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  • 1.
    Anderberg, Cecilia
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Cabanettes, Frederic
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Dimkovski, Zlate
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Ohlsson, Robert
    Rosen, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Combined SEM and Stylus Profiling Sensoring for Improved Cylinder Liner Honing2006Ingår i: Proceedings of Austrib 06 - International Tribology Conference, Brisbane: Queensland University of Technology , 2006, s. 6-Konferensbidrag (Refereegranskat)
    Abstract [en]

    The demands on decreased environmental impact from vehicles are resulting in a strong push for decreased engine oil and fuel consumption.

    Recent engine tests have shown a promising reduction in oil consumption when using cylinder liners with a smoother finish than the current plateau honing.

    One approach to produce smoother liner surfaces is to replace SiC ceramic honing stones with diamond tools. However, even though the diamond honing process results in higher productivity, improved quality control is needed to monitor the degree of cold worked material - “blechmantel” (German), and the resulting risk of increased wear and scuffing.

    A number of petrol and diesel engine cylinder liners have been mapped to be able to verify the quality and consequences, in terms of wear and function, of the honing process. A new mapping method, combining SEM images and quantitative image analysis with traditional 2D profilometry has been developed and tested in this study. The surface mapping method developed was employed before and after the test to study effect of running-in wear on the surface, features characterized with the SEM- and the 2D profilometer.

    The results show that combining SEM- and profilometric methods gives a good picture of the effects of varying the cylinder liner pressure and roughness. The core roughness decreases more for diesel liners than for petrol liners.. A probable cause is that the more severe diesel high pressure run-in conditions are able to effectively “truncate” the plateaux and remove residing plastically deformed un-cut honing residues while the less severe petrol liner conditions do not manage to remove the blechmantel and irregularities to an important extent.

  • 2.
    Anderberg, Cecilia
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Cabanettes, Frederic
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Dimkovski, Zlate
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Ohlsson, Robert
    Volvo Power Train Corp., Volvo Group, Göteborg, Sweden.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Cylinder Liners and Consequences of Improved Honing2006Konferensbidrag (Refereegranskat)
    Abstract [en]

    The demands on decreased environmental impact from vehicles are resulting in a strong push for decreased engine oil and fuel consumption. Engine oil and fuel consumption are to a great extent controlled by the topography of the cylinder liner surface.

    Recent engine tests have shown a promising reduction in oil consumption when using cylinder liners with a smoother finish than the current plateau honing.

    One approach to produce smoother liner surfaces is to replace SiC ceramic honing stones with diamond tools. However, event though the diamond honing process results in higher productivity, improved demands of quality control is needed to monitor the degree of cold worked material - “blechmantel” (German), and the resulting risk of increased wear and scuffing.

    A number of petrol and diesel engine cylinder liners have been mapped to be able to verify the quality and consequences, in terms of wear and function, of the honing process. A new mapping method, combining SEM images and quantitative image analysis with traditional 2D profilometry has been developed and tested in this study. The liners where tested in a reciprocating rig of 8 mm stroke and with a frequency of 10 Hz, simulating the top-dead center conditions in a running engine.

    The tests where carried out in high- and low pressure conditions with smooth respectively rough liner roughnesses against PVD coated piston rings. The developed surface mapping method was employed before and after the test to study effect of running-in wear on the surface, features characterized with the SEM- and the 2D profilometer.

    The results show that combining SEM- and profilometric methods gives a good picture of the effects of varying the cylinder liner pressure and roughness. The core roughness decrease more for diesel liners than for petrol liners. In average (rough and smooth liners) the diesel core roughness decrease 265% while the petrol liners average on a 60% decrease. Blechmantel- and Irregularities ratio show a high sensitivity to varying conditions and decrease 1180% to 100% for the diesel liners while the parameters increase between 106% to 18% for all the petrol liners. A probable cause is the more severe diesel high pressure run-in conditions are able to effectively “truncate” the plateaux and remove residing plastically deformed un-cut honing residues while the less severe petrol liner conditions not manage to remove the blechmantel and irregularities in an important extent.

  • 3.
    Anderberg, Cecilia
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Cabanettes, Frederic
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Dimkovski, Zlate
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Liner Surface Improvements for Low Friction Piston Ring Packs2009Ingår i: Society of Tribologists and Lubrication Engineers annual meeting & exhibition 2009: Lake Buena Vista, Florida, USA, 17 - 21 May 2009, Red Hook, NY: Curran Associates, Inc., 2009, s. 455-459Konferensbidrag (Refereegranskat)
  • 4.
    Anderberg, Cecilia
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK). Getinge Sterilization AG, Getinge, Sweden.
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt - Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK).
    Liner surface improvements for low friction piston ring packs2014Ingår i: Surface Topography : Metrology and Properties, ISSN 2051-672X, Vol. 2, nr 1, artikel-id 014009Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The development of engine components in the automotive industry is governed by several constraints such as environmental legislation and customer expectations. About a half of the frictional losses in an internal combustion engine come from the interactions between the piston assembly and cylinder liner surface. The tribological considerations in the contact between the piston ring and cylinder liner have attracted much attention over the past few decades. Many non-conventional cylinder liner finishes have been, and are being, developed with the aim to reduce friction losses and oil consumption, but the effects of the surface finish on piston ring pack performance is not well understood. One way of reducing friction in the cylinder system is to reduce the tangential load from the piston ring pack, focusing on the oil control ring. However, the side-effect of this is a disappointingly increased oil consumption. In this study a number of different cylinder liner surface specifications were developed and implemented in test engines with the aim of maintaining the level for oil consumption when decreasing the tangential load for the piston ring pack. To improve our understanding of the result, the same surfaces were evaluated in elastic and elasto-plastic rough contact and hydrodynamic flow simulation models. It is shown that oil consumption is strongly related to surface texture on the cylinder liners and at lower speeds (900–1200 rpm), a 'rougher surface' with a high core (e.g. Sk) and valley roughness (e.g. Svk) results in higher oil consumption. At the medium speed range (1200–3600 rpm), oil consumption continues to dominate for the 'rough' surfaces but with a visible influence of a lower oil consumption for a decreased roughness within the 'rough' surface group. 'Smooth' surfaces with a 'smooth' core (Sk), irrespective of the valley component (Svk), show similar oil consumption. For engine speeds above 3600 rpms, an increase in plateau roughness results in higher oil consumption. Throughout the study, standard roughness parameters were computed to compare with the results from engine testing and simulation. Future work will be directed to continuous optimization between oil consumption and friction. Improving the understanding of the functional cylinder system surfaces' ability to form oil films in the cylinder system opens up opportunities, not only in reducing the tangential load of piston ring packs but also in optimizing oil viscosity in order to reduce friction.

  • 5.
    Anderberg, Cecilia
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Pawlus, P.
    Rzeszow University of Technology, Poland.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Thomas, T. R.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Alternative descriptions of roughness for cylinder liner production2009Ingår i: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 209, nr 4, s. 1936-1942Artikel i tidskrift (Refereegranskat)
    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.

  • 6.
    Andersson, Andreas
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Larsson, Linus
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Förbättrad manövrering av lastvagn2013Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Detta examensarbete har gjorts på uppdrag av, och i samarbete med Getinge Sterilization. Syftet med detta projekt har varit att ta fram en lösning som gör vagnarna i SMART-vagnsserien mer lättmanövrerade, då användare idag upplever dessa som svårmanövrerade. Handtaget och vagnens hjulkonfiguration identifierades som de faktorer som främst påverkar vagnarnas manövreringsförmåga. Arbetet riktades därför in på att ta fram ett nytt handtag och en ny hjulkonfiguration som löser manövreringsproblemet. Tillsammans med Getinge togs därefter en kravprofil fram med krav och önskemål för de nya lösningarna.

    I ett första skede togs en rad principlösningar fram på tänkbara lösningar till problemet i form av enklare skisser. Detta gjordes utan att ta hänsyn till några krav eller önskemål. Principlösningarna utvärderades därefter mot kraven där de lösningar som inte uppfyllde kraven sållades bort.

    Principlösningarna för handtag som gick vidare från utvärderingen presenterades för Getinge, som valde ut en av lösningarna som de ville ta fram en prototyp på. Det genomfördes därför inga fler utvärderingar på handtagen. Det utvalda handtaget genomgick primärkonstruktionsprocessen och vidareutvecklades i ett antal omgångar för att på bästa sätt uppfylla kraven samt kunna tillverkas i en bockningsmaskin. En prototyp för den slutgiltiga lösningen togs fram.

    Principlösningarna för hjulkonfigurationerna genomgick ytterligare en utvärdering, denna gång mot önskemålen. För de principlösningar som gick vidare från den sista utvärderingen tillverkades prototyper och ett användartest genomfördes för att få fram den slutgiltiga lösningen.

    Resultatet av examensarbetet är en lastvagn med ett extra hjulpar, samt ett nytt, mindre handtag, för att uppfylla projektets syfte.

  • 7.
    Andersson, Christoffer
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Maric, Bojan
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Konstruktion av efterbehandlare2010Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
  • 8.
    Andersson, Marcus
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Tillämpad konstruktion (Digitala verktyg).
    Jönsson, Simon
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Tillämpad konstruktion (Digitala verktyg).
    Konstruktion av kolfiberarmerad motorcykelram2013Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
  • 9.
    Axelsson, Emil
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK).
    Källner, David
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK).
    Plastgranulat Extruder2016Självständigt arbete på grundnivå (högskoleexamen), 5 poäng / 7,5 hpStudentuppsats (Examensarbete)
  • 10.
    Barth, Henrik
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Centrum för innovations-, entreprenörskaps- och lärandeforskning (CIEL).
    Holmén, Magnus
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Centrum för innovations-, entreprenörskaps- och lärandeforskning (CIEL).
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    The use and abuse of 3D-printing from a business model perspective2016Konferensbidrag (Refereegranskat)
    Abstract [en]

    The paper analyses changes in user activities and behaviour across different types of actors following the introduction of 3D printers. 3D printing, or additive manufacturing, has been claimed to disrupt manufacturing, allowing firms to move from prototyping to full-scale end-part production and replacement part production in a one-step process. 3D printing has many different uses, for example, the manufacturing of toys, shoes, lamps and fashion accessories, and by implication many different types of users and buyers. There are few empirical studies on the types of uses and users of 3D, hampering our understanding in what ways the 3D printers may change the behaviour of users, and whether 3D printers affect the likelihood and the nature of entrepreneurship or business model innovation. To investigate this, a model was created based on the 3DP literature. The model is applied on a distributor customer database and four interview-based illustrative case studies. The empirical findings show that the use of 3DP a) lowers the knowledge and resource barriers for experimentation and entrepreneurial entry, b) increases product and concept prototyping in product development, c) provides a potential for business model innovation by expanding the boundaries of the firm upstream and downstream, and d) becomes a ticket for entrepreneurial entry. Based on our results, the paper suggests that the potential of 3D printers alter user innovative activities is high but most of the potential is latent.

  • 11. Bellini, Anna
    et al.
    Gabrielson, Per
    Wiklund, Daniel
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Gunnarsson, L.
    Frictional properties of different austenitic stainless sheet surface topographies: Industrial trials at Alfa Laval2006Konferensbidrag (Refereegranskat)
  • 12.
    Bergkvist, Marcus
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Åkerblom, Christopher
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Shooting Target - Konstruktion: Product Development2014Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The shooting sport is one of the most widespread sports in the world and it is

    being practice in most countries. Based on their own experiences, in competition -

    and hobby shooting, the client M4Solutions found a demand and need for a

    shooting target that is manufactured in Sweden.

    The purpose of the project has been to develop, with the help of Marcus Walldén,

    two shooting targets from idea to finished product. These two shooting targets,

    Plate Rack Target and Dueling Tree, would each be equipped with a mechanical

    resetting system but will in the future have the ability to be provided with an

    electronic resetting system.

    The project from the client was divided into two theses. One of these two, written

    by Marcus Walldén, focused on the tripod parts and the overall design work for

    both Plate Rack Target and Dueling Tree. The thesis that is presented in this

    report have focused on resetting systems, the design of protective plates and other

    peripherals for both shooting targets.

    This work has primarily been in CAD environment where design, construction

    and development has been given free rein. Calculations, test shootings and choice

    of materials has been made in order to reach the best possible solutions. The thesis

    resulted in two complete 3D models and two full-scale prototypes of steel.

  • 13.
    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
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    On discovering relevant scales in surface roughness measurement: an evaluation of a band-pass method2010Ingår i: Scanning, ISSN 0161-0457, E-ISSN 1932-8745, Vol. 32, nr 4, s. 244-249Artikel i tidskrift (Refereegranskat)
    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.

  • 14.
    Berglund, J.
    et al.
    Research Technology Center Die & Mould, Sandvik Tooling Sverige AB, Olofström, Sweden.
    Rosén, Bengt Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    A method development for correlation of surface finish appearance of die surfaces and roughness measurement data2009Ingår i: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 36, nr 2, s. 157-164Artikel i tidskrift (Refereegranskat)
    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.

  • 15.
    Berglund, Johan
    et al.
    Sandvik Tooling.
    Brown, Christopher A.
    Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Bay, Niels
    Department of Mechanical Engineering, Technical University of Denmark, Lyngby, Denmark.
    Milled die steel surface roughness correlation with steel sheet friction2010Ingår i: CIRP annals, ISSN 0007-8506, E-ISSN 1726-0604, Vol. 59, nr 1, s. 577-580Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This work investigates correlations between the surface topography of milled steel dies and friction with steel sheet. Several die surfaces were prepared by milling. Friction was measured in bending under tension testing. Linear regression coefficients (R2) between the friction and texture characterization parameters were tested. None of the height, spacing, material volume, void or segmentation parameters showed good correlations. Developed area, rms surface gradient, relative area and complexity showed strong correlations (R2 > 0.7). For area-scale fractal complexity the correlation increases markedly at scales below 200 μm2, with a maximum R2 of 0.9 at 50 μm2.

  • 16. Berglund, Johan
    et al.
    Jonsson, Per
    Rebeggiani, Sabina
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Measuring strategies for smooth tool steel surfaces2008Ingår i: Proceedings: January 28th and 29th, 2008, Germany, Chemnitz = XII. Internationales Oberflächenkolloquium, Aachen: Shaker Verlag, 2008, s. 110-119Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Comparisons between different measuring strategies were made on three types of smooth tool steel surfaces. Three replica materials were tested to study possibilities within replication techniques. An optical interferometer as well as a mechanical stylus was used to evaluate the surfaces. The results showed that the tested replica materials generated good representations of both the form and the surface roughness (Sq > 300 nm). The evaluated surfaces were quite homogeneous, thus, few measurements are needed to get representative results. However, it was found that caution must be taken regarding manually polished surfaces which can be less homogenous and therefore require more measurements to get representative results.

  • 17.
    Berglund, Johan
    et al.
    Sandvik Tooling, R & D Center Olofström, Sweden.
    Liljengren, Magnus
    Olofström School of Automotive Stamping, Olofström, Sweden.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    On finishing of pressing die surfaces using machine hammer peening2011Ingår i: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 52, nr 1-4, s. 115-121Artikel i tidskrift (Refereegranskat)
    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.

  • 18. Berglund, Johan
    et al.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Robust and Easy to Use Quality Control of Roughness on Milled Tool Steel Surfaces2008Ingår i: 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, s. 284-289Konferensbidrag (Refereegranskat)
    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.

  • 19.
    Berglund, Johan
    et al.
    Institutionen för material- och tillverkningsteknik, Tillverkningsteknik, Chalmers tekniska högskola .
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Surface Finish and Roughness Measurement in Die and Mould Manufacturing2008Ingår i: Proceedings of the 2'nd Swedish Production Symposium, 2008, s. 385-391Konferensbidrag (Refereegranskat)
    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.

  • 20.
    Berglund, Johan
    et al.
    Advanced Engineering, Sandvik Tooling, Olofström, Sweden.
    Wiklund, Daniel
    Forming Processes, Swerea IVF, Mölndal, Sweden.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    A Method for Visualization of Surface Texture Anisotropy in Different Scales of Observation2011Ingår i: Scanning, ISSN 0161-0457, E-ISSN 1932-8745, Vol. 33, nr 5, s. 325-331Artikel i tidskrift (Refereegranskat)
    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.

  • 21.
    Bergman, Martin
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Eriksson, Lars
    Mechanical Engineering Industrial Design, Jönköping University, Jönköping, Sweden.
    Surface appearance and impression2012Ingår i: KEER 2012: Proceedings of the International Conference on Kansei Engineering and Emotion Research, KEER 2012 / [ed] Feng-Tyan Lin Ph.D., Tainan: Department of Industrial Design, National Cheng Kung University , 2012Konferensbidrag (Refereegranskat)
  • 22.
    Bergman, Martin
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK).
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK).
    Eriksson, Lars
    Jönköping University, Jönköping, Sweden .
    Anderberg, Cecilia
    Getinge Infection Control AB, Research & Development Department, Sweden.
    Surface design methodology: challenge the steel2013Ingår i: Metrology and Properties of Engineering Surfaces, 2013: Proceedings of the 14th International Conference, Taipei, Taiwan, June 17-21, 2013, Bristol, UK: Institute of Physics Publishing (IOPP), 2013, s. 192-199Konferensbidrag (Refereegranskat)
    Abstract [en]

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

  • 23.
    Blunt, Liam
    et al.
    University of Huddersfield, UK.
    Rosén, Bengt-GöranHögskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.Thomas, TomJiang, XiangqianWhitehouse, David
    Proceedings of the 11th International Conference on Metrology and Properties of Engineering Surfaces: July 17th - 20th 2007, Huddersfield, UK2007Proceedings (redaktörskap) (Refereegranskat)
  • 24.
    Bolmsjö, Gunnar
    et al.
    Division of Machine Design, Department of Design Sciences LTH Lund University, Lund, Sweden.
    Petersson, Håkan
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Tillämpad konstruktion (Digitala verktyg). Division of Machine Design, Department of Design Sciences LTH Lund University, Lund, Sweden.
    Bjärnemo, Robert
    Division of Machine Design, Department of Design Sciences LTH Lund University, Lund, Sweden.
    Robot assisted framing: A concept for securing geometry in flexible production2008Rapport (Refereegranskat)
    Abstract [en]

    The paper describes a concept for securing the geometry in flexible production based on robot assisted framing. This uses the robot(s) as an active device during change-over between product variants and it is assumed that product variants can be produced in any mixed order. The case under study is cabs for trucks which in traditional production require large and heavy equipment which is above the payload of any robot. The idea within this study is to use carbon fibre composites in the fixtures in order to reduce the weight and through this make it possible to use the robots in assisting the framing process. The current work involves a generalization of the principle both considering the design of the fixtures with respect to issues such as materials properties and design principles, and design of the production system.

     

  • 25.
    Bryngelv, Sebastian
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK).
    Stång-Magasin till Industrirobot2016Självständigt arbete på grundnivå (högskoleexamen), 5 poäng / 7,5 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    I den här rapporten går vi igenom processen som vi har använt oss av för att ta fram en konceptmodell för ett nytt magasin åt InLead då de planerar att expandera sitt sortiment för att nå en bredare kundkrets. För tillfället har InLead ett magasin för kutsar och det magasinet vi har fått i projekt att ta fram är ett stångmagasin.

    I samarbete med vår handledare på InLead har vi gått igenom vad de vill ha i form av  funktioner och utseénde. Under projektet använde vi det arbetssätt som är baserat på Freddy Olssons metod, princip och primärkonstruktion (1995), som vi använt oss av i tidigare kurser. Under projektets gång så var vi även på besök i InLeads lokal där vi fick se deras nuvarande magasin samt roboten som de kommer använda sig av för att få en bättre inblick i vad projektet ska bli i sitt slutliga stadie. Vi har lagt ner mycket tid på att få fram de resultat som gav den enklaste lösningen för montering och programmering av roboten. Vi kommer att sätta upp ett poängsystem som baseras på våra krav och önskemmål, där väger vi våra produktförslag och väljer det som passar bäst, vi kommer även göra en POME-Matris.

    Produkten är uppritad i catia v5 där vi baserade våra idéer på .STEP filer försedda av företaget. Vi använde oss primärt av Part Design och Assembly design då de arbetsbänkarna som används passade vårt projekt bäst. Vi har även använt oss av Catia Photo Studio, Keyshot för att ta fram renderade bilder och animationer av det slutliga resultatet.

  • 26.
    Bååth, Lars
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    A method for measuring temperature, molecular composition or molecular densities in gases1994Patent (Övrig (populärvetenskap, debatt, mm))
  • 27.
    Bååth, Lars
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    A method for simultaneously measuring the positions of more than one surface in metallurgic processes1994Patent (Övrig (populärvetenskap, debatt, mm))
  • 28.
    Bååth, Lars
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    A method to simultaneously measuring the position of more than one surface in metallurgical processes1997Patent (Övrig (populärvetenskap, debatt, mm))
    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.

  • 29.
    Bååth, Lars
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Fotonik.
    Functional surfaces2012Konferensbidrag (Övrigt vetenskapligt)
  • 30.
    Bååth, Lars
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Functional surfaces2011Konferensbidrag (Övrigt vetenskapligt)
  • 31.
    Bååth, Lars
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Fotonik.
    Fundamentals of Optical Measurement Systems: Part 1 - Fundamental of Optics2012Konferensbidrag (Övrigt vetenskapligt)
  • 32.
    Bååth, Lars
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Fotonik.
    Fundamentals of Optical Measurement Systems: Part 2 - Measurement Systems2012Konferensbidrag (Övrigt vetenskapligt)
  • 33.
    Bååth, Lars
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Mathod for measuring temperature, molecular composition or molecular densities in gases2001Patent (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    A measuring technique and method are provided to simultaneously determine the molecular density of several molecular species and the temperature within a closed process room in a melting or combustion process. In such processes in the industry, e.g. in metallurgic process industry, it is important to determine the temperature and the contents within the gas or flame without physically connect to or disturb the process. This has shown to raise large problems especially at high temperatures. The radio signal over a frequency band is measured on the outside of the process room through a window in the mantel covering as a function of frequency and registered on a computer as a radio spectrum. The system is calibrated by using a known signal transmitted through the process room. The spectral lines are identified by their frequency from a database. The temperature is determined from several lines of the same molecular specie and the molecular densities are determined from the intensities of the lines. The method is suitable to determine vibrational and rotational excitation of molecular species in the radio wavelength range of 30 micrometers to 500 meters. The densities of molecular species and the temperature can be imaged in three dimensions inside the process room or exhaust channel if interferometers are used for simultaneous two dimensional imaging from several azimuth directions.

  • 34.
    Bååth, Lars
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Fotonik och mikrovågsteknik.
    Method and device for contact level and interface detection2009Patent (Övrig (populärvetenskap, debatt, mm))
  • 35.
    Bååth, Lars
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Fotonik och mikrovågsteknik.
    Method for analysing a substance in a container2008Patent (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    Method and apparatus for analysing a substance in a container, the method comprising the steps of: disposing antenna means (3) at a predetermined geometrical distance (L) from a container portion (13); transmitting a signal from said antenna means through a surface portion (12) of the substance towards said container portion; receiving a first reflected signal in said antenna means from said container portion; determining a geometrical distance (L 1 ) from the surface portion to the container portion; varying the frequency of the transmitted signal to determine a first phase displacement between the transmitted signal and the first reflected signal; determining an optical distance from the surface portion to the container portion based on the first phase displacement; and determining the index of refraction (n 1 ) of said substance based on the optical and geometrical from the surface portion to the container portion.

  • 36.
    Bååth, Lars
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Method for measuring molecular composition or molecular densities in gases2000Patent (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    A measuring technique and method are provided to simultaneously determine the molecular density of several molecular species and the temperature within a closed process room in a melting or combustion process. In such processes in the industry, e.g. in metallurgic process industry, it is important to determine the temperature and the contents within the gas or flame without physically connect to or disturb the process. This has shown to raise large problems especially at high temperatures. The radio signal over a frequency band is measured on the outside of the process room through a window in the mantel covering as a function of frequency and registered on a computer as a radio spectrum. The system is calibrated by using a known signal transmitted through the process room. The spectral lines are identified by their frequency from a database. The temperature is determined from several lines of the same molecular specie and the molecular densities are determined from the intensities of the lines. The method is suitable to determine vibrational and rotational excitation of molecular species in the radio wavelength range of 30.mu.m to 500 m. The densities of molecular species and the temperature can be imaged in three dimensions inside the process room or exhaust channel if interferometers are used for simultaneous two dimensional imaging from several azimuth directions.

  • 37.
    Bååth, Lars
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Method for measuring temperature of at least one of gas and a flame in a combustion process1998Patent (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    A measuring technique and method are provided to simultaneously determine the molecular density of several molecular species and the temperature within a closed process room in a melting or combustion process. In such processes in the industry, e.g. in metallurgic process industry, it is important to determine the temperature and the contents within the gas or flame without physically connect to or disturb the process. This has shown to raise large problems especially at high temperatures. The radio signal over a frequency band is measured on the outside of the process room through a window in the mantel covering as a function of frequency and registered on a computer as a radio spectrum. The system is calibrated by using a known signal transmitted through the process room. The spectral lines are identified by their frequency from a database. The temperature is determined from several lines of the same molecular specie and the molecular densities are determined from the intensities of the lines. The method is suitable to determine vibrational and rotational excitation of molecular species in the radio wavelength range of 500 m et 30 m. The densities of molecular species and the temperature can be imaged in three dimensions inside the process room or exhaust channel if interferometers are used for simultaneous two dimensional imaging from several azimuth directions.

  • 38.
    Bååth, Lars
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Multi-dimensional imaging method and apparatus2007Patent (Övrig (populärvetenskap, debatt, mm))
  • 39.
    Bååth, Lars
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Fotonik.
    Noise Spectra from Wind Turbines2013Ingår i: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 57, s. 512-519Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents observations of audio noise in frequency range 20e20 000 Hz from wind turbines. The observations were performed around the theoretically calculated 40 dBA noise perimeter around the wind turbine farm at Oxhult, Sweden. This paper describes a newly designed and constructed a field qualified data acquisition system to measure spectra and total noise level of sound from wind turbines. The system has been calibrated at SP Borås. It is shown that it has a flat frequency response and is linear with amplitude and time.

    The total noise level (as integrated 20e20 000 Hz) is shown to be below 35 dBA (below the reference background noise at 36 dBA) at a 10 m altitude wind speed of 4e5 m/s. The measurements were made along the theoretical 40 dBA border at 8 m/s.

    It is concluded that the theoretical 40 dBA border seems reasonable calculated if the manufacturer specifications are used to extrapolate the sound level to correspond to 8 m/s at 10 m. Our data indicate that a simple sound propagation model is sufficient since the sound level is more affected by the nearby environment than the large scale forest structure. Also, the large scale forestry structure is bound to change with time and the error bars of measurements on total sound level are about 1 dBA, which is larger than any fine tuning with a more sophisticated model. More care should be taken to model the reflections from walls and other obstacles close to the microphones.

    The distribution of the spectral noise level around the turbine farm suggests that the noise originates from individual wind turbines closest to the measurement location rather than from the wind turbine farm as a whole. The spectra show narrow band spectral line features which do not contribute signifi-cantly to the total noise at this level. The narrow band features are only detectable at very long inte-gration time and at 1 Hz spectral resolution. The spectral features are typical to originate from mechanical noise.

    The spectral acquisition method described in this paper can be used as a field qualified system for sound measurements in forest areas. The high spectral resolution is a viable remote diagnostic method for mechanical faults in the turbine machinery. Future work will concentrate on these two areas.

  • 40.
    Bååth, Lars
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Fotonik och mikrovågsteknik.
    Position measuring system2003Patent (Övrig (populärvetenskap, debatt, mm))
  • 41.
    Bååth, Lars
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK).
    To See What You Cannot See2003Ingår i: Image Analysis: 13th Scandinavian Conference, SCIA 2003, Halmstad, Sweden, June 29 - July 2, 2003, Proceeding / [ed] Josef Bigun, Tomas Gustavsson, Heidelberg: Springer Verlag , 2003, s. 108-108Kapitel i bok, del av antologi (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    This paper discusses imaging with complex data from micro-wave, mm-wave, and optical interferometers. An overview of methods to extract physical parameters as images from interferometer data is made and two- and three-dimensional images of gas flows, quasi-stellar objects, steel melts, and fiber material such as wood are presented.

  • 42.
    Bååth, Lars B.
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Abu Dalou, Sadi Khalid
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Surface topography with PDI holography2008Ingår i: Proceedings of the XII. International Colloquium on Surfaces / [ed] Michael Dietzsch, Aachen: Shaker Verlag, 2008, s. 10-Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    This paper presents topographic measurements of metal surface with Point Diffraction Interferometer (PDI) technique. Interferogram of a surface is created and recorded with different phase offsets. These are then combined to create a phase offset map of the surface. We demonstrate the use with the presentation of our first surface topographic map

  • 43.
    Bååth, Lars B.
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Löfgren, Hans
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Ny teknologi för avisning av vindkraftvingar2008Konferensbidrag (Övrigt vetenskapligt)
  • 44.
    Bååth, Lars
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Fotonik och mikrovågsteknik.
    Löfgren, Hans
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK).
    Ny teknik för avisning av vindkraftsvingar2008Rapport (Övrigt vetenskapligt)
    Abstract [sv]

    Denna rapport presenterar resultatet av en förstudie om tekniker för avisning av vindkraftverk. Rapporten presenterar och diskuterar möjliga metoder och tekniker för att antingen värma vattendroppar till över fryspunkten, eller smälta is som har bildats på vingen. Problematiken för vingar på vindkraftverk skiljer sig markant från nedisning av flygplansvingar i att: (1) vingar på vindkraftverk tillbringar all sin tid i den delen av atmosfären där risken för nedisning är som störst; och (2) hastigheten för vingen mot luft varierar med avstånd från rotationscentrum medan den är konstant över vingen på ett flygplan. Formen på vingen på ett vindkraftverk varierar också från toppen in till centrum för att kompensera för variationen av relativ hastighet mot luften.Rapporten koncentreras på isbildning inom temperaturintervallet -10°C – 0°C och droppstorlekar av 1- 10 μm. Nedisning sker även vid mycket lägre temperaturer, men då sker troligen isbildningen direkt från vattenånga.

    Vi drar följande slutsatser från vår studie:

    • Formen på vingen, speciellt vid kontaktytan mot gasflödet, kan ha betydelse för nedisning.
    • Nano-strukturen av ytan på vingen kan troligen konstrueras så att vattendropparna får enminimal kontaktyta mot vingen.

    Vår förstudie visar dessutom:

    • Mikrovågor är alltför ineffektiva för att värma rent vatten eller smälta is. Tekniker för direktstrålning av mikrovågor mot vatten eller is på vingar bör således inte vidare utvecklas.
    • Millimetervågor är tillräckligt effektiva, men generationen av vågor på så höga frekvenser ärtroligen alltför ineffektiv för att detta ska vara en möjlig väg framåt.
    • Infrarött ljus är mycket effektivt för att värma vattendroppar eller smälta is och bör undersökasvidare.
    • Värmeledning är också effektivt och bör utvecklas. En robust och effektiv metod kan vara attvärma vingytan med mikrovågor så att kontakten mot den varma ytan smälter isen.

    Vår förstudie visar att problematiken med undvikande av isbildning på, eller avisning av, vindkraftsverk inte har sitt svar i en enda teknik. Formen på vingen och strukturen på dess yta kan spela en viktig roll i förhållandena för isbildning. Båda dessa variabler kan behöva varieras beroende på latitud och atmosfäriskt klimat. Ytstrukturen måste troligen också variera över vingytan, både längs med vingen och tvärs, för att optimera för de lokala förhållandena. Dessutom kan smältning av is medelst värmning av vingytan vara en viktig extra möjlighet för att undvika effektförluster.Mer forskning är nödvändig, men vi sammanfattar att det största intresset just nu är att studera flödet av droppar över vingen som funktion av tvärsnittsytans form och kontakten mellan vingytan som funktion av ytstrukturen (t.ex. Lotus effekten).Denna rapport är resultatet av ett förstudieprojekt. Vi ämnar nu fortsätta med ett djupare forskningsprojekt som koncentreras på formen och ytstrukturen enligt vad som framkommit av vår analys och våra datorsimuleringar.

  • 45.
    Bååth, Lars
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Fotonik och mikrovågsteknik.
    Nilsson, Emil
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Method and device for multidimensional imaging2007Patent (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    PROBLEM TO BE SOLVED: To provide a method and system using transmission of an electromagnetic signal in order to determine the positions of reflection points by detecting the signals reflected at the reflection points in space. ; SOLUTION: The present invention provides a method, antenna, and system for defining the positions of the reflection points using microwave. The electromagnetic signal is generated at a determined frequency, and is transmitted by an antenna unit. The antenna unit comprises a transmitting antenna, and many receiving antennas that are separated at a known interval in the direction perpendicular to the main visual axis and are designed to receive a part of the reflected wave of the transmitted wave. A phase comparing means is connected to the transmitting antenna and receiving antennas, and a control unit connected to the phase comparing means can calculate an angle to the reflection points and calculate the distances to the reflection points. ; COPYRIGHT: (C)2007,JPO&INPIT

  • 46.
    Bååth, Lars
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Fotonik och mikrovågsteknik.
    Nilsson, Emil
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Multi-dimensional imaging method and apparatus2007Patent (Övrig (populärvetenskap, debatt, mm))
  • 47.
    Bååth, Lars
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Nilsson, Emil
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Multi-dimensional imaging method and apparatus2007Patent (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    A method, an antenna, and a system for determining positions for reflection points using microwaves. An electromagnetic wave signal is generated at a defined frequency, and transmitted by an antenna unit the antenna unit includes a transmitter antenna and a plurality of receiver antennas, separated by a known spacing perpendicular to a main line of sight and devised to receive reflected portions of the transmitted wave. Phase comparator means are connected to the transmitter antenna and the receiver antennas, and a control unit connected to the phase comparator means is operable to calculate an angle to a reflection point from detected phase difference between at least two receiver antennas and the spacing between said at least two receiver antennas, and to calculate a distance to the reflection point from detected phase difference between the transmitter antenna and a receiver antenna dependent on the frequency.

  • 48.
    Bååth, Lars
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Fotonik.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Towards New Interferometer Technology for Surface Metrology2012Ingår i: Proceedings of the 12th International Conference of the European Society for Precision Engineering and Nanotechnology: June 4th - 7th [8th] 2012, Stockholm, Sweden. Vol. 1 / [ed] P. Shore, H. Spaan & T. Burke, Bedford: EUSPEN , 2012, Vol. 1, s. 158-161Konferensbidrag (Refereegranskat)
    Abstract [en]

    There is an increasing requirement from manufacturing industries for improved technologies to measure surface topography. New instruments have to be accurate; robust to be used on the industry floor; non-invasive; automatic; and sufficiently fast to be used in real time as well as to simultaneously measure over a large area. The industrial applications are plenty:

    • On-line quality control of machined parts,
    • Direct feed back to the manufacturing process,
    • Analysis and selection of surface texture/structure.

    This paper presents new developments in interferometer techniques for new robust area-based topographic instruments.

  • 49.
    Cabanettes, Frederic
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Fahlgren, Lars
    Volvo Car Corporation, Gothenburg, Sweden .
    Hoerig, Torsten
    Nanofocus AG, Oberhausen, Germany.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Global and local mapping of motor blocks liners roughness for the analysis of honing performance2014Ingår i: Journal of physics, ISSN 1742-6588, Vol. 483, nr 1, artikel-id 012009Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The manufacturing and finishing (honing) of cylinder liners for the automotive industry is a constant challenge in order to reduce friction losses and oil consumption. A better knowledge of surfaces generated during plateau honing is then required for optimization of the process. Despite a well-known and controlled honing process, variations in surface roughness appear at both global (due to honing tool wear) and local (TDC, middle stroke, BDC) scales and need to be mapped and analysed. The following paper proposes to map the global and local variations in roughness by using a confocal 3D measuring equipment able to measure and scan any area of a cylinder liner. Six motor blocks (five liners each) are evaluated with twenty topography measurements per liner. In total, six hundred 3D measurements of size 1×1 mm are performed and roughness parameters are computed. The results show that some parameters do correlate with the honing tool wear specific to each cylinder. Experimental models could be built. Furthermore surface roughness varies significantly over the axial length of the liners due to waviness deviations combined with a lack of flexibility of the honing tool in axial direction. © Published under licence by IOP Publishing Ltd.

  • 50.
    Cabanettes, Frederic
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor. University of Lyon – ENISE, Saint-Etienne, France.
    Joubert, A.
    University of Lyon – ENISE, Saint-Etienne, France.
    Rech, Joel
    University of Lyon – ENISE, Saint-Etienne, France.
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Multi scale analysis of as built surfaces generated in metal additive manufacturing2017Ingår i: Mets&Props 2017: 16th International Conference on Metrology and Properties of Engineering Surfaces: Conference abstracts, 2017, s. 149-150Konferensbidrag (Refereegranskat)
12345 1 - 50 av 241
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