hh.sePublications
Change search
Refine search result
1234567 101 - 150 of 690
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 101.
    Bååth, Lars
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Fotonik och mikrovågsteknik.
    Method and device for contact level and interface detection2009Patent (Other (popular science, discussion, etc.))
  • 102.
    Bååth, Lars
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Fotonik och mikrovågsteknik.
    Method for analysing a substance in a container2008Patent (Other (popular science, discussion, etc.))
    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.

  • 103.
    Bååth, Lars
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Method for measuring molecular composition or molecular densities in gases2000Patent (Other (popular science, discussion, etc.))
    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.

  • 104.
    Bååth, Lars
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Method for measuring temperature of at least one of gas and a flame in a combustion process1998Patent (Other (popular science, discussion, etc.))
    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.

  • 105.
    Bååth, Lars
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Multi-dimensional imaging method and apparatus2007Patent (Other (popular science, discussion, etc.))
  • 106.
    Bååth, Lars
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Fotonik.
    Noise Spectra from Wind Turbines2013In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 57, p. 512-519Article in journal (Refereed)
    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.

  • 107.
    Bååth, Lars
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Fotonik och mikrovågsteknik.
    Position measuring system2003Patent (Other (popular science, discussion, etc.))
  • 108.
    Bååth, Lars
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Fotonik och mikrovågsteknik.
    Nilsson, Emil
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Method and device for multidimensional imaging2007Patent (Other (popular science, discussion, etc.))
    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

  • 109.
    Bååth, Lars
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Fotonik och mikrovågsteknik.
    Nilsson, Emil
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Multi-dimensional imaging method and apparatus2007Patent (Other (popular science, discussion, etc.))
  • 110.
    Bååth, Lars
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Nilsson, Emil
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Multi-dimensional imaging method and apparatus2007Patent (Other (popular science, discussion, etc.))
    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.

  • 111.
    Bååth, Lars
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Fotonik.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Towards New Interferometer Technology for Surface Metrology2012In: 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, p. 158-161Conference paper (Refereed)
    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.

  • 112.
    Böhm, Annette
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Lidström, Kristoffer
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Jonsson, Magnus
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Larsson, Tony
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Evaluating CALM M5-based vehicle-to-vehicle communication in various road settings through field trials2010In: Proceedings - Conference on Local Computer Networks, LCN, (2010 12 01): 613-620, Piscataway, N.J.: IEEE Press, 2010, p. 613-620Conference paper (Refereed)
    Abstract [en]

    Future cooperative Intelligent Transport Systems (ITS) applications aimed to improve safety, efficiency and comfort on our roads put high demands on the underlying wireless communication system. To gain better understanding of the limitations of the 5.9 GHz frequency band and the set of communication protocols for medium range vehicle to vehicle (V2V) communication, a set of field trials with CALM M5 enabled prototypes has been conducted. This paper describes five different real vehicle traffic scenarios covering both urban and rural settings at varying vehicle speeds and under varying line-of-sight (LOS) conditions and discusses the connectivity (measured as Packet Reception Ratio) that could be achieved between the two test vehicles. Our measurements indicate a quite problematic LOS sensitivity that strongly influences the performance of V2V-based applications. We further discuss how the awareness of these context-based connectivity problems can be used to improve the design of possible future cooperative ITS safety applications.

  • 113.
    Börjesson, Niklas
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Ibraimi, Shemsedin
    Halmstad University, School of Business and Engineering (SET).
    Statusvisare för diskmaskin2013Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    The following report is based on the graduate job course in CAD technician program year two. The work reflected in the report is done in collaboration with Hans-Erik Eldemark. This work includes the development of a progress bar for dishwashers.The execution of the thesis has involved a list of criteria with conditions and requirements, which after where weighted in a matrix. Subsequently, the product proposal was developed and has been divided into three categories, twist mechanisms, attachments and exterior design. Finally, suggestions have been designed in CATIA V5 and prototypes were produced using 3d-printing

  • 114.
    Cabanettes, Frederic
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Fahlgren, Lars
    Volvo Car Corporation, Gothenburg, Sweden .
    Hoerig, Torsten
    Nanofocus AG, Oberhausen, Germany.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Global and local mapping of motor blocks liners roughness for the analysis of honing performance2014In: Journal of physics, ISSN 1742-6588, Vol. 483, no 1, article id 012009Article in journal (Refereed)
    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.

  • 115.
    Cabanettes, Frederic
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces. 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
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Multi scale analysis of as built surfaces generated in metal additive manufacturing2017In: Mets&Props 2017: 16th International Conference on Metrology and Properties of Engineering Surfaces: Conference abstracts, 2017, p. 149-150Conference paper (Refereed)
  • 116.
    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.

  • 117.
    Cabanettes, Frédéric
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Alessi, Julien
    Bonomi, T.
    Faure, N.
    Mohlin, Johan
    Finnveden Powertrain, Lidköping, Sweden.
    Rosén, B-G
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Testing functional surfaces of heavy duty valve train components under realistic operating conditions2012In: 15th Nordic Symposium on Tribology, 12-15 June 2012, Trondheim, Norway, 2012Conference paper (Refereed)
  • 118.
    Cabanettes, Frédéric
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Anderberg, Cecilia
    Volvo Cars Corp..
    Dimkovski, Zlate
    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.
    Optimizing the Manufacturing of Driveline Surfaces Roughness Parameters and Rough Contact Modeling2009In: Proceedings of the 12th International Conference on Metrology and Properties of Engineering Surfaces: July 8th - 10th 2009, Rzeszów, Poland / [ed] P. Pawlus, L. Blunt, B.-G. Rosén, T. Thomas, M. Wieczorowski, H. Zahouani, Rzeszòv, Poland: Rzeszow University of Technology , 2009Conference paper (Refereed)
  • 119.
    Cabanettes, Frédéric
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Claret-Tournier, Julien
    Mohlin, Johan
    Nilsson, Per Henrik
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Xiao, Li
    The evolution of surface topography of injection cams2007In: Proceedings of the 11th International Conference on Metrology and Properties of Engineering Surfaces: July 17th - 20th 2007, Huddersfield, UK / [ed] Liam Blunt, Huddersfield: Huddersfield University , 2007Conference paper (Refereed)
  • 120.
    Cabanettes, Frédéric
    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.
    Rosén, B.-G.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Roughness variations in cylinder liners induced by honing tools’ wear2015In: Precision engineering, ISSN 0141-6359, E-ISSN 1873-2372, Vol. 41, p. 40-46Article in journal (Refereed)
    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 due to honing tool wear and need to be mapped and analyzed. The following paper proposes to map the variations in roughness by using confocal 3D measuring equipment able to inspect any area of a cylinder liner. Six motor blocks, each with five cylinder liners, were evaluated with 20 topography measurements per liner (giving six hundred 3D measurements in total). In addition to standard 3D roughness parameters, tailor made parameters extracting honing texture information are computed. The results show that only a few parameters (Spk, Ssc and Sk) do correlate with the honing tool wear specific to each cylinder. Tailor made parameters indicate similar results. Indeed, as the honing tool wears down, the cylinder liner surface gets rougher plateau or peaks and sharper asperities indicating that ploughing occurs instead of cutting. In future, experimental models could be built in order to perform production and functional optimizations. © 2015 Elsevier Inc. All rights reserved.

  • 121.
    Cabanettes, Frédéric
    et al.
    University of Lyon – ENISE, Saint-Etienne, France.
    Faverjon, Pierre
    PCI SCEMM – Tongtai Group, Saint-Etienne, France.
    Sova, A.
    University of Lyon – ENISE, Saint-Etienne, France.
    Dumont, F.
    University of Lyon – ENISE, Saint-Etienne, France.
    Rech, Joel
    University of Lyon – ENISE, Saint-Etienne, France.
    Dimkovski, Zlate
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Influence of surface topography on starvation of lubricated contacts: application to MQL machining2017In: Mets&Props 2017: 16th International Conference on Metrology and Properties of Engineering Surfaces: Conference abstracts, 2017, p. 187-189Conference paper (Refereed)
  • 122.
    Cabanettes, Frédéric
    et al.
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS). University of Lyon, ENISE, Laboratoire de Tribologie et Dynamique des Systèmes, Saint-Etienne, France.
    Joubert, A.
    University of Lyon, ENISE, Laboratoire de Tribologie et Dynamique des Systèmes, Saint-Etienne, France.
    Chardon, G.
    University of Lyon, ENISE, Laboratoire de Tribologie et Dynamique des Systèmes, Saint-Etienne, France.
    Dumas, V.
    University of Lyon, ENISE, Laboratoire de Tribologie et Dynamique des Systèmes, Saint-Etienne, France.
    Rech, J.
    University of Lyon, ENISE, Laboratoire de Tribologie et Dynamique des Systèmes, Saint-Etienne, France.
    Grosjean, C.
    Centre Technique des Industries Mécaniques, Saint-Etienne, France.
    Dimkovski, Zlate
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Topography of as built surfaces generated in metal additive manufacturing: A multi scale analysis from form to roughness2018In: Precision engineering, ISSN 0141-6359, E-ISSN 1873-2372, Vol. 52, p. 249-265Article in journal (Refereed)
    Abstract [en]

    Topographies are one of the challenges for the development of the metal additive manufacturing promising technique. The article investigates multi scale topographies (from form to roughness) of as built surfaces generated by selective laser melting (SLM). Different building inclinations of samples were observed both for upskin and downskin surfaces with a wide range of measuring techniques. The two main aims are: (i) to make a critical review of measuring techniques at different scales, (ii) to enlighten the different surface generation phenomena (and the corresponding scale) occurring during additive manufacturing. The effect of heat treatment on each scale of the topography is also discussed. It is found that the focus variation technique is well suited for AM surfaces. Concerning the observation of the inclined surfaces, some parameters are emphasized as good indicators of typical signatures of AM surfaces: isotropy for the weld track component, the skewness and Rsm for the staircase effect, fractal dimension for the presence of partly melted particles. The different parameters studied helps to model and understand the different surface generation phenomena aforementioned. © 2018 Elsevier Inc.

  • 123.
    Cabanettes, Frédéric
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Löfgren, Hans Bertil
    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.
    Evaluation of manufacturing processes for cam/roller contact2011Conference paper (Refereed)
  • 124.
    Cabanettes, Frédéric
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Löfgren, Hans Bertil
    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.
    The impact of manufacturing processes on Automotive Cam/Roller Contact2011Conference paper (Refereed)
  • 125.
    Cabanettes, Frédéric
    et al.
    University of Lyon, ENISE LTDS, Saint-Etienne, France.
    Rolland, Julian
    University of Lyon, ENISE LTDS, Saint-Etienne, France.
    Dumont, Florian
    University of Lyon, ENISE LTDS, Saint-Etienne, France.
    Rech, Joël
    University of Lyon, ENISE LTDS, Saint-Etienne, France.
    Dimkovski, Zlate
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Influence of Minimum Quantity Lubrication on Friction Characterizing Tool–Aluminum Alloy Contact2016In: Journal of tribology, ISSN 0742-4787, E-ISSN 1528-8897, Vol. 138, no 2, article id 021107Article in journal (Refereed)
    Abstract [en]

    The possibility to reduce the amount of cutting fluids from machining processes is actively studied by the industrials and researchers. Minimum Quantity Lubrication (MQL) is a solution towards cutting fluids reduction. This article investigates the consequences on friction coefficient induced by the use of MQL. A tribometer is used in order to simulate experimentally the tribological conditions encountered during machining. As the cutting speed increases a lower amount of oil is deposited on the rough surfaces. Depending on the MQL operating conditions and sliding velocities it is plausible to reach starvation by leaving the real rough contact partly dry. A model computing a starvation percentage by filling an estimated oil amount in a deformed topography correlates with the experimental results. © 2015 by ASME

  • 126. Carlsson, Mathilda
    et al.
    Hammarstig, Tobias
    MT Alarms2013Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
  • 127.
    Carlsson, Rickard
    Halmstad University.
    Touch: Konstruktion för taktil massage2016Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

    Touch står för Tactile Oscillating Universal Caressing Hand och är en idé om att skapa enp rodukt som hjälper människor som lider av eksem, stress eller andra psykiska åkommor. Genom att ge huden taktil massage genom en klappningsrörelse ska Touch ge avslappning till användaren. Det ska finnas flera olika utbytbara munstycken som ger hårdare eller mjukare massage.

    Rapporten redovisar ett förslag på hur Touch kan utformas för att uppnå dess syfte. Deninnehåller 3D-modeller och ritningar av konstruktionen samt dess individuella delar. Rapporten avhandlar också vilka krav som ställts på Touch och hur arbetet genomförts.

    Projektet har avgränsats till att endast göra ett förslag på hur Touch kan konstrueras för attuppfylla kraven och detta har gjorts med hjälp av 3D-modeller och ritningar. Det har heller inte tagits någon hänsyn till den elektroniska delen som krävs för att produkten i slutändan ska fungera.

  • 128.
    Carpatorea, Iulian
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR - Center for Applied Intelligent Systems Research.
    Slawomir, Nowaczyk
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR - Center for Applied Intelligent Systems Research.
    Rögnvaldsson, Thorsteinn
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR - Center for Applied Intelligent Systems Research.
    Elmer, Marcus
    Volvo Group Trucks Technology, Göteborg, Sweden.
    Lodin, Johan
    Volvo Group Trucks Technology, Göteborg, Sweden.
    Learning of Aggregate Features for Comparing Drivers Based on Naturalistic Data2016In: Proceedings: 2016 15th IEEE International Conference on Machine Learning and Applications (ICMLA) / [ed] Lisa O’Conner, Los Alamitos, CA: IEEE Computer Society, 2016, p. 1067-1072Conference paper (Refereed)
    Abstract [en]

    Fuel used by heavy duty trucks is a major cost for logistics companies, and therefore improvements in this area are highly desired. Many of the factors that influence fuel consumption, such as the road type, vehicle configuration or external environment, are difficult to influence. One of the most under-explored ways to lower the costs is training and incentivizing drivers. However, today it is difficult to measure driver performance in a comprehensive way outside of controlled, experimental setting.

    This paper proposes a machine learning methodology for quantifying and qualifying driver performance, with respect to fuel consumption, that is suitable for naturalistic driving situations. The approach is a knowledge-based feature extraction technique, constructing a normalizing fuel consumption value denoted Fuel under Predefined Conditions (FPC), which captures the effect of factors that are relevant but are not measured directly.

    The FPC, together with information available from truck sensors, is then compared against the actual fuel used on a given road segment, quantifying the effects associated with driver behavior or other variables of interest. We show that raw fuel consumption is a biased measure of driver performance, being heavily influenced by other factors such as high load or adversary weather conditions, and that using FPC leads to more accurate results. In this paper we also show evaluation the proposed method using large-scale, real-world, naturalistic database of heavy-duty vehicle operation.

  • 129.
    Cavdarovski, Martin
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Borg, Christopher
    Halmstad University, School of Business, Engineering and Science.
    Cleaning machine: In cooperation with HRI Teknik and Robomatic2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The following project is a collaboration with HRI Teknik and Robomatic AB, that found a possible market for improving cleanliness in grocery stores by improving the hygiene of costumer baskets. Bacteria and left over items in the basket builds up a health risk for the costumers, if not properly cleaned regularly. The dirt and bacteria from the basket is broth home thru the groceries coming in contact during shopping. The need has been strengthened by surveys for the two store managers and the customers of the grocery store.

    To reduce the spreads of diseases, the baskets should be cleaned better and more frequently by having the proper detergent and cleaning system. The aim of the study is to develop a concept of a cleaning machine for baskets used in grocery stores. This is done by a well- defined technical driven development process, considering all six steps.

    The supportive research concerning framework has laid as a foundation for the construction of the cleaning machine. Research proves that framework creates a robust and safe construction, absorbing tensile and compressive forces in the longitudinal direction.

    The outcome from the technical driven process and the theoretical study is a visual, three dimensional model of concept. The concepts main function is to be driven by a belt with hooks, which is hanging on the machine. The baskets are then hanged on the movable belt in order to get cleaned. During the project, resources as material, working place and expertise is provided to sufficient degree so a concept can be developed.

    Since the project has a limited period of time, it was recognized the project would not be able to get to the production stages. The concept and function need to be tested and investigated to solve the remaining details. This is left for further development beyond the project, and is laying at HRI Teknik and Robomatic AB. 

  • 130.
    Cedergren, David
    Halmstad University, School of Business and Engineering (SET).
    Optimering av maskinprocess2012Independent thesis Basic level (degree of Bachelor), 5 credits / 7,5 HE creditsStudent thesis
  • 131.
    Cedergren, David
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Stolt, Jesper
    Halmstad University, School of Business and Engineering (SET).
    Elektrisk skorstenständare2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 132.
    Cedergren, Marcus
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Nilsson, Bo
    Halmstad University, School of Business and Engineering (SET).
    Parametrisering av lyftok2012Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
  • 133.
    Cenanovic, Mirza
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Khanmohammadi, Mahdieh
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Implementation of a non-conforming rotated Q1 approximation on tetrahedron2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Our project consists of two parts (A and B). In part A we solve a linear elasticity problem with implementing a rotated  approximation method and simulating the problem in commercial softwares (COMSOL and SolidWorks). To evaluate the results we implement an analytical eigenvalue solver. As a simple case, we use a cube with side length of L = 1m made of Alloy steel with density of 7850 Kg/m^3.  In part B we implement a time dependent linear elasticity problem on a beam made of Alloy steel with density of 7850 Kg/m^3 with size of 1x0.1x0.01m. We use the implicit method to solve our problem. The frequency results in part A show that the rotated Q1 approximation method works more accurate than the commercial software. 

  • 134.
    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.

  • 135.
    Chau, Kevin
    et al.
    Halmstad University.
    Chau, Jimmy
    Halmstad University.
    SmartBand Alert: Produktframtagning2017Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    The project members has chosen to collaborate with the taskpersons David Almgren and Hussam Alshammari. Because both are ambitious and driven students from Halmstad University with an interesting project in product development and want to further develop the 3D-model as the authors has developed for them. The task has been to develop a new design for capsule and bracelet to Smartband Alert which consists of circuit components as the taskpersons has programmed and developed.

     

    The thesis is based on Fredy Olsson’s method of principle construction, primary construction and manufacturing construction. The method is used when a new product is to be developed but also when it comes to the development/improvement of a product. The authors do not follow Fredy Olsson's method from beginning to end but has chosen content which is relevant for the project.

     

    In the project, the authors have developed 3D-models in the CAD-program; CATIA V5-6R2016 as a tool to be able to produce a conclusive 3D-model that fits existing component parts, as taskpersons has assigned to the authors. In order to be able to manufacture the product, the authors produced 3D-drawings. Finally has a model been manufactured by a 3D-printer to the taskpersons, to be able to see and test the model in reality.

  • 136.
    Chau, Kevin
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Johansson, Elias
    Halmstad University, School of Business, Engineering and Science.
    Konceptframtagning av infästning2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 137.
    Chee, John
    Halmstad University, School of Business, Engineering and Science.
    Investigations on Energy Efficient Buildings: - the aim to reach zero energy buildings2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The European Parliament Buildings Directive (EPBD) obliges Sweden to develop plans to

    enhance the amount of NZEB. Define what NZEB for them exactly constitutes - technical

    definitions and system boundaries for energy performance calculations. The National Board

    of Housing, Building and Planning in Sweden has received an assignment from the Swedish

    government to propose the definition and quantitative approach on energy requirements for

    NZEB. NBHBP suggest the system boundary should be the delivered (bought) energy. The

    delivered energy divide into two different energy form. The set system boundary to calculate

    the specific energy performance with the introduced weighted factor. Makes it possible to

    compensate the specific energy performance by using renewable energy generators on site.

    The risk is inefficient buildings can use renewable energy technologies on site to compensate

    the delivered energy to achieve the 80 kWh/m2, year (the proposed energy requirements for

    NZEB). This results to high energy cost along with large investments in renewable

    technologies on site, or the need to add fossil fuels to make up the high-energy demand. The

    both reference houses Circuitus and Bright Living are NZEB, per the Swedish definition

    proposal of NZEB from NBHBP. The most significant difference is Circuitus has better heat

    exchanger and building envelope than Bright Living.

  • 138.
    Chibba, Aron
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Rundquist, Jonas
    Halmstad University, School of Business, Engineering and Science, Centre for Innovation, Entrepreneurship and Learning Research (CIEL), Centre for Technology, Innovation and Marketing Management (CTIM2).
    Effective Information Flow in the Internal Supply Chain: Results from a snowball method to map information flows2009In: Journal of Information & Knowledge Management, ISSN 0219-6492, E-ISSN 1793-6926, Vol. 8, no 4, p. 331-343Article in journal (Refereed)
    Abstract [en]

    Information sharing is an important factor for effectiveness within the internal supply chain. In this paper we use a methodology for mapping information flows in an internal supply chain, and case studies in two Swedish multinational organizations. Eight retrospective cases were used to map, describe and analyze the information flow that supports the physical material flow from the receipt of an order to point of delivery. Every involved person was interviewed on at least one occasion each. The interviews were conducted to map and describe the information and physical material flow. The aim was to identify factors that could improve and rationalise information flows and generate a better flow within the organization.

    The study shows the importance of an integrated information system, but also clearly indicates the importance of a collaborative culture and an awareness of the human-technology interface. The study also shows that three factors of interface distortions are most frequent in the cases: (1) changes registered in the database trigger no action among the staff, (2) new knowledge to staff is stored only orally and not in the database, and (3) interface between the paper system and the database, and between the old and the new information storage culture.

  • 139.
    Chibba, Aron
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Rundquist, Jonas
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Förbättring av produktinnovationsprocesser inom ramen för TQM2001In: Forskningssamverkan och nya former av kunskapsbildning: sammanställning av bidrag till konferensen Högskolor och samhälle i samverkan, Högskolan i Halmstad, 9-11 maj 2001 : proceedings from the 2nd HSS Research Conference, Halmstad University, Sweden, May 9-11, 2001 / [ed] Kjell Eriksson, Halmstad: Högskolan i Halmstad , 2001, p. 249-258Conference paper (Other (popular science, discussion, etc.))
    Abstract [sv]

    Forskning inom management och organisation indikerar att innovativa företag är dubbelt så lönsamma som andra företag (Tidd et. al., 1997). Innovationsverksamhet är riskabel och svår att organisera, men sedan 1980-talet har ett flertal modeller presenterats för att organisera innovationsverksamhet. Forskningen inom detta område benämns ibland Innovation management. TQM-konceptet är en managementfilosofi för att förbättra den operationella kvaliten i ett företag och som baseras på de anställdas deltagande, ständiga förbättringar och kundtillfredsställelse.

    I denna artikel kommer vi att försöka skapa grunden till en kombinerad modell för TQM och innovationsledning som drar nytta av de båda filosofiernas respektive styrkor. Vi kommer också att diskutera hur modellen kan användas och vidareutvecklas av små och medelstora företag i samarbete med högskolan.

  • 140.
    Christian, sandberg
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Hansson, Måns
    The Sally: Ett mekaniskt vattenreningssytem2019Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
  • 141.
    Christiansson, Eric
    et al.
    Halmstad University, School of Business and Engineering (SET). CAD-Tekniker.
    Moretti, David
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK). CAD-Tekniker.
    Kinematics methodology and simulation in Catia v52013Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
  • 142.
    Connolly, David
    et al.
    Aalborg University, Aalborg, Denmark.
    Mathiesen, Brian Vad
    Aalborg University, Aalborg, Denmark.
    Østergaard, Poul Alberg
    Aalborg University, Aalborg, Denmark.
    Möller, Bernd
    Aalborg University, Aalborg, Denmark.
    Nielsen, Steffen
    Aalborg University, Aalborg, Denmark.
    Lund, Henrik
    Aalborg University, Aalborg, Denmark.
    Persson, Urban
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energy Science.
    Nilsson, Daniel
    Halmstad University, School of Business, Engineering and Science.
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energy Science.
    Trier, Daniel
    PlanEnergi, Copenhagen, Denmark.
    Heat Roadmap Europe 2050: First Pre-study for the EU272012Report (Other academic)
    Abstract [en]

    This pre-study presents the findings concerning a considerable outlined expansion of the district heating sector within the current EU27 member states until 2050. Heat deliveries are presumed to grow by a factor of 2.1 until 2030 and by a factor of 3.3 until 2050.

    The current energy policy context is that the latest energy communication from the European Commission (Energy Roadmap 2050) contains only a very modest growth in the future for district heating systems and additional industrial heat use from industrial CHP plants. A small increase is foreseen for industrial demands, while heat deliveries to the residential and service sectors are expected to decrease. In total, the heat delivered is expected to increase by less than one per cent per year, giving a total increase of 20% until 2030 and of 40% until 2050.

    In this prestudy, more ambitious growth rates are assessed for district heating in the EU27 between 2010 and 2050. The chosen methodology in this pre-study contains a combination of hour-by-hour energy modelling of the EU27 energy system and mapping of local conditions, which is essential for district heating analysis. However, the link between these two actions has not been fully utilised in this pre-study due to the limited working time available: The mapping action has only indicated the input to the energy modelling action.

  • 143.
    Connolly, David
    et al.
    Aalborg University, Aalborg, Denmark.
    Mathiesen, Brian Vad
    Aalborg University, Aalborg, Denmark.
    Østergaard, Poul Alberg
    Aalborg University, Aalborg, Denmark.
    Möller, Bernd
    Aalborg University, Aalborg, Denmark.
    Nielsen, Steffen
    Aalborg University, Aalborg, Denmark.
    Lund, Henrik
    Aalborg University, Aalborg, Denmark.
    Persson, Urban
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energiteknik.
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energy Science.
    Grözinger, Jan
    Ecofys Germany GmbH, Cologne, Germany.
    Boermans, Thomas
    Ecofys Germany GmbH, Cologne, Germany.
    Bosquet, Michelle
    Ecofys Germany GmbH, Cologne, Germany.
    Trier, Daniel
    PlanEnergi, Copenhagen, Denmark.
    Heat Roadmap Europe 2050: Second Pre-study for the EU272013Report (Other academic)
    Abstract [en]

    Many strategies have already been proposed for the decarbonisation of the EU energy system by the year 2050. These typically focus on the expansion of renewable energy in the electricity sector and subsequently, electrifying both the heat and transport sectors as much as possible. In these strategies, the role of district heating has never been fully explored system, nor have the benefits of district heating been quantified at the EU level. This study combines the mapping of local heat demands and local heat supplies across the EU27. Using this local knowledge, new district heating potentials are identified and then, the EU27 energy system is modelled to investigate the impact of district heating. The results indicate that a combination of heat savings, district heating in urban areas, and individual heat pumps in rural areas will enable the EU27 to reach its greenhouse gas emission targets by 2050, but at a cheaper price than a scenario which focuses primarily on the implementation of heat savings.

  • 144.
    Cyrén, Oscar
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Harryson, Moa
    Halmstad University, School of Business, Engineering and Science.
    Development of Methods and Guidelines for Upper Extremity Injury in Car Accidents2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The project focus has been development of guidelines and methods for upper

    extremity injury reduction in car crashes. The safety of the central body parts

    improves which indicates the need to develop methods for avoiding non-life

    threatening injuries such as fracture of the arms. The purpose of the project was to

    study the injury mechanisms for the upper extremity in car crashes, and the aim has

    been to propose methods to reduce the injuries. The project focuses on adult

    occupants inside the vehicles front seat, and frontal and side impacts. The procedure

    began with understanding and identifying the injury mechanisms. Studies show that

    most fractures occur on the forearm (radius and ulna) and on the wrists and hands.

    To determine which injury mechanisms that were most frequent, data were collected

    from 29 computer simulations with 29 different crash scenarios. The most common

    kind of impact was the medial part of the wrist in the central part of the instrument

    panel, combined with the impact of the elbow in the center consol. The results of the

    simulations created a basis for the method of the component test, with focus on the

    injury mechanism i.e. the forward movement of the arms into the instrument panel.

    The component test consisted of a test rig, on which was mounted with a measuring

    arm of a 50th percentile male dummy. The arm dropped into a block of expanded

    polypropylene (EPP-block) for observation and study, and with following variable

    parameters: the impact angle of the surface, velocity and position of the wrist. Then

    also an instrumented measuring arm from a 5th percentile female dummy was

    released into an instrument panel.

    The project contributes to knowledge about the injury mechanism of the upper

    extremity in car crashes. The most frequent injury mechanism is a forward movement

    of the arms resulting in an impact with the interior structure of the car. The most

    frequent injured region is the distal part of the upper extremity. The project has

    developed and suggested the first step to a test method for the specific injury

    mechanism. There is a need of more research on how impact angles and velocity

    affect the violence on the arm.

  • 145.
    Cámara Ortiz, Héctor Miguel
    Halmstad University.
    Filling quality control and redesign of small scale bottling machine for carbonated beverages2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The current design of the machine presents efficiency and performance problems,mainly due to over-foaming and lack of accurate fill level controls. A flowdynamics analysis was done with the intention of understanding the factorscontrolling the foam formation and propose improvements that will directly impactthe machine´s KPI´s.

    As result of the analysis the change from counter pressure to atmospheric filling isproposed as well as the re-programing of its PLC together with physical changes tothe flow path, and the use of a better suited speed controlling device.

    The proposed fill speed controlling device was analyzed with the aid ofcomputational fluid dynamics software and then quantitatively characterized. Allthe proposed changes suggest a possible change in speed from 3 bottles per minuteto above 8.5 bottles per minute with minimum intervention to the machine.

  • 146.
    Dahlborg, Gustav
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Andersson, Niklas
    Halmstad University, School of Business and Engineering (SET).
    MC - Trailer Leloup2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    We got in touch with a company in Halmstad with a history of having theises inconnection with the mechanical engineering programs at Halmstad University. Asa response to the availability to a thesis we got a proposal to develop an earlierthesis that the company has had with them. Upon further investigation of thethesis, we decided with the company that a full trailer would be constructed. Ourreport includes our steps to develop a concept design of a trailer. All the essentialsteps we have taken are described in the report, from the conceptual stage to thepoint where you’re able to produce a prototype. We started with the regulationsand standards that exist in the subject, these are closer mentioned in the report.The result of the thesis is a concept design for a trailer, we do believe there isopportunity for further growth, especially through the development of a prototype

  • 147.
    Dahlqvist, Alfred
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Johansson, David
    Halmstad University, School of Business and Engineering (SET).
    Gummiupprullare2013Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    This report is a 7.5hp thesis at the CAD-technicians programme at Halmstad University.

    The group has been asked by the company National Gummi AB in Trönninge to develop a winder for large rubber profiles. Employees roll down rubber profiles in a pallet by hand which can wear out employees backs due to the weight of the rubber profiles.

  • 148.
    Dahlqvist, Alfred
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Johansson, David
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Konstruktion av trehjulig elcykel2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta examensarbete har gjorts i samarbete med företaget Off Course AB, som är beläget i Halmstad, och har gått ut på att tillverka en trehjulig elcykel som är stabil nog att stanna utan att sätta ner fötterna.

    Det är framförallt medelålders och äldre personer som använder en elcykel och ersätter såväl bilresor som kollektivtrafiken. En cykel med tramp- eller vevanordning och elassistans, som inte ger krafttillskott vid hastigheter över 25km/h, räknas som en elcykel. Under projektets början undersöktes de lagar och restriktioner som finns samt hur andra trehjuliga cyklar är konstruerade. En viktig punkt för cykeln är att den ska vara stabil och kunna stå utan något sorts stöd. Författarna har även inspirerats av andra fordon som kan stå utan hjälp och fortfarande ha en bra körupplevelse. Exempel på produkter som undersökts är flakmopeder, trehjuliga motorcyklar samt gokarts.

    När idéförslagen sållats ner till två, valde författarna att tillverka prototyper av dessa för att testa körupplevelsen då det är en viktig faktor. Slutgiltiga lösningen var att använda sig av Ackermanns styrgeometri som även är integrerade på bilar och gokarts.

  • 149.
    Dalla Rosa, Alessandro
    et al.
    Technical University of Denmark, Lyngby, Denmark.
    Li, Hongwei
    Technical University of Denmark, Lyngby, Denmark.
    Svendsen, Svend
    Technical University of Denmark, Lyngby, Denmark.
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energy Science.
    Persson, Urban
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energy Science.
    Rühling, Karin
    Dresden University of Technology, Dresden, Germany.
    Felsmann, Clemens
    Dresden University of Technology, Dresden, Germany.
    Crane, Martin
    Scottish & Southern Energy, Perthshire, United Kingdom.
    Burzynski, Robert
    Scottish & Southern Energy, Perthshire, United Kingdom.
    Bevilacqua, Ciro
    Building Research Establishment, Watford, United Kingdom.
    Annex X Final report: Toward 4th Generation District Heating: Experience and Potential of Low-Temperature District Heating2014Report (Other academic)
    Abstract [en]

    Background and Objective

    The evolution of district heating (DH) has gone through three generations since the first introduction of distirct heating. It is characterized by the type of transport media and the network temperature levels: the 1st generation DH system is steam-based system, the 2nd generation DH uses high network supply temperature above 100oC, and the 3rd generation DH represents the current DH system with medium network supply temperature between 80oC to 100oC. Up until now, the 4th generation DH as the low-temperature district heating (LTDH) is emerging as a new system which is going to replace the existing 3rd generation DH system. Comparing with the existing DH system, the LTDH reduces the network supply temperature down to consumer required temperature level, thus greatly improves the quality match between the energy supply and the energy demand. Meanwhile, LTDH coupling with reduced network temperature and well-designed DH network can reduce network heat loss by up to 75% comparing with the current system. This makes DH economically competitive comparing with local heat generation units in the areas with low heat density or with low-energy buildings.

    The traditional approach to evaluating a DH system often focuses on the production/supply aspect and only afterwards on the final users. The LTDH concept switches the perspective, starting from end-user thermal comfort and a quality match between energy supply and energy consumption, and aiming to find the best and most economical way to satisfy the heat demand through efficient distribution networks and supply systems based on waste heat and RE. The new concept therefore starts by identifying suitable in-house substations for low-energy-demand buildings at low supply temperature, goes back to design efficient and reliable networks, and finally considers environmentally-friendly heat production units.

    This report describes the concept of LTDH, collects and discusses successful examples of implementation LTDH in the building heating sector. The objective of this report is to raise awareness and provide insights that will stimulate the research, development and implementation of LTDH systems. It will help to increase public recognition and assist policy makers and energy planners, both at local and governmental level, in promoting cost-effective and environmentally friendly DH systems, and in planning and realizing long-term sustainable urban area development. To this end, the report addresses the following research issues:

    1. What are the main advantages of LTDH?

    2. What technology options are available for LTDH, and what are the associated challenges to consider?

    3. How can the risk of Legionella be mitigated in LTDH?

    4. What lessons can be learned from early LTDH projects?

    5. What heat distribution costs are associated with LTDH?

  • 150.
    D'Ambrosio, Marco
    et al.
    Halmstad University, School of Business and Engineering (SET). Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Energiteknik.
    Medaglia, Marco
    Halmstad University, School of Business and Engineering (SET). Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Energiteknik.
    Vertical Axis Wind Turbines: History, Technology and Applications2010Independent thesis Advanced level (degree of Master (Two Years)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    In  this  Master Thesis  a  review  of  different  type  of  vertical  axis  wind turbines (VAWT)  and  a preliminary investigation of a new kind of VAWT are presented.

    After an introduction about the historical background of wind power, the report deals with a more accurate analysis of the main type of VAWT, showing their characteristics and their operations. The aerodynamics of the wind turbines and a review of different type on generators that can be used to connect the wind mill to the electricity grid are reported as well.

    Several statistics are also presented, in order to explain how the importance of the wind energy has grown  up  during  the  last  decades  and  also  to  show  that  this development  of  the  market  of  wind power  creates  new  opportunity  also  for VAWT,  that  are  less  used  than  the  horizontal  axis  wind turbine (HAWT).

    In the end of 2009 a new kind of vertical axis wind turbine, a giromill 3 blades type, has been built in Falkenberg, by the Swedish company VerticalWind. The tower of this wind turbine is made by wood,  in  order  to  get  a  cheaper  and  more environment  friendly  structure,  and  a  direct  driven synchronous multipole with permanent magnents generator is located at its bottom. This 200 kW VAWT represents the intermediate step between the 12 kW prototype, built in collaboration with the Uppsala University, and the common Swedish commercial size of 2 MW, which is the goal of the company.

    A  preliminary  investigation  of  the  characteristics  of  this  VAWT  has  been done, focusing  in particular on the value of the frequency of resonance of the tower, an important value that must be never reached during the operative phase in order to avoid serious damage to all the structure, and on the power curve, used to evaluate the coefficient of power (Cp) of the turbine. The results of this investigation and  the steps  followed  to  get  them  are  reported.  Moreover  a  energy production analysis of the turbine has been done using WindPro, as well as a comparison with and older type on commercial VAWT.

1234567 101 - 150 of 690
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf