Search for dissertations about: "harmonic propagation"
Showing result 6 - 10 of 31 swedish dissertations containing the words harmonic propagation.
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6. Managing uncertainties through efficient calculation of transients and harmonic propagation in power systems
Abstract : The electric power system is undergoing changes including large-scale introduction of renewable energy sources together with HVDC/FACTS, changes in the network such as increased amount of high voltage cables, industrial electrification, and changes in the load composition. These changes will impact the system in different ways and lead to challenges that must be addressed to facilitate planning, dimensioning, and operation of the system in a secure and economical way. READ MORE
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7. Topology optimization for acoustic wave propagation problems
Abstract : The aim of this study is to develop numerical techniques for the analysis and optimization of acoustic horns for time harmonic wave propagation. An acoustic horn may be viewed as an impedance transformer, designed to give an impedance matching between the feeding waveguide and the surrounding air. READ MORE
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8. Topics in Analysis and Computation of Linear Wave Propagation
Abstract : This thesis concerns the analysis and numerical simulation of wave propagation problems described by systems of linear hyperbolic partial differential equations. A major challenge in wave propagation problems is numerical simulation of high frequency waves. READ MORE
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9. Numerical Methods for Aeroacoustic Analysis of Turbomachines
Abstract : Numerical simulations are important tools for developing new aircraft that can meet future needs. When numerical simulations are used to compute aircraft noise, a two-step procedure is often employed. In the first step, the noise sources are determined using, e.g. READ MORE
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10. Modelling tools for quieter vehicles : Waves in poro– and visco–elastic continua
Abstract : New modelling tools intended to contribute to the development of components for quieter vehicles are developed. The tools are based on continuum models for wave propagation in poro– and visco–elastic media. By using geometric attributes of the studied components, the computational cost may be radically decreased compared to traditional methods. READ MORE