Search for dissertations about: "TEKNIKVETENSKAP Teknisk mekanik Strömningsmekanik"

Showing result 6 - 10 of 75 swedish dissertations containing the words TEKNIKVETENSKAP Teknisk mekanik Strömningsmekanik.

  1. 6. CFD of Duct Acoustics for Turbocharger Applications

    University dissertation from Stockholm : KTH

    Author : Emma Alenius; Mats Åbom; Laszlo Fuchs; Federico Piscaglia; [2010]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Aero acoustics; Large Eddy Simulation; IC-engines; 1D models; turbocharger; orifice plate; TECHNOLOGY Engineering physics Acoustics; TEKNIKVETENSKAP Teknisk fysik Akustik; TECHNOLOGY Engineering mechanics Fluid mechanics; TEKNIKVETENSKAP Teknisk mekanik Strömningsmekanik;

    Abstract : The search for quieter internal combustion engines drives the quest for a better understanding of the acoustic properties of engine duct components. In this work the main focus is the turbocharger compressor and a discussion of turbocharger acoustics and earlier work within the area is presented, giving an insight into its sound generating mechanisms and the damping effect it has on pressure pulses, i. READ MORE

  2. 7. Analytical Aerodynamic Simulation Tools for Vertical Axis Wind Turbines

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Paul Deglaire; Hans Bernhoff; Olov Ågren; Staffan Lundstrom; [2010]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vertical axis turbine; vortex flows; conformal mapping; analytical aerodynamics; potential flows; fast multipole methods; TECHNOLOGY Engineering mechanics Fluid mechanics; TEKNIKVETENSKAP Teknisk mekanik Strömningsmekanik; Teknisk fysik; Engineering Science;

    Abstract : Wind power is a renewable energy source that is today the fastest growing solution to reduce CO2 emissions in the electric energy mix. Upwind horizontal axis wind turbine with three blades has been the preferred technical choice for more than two decades. This horizontal axis concept is today widely leading the market. READ MORE

  3. 8. Analysis of laminar and turbulent flows with turbomachinery, biotechnology and biomechanical applications

    University dissertation from Stockholm : Mekanik

    Author : Gustaf Mårtensson; Arne Johansson; Gertjan van Heijst; [2006]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TECHNOLOGY Engineering mechanics Fluid mechanics; TEKNIKVETENSKAP Teknisk mekanik Strömningsmekanik;

    Abstract : The goal of this study was initially to gain a better understanding of the effects of rotation on turbulent flow in ducts. Knowledge concerning the influence of rotation on the structures of turbulence is of fundamental importance in many applications, e.g. READ MORE

  4. 9. On Noise Generation and Dynamic Transmission Error of Gears

    University dissertation from Stockholm : KTH

    Author : Mats Henriksson; Leping Feng; Reader Andy Moorhouse; [2009]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TECHNOLOGY Engineering mechanics Vehicle engineering; TEKNIKVETENSKAP Teknisk mekanik Farkostteknik; TECHNOLOGY Engineering physics Acoustics; TEKNIKVETENSKAP Teknisk fysik Akustik;

    Abstract : Noise from heavy trucks is an important environmental issue. Several sources contribute to the total noise level of a vehicle, such as the engine, gearbox, tires, etc. The tonal noise from the gearbox can be very disturbing for the driver, even if the noise level from the gearbox is lower than the total noise level. READ MORE

  5. 10. Experimental Determination of Aeracoustic Sources in Low Mach Number Internal Flows

    University dissertation from Stockholm : KTH

    Author : Andreas Holmberg; Hans Bodén; Lars Enghardt; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Aeracoustics; ducts; N-ports; scattering matrix; wave decomposition; source determination; over-determination; flow noise; fluid-acoustic interaction; fluid-structure-acoustic interaction; wave number; T-junction; power balance; grazing-bias flow; TECHNOLOGY Engineering physics Acoustics; TEKNIKVETENSKAP Teknisk fysik Akustik; TECHNOLOGY Engineering mechanics Vehicle engineering; TEKNIKVETENSKAP Teknisk mekanik Farkostteknik;

    Abstract : In this thesis, the in-duct experimental methods for determining aeroacoustic N-ports of in-duct elements are discussed and improved. The scattering matrix determination methods and the related wave decomposition methods are evaluated from measurements in an empty duct carrying a mean flow. READ MORE