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  • 201.
    Schentz, Kristian
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Förstudie för automatisering av manuell lödning2010Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This degree project has been carried out in cooperation with Enertech AB in Ljungby and is pilot study to automating all current manual soldering. The soldering process accounts for a large part of the processing cost in the production of a heat pump. The process is also a quality risk and has a major impact on the lifetime of the final product.

    The Main task of this project has been to evaluate automation of the soldering process, to develop automation solutions and a principle layout, to draw the design changes required for the automation and to calculate the supposed solution.

    This pilot study has resulted in a suggested automation solution using laser as a heat source for soldering. Calculations of the solution show that a automating a laser soldering cell is very profitable.

  • 202.
    Sevandersson, Rickard
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Skoog, Joonatan
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Xtend Arm: Utveckling av en armbågsledskomponent inom protetik2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 203.
    Singaravelu, Praveen Kumar
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Fotonik.
    Mohammad, Tawhidul Alam
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Fotonik.
    Electrical and Optical Characterization of InAsP/InP Nanowire-Based Avalanche Photodetectors2016Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesis
    Abstract [en]

    The availability of new manufacturing methodology in solid state physics makes it possible to grow nano-photonic devices for better performance and unique properties. In this thesis work, we use I-V and FTIR spectroscopy to study the electrical and optical properties of InAsP/InP nanowire-based array avalanche photodetectors for near infrared applications. Measurements are performed at 300K and 5K for different applied biases under darkness and illumination conditions. I-V curves are plotted to understand the charge carrier transport in nanowire photodetectors and also to improve the device fabrication. I-V characteristics display non-optimal diode properties with large dark leakage currents. From spectrally resolved photocurrent measurements, peaks appear at photon energies of 1.34eV and 1.4eV respectively, corresponding to the bandgap of zinc blende (ZB) and wurtzite (WZ) InP. An additional photocurrent peak at 1.25eV agrees with the bandgap of the included InAsP segments. The Schottky-like contacts present at the top of the nanowires most likely generate additional photocurrent at higher photon energies. No breakdown effect is observed for the array devices. Complementary single-nanowire devices indicate an avalanche breakdown effect at  VR=-35V.

  • 204.
    Sjöström, Oscar
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Bernfort, Björn
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Mechanical Design of a Gaming Robot2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • 205.
    Speich, M.
    et al.
    University Aalen, Aalen, Germany.
    Bååth, Lars
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Fotonik.
    Boerret, R.
    University Aalen, Aalen, Germany.
    Harrison, D.K.
    Glasgow Caledonian University, Glasgow, United Kingdom.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Robot assisted steel polishing and surface characterisation2012In: Proceedings of the 12th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2012 / [ed] Spaan H., Burke T. & Shore P., Cranfield, Bedfordshire: euspen , 2012, Vol. 2, p. 205-208Conference paper (Refereed)
    Abstract [en]

    Polymer optics is a growing market both for medium quality optics and precision optics. Steel moulds for polymer optics are normally produced in several process steps; the last step before moulding is manual polishing. This step requires skilled experts and is very time-consuming. The focus of this paper is on robot polishing of steel moulds for polymer injection moulding of optics. The goal of this work is to replace manual polishing and other process steps with robot polishing. Therefore a new process has been developed to minimize the number of required process steps.

    Steel moulds for polymer optics demand high standards of roughness and shape accuracy. To reach the required specifications concerning roughness and shape accuracy different measurement and characterization methods are necessary. A combination of parameters determined with different measurement instruments is needed to validate the polishing results.

    This project was started by Aalen University and UVEX Safety Group together with the Experimental Ophthalmology Group Homburg/Saar. The goal for this new process is to produce a ready to use steel mould with a shape accuracy better than 4µm and a micro roughness of less than 5nm rms; with just one process step after grinding.

  • 206.
    Su, Bu-Mei
    et al.
    Yunnan Observatory, Chinese Academy of Sciences, Kumming 650011.
    Li, Yong-Sheng
    Yunnan Observatory, Chinese Academy of Sciences, Kumming 650011.
    Bååth, Lars B.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Gao, Yi-Fei
    Yunnan Observatory, Chinese Academy of Sciences, Kumming 650011.
    Sub-milliarcsecond radio structure of three quasars2000In: Acta Astrophysica Sinica, ISSN 0253-2379, Vol. 20, no 4, p. 349-354Article in journal (Refereed)
    Abstract [zh]

    The quasars, 0420-014, 0748+126 and 2251+158 (3C 454.3), have been observed at 1.3 cm with a global VLBI network. We have obtained the hybrid maps of the quasars at sub-milliarcsecond resolution. The brightness distribution is revealed in their nuclear regions. The observed data are fitted with a small number of Gaussian components. 2251+158 shows a core-jet structure, and its nuclear region is elongated in the direction PA= -130o. The jet is curved. Its observations at the epoch 1992.9 show it to be in the course of a large burst, accompanied by several smaller ones. The strongest component has a flux of ~ 4.11 Jy (67% of the total detected flux), mostly from an area of 0.16 x 0.01 mas. Doppler boosting is probably responsible for raising the brightness temperature up to 2.6 x 1012 K.

  • 207.
    Su, Bu-Mei
    et al.
    Yunnan Observatory, Chinese Academy of Sciences, 650011, Kunming, China.
    Li, Yong-Sheng
    Yunnan Observatory, Chinese Academy of Sciences, 650011, Kunming, China.
    Bååth, Lars B.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Gao, Yi-Fei
    Yunnan Observatory, Chinese Academy of Sciences, 650011, Kunming, China.
    Sub-milliarcsecond radio structure of three quasars2001In: Chinese Astronomy and Astrophysics, ISSN 0275-1062, E-ISSN 1879-128X, Vol. 25, no 1, p. 23-28Article in journal (Refereed)
    Abstract [en]

    The quasars, 0420-014, 0748+126 and 2251+158 (3C 454.3), have been observed at 1.3 cm with a global VLBI network. We have obtained the hybrid maps of the quasars at sub-milliarcsecond resolution. The brightness distribution is revealed in their nuclear regions. The observed data are fitted with a small number of Gaussian components. 2251+158 shows a core-jet structure, and its nuclear region is elongated in the direction PA= -130o. The jet is curved. Its observations at the epoch 1992.9 show it to be in the course of a large burst, accompanied by several smaller ones. The strongest component has a flux of ~ 4.11 Jy (67% of the total detected flux), mostly from an area of 0.16 x 0.01 mas. Doppler boosting is probably responsible for raising the brightness temperature up to 2.6 x 1012 K.

  • 208.
    Sunnerheim, Jon
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Jonsson, Robin
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Maskin för rensning av gummidetaljer2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis describes the development of a design construction. The thesis has been done incollaboration with Halmstad Gummifabrik. Cleansing of one of their products is donemanually. This is a slow and costly process which also contribute to poor ergonomics. HGFwish for a mechanical solution to make this process more ergonomic and to make the productmore profitable.The project provides background information, studies, criteria, proposal sketches, modelproposals, component, criteria’s, CAD modeling and much more besides. The methodologyused as the basis of the project is Fredy Olsson principle and primary structure. A lot ofrelevant theory is given in the report and in conclusion the authors discuss and drawconclusions about the project.

  • 209.
    Svedbergh, Susanna
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Munch, Maria
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    FÖRBÄTTRAD MONTERING OCH DESIGNAV BAGAGELUCKA2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis includes a mechanical engineering design work performed incollaboration between ÅF and Halmstad University. The work is done by FredyOlsson’s methods of Principle- and Primary Construction and David Ullman’stheories of Design for Assembly.The group was commissioned by ÅF to produce a concept to narrow down theassembly time of today’s luggage doors by reducing the numbers of adjustmentoptions. They also wanted it to be easier to mount the assembly by making itpossible to adjust the door in a closed position. Today luggage door takes, with its10 adjustment possibilities, around 4 hours each to assemble and ÅF wanted anassembly time around 10 minutes per door.Initially a preliminary study was made where the group began reviewing today'sconstruction and mounting of rails and doors on buses. The current flow of thetailgate opening is still preferable. A further aspect the group included was thatthe assembly would also be more ergonomic for the assembler.Three concepts were developed based on the set criteria. The concept of aframework that aligns with the luggage opening was the best option. To developthe best construction of the framework and associated components, the group usedevaluation templates and FEM analysis to conclude that the construction wasreasonably rigid.The result of the project was to attach a frame holder against today's constructionof rails. A frame is attached on to the frame holders and then a click door isplaced. The frame holders have three hooks that attaches into the framework.After adjustment towards the boot lid opening the click door is attached on theoutside of the frame. The frame can now be adjusted in a closed position. Thissolution results that the number of adjustment options remains as before but itmakes mounting flow more easily. The ergonomic work for the installer is easieras well as installation time is greatly reduced.

  • 210.
    Svedlund, Jon
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Torstensson, Daniel
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Översvämningsskydd: Produkt som förhindrar översvämning i duschen2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 211.
    Thomas, T. R.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Kenneth J. Stout 1941-2006: a memorial2009In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 266, no 5-6, p. 490-497Article in journal (Refereed)
    Abstract [en]

    Kenneth J. Stout was an important figure in the development of surface metrology, and in particular of roughness measurement and characterisation, during the last decades of the twentieth century. He made substantial contributions to the statistical characterisation of rough surfaces and the application of this work to tribological measurements. Later he was instrumental in developing and popularising practical techniques for three-dimensional description of surface roughness, including the well known "Birmingham 14" set of roughness parameters. Finally he was one of the first to promote the application of wavelet transforms to surface metrology. This memorial discusses his personal contribution to the subject and attempts to set it in the context of historical developments in the field. It includes what is hoped to be a definitive bibliography of his journal publications and those of his co-workers.

  • 212.
    Thomas, T. R.
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Zahouani, Hassan
    Laboratoire de Tribologie et Dynamique des Systèmes, ENIS, St. Etienne, France.
    Blunt, Liam
    Huddesfield University, UK.
    El Mansori, M.
    Laboratoire de Mécanique et de Procédés de Fabrication, Arts et Métiers ParisTech, Châlons en Champagne, France.
    Traceology, quantifying finishing machining and function: A tool and wear mark characterisation study2009In: Proceedings of the 12th International Conference on Metrology and Properties of Engineering Surfaces / [ed] P. Pawlus, L. Blunt, B.-G. Rosén, T. Thomas, M. Wieczorowski, H. Zahouani, Rzeszow, Poland: Rzeszow University of Technology , 2009, p. 209-215Conference paper (Refereed)
    Abstract [en]

    Traceology is defined as the study of wearmarks and its history in criminology and archaeology is briefly described. It is proposed that the concept of traceology can be extended to machined surfaces, particularly those produced by abrasive techniques. A taxonomy of wearmarks is outlined which would encompass both pits and scratches. Taxonomic implementations such as the morphology rose and the morphological tree are introduced. The general principles of traceology are illustrated by case studies from criminology, archaeology and abrasive machining processes.

  • 213.
    Thomas, Tom
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Engineering applications of surface topography2013In: International Journal of Precision Technology, ISSN 1755-2079, Vol. 3, no 4, p. 333-353Article in journal (Refereed)
    Abstract [en]

    A taxonomy of applications is developed using the concept of function maps. The importance of roughness in contact mechanics is emphasised and alternative models of the plasticity index are revisited. The concept of contact resistance is shown to be strongly dependent on roughness. Further discussions are illustrated by a selection of case studies. Case studies from the life sciences include a discussion of dental and femoral prosthetics and architectural haptics. Tribological case studies are based on automotive problems, including manufacture of body parts, cylinder bore friction and lubrication, rocker cam wear and gear lubrication. It is concluded that the future of roughness studies lies with applications; that only a small number of currently available roughness parameters appear to have any practical use; and that much current work may eventually made obsolete by the increasing development of structured surfaces.

  • 214.
    Thomas, Tom
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Fractal Analysis of Hip Prosthesis Roughness and Wear2009Conference paper (Refereed)
  • 215.
    Thomas, Tom
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Roughness and function2013In: Metrology and Properties of Engineering Surfaces, 2013: Proceedings of the 14th International Conference, Taipei, Taiwan, June 17-21, 2013, Taipei, Taiwan, 2013Conference paper (Refereed)
    Abstract [en]

    A function map is used to locate applications of roughness in separation-velocity space. The importance of roughness in contact mechanics is demonstrated and versions of the plasticity index are introduced and compared. Case studies of roughness and function are presented from tribology and the life sciences. Tribological examples are taken from the automotive industry and include the manufacture of vehicle bodies, and drive train tribology, particularly cylinder liner, cam and gearbox friction and wear. From the life sciences, problems of prosthetic fixation and tribology are shown to depend on roughness. The interaction of haptics and surface finish is described and illustrated. A number of other areas of application are listed. Finally the likely future importance of structured surfaces is discussed.

  • 216.
    Thomas, Tom
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Roughness and function2014In: Surface Topography: Metrology and Properties, ISSN 2051-672X, Vol. 2, no 1, article id 014001Article in journal (Refereed)
    Abstract [en]

    A function map is used to locate applications of roughness in separation-velocity space. The importance of roughness in contact mechanics is demonstrated and versions of the plasticity index are introduced and compared. Case studies of roughness and function are presented from tribology and the life sciences. Tribological examples are taken from the automotive industry and include the manufacture of vehicle bodies, and drive train tribology, particularly cylinder liner, cam and gearbox friction and wear. From the life sciences, problems of prosthetic fixation and tribology are shown to depend on roughness. The interaction of haptics and surface finish is described and illustrated. A number of other areas of application are listed. Finally the likely future importance of structured surfaces is discussed. © 2014 IOP Publishing Ltd.

  • 217.
    Thomas, Tom
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Using stylus Instruments to Solve Engineering Roughness Problems2009Conference paper (Refereed)
    Abstract [en]

    Performance of roughness measuring instruments is best compared by using Stedman diagrams. These make clear why the majority of roughness measurements for inspection and quality control in engineering industry are still made with stylus instruments. The design and construction of these instruments is described and compared with their predecessors, and their advantages, limitations and sources of error are discussed. The use of computers with modern stylus instruments raises problems of signal conditioning such as analogue-to-digital conversion and form and waviness removal. The former requires control of quantisation and aliasing, while the latter needs the design and implementation of specialised filters such as the robust Gaussian and valley removal filters. Characterisation of profile measurements includes both amplitude and texture parameters; functions such as probability distributions, autocorrelation functions and power spectra are also sometimes used, but their drawbacks need to be realised.  Special amplitude parameters have been developed to describe the multiprocess surfaces now in common use. Roughness parameter specification in standards raises questions of sampling robustness. Applications are illustrated by case histories from fluid dynamics, heat transfer and automotive engineering.

  • 218.
    Thomas, Tom R.
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Rosén, Bengt - Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Zahouani, Hassan
    Laboratoire de Tribologie et Dynamique des Systèmes, ENIS, St. Etienne, France.
    Blunt, Liam
    Centre for Precision Technologies, Huddersfield University, Huddersfield, UK.
    El Mansori, Mohamed
    Laboratoire de Mécanique et de Procédés de Fabrication, Arts et Métiers ParisTech, Châlons en Champagne, France.
    Traceology, quantifying finishing machining and function: A tool and wear mark characterisation study2011In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 271, no 3-4, p. 553-558Article in journal (Refereed)
    Abstract [en]

    Traceology is defined as the study of wear marks and its history in criminology and archaeology is briefly described. It is proposed that the concept of traceology can be extended to machined surfaces, particularly those produced by abrasive techniques. A taxonomy of wear marks is outlined which would encompass both pits and scratches. Taxonomic implementations such as the morphology rose and the morphological tree are introduced. The general principles of traceology are illustrated by case studies from criminology, archaeology and abrasive machining processes.

  • 219.
    Thomas, Tom
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Implementation of Whitehouse's method for calculating properties of self-affine fractal profiles2008In: Proceedings of the Institution of mechanical engineers. Part C, journal of mechanical engineering science, ISSN 0954-4062, E-ISSN 2041-2983, Vol. 222, no 8, p. 1547-1550Article in journal (Refereed)
    Abstract [en]

    Many software packages for roughness analysis offer the possibility of calculating the fractal dimension D of surface profiles by techniques, which assume them to be self-similar and therefore uniquely defined by D. However, fractal profiles are not self-similar but self-affine, so that two profiles of quite different roughnesses may share the same fractal dimension. To distinguish between them requires the calculation of an additional scaling factor, the so-called topothesy Λ. Traditionally, D and Λ are derived laboriously from the slope and intercept of the profile's structure function. A quicker and more convenient derivation from standard roughness parameters has been suggested by Whitehouse. Based on this derivation, it is here shown that D and Λ depend on two dimensionless numbers: the ratio of the mean peak spacing to the rms roughness and the ratio of the mean local peak spacing to the sampling interval. Using this approach, values of D and Λ are calculated from the measurements on surface profiles produced by polishing, plateau honing, and various single-point machining processes. Different processes are shown to occupy different regions in D-Λ space, and polisbed surfaces show a relationship between D and Λ, which is independent of the surface material. © IMechE 2008.

  • 220.
    Thomas, T.R.
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Rosén, Bengt Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Surfaces generated by abrasive finishing processes as self-affine fractals2009In: International Journal of Surface Science and Engineering, ISSN 1749-785X, Vol. 3, no 4, p. 275-285Article in journal (Other academic)
    Abstract [en]

    Self-affine fractals offer a tool for characterising surface roughness. Fractal parameters are scale-invariant and can be derived from the Structure Function (SF): if computation of the SF is not practicable then parameters can be derived from roughness parameters available on many commercial software packages. The three-dimensional SF gives information about anisotropy. SFs can offer a demonstration of the effect of wear on surface topography in tribological investigations. Finally the SF can be used with material properties to obtain a low-pass cutoff for the calculation of surface data for use in rough contact mechanics.

  • 221.
    Ullman, Viktor
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Stångmagasin till industrirobot2016Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
  • 222.
    Vedantha Krishna, Amogh
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Reddy, Vijeth Venkataram
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    LEAD FREE BRASS: Study and Analysis of the surface integrity of lead brass and unleaded brass.2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The addition of lead to the copper alloys increases its machinability and reducesthe overall production cost, despite copper being expensive, which makes achallenging task to replace lead. But the alarming effects of lead on human healthand the recycling problems has led to the increase in concern forreducing/eliminating the use of lead in brass and other copper alloys. Manymaterials are considered to replace lead in brass; silicon is one such alternative.The turned brass sample are investigated using the state of the artequipments at Halmstad University. The results obtained are controlled readingsof surface parameters and is categorized using surface imaging and mappingsoftware, Mountains Map.This thesis characterizes the lead and the lead free brass's surfaceintegrity for a certain cutting data. The study deals with the evaluation ofselection of appropriate surface integrity parameters and summarizes theappropriate combination of cutting data to maintain the surface of the ecobrass/unleaded brass on par with the leaded brass surface. The 2D and 3Dsurface parameters illustrates the surface functionality and its effect on thematerial in contact.The research results suggest a detailed methodology for the analysis ofsurface topography and a comparison exemplifying differences between the twomaterials under study. The research provides a perplexed results and forms thebasis for further investigations of the samples machined at different cutting data.Second set of test includes comparing the Leaded brass with the unleaded brasssamples machined at 0.06, 0.1, 0.15 and 0.2mm/rev respectively. The studyfocuses on the correlation of cutting feed and the surface parameters. Comparingthe results of two tests, the unleaded brass machined @ feed rate 0.2mm/rev,200m/min, 1.5mm depth of cut posses similar surface functionality as leadedbrass.

  • 223.
    Wang, Hongjun
    et al.
    Beijing Information Science & Technology University, Beijing, China.
    Xu, Xiaoli
    Beijing Information Science & Technology University, Beijing, China.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Fault diagnosis model based on multi-manifold learning and PSO-SVM for machinery2014In: Chinese Journal of Scientific Instrument, ISSN 0254-3087, Vol. 35, no 12, p. 210-214, article id 210Article in journal (Refereed)
    Abstract [en]

    Fault diagnosis technology plays an important role in the industries due to the emergency fault of a machine could bring the heavy lost for the people and the company. A fault diagnosis model based on multi-manifold learning and particle swarm optimization support vector machine(PSO-SVM) is studied. This fault diagnosis model is used for a rolling bearing experimental of three kinds faults. The results are verified that this model based on multi-manifold learning and PSO-SVM is good at the fault sensitive features acquisition with effective accuracy.

  • 224.
    Warolin, Alexander
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Sunesson, Jonathan
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Incinerator 2.02014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta examensarbete är i grunden ett konstruktionsprojekt med syfte att utveckla en ny generation av dekontamineringsutrustning kallad Incinerator åt Getinge Sterilization AB. Incineratorn är en tryckbehållare som ska avdöda farliga sporer och utvecklades ursprungligen på 70-talet. Denna har uppdaterats flera gånger under dess livsspann men konstruktionen för med sig flera problem som nu ska lösas med en helt ny generation, kallad Incinerator 2.0. Projektet har främst handlat om konstruktion men beskriver även processteknik och dekontamineringprocess av farligt media. Då detta examensarbete berör tryckbehållare och dekontamineringsprocesser så har flera standarder och direktiv som t.ex. ASME BPVC och AFS2005:01 följts.  I detta examensarbete har en grund till Incineratorn 2.0 tagits fram i form av princip- och primärkonstruktion. Den här rapporten är en sammanställning av resultaten som har uppkommit under arbetets gång samt det slutliga resultatet som har uppnåtts. 

  • 225.
    Wennerberg, Ann
    et al.
    Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Albrektsson, Tomas
    Department of Biomaterials, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
    Surface Topography and Measuring Techniques for Dental Implant Applications – Possibilities and obstacles2012In: Implant Dentistry Research Guide: Basic, Translational and Clinical Research / [ed] Ahmed Ballo, New York, NY: Nova Science Publishers, Inc., 2012, p. 33-50Chapter in book (Refereed)
    Abstract [en]

    Surface topography has long been identified as a crucial parameter for successful osseointegration of oral implants. A paradigm shift occurred during the 1990s, when the huge majority of companies abandoned turned, minimally rough surfaces in favour of moderately rough surfaces. Several machining techniques have been used to increase the roughness from what was achieved with a turning process. An early obstacle was topographical description of surfaces; scanning electron microscopy (SEM) was often used as a description of the surfaces, but this technique provided no quantitative data. Thus it was, in many cases, difficult to know how one surface differed from another. Optical methods were developed during the late 1980s, and then it was possible to evaluate the threaded part of the implants relevant for osseointegration. Currently, general guidelines exist for how to measure implants surfaces, and a set of quantitative parameters have, after extensive research, been recommended for the topographical evaluation. However, the implant surfaces of today are often geometrically complex and include nanometer particles, porosity, coatings and deterministic patterning; thus the demands for new measuring techniques and evaluation methods increase. © 2012 by Nova Science Publishers, Inc. All rights reserved.

  • 226.
    Wihlborg, A.
    et al.
    Epsilon Development AB, Göteborg.
    Wiklund, Daniel
    Chalmers University of Technology, Göteborg.
    Rosén, B-G.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Surface indentation test (SIT) for friction prediction in mixed lubrication of coated sheets2002In: Boundary and mixed lubrication: science and application. Proceedings of the 28th Leeds-Lyon symposium on tribology / [ed] D. Dowson, M. Priest, G Dalmaz, A.A. Lubrecht, Amsterdam: Elsevier , 2002, p. 461-466Conference paper (Refereed)
  • 227.
    Wihlborg, Anders
    et al.
    Epsilon Development AB, Gothenburg, Sweden.
    Wiklund, Daniel
    Chalmers University of Technology, Gothenburg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    The Influence of Lubricants Kinematic Viscosity and Steel Sheet Surface-Topography in a Bending Under Tension Friction Test2001In: Tribology 2001 - scientific achievements, industrial applications, future challenges: plenary and session key papers from the 2nd World Tribology Congress ; Vienna, Austria, 3-7 September 2001 / [ed] F. Franek, W.J. Bartz, A. Pauschitz, Wien: Österreichische Tribologische Gesellschaft , 2001Conference paper (Refereed)
  • 228.
    Wiklund, Daniel
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Tribology of stamping: the influence of designed steel sheet surface topography on friction2006Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Tribology is the science of friction, wear, and lubrication; the interaction of surfaces in relative motion. The tribological conditions in sheet metal forming influences the flow of material in forming operations, the strain distributions of sheet material, extent of wear, and thereby the quality of products. The purpose of the thesis is to increase the knowledge of why and how sheet surface topography influence the frictional response in stamping, to characterise the geometrical properties, and make results applicable for industry. The frictional response of different surface topographies have been measured in a Bending Under Tension test under mixed lubricated conditions. The studied materials have been stainless steel sheets and uncoated and coated carbon steel sheets. The results did show the influence of roughness, skewness, and anisotropy of surface topography. The findings could be explained by the theory of pad bearings. A new functional 3D parameter (Sq>0) was developed for pressing performance that is sensitive to the effects of roughness and skewness. The texture-aspect ratio parameter (Str) was found to be correlated to the anisotropical behaviour of the frictional response. The results are very tangible and mean increased control of stamping operations. An initial step was taken to introduce more advanced tribological models in FE simulation of sheet metal forming operations. The aim is to decrease the trial-and-error time in the design process of dies and tools. A friction model considering surface topography (Sq>0), sliding velocity, lubricant viscosity, and apparent pressure, was successfully implemented. Simulations of a part were evaluated with real stamping tryouts. The results did show the potential of improving the precision in forming simulations with more advanced tribological models. Finally, theory and characterisation methods of active micro-oil pockets in the contact zone of tool and sheet were investigated. The real contact area was shown to be the critical feature to determine. Therefore, two topographical methods and one microscope-imaging processing technique were studied, but no method was found to be viable. However, the experimental results did not confirm the importance of microoil pockets in mixed lubricated regime.

  • 229.
    Wiklund, Daniel
    et al.
    Institutionen för material- och tillverkningsteknik, Tillverkningsteknik, Chalmers tekniska högskola.
    Nilsson, Larsgunnar
    Nilsson, Bertil
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).
    Andersson, Alf
    Rosén, Bengt Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Gunnarsson, Lars
    On the Implementation and Evaluation of a Roughness Based Friction Model in FE Simulations of Sheet Metal Forming2006In: Proceedings of The 12th Nordic Symposium on Tribology, Lyngby: DTU Mechanical Engineering , 2006Conference paper (Refereed)
  • 230.
    Wiklund, Daniel
    et al.
    Chalmers University of Technology, Materials and Manufacturing Technology, Göteborg, Sweden.
    Rosén, Bengt Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Wihlborg, A.
    Volvo Cars, MBO, Göteborg, Sweden.
    A friction model evaluated with results from a bending-under-tension test2009In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 42, no 10, p. 1448-1452Article in journal (Refereed)
    Abstract [en]

    The friction in stamping is an important process parameter to control the flow of material in the tool. Consequently, it is also an important parameter in the design process of new stamping tools when numerical simulations of the forming operations are performed. In this work an advanced friction model is evaluated, which considers properties of surface topography, lubricant, sheet material, and process parameters such as sliding speed and pressure. The evaluation is made by comparing theoretical results with experimental ones obtained in a bending-under-tension friction test. The results show conformance in behaviour between the friction model and the experimental work. Furthermore, a model, which considers the influence of bulk plastic strains on the real area of contact, is investigated. The developed model predicts that the effective hardness of a surface is reduced by the presence of underlying plastic flow. It is found that when the strain rates are increased, the Stribeck curve becomes flatter and mixed lubrication is introduced at lower Hersey values. The friction model clearly shows the potential of improving the FE simulations of sheet metal forming operations, in comparison to the use of the classical Coulomb's friction model.

  • 231.
    Wiklund, Daniel
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Gunnarsson, Lars
    KIMAB, Corrosion and Metals Research Institute AB, S-114 28 Stockholm, Sweden.
    Frictional mechanisms in mixed lubricated regime in steel sheet metal forming2008In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 264, no 5-6, p. 474-479Article in journal (Refereed)
    Abstract [en]

    The friction is of critical importance to sheet metal forming operations. It affects the flow of material in the tool and thereby the scrap rate and final quality of products. In the experimental work the frictional response was measured in a bending under tension (BUT) test under mixed lubricated conditions. The study includes stainless steel, but previous research on carbon steels, coated and uncoated, are discussed also. The experimental results could be explained by the theory of pad bearings. The frictional response showed a correlation to the surface topography, e.g. the amplitude parameter (Sq) and texture aspect ratio parameter (Str). When predicting the frictional response of surfaces with multi-component distributions, the standard deviation of the distribution above the mean line could be used.

  • 232.
    Wiklund, Daniel
    et al.
    Chalmers University of Technology.
    Wihlborg, Anders
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Evaluation of surface topography parameters for friction prediction in stamping2004In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 257, no 12, p. 1296-1300Article in journal (Refereed)
    Abstract [en]

    The continued globalisation of the automotive industry, leading to increasing demands for competitiveness and escalating legislative requirements, is the main driving force of research activities of steel sheet surfaces. Recent studies on the stamping process have been carried out among others within AUTOsurf, a project funded by the European Community, and by Wihlborg and Crafoord. The purpose of this study was to evaluate the viability of the proposed parameters for friction prediction. Seventeen different surface topographies were investigated. The sheet materials were either, hot-dip galvanised, electrogalvanised or galvannealed, and electron beam or electric discharged textures. The frictional response was measured in a bending under tension (BUT) test under mixed lubricated conditions. This BUT test simulates the conditions of the die radius in a stamping tool. The laboratory test differs from the experimental work performed in AUTOsurf which simulated the conditions of the holding-down plate. In spite of the differences in test equipments in AUTOsurf, e.g. the rotational friction tester (RTF), on a comparison the correlation of frictional response was significant. But neither of the proposed parameters could predict the frictional response with sufficient accuracy in this study. In addition, the friction model in AUTOsurf describes peak lubrication as a dragging phenomenon on sliding surfaces. The movement eased friction in inverse proportion to the average peak area. However, the trend in this study showed the opposite, movement eased friction proportionally to the average peak area. The result indicates a switch of dominant friction mechanism when the sliding velocity is increased, i.e. from a dragging phenomenon at low velocities to micro-hydrodynamic wedge effects at high velocities.

  • 233.
    Wiklund, Daniel
    et al.
    Calmers University of Technology, Gothenburg, Sweden.
    Wihlborg, Anders
    Epsilon Development, Gothenburg, Sweden.
    Rosén, B.-G.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    A Comparative Surface Topography Study of FEM Simulation and Surface Indentation Tests (SIT) on Friction Prediction in Steel Sheet Forming2003In: 10th Nordic Symposium on Tribology: NORDTRIB 2002, Stockholm: Kungliga Tekniska högskolan, 2003, p. 54-54Conference paper (Refereed)
  • 234.
    Xiao, L.
    et al.
    Chalmers University of Techonology, Göteborg.
    Rosén, Bengt Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Nilsson, P. H.
    Volvo Technology Corporation.
    Kalin, M.
    Centre for Tribology & Technical Diagnostics, Slovenia.
    Vižintin, J.
    Centre for Tribology & Technical Diagnostics, Slovenia.
    Rolling and rolling-to-sliding contact behaviour of DLC coatings2005In: Life cycle tribology: proceeding of the 31st Leeds-Lyon symposium on tribology held at Trinity and All Saints College, Horsforth, Leeds, UK, 7th-10th September 2004 / [ed] Dowson, D., Amsterdam: Elsevier, 2005, p. 213-220Conference paper (Refereed)
  • 235.
    Xiao, Li
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Gear tribology: friction and surface topography2005Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The quest for energy efficiency leads to the development of highly efficient power transmissions for vehicles. Gears are some of the most rugged and durable torque transmitters among machine elements. Friction between sliding surfaces at gear teeth is one major source of power loss. To increase efficiency and reduce damage accumulation in gears has always been a background motivation to this thesis. It focuses on the frictional performance of manufactured gear surfaces with emphasis on the effect of surface topography and the orientation of its lay.

    To achieve the goal of this work, a test rig was designed and constructed. The rig makes it possible to examine gear tooth friction on double crowned rollers. Five alternative gear-finishing processes are implemented in roller surface preparation. They comprise grinding, shotpeening, phosphating, chemical deburring and DLC coating. Theoretically, a friction model is suggested which helps to explain some of the testing results. Advanced surface metrology techniques and statistical tools are implemented in identifying surface features that influence friction.

    The result demonstrates that surface topography is a significant factor affecting the lubricated frictional behaviour. For ground-finishing, the smoother the surfaces are finished, the lower friction coefficient they show. Chemical deburring and DLC coating as well as certain degrees of phosphating provide minimum friction coefficient and improved load carrying capacity, which are competitive to fine-ground finishing. Properly designed lay combinations of meshing gear surfaces can minimise friction and improve gear transmission efficiency. Theoretically, the friction coefficient can be explained by means of a combination of the slide-to-roll ratio and the real mean contact pressure within the range of loads considered in this thesis. Finally, features that correlate surface topography to friction are identified.

  • 236.
    Xiao, Li
    et al.
    Chalmers University of Technology, Gothenburg, Sweden.
    Amini, Naser
    Volvo Car Corporation, Gothenburg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    An Experimental Study on the Effect of Surface Topography on Rough Friction in Gears2001In: Proceedings of the JSME International Conference on Motion and Power Transmissions: MPT2001-Fukuoka; November 15 - 17, 2001, Fukuoka, The Japan Society of Mechanical Engineers , 2001, Vol. 2, p. 547-552Conference paper (Other academic)
  • 237.
    Xiao, Li
    et al.
    Chalmers University of Technology, Production Engineering, Göteborg, Sweden.
    Björklund, Stefan
    KTH, Machine Design, Stockholm Sweden.
    Rosén, Bengt Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    The influence of surface roughness and the contact pressure distribution on friction in rolling/sliding contacts2007In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 40, no 4, p. 694-698Article in journal (Refereed)
    Abstract [en]

    A numerical contact model is used to study the influence of surface roughness and the pressure distribution on the frictional behaviour in rolling/sliding contacts. Double-crowned roller surfaces are measured and used as input for the contact analysis. The contact pressure distribution is calculated for dry static contacts and the results are compared with friction measurements in a lubricated rolling/sliding contact made with a rough friction test rig. The mean pressure is suggested as a parameter that can be used to predict the influence of surface roughness on the friction coefficient in such contacts. The results show two important properties of the friction coefficient for the friction regime studied in this paper: (1) there is a linear decrease in friction coefficient as a function of the slide-to-roll ratio, and (2) the friction coefficient increases linearly with increasing mean contact pressure up to a maximum limit above which the friction coefficient is constant. The absolute deviation of experimental results from the derived theory is for most cases within 0.005.

  • 238.
    Xiao, Li
    et al.
    Department of Production Engineering, Chalmers University of Technology, Gothenburg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Amini, Naser
    Volvo Car Corporation, Gothenburg, Sweden.
    Surface lay effect on rough friction in roller contact2004In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 257, no 12, p. 1301-1307Article in journal (Refereed)
    Abstract [en]

    Surface lay describes the direction of the predominant surface pattern. A properly designed surface texture configuration has been recognised as a vital issue affecting lubrication and sliding in machinery applications in the literature. Gaining understanding of this tribological phenomenon is no doubt beneficial in facilitating the production of more efficient machine parts and thus reduces production cost. This paper describes an experimental method to investigate the effect of surface lay on lubricated rolling/sliding of ground roller surfaces. By using the rough friction test rig, different surface lay contacts can be simulated and the friction can be measured. Friction behaviour was interpreted in terms of Stribeck curves (friction coefficient as the function of Hersey parameter [ηv/p]). Results show that an optimal contact lay angle that provides a minimum friction value is achievable through rig testing. The relative sliding speed direction has a symmetrical effect on friction at the same lay orientation; for sliding speed angles less than about 80, the larger the angle, the lower the friction, and vice versa. © 2004 Elsevier B.V. All rights reserved.

  • 239.
    Xiao, Li
    et al.
    Department of Production Engineering, Chalmers University of Technology, Gothenburg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Amini, Naser
    Volvo Car Corporation, Gothenburg, Sweden.
    Nilsson, Per H.
    Volvo Technological Development, Gothenburg, Sweden.
    A study on the effect of surface topography on rough friction in roller contact2003In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 254, no 11, p. 1162-1169Article in journal (Refereed)
    Abstract [en]

    The friction behaviour of gear teeth in the context of tribology can have a strong effect on housing vibration, noise and efficiency. One of the parameters that greatly influences the friction under certain running conditions is surface roughness. In this work, rough friction was studied in lubricated sliding of roller surfaces, which were manufactured to simulate the real gear surfaces. By examining 3D surface topography of two mating bodies, both surface roughness and its effect on friction behaviour can be studied. In a previous study, a rough-friction test rig has been designed, constructed and initially verified. The types of surfaces involved in this study are ground, shot-peened, phosphated and electrochemically deburred. These rollers were subjected to the same friction testing procedures. Roller surfaces were then examined, and correlation between the topography and the frictional behaviour was analysed. Friction behaviour was interpreted in terms of Stribeck curves (friction coefficient as the function of Hersey parameter (ην/p)). The results showed that electrochemically deburred and certain phosphated surfaces provide lower friction coefficient values which are competitive to fine-ground surfaces in lubricated rolling/sliding contact. © 2003 Elsevier Science B.V. All rights reserved.

  • 240.
    Zahouani, Hassan
    et al.
    Laboratoire de Tribologie et Dynamique des Systèmes, ENIS, St. Etienne, France.
    Mezghani, M.
    Laboratoire de Mécanique et de Procédés de Fabrication, Arts et Métiers ParisTech, Châlons en Champagne, France.
    El Mansori, M.
    Laboratoire de Mécanique et de Procédés de Fabrication, Arts et Métiers ParisTech, Châlons en Champagne, France.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Thomas, Tom
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Effect of Hölder Exponent of Roughness in Contact and Dry Friction Problems2009In: Proceedings of the 12th International Conference on Metrology and Properties of Engineering Surfaces / [ed] P. Pawlus, L. Blunt, B.-G. Rosén, T. Thomas, M. Wieczorowski, H. Zahouani, Rzeszow: Rzeszow Univ. of Technology , 2009Conference paper (Refereed)
  • 241.
    Zahouani, Hassan
    et al.
    Laboratoire de Tribologie et de Dynamique des Systèmes, Ecole Centrale de Lyon, Ecully, FRANCE; Ecole Nationale d'Ingénieurs, Saint-Etienne, France.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Thomas, Tom R.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    10th International Conference on Metrology & Properties of Engineering Surfaces: Guest editorial2008In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 264, no 5-6, p. 381-381Article in journal (Refereed)
2345 201 - 241 of 241
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