Search for dissertations about: "sound absorption"
Showing result 1 - 5 of 29 swedish dissertations containing the words sound absorption.
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1. Absorption of Sound : On the effects of field interaction on absorber performance
Abstract : Environmental noise has for decades been a well known problem, especially in urban areas. As noise requirements for vehicles are sharpened, noise reducing concepts are needed in early design stages requiring accurate simulations to support the design. READ MORE
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2. Analysis of Acoustic Absorption with Extended Liner Reaction and Grazing Flow
Abstract : Acoustic absorbing liners are efficient and commonly used measures to reduce sound levels in many fields of application. The sound reducingperformance of the liners is dependent on the acoustic state, defined by e.g. the flow and sound field interacting with the liner. READ MORE
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3. Glass mat reinforced thermoplastics - material, process and selected applications
Abstract : The work presented in this thesis covers the processing of glass mat reinforced thermoplastics, GMT, and the mechanical properties of this material group. The thesis evaluates the possibilities of the material group from a processing and mechanical properties point of view. READ MORE
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4. Micro-structural based acoustic modelling of anisotropic open cell materials
Abstract : A method for the calculation of the acoustic performance of open-cell foammaterials is discussed. From a known micro-structural geometry and theconstituent material, the relevant acoustic properties are computed using apreviously published analytical method for the calculation of the dynamicdrag impedance and a previously published method for the calculation of theelastic moduli. READ MORE
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5. Acoustic scattering in ducts and influence of flow coupling
Abstract : The subject of this thesis is the acoustic properties offlow duct area expansions and the influence of flow-acousticcoupling at sharp edges. For low Mach number flow, significantinteraction between the sound field and the flow field canoccur at such points of flow separation. READ MORE