling mass customization through customer elicitation and concurrent engineering: reflections from a brest practice case in Swedish industry2003In: Proceedings of the 19th ISPE Internationa Conference on Concurrent Engineering: Reasearch and Application / [ed] J. Cha, R. Jardim-Goncalves, A. Steiger-Garcão, 2003, p. 1109-1118Conference paper (Refereed)
    Abstract [en]

    Requirements and so-called enablers for the realization of mass customization have been increasingly discussed and categorized in the literature, in tact with the concept's phenomenal rise in popularity since the early 1990s. The requirement for effective customer elicitation, and corresponding technological enablers like product configuration applications, are two such high-profile examples. Another, albeit much less obvious requirement, is the use of concurrent engineering in support of mass customization. In this paper, a case from Swedish industry is described which illustrates one company's industry-leading approach to both customer elicitation and concurrent engineering, and also how the company combines the two to achieve competitive advantage as a mass customizer. The analysis also compares this best practice case, describing "how it is done", to theoretical foundations describing ''how it could be done" - with surprising results.

  • 187.
    Comstock, Mica
    et al.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Johansen, Kerstin
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Towards the mass customization of mobile telephones: current strategy and scenarios for realization at Ericsson2001In: Proceedings of the 16th International Conference on Production Research, 2001Conference paper (Refereed)
    Abstract [en]

    The paradigm of Mass Production is being challenged in a number of industries where fragmented markets and the customer's desire for individualized products have become the norm. In the largest consumer electronics industry in the world, that of mobile telephones, manufacturers are well aware of these trends. Many of these same manufacturers are responding with Mass Customization, which has been defined as customized production at Mass Production efficiency and speed. This research, conducted at Ericsson Mobile Communications AB in Sweden, explores the implications of implementing a Mass Customization strategy for the production of mobile telephones. The paper begins with an objective presentation of Mass Customization, which lays the foundation for a discussion of the strategy's applicability at Ericsson and in the mobile telephone industry as a whole. The study focused on the past, present, and projected roles of customized production at the company, and investigated its potential for Mass Customization in the future. Two frameworks from the customized manufacturing literature guided the data collection and analysis in the case. Findings from the study point towards minimal, yet increasing customization at Ericsson, and highlight recent efforts towards the realization of increasingly customer-focused production there. The applicability of different Mass Customization scenarios for Ericsson and its industry is also discussed.

  • 188.
    Comstock, Mica
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Assembly technology.
    Johansen, Kerstin
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Assembly technology .
    Kihlman, Henrik
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Assembly technology.
    Sundin, Erik
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Assembly technology .
    Winroth, Mats
    Jönköpings tekniska högskola.
    Project Course within Assembly-NET2002Report (Other academic)
  • 189.
    Comstock, Mica
    et al.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Johansen, Kerstin
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Winroth, Mats
    Department of Industrial Engineering, School of Engineering, Jönköping University, Jönköping, Sweden.
    From mass production to mass customization: enabling perspectives from the Swedish mobile telephone industry2004In: Production planning & control (Print), ISSN 0953-7287, E-ISSN 1366-5871, Vol. 15, no 4, p. 362-372Article in journal (Refereed)
    Abstract [en]

    Much has been written about the conceptual nature of mass customization, and the success of several best business practitioners in the area have been well documented. Most companies, however, are not textbook examples of best practice, but rather are making incremental progress towards mass customization based on a mass-production heritage. This paper presents the findings of a case study that investigated a mass customization initiative at a leading mobile telephone manufacturer in Sweden. The primary objective of the study was to determine the implications of a radically new manufacturing initiative for the company – the production of a customized, entry-level mobile telephone. The differences between the traditional scenario of the mass production of standardized products at the company and that of the new customized production were also sought. The findings of the study, which are presented using the product, process and system perspectives, are aided by a number of customization-related frameworks from the literature. The discussion includes the impact of moving the customization order point downstream in the value chain in terms of increased efficiency and reduced lead times, the reduced requirement for manufacturing flexibility with shifting production system boundaries, and the company's status as a mass customizer.

  • 190.
    Comstock, Mica
    et al.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Ossbahr, Gilbert
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Hyper-flexibility: a concept for a new dimension in system variability2000In: CIRP - Journal of Manufacturing Systems, Vol. 31, p. 425-Article in journal (Other academic)
    Abstract [en]

    In this paper, a common for the evolving, multi-dimensional concept called 'hyper-dimensional' is proposed. The purpose of the paper is foremost to generate a discussion concerning advanced flexibility to meet today's advanced challenges, but also to present a working proposal for a common definition to the manufacturing community. In the paper, current manufacturing flexibility theory is reviewed, the origins and current usage of hyper-flexibility ate presented, and a common definition addressing several manufacturing flexibility dimensions is developed. The relation of the new concept to the manufacturing strategy of mass customization is also highlighted.

  • 191.
    Comstock, Mica
    et al.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Winroth, Mats
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Enabling mass customization in the mobile telephone industry: agility, flexibility and the changing role of assembly at Erisson2001In: Proceedings of the 34th CIRP International Seminar on Manufacturing Systems, Athens, Greece: CIRP , 2001, p. 195-204Conference paper (Refereed)
    Abstract [en]

    This paper reports results of an investigation conducted to explore the status of Mass Customization in the mobile telephone industry and its implications for assembly operations. The study focused on the manufacture of two representative mobile telephone models at Sweden's Ericsson. The findings include the level of variety and customization in each model, where in the value chain this differentiation was implemented, and how it was conceptually, methodologically and technologically enabled. The analysis, aided by several frameworks from the literature, points to a changing role for assembly in this industry, and suggests research direction to meet future customized manufacturing challenges.

  • 192. Order onlineBuy this publication >>
    Cronemyr, Peter
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Towards a learning organization for product development2000Licentiate thesis, monograph (Other academic)
    Abstract [en]

    The costs of late changes due to earlier misunderstandings in product development are very high, even though no company wants to admit how high they really are. From experience in Swedish industry and based on results from previous research found in the literature, the conclusion is drawn that people need to talk to one another to be able to understand one another and thereby avoid misunderstandings. Information technology can be used to increase the frequency and amount of information communicated within a product development organization but it cannot replace talking. This project aims at delivering methods that are intended to improve effectiveness of product development, i.e. fewer misunderstandings will contribute to improved quality and, as a consequence, lowered costs and shortened lead-times. The project also aims at delivering a method that is intended to improve organizational learning, which would in turn improve a company’s ability to adapt more easily to a changing environment. The ultimate goal and vision is more competitive companies.

    The following contributions to the theory of Engineering Management are presented in this thesis: (i) ‘An Engineering Management Model for Improvement of Organizational Learning’ is a theoretical model of how three management disciplines can be used together to improve organizational learning within a product development organization, based on the framework of Senge’s five disciplines. (ii) ‘Phantom Turbine Development’ is a presentation of how people engaged in development of technology and processes for product development can share goals and visions based on future customer needs. (iii) ‘Process Improvement Simulations’ are a method for simulating and comparing improvements to the development process before they actually take place. (iv) ‘Knowledge Overlapping Seminars (KOS)’ are a communication method for engineers in a product development team with the purpose of eliminating misunderstandings. Obstacles that occur in ‘ordinary meetings’ are avoided in a KOS.

    Action research has been used as research method. It has been performed at ABB STAL, a company developing gas and steam turbines, where the researcher of this project is employed. The approach used, collaborative action inquiry, is characterized by the researcher having an almost total identification with the activities and direction of change of the company, which is the case since the research is to a great extent based on the researcher’s own experience.

    Download full text (pdf)
    Towards a learning organization for product development
  • 193.
    Dag, Süleyman
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology. Univ.,.
    Volvo faces a deregulated European electricity market2000Doctoral thesis, monograph (Other academic)
    Abstract [en]

    A deregulated European electricity market, would in the long run, mean uniform prices for similar customers. Hence, companies in Sweden must be as competitive as other industries in continental Europe in their electricity use.

    Studies of two comparable car plants within the Volvo Corporation, the Gent plant in Belgium and the Torslanda plant in Sweden, show that the electric energy usage per car produced is twice as high in Torslanda. The main reason is different price levels. The price in Torslanda is 50% lower, which means that the electricity costs are about the same for both plants. Explanations other than the price have been examined and rejected.

    The electricity monitoring and controlling system in Gent is more sophisticated and enables a more efficient electricity use. A load management program for the electricity demand at the Gent plant is active throughout the year. No such program exists in Torslanda. Electric resistant heating is quite common in Torslanda, while it does not exist in Gent. Almost all installation processes use more electricity in Torslanda. The electricity use during non-working hours is significantly higher in Torslanda compared with Gent. The study shows that there is a greater awareness of electricity costs in Gent.

    Based on the experiences from Volvo and presented measures, a method has been developed to be used as a guide when searching for system imperfections within Swedish industrial energy systems facing a deregulated European electricity market. Computerized optimization models of the energy systems have been developed to study the cost-effectiveness of identified efficiency measures.

    The transition of the Torslanda plant to a more efficient state has already started. The concepts and results of the study were adapted at an early stage and the paint shop in Torslanda was chosen for implementing the recent gains in new knowledge. Also, in order to spread and implement the results from the present study to all plants in Sweden, a group named 'El50' has been established within the Volvo Corporation. The objective is to decrease the electricity usage by 50% or to thesame level as in continental plants.

  • 194.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Dynamic train/track interaction model2004Report (Other academic)
  • 195.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Kontinuerligt understödd räl2004Patent (Other (popular science, discussion, etc.))
  • 196.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Modelling of railroad track settlements2001In: TransportForum,2001, 2001Conference paper (Other academic)
    Abstract [en]

          

  • 197.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Moving force on an axially loaded beam - With applications to a railway overhead contact wire2006In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 44, no 8, p. 631-644Article in journal (Refereed)
    Abstract [en]

    Using modal analysis, the deflection of a beam subjected to an axial tensile force N and a moving vertical force P , has been determined. This solution was exploited in a study of deflection and wave propagation in the contact wire of a railway overhead catenary system. For moderate values of speed c of the moving force P ( i.e ., c less than half the lowest critical speed c crit ) travelling waves reflect at the boundaries of the contact wire so that the waves meet and catch up with the moving force several times. In practice, when a pantograph (here modelled by the force P ) touches the contact wire some distance from the end of the wire, waves are sent out both in the forward and backward direction, giving even more reflections and wave interactions with the contact force. These waves will add or subtract to the wire deflection at the point of force application. The stress in the wire due to bending is estimated and it appears to be moderate for the speeds investigated here ( i.e ., for c < 0.5ccrit). Close to the critical speed, however, bending stresses will be significant.

  • 198.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Procedure to calculate deflections of curved beams2004In: International journal of engineering education, ISSN 0949-149X, Vol. 20, p. 503-513Article in journal (Refereed)
  • 199.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Rewiew of research on railroad ballast as track substructure2000In: TransportForum,1999, 2000Conference paper (Other academic)
  • 200.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    The Effect of Modal Coupling in Random Vibration Analysis1999In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, p. 157-176Article in journal (Other academic)
1234567 151 - 200 of 1192
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