Search for dissertations about: "Helmholtz problems"
Showing result 1 - 5 of 24 swedish dissertations containing the words Helmholtz problems.
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1. Shape Optimization for Acoustic Wave Propagation Problems
Abstract : Boundary shape optimization is a technique to search for an optimal shape by modifying the boundary of a device with a pre-specified topology. We consider boundary shape optimization of acoustic horns in loudspeakers and brass wind instruments. READ MORE
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2. Inverse Problems in Tomography and Fast Methods for Singular Convolutions
Abstract : There are two, partially interlaced, themes treated in this thesis; inverse problems of tomographic type and fast and accurate methods for the application of convolution operators. Regarding the first theme, the inverse problem of Doppler tomography is considered and the Doppler moment transform is introduced for that purpose. READ MORE
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3. Material distribution-based topology optimization for wave propagation problems
Abstract : This thesis employs material distribution-based topology optimization for wave propagation problems. In the material distribution approach, we define a material indicator function that models the presence and absence of material in a design domain. READ MORE
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4. Reliable hp finite element computations of scattering resonances in nano optics
Abstract : Eigenfrequencies are commonly studied in wave propagation problems, as they are important in the analysis of closed cavities such as a microwave oven. For open systems, energy leaks into infinity and therefore scattering resonances are used instead of eigenfrequencies. READ MORE
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5. Semi-classical approximations of Quantum Mechanical problems
Abstract : .... READ MORE