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  • 1.
    Albin, Lundgren
    et al.
    Halmstad University.
    Rudolf, Bengtsson
    Halmstad University.
    Fiberarmerad betong: En analys av fiberarmerat plattbärlag2021Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Fiber-reinforced concrete is a construction material that holds high promise in progressing theconstruction industry. The fibers impact on crackproperties as well as strength means there isa wide array of application areas. Still this material holds a very limited area of application asof today. One of the main reasons for this is the lack of examples and tests in new applicationareas. This work therefore aims to identify whether fiber-reinforced lattice girder elementscan compete with an element reinforced in the traditional way in any of the categories cost,work environment, strength or environmental impact. Through literature study andcalculations, we were able to see that this method of reinforcing lattice girder elements couldbe applicable at least in some of the areas. The study saw that the steel fiber came with anincrease in cost, decrease in time, bigger impact on the environment and a better workenvironment. This means that this method could be used in some specific cases where timeand work environment is of importance. We also see that further advancements in this methodcan be made if the fibers are combined with normal rebar.

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  • 2.
    Almgren, Anna
    Halmstad University, School of Business and Engineering (SET).
    Material- och tillverkningsteknikval för en stol åt Källemo2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta projekt har pågått under sista terminen på maskiningenjörsprogrammet vid högskolan i Halmstad. Projektet har utförts av en student och tillsammans med företaget Källemo. Syftet med projektet har varit att studenten ska hitta och utvärdera ett lämpligt material åt en ny stol. Materialvalet skulle också kompletteras med en lämplig tillverkningsmetod. Stolen är designad av Pierre Sindre, SandellSandberg, och kommer att produceras och säljas av Källemo. Pierre Sindres ritningar och renderingar var underlaget som var utgångspunkt för projektet. Arbetet har inneburit att olika material har utvärderats och framförallt formpressad filt. Lämpligheten har testat genom liknande referensmöbler och fysiska tester. Bland annat har provbitar testat med enkla handtester. En dialog har också förts med leverantörer av material som haft mycket erfarenhet och kunnat bidra med tips och idéer.  Då projektet inte har varit ett typiskt konstruktionsprojekt har metoden utvecklats efterhand som olika resultat uppkommit. Detta har varit ett arbetssätt som har varit väldigt lärorikt för studenten och också väldigt tidseffektivt då ingen onödig tid har lagt på irrelevanta processer. Varje steg i arbetets gång har diskuterats med både uppdragsgivaren på företaget och två handledare som högskolan tillhandahållit. Veckomöten varje vecka har också bidragit till ett mycket tidseffektivt arbete där snedsteg tidigt kunnat upptäckas av de med mer erfarenhet. Dessa möten har varit avgörande för det goda resultatet som erhållits. Resultatet består av fem lösningsförslag som tagits fram och vid diskussion med företaget och leverantörer utmynnat i ett slutligt resultat som nu är färdigt för produktion. När projektet avslutades var den första delen i produktion och således målet med projektet uppfyllt.

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    Examensarbete, Anna Almgren
  • 3.
    Amanda, Hugosson
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Carolina, Martinsson
    Halmstad University, School of Business and Engineering (SET).
    Konstruktion och design av duschredskap2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I denna rapport presenteras ett examensarbete som syftar till att ta fram idéer för en användarvänlig produkt, anpassad till dusch- och badrumsmiljöer som gör att äldre och funktionsnedsatta kan klara sig mer självständigt i hemmet. Arbetet har utförts tillsammans med uppdragsgivaren Jörgen Carlsson, produktchef på företaget Macro International AB (Macro) som tillverkar, utvecklar och säljer badrumslösningar med duschar och möbler. Examensarbetet har genomförts på Högskolan i Halmstad under våren 2014 och omfattar 15 högskolepoäng.

    Målet med projektet var att utifrån ett valt koncept utveckla en prototyp som passar till Macros nuvarande duschsortiment samt ta fram konstruktionsritningar för eventuell tillverkning av produkten. Produkten skulle vara lätt att montera för privatpersoner samt utstråla den känsla, enkelhet, personlighet och spänning som företaget strävar efter i alla sina produkter.

    Arbetet inleddes med en omfattande marknadsundersökning där tolkningen och resultatet av undersökningen tillsammans med uppdragsgivarens åsikter ledde till ett antal idéer att gå vidare med och utveckla. Två designmetodiker har kombinerats med en konstruktionsmetodik vilket har lett till ett slutligt resultat av ett duschredskap som kan användas som stöd i Macros duschar ”Skagen” och ”Fjord”. En prototyp av produkten tillverkades i Macros 3D-skrivare. Bildrenderingar och en monteringsfilm gjordes med hjälp av KeyShot 4, Catia V5 och Photoshop CS6. Även färdiga ritningar som kan användas vid en eventuell tillverkning är bifogade i rapporten.

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    Konstruktion och design av duschredskap
  • 4.
    Anderberg, Cecilia
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Pawlus, P.
    Rzeszow University of Technology, Poland.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Thomas, T. R.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Alternative descriptions of roughness for cylinder liner production2009In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 209, no 4, p. 1936-1942Article in journal (Refereed)
    Abstract [en]

    The roughness of stratified surfaces such as cylinder liners, produced by plateau honing, is functionally important in their tribology but is notoriously difficult to characterise. An issue in manufacturing quality control related to their tribological function is the comparative ability of various roughness characterisation systems. In this paper the Rk family of parameters is compared with the Rq family as regards stability and discrimination. When coefficients of variation of the two parameter families are compared as a measure of stability, CVs of individual parameters vary between 8% and 20% but do not seem to indicate a clear advantage to either family. When the correlation of parameters within and between the two groups is computed as a measure of relative discriminative ability, many parameters are found to be highly correlated, to the point where values of Rpk and Rpq are effectively indistinguishable. The relative robustness of the parameters is also established by simulation of surface or measurement artefacts: outlying peaks and valleys, high-frequency noise, changes in stylus or skid radius, changes in high-pass filter and in assessment length. Outlying peaks cause a large increase in Rpk, while outlying valleys have little effect. The Rq parameters are more sensitive to high-frequency noise than the Rk parameters. Increasing the stylus radius reduced the valley parameters, while adding a 25 mm radius skid increased Rk and Rpq by as much as 15%. Increasing the short-wavelength cut-off from 2.5 m to 8 m reduced most parameters, particularly the peak parameters, while replacing the robust Gaussian filter used throughout by a valley-suppression filter had little effect. Finally reducing the assessment length from 17 mm to 4 mm decreased the values of many parameters by up to 11%. Increasing plateau honing time decreased plateau roughness, while increasing pressure during coarse honing increased valley roughness, but these changes could not be correlated with roughness parameters. This suggests that the optimum parameter set has not yet been found. 2008 Elsevier B.V. All rights reserved.

  • 5.
    Andersson, Viktor
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Olsén, Martin
    Halmstad University, School of Business and Engineering (SET).
    Kilhus i plast: Omläggning av stålprodukt till produkt i plast2010Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Abstract

    Our bachelor degree thesis was carried out in collaboration with Ivar Petterssons Järnmanufaktur AB in Smålandsstenar. We were asked to replace their wedge housing, used to fasten the wires to the power lines, with a similar structure in a plastic material. The idea for this project started with Ivar Petterssons Järnmanufaktur AB having problems with the casting quality that forced them to perform expensive tests on each of the wedge houses to ensure the quality. They are currently produced in China which is also a major drawback because it requires expensive long delivery times.

    The method we used is Fredy Olsson's Princip- and Primärkonstuktion (1995). We have consistently been in the project on so-called "broad front", which means that you create several sketches, ideas and changes in parallel, and then evaluates all. With this method we were able to largely concentrate on the current part of the project, rather than using the more time-consuming "trail and error" method, which is basically doing one idea at a time, and evaluate them one by one.

    At first we were very optimistic and thought we would be able to order form for the injection moulding process, but as the project progressed we found we were not certain that the product would hold and we were forced to present the solution as a concept that will require testing before it’s finished, and not a finished solution.The results we presented for Ivar Pettersssons Järnmanufaktur is a complete drawing on our primary solution, including the release angles. This is because when they decide to go forth with the project, it will be possible to produce a tool without having to make changes to the drawings. Temporary financial calculation shows that the savings may be realized around 1 300 000 SEK by switching to a plastic construction. However we have not been able to verify hours and therefore no cost estimates for the testing done in Sweden, so the actual amount of money saved is larger.

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  • 6.
    Antila, Eric
    Halmstad University, School of Business, Innovation and Sustainability.
    SunTrack2021Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    For many of us, electricity is a natural and necessary source, making it easier to go about our everyday life. Imagine having to collect firewood, for several hours a day, to be able to carry out such a simple task as preparing a meal. For many people, especially in developing countries, everyday life looks just like that, but it does not have to. In line with the increasing demand of sustainability, new technologies now turn their focus to the almost inexhaustible source of energy, namely the sun.

    The energy that is being received every day in the form of solar radiation, corresponds to about 8000 times more energy than what is being consumed on the planet, throughout anentire year. With today's technology, there is now a possibility to farm parts of this energy, to be used as a more sustainable alternative. 

    Sunfurias product uses a technology that, with the help of solar collectors, saves solar energy in a heat storage, enabling cooking at any time.

    For the solar collectors to be as efficient as possible, they need to rotate following the movement of the sun throughout the day. Today, this is done by using an advanced tracking device, which in turn makes the entire product significantly more expensive. Which also affects the sales volume, especially in the developing countries.

    The SunTrack project has been carried out in collaboration with Sunfuria AB to solve the need for a more affordable product, by developing a cost-effective alternative to the current solar tracking system.

  • 7. Bellini, Anna
    et al.
    Gabrielson, Per
    Wiklund, Daniel
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Gunnarsson, L.
    Frictional properties of different austenitic stainless sheet surface topographies: Industrial trials at Alfa Laval2006Conference paper (Refereed)
  • 8.
    Berglund, J.
    et al.
    Sandvik Tooling, R & D Center Olofström, Olofström, Sweden.
    Agunwamba, C.
    Mathematical Sciences Department, Worcester Polytechnic Institute, Worcester, Massachusetts.
    Powers, B.
    Worcester Polytechnic Institute, Worcester, Massachusetts.
    Brown, C. A.
    Surface Metrology Lab, Worcester Polytechnic Institute, Worcester, Massachusetts.
    Rosén, Bengt Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    On discovering relevant scales in surface roughness measurement: an evaluation of a band-pass method2010In: Scanning, ISSN 0161-0457, E-ISSN 1932-8745, Vol. 32, no 4, p. 244-249Article in journal (Refereed)
    Abstract [en]

    When characterizing surfaces and searching for correlations to functional properties, such as friction, finding the right scale of roughness for evaluation can improve correlations. However, in traditional roughness parameter analysis, a wide range of scales, or all scales of topography in the surface roughness measurements are evaluated together. In this study a multi-scale method using a series of band-pass filters is employed for finding scales of topography with strong correlations to friction.

  • 9.
    Berglund, J.
    et al.
    Research Technology Center Die & Mould, Sandvik Tooling Sverige AB, Olofström, Sweden.
    Rosén, Bengt Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    A method development for correlation of surface finish appearance of die surfaces and roughness measurement data2009In: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 36, no 2, p. 157-164Article in journal (Refereed)
    Abstract [en]

    In die and mould manufacturing, the method used for quality control of finished surfaces is usually visual and tactile inspection of the finish, which is not easily quantifiable. In the present study, an evaluation of the connection between surface finish appearance and measured surface roughness was carried out using scale-sensitive fractal analysis to find functional correlations and to determine suitable cut-off limits for functional data filtration. A selection of ball-nose end-mills in combination with two different tool steels (hardness 39 and 47 HRC) were used to manufacture surfaces that were inspected and measured. It was found that the method developed in the present study for evaluating functional correlations and designing filters worked well. It was also found that there is a correlation between the surface roughness parameter Sq and the surface finish appearance and that this correlation is stronger in certain wavelengths on the surface.

  • 10.
    Berglund, Johan
    et al.
    Sandvik Tooling, R & D Center Olofström, Sweden.
    Liljengren, Magnus
    Olofström School of Automotive Stamping, Olofström, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    On finishing of pressing die surfaces using machine hammer peening2011In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 52, no 1-4, p. 115-121Article in journal (Refereed)
    Abstract [en]

    Machine hammer peening (MHP) is a new method for finishing of surfaces. With this method, the workpiece surface is hammered with a spherical carbide tool. The main objective of the study was to evaluate whether the MHP method could become a plausible substitute for manual polishing in pressing die manufacturing where nodular cast iron is a common workpiece material. To do this, sample nodular cast iron surfaces were hammered and evaluated. Changes to the surfaces were evaluated using surface roughness measurements, hardness measurements and optical images. First of all, the workpiece surface was smoothened. Secondly, the surface hardness was increased significantly. Thirdly, the nodules on the workpiece surface were affected. They appeared to be smaller and not as visible. This effect would likely create a die surface less prone to galling since the cavities would not be filled with sheet metal to the same extent in a forming operation. In addition, with MHP, the amount of polishing needed to manufacture a die surface can be reduced because of the smoothening effect.

  • 11. Berglund, Johan
    et al.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Robust and Easy to Use Quality Control of Roughness on Milled Tool Steel Surfaces2008In: Proceedings of the 18th International Conference on Flexible Automation and Intelligent Manufacturing: FAIM 2008, June 30th – July 2nd, 2008 University of Skövde, Sweden, Skövde: Skövde University , 2008, p. 284-289Conference paper (Refereed)
    Abstract [en]

    This study was an evaluation of measuring strategies using a handheld 2D profiler for quality control of finish milled tool steel with regard to surface roughness. A selection of ball nose end mills in combination with two different tool steels (hardness 39 and 47 HRC) were used to manufacture the surfaces that were to be measured. It was found that using an appropriate measuring strategy it is possible to measure the roughness of these relatively smooth surfaces (0.1<1µm) with satisfactory accuracy using a handheld profiler. However, it was also found that, in contrast to what is common practice, Ra is not a suitable parameter to use for evaluation. Instead, using Rz or Rp is suggested. To be able to control quality, the machining process (selection of cutting tool, cutting data, workpiece material etc) as well as limits for the evaluated parameters first have to be established.

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  • 12.
    Berglund, Johan
    et al.
    Institutionen för material- och tillverkningsteknik, Tillverkningsteknik, Chalmers tekniska högskola .
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Surface Finish and Roughness Measurement in Die and Mould Manufacturing2008In: Proceedings of the 2'nd Swedish Production Symposium, 2008, p. 385-391Conference paper (Refereed)
    Abstract [en]

    In die and mould manufacturing, the method used for quality control of finished surfaces is usually visual and tactile inspection of the finish, which is not easily quantifiable. In this study, an evaluation of the connection between surface finish appearance and measured surface roughness was carried out using scale-sensitive fractal analysis to find functional correlations and to determine suitable cut-off limits for functional data filtration. A selection of ball nose end mills in combination with two different tool steels (hardness 39 and 47 HRC) were used to manufacture surfaces that were measured. It was found that the method employed in this study for evaluating functional correlations and designing filters worked well. It was also found that there is a correlation between the surface roughness parameter Sq and the surface finish appearance and that this correlation is stronger in certain wavelengths on the surface.

  • 13.
    Berglund, Johan
    et al.
    Advanced Engineering, Sandvik Tooling, Olofström, Sweden.
    Wiklund, Daniel
    Forming Processes, Swerea IVF, Mölndal, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    A Method for Visualization of Surface Texture Anisotropy in Different Scales of Observation2011In: Scanning, ISSN 0161-0457, E-ISSN 1932-8745, Vol. 33, no 5, p. 325-331Article in journal (Refereed)
    Abstract [en]

    Anisotropy of functional surfaces can in many practical cases significantly influence the surface function. Tribological contacts in sheet forming and engine applications are good examples. This article introduces and exemplifies a method for visualization of anisotropy. In a single graph, surface texture properties related to the anisotropy as a function of scale are plotted. The anisotropy graph can be used to explain anisotropy properties of a studied surface such as texture direction and texture strength at different scales of observation. Examples of milled steel surfaces and a textured steel sheet surface are presented to support the proposed methodology. Different aspects of the studied surfaces could clearly be seen at different scales. Future steps to improve filtering techniques and an introduction of length-scale analysis are discussed.

  • 14.
    Binotto, A.P.D.
    et al.
    Fraunhofer IGD / TU Darmstadt, Germany.
    Pignaton de Freitas, Edison
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Pereira, Carlos Eduardo
    PPGC UFRGS, Brazil.
    Stork, André
    Fraunhofer IGD / TU Darmstadt, Germany.
    Larsson, Tony
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Real-time task reconfiguration support applied to an UAV-based surveillance system2008In: 2008 International Multiconference on Computer Science and Information Technology (Imcsit) / [ed] Ganzha, M, Piscataway, N.J.: IEEE Press, 2008, p. 581-588Conference paper (Refereed)
    Abstract [en]

    Modern surveillance systems, such as those based on the use of Unmanned Aerial Vehicles, require powerful high- performance platforms to deal with many different algorithms that make use of massive calculations. At the same time, low- cost and high-performance specific hardware (e.g., GPU, PPU) are rising and the CPUs turned to multiple cores, characteriz- ing together an interesting and powerful heterogeneous execu- tion platform. Therefore, reconfigurable computing is a poten- tial paradigm for those scenarios as it can provide flexibility to explore the computational resources on heterogeneous cluster attached to a high-performance computer system platform. As the first step towards a run-time reconfigurable workload bal- ancing framework targeting that kind of platform, application time requirements and its crosscutting behavior play an impor- tant role for task allocation decisions. This paper presents a strategy to reallocate specific tasks in a surveillance system composed by a fleet of Unmanned Aerial Vehicles using aspect- oriented paradigms in order to address non-functional applica- tion timing constraints in the design phase. An aspect support from a framework called DERAF is used to support reconfigu- ration requirements and provide the resource information needed by the reconfigurable load-balancing strategy. Finally, for the case study, a special attention on Radar Image Process- ing will be given.

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  • 15. Blaesild, Morgan
    et al.
    Alvtegen, Josefin
    Huledal, Oskar
    Produktutveckling med Svenska Brunalger2019Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
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  • 16.
    Blixt, Lukas
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Harmath, Laszlo
    Halmstad University, School of Business and Engineering (SET).
    Uttorkning av Betong2011Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
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    Uttorkning av Betong
  • 17.
    Borgström, Karin Margaretha
    et al.
    Halmstad University, School of Business, Engineering and Science, Centre for Innovation, Entrepreneurship and Learning Research (CIEL), Sustainability, Innovation and Management in Building (SIMB).
    Böhm, Benny
    Technical University of Denmark.
    A method for using thermistors to measure thermal conductivity1996Report (Other academic)
    Abstract [en]

    This report presents some measurements for determining thermal conductivity in different materials, using a single thermistor. This thermal conductivity measurement technique is appropriate for materials like fine-grained soils, gel-like materials such as silicon grease, and insulation materials. To verify the usefulness of this method, additional measurements are needed for several materials with well-known thermal conductivities, especially solid materials with thermal conductivity in the range of 0.5-2.5 W/m C.

  • 18.
    Bournias-Varotsis, Alkaios
    et al.
    Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, United Kingdom.
    Friel, R. J.
    MAX IV Laboratory, Lund University, Lund, Sweden.
    Harris, Russell A.
    Mechanical Engineering, The University of Leeds, Leeds, United Kingdom.
    Engstrøm, Daniel S.
    Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, United Kingdom.
    Ultrasonic Additive Manufacturing as a form-then-bond process for embedding electronic circuitry into a metal matrix2018In: Journal of Manufacturing Processes, ISSN 1526-6125, Vol. 32, p. 664-675Article in journal (Refereed)
    Abstract [en]

    Ultrasonic Additive Manufacturing (UAM) is a hybrid manufacturing process that involves the layer-by-layer ultrasonic welding of metal foils in the solid state with periodic CNC machining to achieve the desired 3D shape. UAM enables the fabrication of metal smart structures, because it allows the embedding of various components into the metal matrix, due to the high degree of plastic metal flow and the relatively low temperatures encountered during the layer bonding process. To further the embedding capabilities of UAM, in this paper we examine the ultrasonic welding of aluminium foils with features machined prior to bonding. These pre-machined features can be stacked layer-by-layer to create pockets for the accommodation of fragile components, such as electronic circuitry, prior to encapsulation. This manufacturing approach transforms UAM into a “form-then-bond” process. By studying the deformation of aluminium foils during UAM, a statistical model was developed that allowed the prediction of the final location, dimensions and tolerances of pre-machined features for a set of UAM process parameters. The predictive power of the model was demonstrated by designing a cavity to accommodate an electronic component (i.e. a surface mount resistor) prior to its encapsulation within the metal matrix. We also further emphasised the importance of the tensioning force in the UAM process. The current work paves the way for the creation of a novel system for the fabrication of three-dimensional electronic circuits embedded into an additively manufactured complex metal composite. © 2018 The Society of Manufacturing Engineers

  • 19.
    Bäck, Rickard
    Halmstad University, School of Business and Engineering (SET).
    Koncept för hållare till baklyktor2011Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

    I denna rapport presenteras olika koncept på hur utformningen av hållare till baklyktor kan se ut. Arbetet är ett samarbete mellan författaren och Specialkarosser AB.

    En mängd olika lösningar har utarbetats där det till slut uppenbarats fyra olika koncept på lösningar. Dessa olika lösningar har vägts mot varandra utifrån den metod som använts. Resultatet av dessa bedömningar blev ett koncept där tanken bakom lösningen är att utforma en kapsel som efterliknar det formspråk som finns på framlyktorna på lastbilar, samt att den ska kunna kombineras med flera likadana kapslar för att få fler lyktor.

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  • 20.
    Bååth, Lars
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    A method for simultaneously measuring the positions of more than one surface in metallurgic processes1994Patent (Other (popular science, discussion, etc.))
  • 21.
    Bååth, Lars
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    A method to simultaneously measuring the position of more than one surface in metallurgical processes1997Patent (Other (popular science, discussion, etc.))
    Abstract [en]

    A method for measuring the position of at least one surface in a metallurgical process which includes the steps of providing a metallurgical melt, the metallurgical melt including at least a metal portion and a slag layer, providing a signal generator for generating signals at a plurality of frequencies over a frequency band, and providing an antenna for receiving the signals generated by the signal generator and for transmitting circularly polarized radio waves at the plurality of frequencies over the frequency band. The invention further includes the steps of disposing the antenna adjacent the metallurgical melt, transmitting the circularly polarized radio waves from the antenna toward the metallurgical melt, the circularly polarized radio waves being transmitted by the antenna at the plurality of frequencies over the frequency band, receiving reflected images of the transmitted radio waves through the antenna, the received reflected images of the transmitted radio waves having a substantially opposite circular polarization from the transmitted circularly polarized radio waves, determining a phase displacement between the transmitted radio waves and the received reflected images of the transmitted radio waves, transforming the determined phase displacement from a frequency to a time plane, and determining from the time plane transform a position of at least one surface of at least one of the metal portion and the slag layer.

  • 22.
    Cabanettes, Frederic
    et al.
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS). Halmstad Univ, Sch Business & Engn, SE-30118 Halmstad, Sweden..
    Rosén, Bengt Göran
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Topography changes observation during running-in of rolling contacts2014In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 315, no 1-2, p. 78-86Article in journal (Refereed)
    Abstract [en]

    The automotive industry and the design of engines are strongly ruled by performance and legislation demands. In the valve train, besides the main function (transformation of rotation to translation movements) to fulfill, new requirements in environmental demands and performance in terms of wear are leading to more and more detailed studies of the cams and rollers. Wear reduction studies for prolonging lifetime of these components require decreasing the scale of observation down to roughness. Among the different wear stages of a component, the running-in is a crucial period which will greatly influence the lifetime and performance of components. The aim of this paper is to analyze the topography variations observed during the running-in of a camshaft on a valve train rig test. A truck engine's camshaft is run under realistic conditions and 3D surfaces are measured before and after the test by using relocation techniques. By measuring the very same surfaces before and after the experiment, a deep analysis of the running-in effects on surfaces can be performed. 3D surface roughness parameters are used in parallel with new proposed methods of analysis. As a result, the mechanisms involved during running-in are emphasized and can be used for further simulations and optimization of the cam roller contact. (C) 2014 Elsevier B.V. All rights reserved.

  • 23.
    Cabanettes, Frédéric
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Cam Roller Contact: The topographical aspect2008Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The automotive industry and the design of engines are strongly ruled by performance and legislation demands. First order aspects defining the main functions of a component are well known and new challenges appear at a lower scale. Wear reduction is defined as a second order problem and requires decreasing the scale of observation of components down to roughness. This thesis work and its aim lie within the scope of wear improvements and are focused on the injection cam/roller contact of heavy duty diesel engines. In order to reach the aim several material and methods are used: a valve train rig test, roughness characterisation and different manufacturing processes. It is shown by experiments that the flank and nose of injection cams are specific areas with specific roughness (higher density of summits Sds) compared to the rest of the cam. The wear is characterized by rounded-off of summits (Ssc). From those results and since wear processes are strongly linked to the pressure generated between the mating surfaces, the development of a rough contact model is of great interest. An elastic rough contact model is implemented and improved later on by an elasto-plastic description of materials. The simulations are validated by a wear test and are used to rank the ability of surfaces (both cam and roller) to face wear problems. The ratio of plastically deformed peaks shows that the flank and nose of the cam are reacting badly to pressures. Additionally the rough contact allows ranking/optimization of different machining processes with respect to their expected functional contact performance. Future work will be to use such a model to choose a good combination of surfaces (cam and roller) in order to reduce wear.

  • 24.
    Cabanettes, Frédéric
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Evaluation of cam and roller surfaces and their manufacturing process by functional characterization2008In: Proceedings of the Swedish Production Symposium 2008, Stockholm: Swedish production symposium , 2008, , p. 7Conference paper (Refereed)
  • 25.
    Cabanettes, Frédéric
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Tribological aspect of the surface topography variations for injection cams2008In: Proceedings of the NORDTRIB 2008 / [ed] Jaakko Kleemola and Arto Lehtovaara, Tampere: Tampere University Press, 2008, , p. 16Conference paper (Refereed)
  • 26.
    Cabanettes, Frédéric
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Claret-Tournier, Julien
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Mohlin, Johan
    Finnveden Powertrain.
    Nilsson, P.-H.
    Volvo Technology Corporation.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Xiao, L.
    Volvo Powertrain Corporation.
    The evolution of surface topography of injection cams2009In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 266, no 5-6, p. 570-573Article in journal (Refereed)
  • 27.
    Cabanettes, Frédéric
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Mohlin, Johan
    Finnveden Powertrain, Lidköping, Sweden.
    Nilsson, Per Henrik
    Volvo Technology Corporation, Göteborg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Evaluation of cam surfaces by wear testing and functional characterization2008In: Synopses / 35th Leeds-Lyon Symposium on Tribology, Leeds: Leeds University , 2008Conference paper (Other academic)
    Abstract [en]

    Friction and wear are constant problems encountered in camshaft development. The contact between roller and cam is a mix of sliding and rolling which leads to a wide range of failure modes. The uniqueness of this contact is also due to variations all around the cam of a multitude of parameters such as load and radius. A previous study described surface topography as a function of cam shape. The different types of wear mechanisms are strongly linked to contact pressures which are also dependent on roughness. The aim of the paper is to develop a rough contact model which will be utilized as a tool to rank surfaces and their ability to face wear problems. In order to verify the tool, rough contact results are compared to roughness parameter variations due to wear produced in a cam roller rig test. The surface measurements used for this study are made by a non-contact light interferometer. The Greenwood-Williamson contact model has been developed in a deterministic way and the elasto-plastic behaviour of the material has been integrated to the model. The outputs of the simulation give a ranking of surfaces which is compared to their roughness variations due to wear. The study shows that the model developed is a reliable tool to rank and define surface quality since the results are correlated to wear. However, the results show as well some discrepancies which could be corrected in the future by integrating to the model two new features: a rough to rough contact including sliding between surfaces. This new model should be verified by an accurate experimentation using relocation between unworn and worn surfaces.

  • 28.
    Cabanettes, Frédéric
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Mohlin, Johan
    Finnveden Powertrain, Lidköping, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Experimental study of cam/roller wear using advanced characterization tools for relocated surfaces2009In: Proceedings of the 3rd Swedish production symposium / [ed] Bengt-Göran Rosén, Swedish Production Academy , 2009, p. 197-203Conference paper (Refereed)
  • 29.
    Campanini, D.
    et al.
    Department of Physics, Stockholm University, Stockholm, SE-106 91, Sweden.
    Diao, Zhu
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab.
    Rydh, Andreas
    Department of Physics, Stockholm University, Stockholm, SE-106 91, Sweden.
    Raising the superconducting Tc of gallium: In situ characterization of the transformation of α -Ga into β -Ga2018In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 18, article id 184517Article in journal (Refereed)
    Abstract [en]

    Gallium (Ga) displays several metastable phases. Superconductivity is strongly enhanced in the metastable β-Ga with a critical temperature Tc=6.04(5)K, while stable α-Ga has a much lower Tc<1.2K. Here we use a membrane-based nanocalorimeter to initiate the transition from α-Ga to β-Ga on demand, as well as study the specific heat of the two phases on one and the same sample. The in situ transformation is initiated by bringing the temperature to about 10K above the melting temperature of α-Ga. After such treatment, the liquid supercools down to 232K, where β-Ga solidifies. We find that β-Ga is a strong-coupling type-I superconductor with Δ(0)/kBTc=2.00(5) and a Sommerfeld coefficient γn=1.53(4)mJ/molK2, 2.55 times higher than that in the α phase. The results allow a detailed comparison of fundamental thermodynamic properties between the two phases. © 2018 American Physical Society.

  • 30.
    Carlsson, J.
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Malmqvist, L.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Nilsson, C.M.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Persson, W.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Application of optical fluorescence spectroscopy to paper production1999In: TAPPI INTERNATIONAL PAPER PHYSICS CONFERENCE, Atlanta: Tappi Press , 1999, p. 429-436Conference paper (Refereed)
    Abstract [en]

    Fluorescence light emitted from paper following the absorption of either ultraviolet or visible light has a wavelength distribution determined by the chemical composition of the paper. This can be used both for laboratory measurements of paper characteristics and for on-line monitoring of the paper during production. Such measurements can be performed non-intrusively at sampling rates high enough to give a sub-millimetre resolution in the machine direction in a paper machine or rerewinder. In this project two types of fluorescence monitors have been constructed. They are operating at different wavelengths and thereby they monitor different substances in the paper. The monitors have been tested at newsprint producing paper mills together with an optical speedometer. The measurements in the production environment have shown that the equipment is capable of indirectly monitoring paper quality parameters which affect the local abundance of lignin. Examples of such parameters are the number of shives in the paper and wire marks. A fluorescence based method for scanning cross-directional newsprint profiles in the laboratory has been developed. From these measurements the relative shrinkage of the paper during drying can be calculated using time-frequency analysis.

  • 31.
    Chandran, Sarath
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Abraham Mathews, Jithin
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Simulation and Optimization of CNC controlled grinding processes: Analysis and simulation of automated robot finshing process2016Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesis
    Abstract [en]

    Products with complicated shapes require superior surface finish to perform the intended function. Despite significant developments in technology, finishing operations are still performed semi automatically/manually, relying on the skills of the machinist. The pressure to produce products at the best quality in the shortest lead time has made it highly inconvenient to depend on traditional methods. Thus, there is a rising need for automation which has become a resource to remain competitive in the manufacturing industry.

    Diminishing return of trading quality over time in finishing operations signifies the importance of having a pre-determined trajectory (tool path) that produces an optimum surface in the least possible machining time. Tool path optimization for finishing process considering tool kinematics is of relatively low importance in the present scenario. The available automation in grinding processes encompass around the dynamics of machining.

    In this paper we provide an overview of optimizing the tool path using evolutionary algorithms, considering the significance of process dynamics and kinematics. Process efficiency of the generated tool movements are studied based on the evaluation of relative importance of the finishing parameters. Surface quality is analysed using MATLAB and optimization is performed on account of peak to valley height.

    Surface removal characteristics are analysed based on process variables that have the most likely impact on surface finish. The research results indicated that tool path is the most significant parameter determining the surface quality of a finishing operation. The inter-dependency of parameters were also studied using Taguchi design of experiments. Possible combinations of various tool paths and tool influencing parameters are presented to realize a surface that exhibits lowest errors.

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  • 32.
    Cronquist, Björn
    et al.
    Kristianstad University College, Sweden.
    Johansson, Lars-Olof
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Innovation in SME: A Case of Firm-Supportive Research2009In: IRIS 32: selected papers of the 32nd Information Systems Research Seminar of Scandinavia : Inclusive design : IRIS 32 was hosted at Molde University College, Norway 9.-12. August 2009 / [ed] Judith Molka-Danielsen, Trondheim: Tapir Akademisk Forlag, 2009, p. 187-201Conference paper (Refereed)
    Abstract [en]

    This paper describes a case of collaboration between academia and business firms in supporting innovation processes. The research developed into a firm-supportive model called the CILO method, named after the CILO project (communication in learning organisations). We describe the outcomes from applying the CILO method in relation to one of the partner companies and discuss the methodological implications in relation to established research models. We propose the notion of firmsupportive research as a concept to consider in research aiming at developing business firms.

  • 33.
    Davidenko, N. A.
    et al.
    Kiev Taras Shevchenko National University, Kiev, Ukraine.
    Davidenko, I. I.
    Kiev Taras Shevchenko National University, Kiev, Ukraine.
    Savchenko, I. A.
    Kiev Taras Shevchenko National University, Kiev, Ukraine.
    Popenaka, A. N.
    Kiev Taras Shevchenko National University, Kiev, Ukraine.
    Bååth, Lars B.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Electro-optical effect in films of azobenzene polycomplexes with cobalt2008In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 103, no 9, p. Article number 094323-Article in journal (Refereed)
    Abstract [en]

    Polymeric films containing azobenzene fragments with donor and acceptor groups were produced as well as films of polycomplexes of these fragments with cobalt. Absorption spectra of these films before and during application of an external electric field were investigated. Electro-optical properties of the films are conditioned by spatial reorientation of dipole moments of azobenzene groups induced by polarized light in an external electric field. Increase in dipole moments of azobenzene groups reduces the influence of cobalt ions on the electro-optical properties of the polycomplex films. In the proposed phenomenological model, the electro-optical effect is explained by effect of induced forces upon azobenzene isomers and metallic ions.

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  • 34.
    Dimkovski, Zlate
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    On Surface Topography of Cylinder Liners2008Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The frictional losses, oil consumption and emissions in internal combustion engines are in great extent controlled by the cylinder liner surface topography. This emphasises the importance of: investigating the liner’s topography by objectively characterising it, investigating its effects on the tribological function to gain a better understanding and improving its manufacturing. As a first attempt in this study to objectively characterise the liner surface, a traditional combination of Scanning Electron Microscope (SEM) images and roughness profiles was used. The groove and image parameters characteristic for liner topographies were extracted by applying specially developed algorithms and together with the standard parameters served to study wear on liners of diesel and petrol engines. An experiment was designed to improve the liners’ manufacturing by varying of the honing process parameters and oil flow simulations were run to study the influence of the characteristics of the manufactured surfaces on their function. The results suggested that reducing the base honing pressure and increasing the plateau honing time gave the best surface with smoother plateaux, summits of higher density and milder slopes, more but smaller islands and shallower valleys. The potentials of fast acquiring and containing 3D data of the interference measurements were utilised to overcome the encountered problems in the usage of the combination of profile and SEM measurements and to enable automatic quality control of the cylinder liner surfaces. In the efforts to examine the influence of the surface properties on liner’s function, the extent of blechmantel (cold work material) removal was estimated from 3D measurements of run liners in engine tests. For characterising this feature, algorithms were developed and implemented and it was found that the most of the blechmantel is still left on the liner pointing that it plays a minor role on wear.

  • 35.
    Dimkovski, Zlate
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Surfaces of Honed Cylinder Liners2011Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Cylinder liner surfaces are often on the agenda of engine developers because of their large influence on the frictional losses, oil consumption and emissions of internal combustion engines. Improving the liner function involves not only manufacturing new surfaces and checking their function but also characterising them as a necessary intermediate step for better understanding of the changes made. In the manufacturing of the liners, honing is a well adapted and widely used finishing process and along with the characterisation and function has been the subject of studies in this thesis. Regarding the liner’s function, three phenomena were monitored: wear, friction and oil passage rate (correlated with engine’s oil consumption). The first one was studied experimentally while the other two were simulated. Only the interactions with the twin land oil control ring were simulated as it has the greatest influence on the control of friction and oil consumption of all other rings. In the mid-stroke region of truck engine liners, the presence of axial wear scratches was observed and their relation with the removal of the cold worked material (“Blechmantel”) folded inside the deep honing grooves was investigated. Algorithms were developed for estimating the extent of Blechmantel, revealing that most of it remained on the surface whereas the engines still performed well. Other algorithms for characterising honing angle, balance of honing texture, width, height, distance between honing grooves/axial wear scratches, etc were developed for quicker and more objective inspection of unworn and worn surfaces from 3D interference measurements. Based on such 3D measurements, the algorithms were incorporated in a characterisation tool enabling rating of the surfaces and determining the number of measurements necessary to achieve stable roughness parameter values. In addition, it was found that interference measurements are more suitable for quantification of the deposits on the worn truck liner surfaces compared with scanning electron microscope measurements. The lubrication and friction of flat oil control ring lands and differently slide honed surfaces of truck liners were simulated. Friction mean effective pressure and oil passage rate were calculated for each surface showing in each case a reduction for the surfaces with smoother plateaus and smaller valleys. Such a liner surface was finished by using a low base honing pressure and a longer plateau honing time. In a car engine, the influence of different liner surfaces, ring land widths and tensions was examined by running simulations. The results suggest that a considerably improved function can be achieved if the ring land width and tension are reduced whereby the differences between the liner surfaces would reduce.

  • 36.
    Dimkovski, Zlate
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Anderberg, Cecilia
    Volvo Power Train Corp., Volvo Group, Göteborg, Sweden.
    Cabanettes, Frédéric
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Löfgren, Hans
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Rosén, B.-G.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Influence of Different Cylinder Liner Surfaces on Their Performance with the Twin Land Oil Control Ring in a Car Engine2011In: Proceedings of the 13th International Conference on Metrology and Properties of Engineering Surfaces, 2011Conference paper (Refereed)
  • 37.
    Dimkovski, Zlate
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Anderberg, Cecilia
    Volvo Car Corporation, Göteborg, Sweden.
    Ohlsson, Robert
    Volvo Power Train Corp., Volvo Group, Göteborg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Complementing 3D Roughness Parameters for Monitoring of Improved Honing of Cylinder Bores2008In: Proceedings of the Swedish Production Symposium (SPS) - 2008, 2008Conference paper (Refereed)
    Abstract [en]

    It is of common interest to reduce the oil consumption and frictional losses in the internal combustion engines which are in a great deal influenced by the quality of the cylinder liner surface. Its criss-cross patterned topography consists of a communicating system of grooves of different density, width, and depth, somewhere covered by folded metal, and somewhere totally interrupted and unbalanced as a result of the honing process imperfections. These features are crucial for a good liner’s function and are inspected from scanning electron microscope images by experts, which is subjective and time consuming process. Today, a fast automatic quality control is possible by using optical instruments to measure the liner’s topography, and a computer to calculate and check if the standard roughness and groove parameters are in tolerance. Therefore, combining the profile and image analysis, algorithms were developed to compute liner’s groove parameters from 3D interference measurements taken from three different types of cylinder bore surfaces of passenger cars. One of the surface types was a result of a test of an improved honing and the other two being currently in use. Then, the standard and new parameters (groove interruption, number of grooves, holes, etc) were incorporated in a characterisation tool to objectively and quickly evaluate the improvement of the liner’s quality for an updated monitoring in production.

  • 38.
    Dimkovski, Zlate
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Anderberg, Cecilia
    Volvo Car Corporation, Göteborg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Ohlsson, Robert
    Volvo Power Train Corp., Volvo Group, Göteborg, Sweden.
    Thomas, Tom
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Quantification of the cold worked material inside the deep honing grooves on cylinder liner surfaces and its effect on wear2009In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 267, no 12, p. 2235-2242Article in journal (Refereed)
    Abstract [en]

    The increased presence of cold work material on cylinder liners due to the introduction of the diamond honing is undesirable as it seals the oil-bearing honing grooves. The most of it is a smeared metal inside the deep honing grooves (blechmantel) that may break and act as abrasive wear particles increasing the bore wear. An attempt has been made to estimate the extent of removal of blechmantel for different wear regimes present at the middle and top region (near the top dead centre) of the liner surface using the least worn bottom region as a reference for comparison. A number of truck grey iron cylinder liners were axially sectioned after varying periods of engine running under similar conditions of load, engine speed and lubrication. 3D surface measurements were taken at the three regions and a range of standard parameters was extracted. Combining the profile and image analysis, an algorithm was developed to identify and quantify the blechmantel. The algorithm has successfully identified/quantified the blechmantel and can be used for automatic surface quality and process control. It was found that the amount of the blechmantel in the middle section was approximately the same (though slightly lower) as that in the bottom section, while there was a considerable dislocation and removal of blechmantel in the top section and thereby it represents one of the possible causes for wear. Axial wear scratches of different size and distribution were observed not only through the whole stroke area, but also in the bottom region. All engines and liners performed well throughout the tests, and the observed quantities of blechmantel and axial scratches are acceptable for the time being.

  • 39.
    Dimkovski, Zlate
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Anderberg, Cecilia
    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.
    Ohlsson, Robert
    Volvo Power Train Corp., Volvo Group, Göteborg, Sweden.
    Thomas, Tom R.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Quantification of Blechmantel Effect on Wear of Cylinder Bore Microtopography2008In: Proceedings of the 13th Nordic Symposium on Tribology, Nordtrib 2008, Tampere: Tampere University Press, 2008, p. 13-Conference paper (Refereed)
    Abstract [en]

    The presence of cold work material (blechmantel) smeared out on cylinder liners by faulty honing is undesirable as it seals the oil-bearing honing grooves. It is also believed to correlate with increased bore wear, presumably due to its loosening and together with the carbon build-up from the piston’s top land form an increased quantity of abrasive particles. An attempt has been made to estimate the extent of removal of blechmantel for different wear regimes present at the middle and top region (near the top dead centre) of the liner surface using the unworn bottom region as a reference for comparison. A number of truck cylinder liners were axially sectioned after varying periods of engine running under similar conditions of load, engine speed and lubrication. 3D surface measurements were taken at the three regions and a range of standard parameters was extracted. Combining the profile and image analysis, an algorithm was developed to identify and quantify the blechmantel covering the grooves that is most likely to break and act as abrasive wear particles and at the same time it represents the part of blechmantel which covers the most of the surface. It was found out that a mere portion of the blechmantel from the middle and bottom section was removed, while the blechmantel from the top section was greatly removed and thereby it represents one of the possible causes for wear. Axial wear scratches more emphasized on the thrust side of the liner were observed not only through the whole stroke area, but also in the bottom region. The fact that the most of the blechmantel is not removed from the running surface of the liner (except for the very small portion of the polished areas at the dead centres), points out that the blechmantel plays only a minor role on wear of the cylinder liner surfaces.

  • 40.
    Dimkovski, Zlate
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Anderberg, Cecilia
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Strömstedt, Fredrik
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Johansson, Staffan
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Ohlsson, Robert
    Volvo Powertrain AB.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Towards 3D Characterisation of Cylinder Liner Surfaces2008In: Proceedings / XII. International Colloquium on Surfaces January 28th and 29th, 2008, Chemnitz, Germany = XII. Internationales Oberflächenkolloquium / [ed] Michael Dietzsch, Aachen: Shaker Verlag, 2008, p. 15-24Conference paper (Refereed)
    Abstract [en]

    Cylinder liner surface has a direct impact on the oil consumption and frictional losses in the internal combustion engines which are in common interest to be as lower as possible. Thus, the optimisation of the liner surface, its function and manufacture is often on the agenda of the automotive industry. Since the liner surface finish is a subject of improving, there is a need of improving and facilitating of its 3D characterisation preliminary when the parameter control limits are unknown, as well as later when it is experimentally verified and the limits are better determined. For that purpose a method for quality control in 3D of cylinder liners is proposed here. A tool was developed and implemented for rating of cylinder liner surfaces, computing of 3D groove parameters (groove width, height and distance between grooves) and determination of a needed number of measurements.

  • 41.
    Dimkovski, Zlate
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Cabanettes, Frédéric
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Löfgren, Hans
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Anderberg, Cecilia
    Volvo Cars.
    Ohlsson, Robert
    Volvo Powertrain.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Optimisation of Cylinder Liner Surface Finish by Slide Honing2012In: Proceedings of the Institution of mechanical engineers. Part B, journal of engineering manufacture, ISSN 0954-4054, E-ISSN 2041-2975, Vol. 226, no 4, p. 575-584Article in journal (Refereed)
    Abstract [en]

    Cylinder liner surface finish controls the frictional losses, oil consumption, and emissions of internal combustion engines to a large extent. In order to minimize such losses, it is important to optimize the liner surface topography by a consistent and more productive finishing process such as slide honing. This process employs diamond abrasives and has been recently introduced in the automotive industry. In this study, its potentials are explored, especially the winning combination of its key process parameters: the base honing pressure and plateau honing time that would yield an optimal liner surface finish. A number of truck engine liners were slide-honed by using different process parameters, samples of the liners were cut, and three-dimensional (3D) surface measurements were taken on a white light interferometer. Then, among others, the (deep honing) groove parameters, specific for liner surfaces, were computed from the measurements for building a large database for comparison and correlation. By simulating the contact and fluid mechanics between the measured liner topographies and a twin land oil control ring under mixed lubrication conditions, the friction mean effective pressure and oil passage rate for a range of engine speeds were calculated. These two parameters represent the liner's function associated with the engine's friction and oil consumption respectively. The results show that the lowest friction and oil flow are highly correlated with surfaces having smoother plateaus and smaller valleys, finished by using lower base honing pressure and longer plateau honing time. High correlations between the 3D roughness parameters were also found, enabling the selection and use of more stable and robust parameters in the quality control of the liner's surface finish. © IMechE 2012.

  • 42.
    Dizdar, Senad
    et al.
    Halmstad University, School of Business, Innovation and Sustainability.
    Vedantha Krishna, Amogh
    Halmstad University, School of Business, Innovation and Sustainability.
    Microstructural and Mechanical Properties of Polylactic Acid /Tin Bronze Tensile Strength Bars Additive Manufactured by Fused Deposition Modelling2022In: Advances in Transdisciplinary Engineering / [ed] Amos H.C. Ng, Anna Syberfeldt, Dan Högberg, Magnus Holm, Amsterdam: IOS Press, 2022, Vol. 21, p. 566-579Conference paper (Refereed)
    Abstract [en]

    Tensile stress bar samples have been additive manufactured by fused deposition modelling (FDM) route by using polylactic acid (PLA)/tin bronze filament, thermal de-binding and air sintering. The samples reach sintered density of 7.42 g/cm3 or 85% of the relative density of the continuously casted CuSn10 reference. Tensile stress testing of the samples shows rather moderate mechanical properties, about half yield strength and one third maximal strength, elongation and hardness of the reference. Increase in the sample core density and elimination of large, agglomerated pores may result in largest improvement of the mechanical properties.

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  • 43.
    Engkvist, Gustav
    et al.
    Halmstad University.
    Hansson, Sebastian
    Halmstad University.
    FE-modellering av hjullast på sandwichpanel2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor thesis in mechanical engineering was performed during the spring2015 in collaboration with Composite Consulting Group in Laholm. TheComposites Consulting Group works mainly with design and details of differentcomposite projects, their main area is FE-calculations, 3D-modelling andmechanical tests with composite materials.The aim of this bachelor thesis was to simplify the calculation process of solidmechanics for sandwich panels by simulation with computer software. The goalwas to decrease the time for the design and calculation process of the constructionand the cost of the practical tests. Our task was to build a static three dimensionalmodel with the computer software Abaqus, where the result should correspondwith the practical pressure tests in laboratory.The project started with collection of material data from Composites ConsultingGroup and by learning the software Abaqus, simultaneously a specification wasdeveloped in corporation with the company. Later on, a static wheel pressuremodel in the software Abaqus was produced which simulated the behavior of thesandwich panel during static wheel-pressure by a pallet truck. The results from thewheel-pressure model were verified with the practical tests.The project led to a static three dimensional wheel- contact model with thesoftware Abaqus to calculate complex wheel-contact problems on sandwichpanels. The wheel-contact model corresponded to the practical test results. Thecontact model with Abaqus enabled faster and more efficient design anddevelopment process of new sandwich panels. It also provided better analysis ofthe sandwich panels’ behavior during wheel- contact loading.

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  • 44.
    Eriksson, Carl-Johan
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Erlingsson, Jonas
    Halmstad University, School of Business, Engineering and Science.
    FRP i brokonstruktion: -varför används FRP inte i Sverige2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    FRP stands for Fiber Reinforced Polymer. FRP materials have yet to be introduced inbridge construction in Sweden. Composite materials can through combined componentsand manufacturing processes be tailored to fit advanced bridge designs. FRP materials arestrong, durable and of low weight. FRP materials give the superstructure reduced weightand are therefore a suitable alternative for industrial prefabrication. This report shows thatFRP materials are possible to use in bridge construction. With the introduction of a specificEurocode we are confident that FRP materials will become a competitive alternative inbridge construction in Sweden in the future.

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  • 45. Flys, Olena
    et al.
    Berglund, J.
    RISE Research Institutes of Sweden, Borås, Sweden | Department of Industrial and Materials Science, Chalmers University of Technology, Gothenburg, Sweden.
    Rosén, Bengt Göran
    Halmstad University, School of Business, Innovation and Sustainability, The Rydberg Laboratory for Applied Sciences (RLAS).
    Using confocal fusion for measurement of metal AM surface texture2020In: Surface Topography: Metrology and Properties, ISSN 2051-672X, Vol. 8, no 2, article id 024003Article in journal (Refereed)
    Abstract [en]

    The highly complex nature of as printed metal AM surfaces pose other challenges for making measurements compared to surfaces made with many conventional processing methods. The high complexity is caused by high aspect ratios, a mix of high and low reflexivity, steep angles etc. It is not clear which method is the most suitable for measuring these surfaces. The objective of this study was to compare four different measurement modes available in one instrument to evaluate the advantages and drawbacks of the respective techniques regarding measurements of metal AM surfaces. The evaluated measurement modes are Confocal Microscopy, Coherence Scanning Interferometry, Focus Variation and Confocal Fusion. The effect of advantages and drawbacks of studied techniques was tested on typical surfaces produced by L-PBF process. Surfaces printed at 0° and 90° inclinations were compared regarding the measurement results achieved from the different methods. The Power Spectral Density analysis and visual comparison were used for the examination of studied measurements methods. Besides the comparison of areal measurements acquired by different modes available in the instrument also extracted profile measurements were compared with profile images acquired using an Optical Microscope. This study reveals that confocal fusion is a promising technique for AM surface characterisation, due to the highest amount of valid data points in the typical measurement. The new approach developed in the study showed that PSD analysis can be used for evaluation of fill in algorithms incorporated in different software. Results of the profile comparisons help to illustrate features that can be depicted by surface measurements, applying different measurement principles, as well as enables comparison of raw profile data between different types of measurements. Further investigation of measurements on AM surfaces in the frequency domain will bring more understanding about the limitations of measurement techniques. © 2020 IOP Publishing Ltd.

  • 46.
    Flys, Olena
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Dimkovski, Zlate
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Olsson, Bengt
    Volvo Group Truck Technology, Gothenburg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Bååth, Lars
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Piston ring topography variation and robust characterization2014Conference paper (Refereed)
    Abstract [en]

    It is a constant challenge for the automotive industry to reduce friction losses and oil consumption in automobile engine. The piston ring friction accounts for approximately 20% of the total mechanical energy losses in a modern engine. Oil control rings limit and control the oil consumption of the engine as well. They scrape off excess lubricating oil from the cylinder walls and return it to the crank case. Piston rings are designed to distribute the thin oil film evenly to ensure piston and ring lubrication. The surface topography of a piston ring is an efficient variable in the control of the oil consumption and friction losses. In places where the interacting surfaces come in contact, the oil film thickness is extremely thin and the surface asperities may deform because of the high pressures. There are different types of oil control rings.The most common one is the twin land oil control ring, which consists of two narrow lands that scrape off the oil on the liner and a spring on the back that exerts the load. In this paper, the surfaces of the two lands were investigated, since they play the key role in its function. The goal is to map the variation in surface roughness of piston rings that appear at different scales from form and waviness to micro and nano roughness. Areal topography measurements were made by white light interferometer designed at the Halmstad University able to measure and scan the total functional area of a piston ring. An significant amount of oil control piston rings of heavy duty truck engines were examined and 24 measurements were made in circumferential direction and on each ring land. The results show both the variation and uncertainty of the ring topography and discuss the instrument and measuring methodology uncertainty. The most stable parameters were found and recommended for an effective quality control. Comparisons between established coherence scanning interferometer and the instrument built in Halmstad were made. To ensure a good quality, the measurements were made both on calibration standards and on piston ring surfaces. Finally the influence on function and energy losses in the final engine assembly is discussed to indicate future design and metrology improvements.  

  • 47.
    Flys, Olena
    et al.
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS). RISE Research Institutes of Sweden, Borås, Sweden.
    Jarlemark, Per
    RISE Research Institutes of Sweden, Borås, Sweden.
    Petronis, Sarunas
    RISE Research Institutes of Sweden, Borås, Sweden.
    Patrik, Stenlund
    RISE Research Institutes of Sweden, Borås, Sweden.
    Rosén, Bengt Göran
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Applicability of characterization techniques on fine scale surfaces2018In: Surface Topography: Metrology and Properties, ISSN 2051-672X, Vol. 6, no 3, article id 034015Article in journal (Refereed)
    Abstract [en]

    In this study, several surface topographies typical for dental implants were evaluated by different measurement techniques. The samples were prepared by machine turning, wet chemical etching and electrochemical polishing of titanium discs. The measurement techniques included an atomic force microscope (AFM), coherence scanning interferometer (CSI) and a 3D stereo scanning electron microscope (SEM). The aim was to demonstrate and discuss similarities and differences in the results provided by these techniques when analyzing submicron surface topographies. The estimated surface roughness parameters were not directly comparable since the techniques had different surface spatial wavelength band limits. However, the comparison was made possible by applying a 2D power spectral density (PSD) function. Furthermore, to simplify the comparison, all measurements were characterized using the ISO 25178 standard parameters. Additionally, a Fourier transform was applied to calculate the instrument transfer function in order to investigate the behavior of CSI at different wavelength ranges. The study showed that 3D stereo SEM results agreed well with AFM measurements for the studied surfaces. Analyzed surface parameter values were in general higher when measured by CSI in comparison to both AFM and 3D stereo SEM results. In addition, the PSD analysis showed a higher power spectrum density in the lower frequency range 10−2–10−1 µm−1 for the CSI compared with the other techniques. © 2018 IOP Publishing Ltd

  • 48.
    Friel, R. J.
    Loughborough University, Loughborough, United Kingdom.
    13 - Power ultrasonics for additive manufacturing and consolidating of materials2015In: Power Ultrasonics: Applications of High-Intensity Ultrasound / [ed] Gallego-Juarez, Juan A. & Graff, Karl F., Oxford: Woodhead Publishing Limited, 2015, p. 313-335Chapter in book (Other academic)
    Abstract [en]

    This chapter explores the ultrasonic additive manufacturing (UAM) advanced solid-state metal additive/subtractive manufacturing process that combines ultrasonic welding and computer numerical control milling to fabricate solid metal components, layer-by-layer, from metal foils. The chapter will discuss the three key abilities of UAM: complicated geometries, dissimilar material bonding, and object embedment. The combination of these three key abilities places UAM as a most attractive method with which to create metal matrix-based freeform smart structures for high-value engineering applications. © 2015 Elsevier Ltd. All rights reserved.

  • 49.
    Friel, R. J.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Metal Sheet Lamination – Ultrasonic2021In: Reference Module in Materials Science and Materials Engineering / [ed] Hashmi, Saleem, Elsevier, 2021Chapter in book (Refereed)
    Abstract [en]

    Ultrasonic Additive Manufacturing (UAM) is a solid-state metal additive manufacturing process that uses periodic CNC machining to create internal and external geometries, layer-by-layer. The solid-state nature of the bonding process (ultrasonic metal welding) allows UAM to directly bond metal materials with significantly different thermal, hardness and strength properties – permitting unique multi-metal structures. Additionally, the ultrasonic bonding process results in a high-plasticity, low-bulk-temperature phenomenon that permits the embedding of sensitive elements such as optical fibers, electronics and reinforcement elements, directly into metal matrices. Due to these novel capabilities, UAM holds a position of uniqueness in Advanced Manufacturing processes.

  • 50.
    Friel, R. J.
    et al.
    The Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire, United Kingdom.
    Harris, R. A.
    The Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire, United Kingdom.
    Ultrasonic additive manufacturing – A hybrid production process for novel functional products2013In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 6, p. 35-40Article in journal (Refereed)
    Abstract [en]

    Ultrasonic Additive Manufacturing (UAM), or Ultrasonic Consolidation as it is also referred, is a hybrid form of manufacture, primarily for metal components. The unique nature of the process permits extremely novel functionality to be realised such as multi-material structures with embedded componentry. UAM has been subject to research and investigation at Loughborough University since 2001. This paper introduces UAM then details a number of key findings in a number of areas that have been of particular focus at Loughborough in recent years. These include; the influence of pre-process material texture on interlaminar bonding, secure fibre positioning through laser machined channels, and freeform electrical circuitry integration. © 2013 The Authors.

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