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Year: 2003
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Dissertation
Year: 2016 Publisher: Liège Université de Liège (ULiège)
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Numerical study of the different parameters in the resolution of the helmholtz equation using the Schwarz domain decomposition method
Dissertation
Year: 2017 Publisher: Liège Université de Liège (ULiège)
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Wave problems are often encountered in several fields of physics. Acoustic, electromagnetic, seismology and mechanical waves in solids or fluids, inter alia. These problems can be solved using their harmonic solutions that correspond to solutions subjected to harmonic excitations. Using a finite element method, a fairly fine mesh needs to be used to properly represent the wave behavior. In a three-dimensional problem, this can lead to a significant number of complex unknowns, especially at high frequencies. Thus, using direct sparse solvers is not suitable for these kinds of problems, while iterative solvers converge slowly or worse, diverge. Domain decomposition methods such are used to overcome this problem. This work analyses the Schwarz domain decomposition method, presents a partitioning tool used to automatically create partitioned meshes and applies the method to geophysical wave.
Dissertation
Year: 2018 Publisher: Liège Université de Liège (ULiège)
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The purpose of this thesis is to simulate an iso-speed regulation of a rotating compressor test bed using an electrical machine. Actually, the compressor absorbs power depending to the rotating speed. But the valve closure percentage for the inlet or outlet may change the braking torque. It is mainly about the dynamic functionning of electrical drivers and specifically the induction machine. It contains several control techniques and simulations to choose the most appropriated regulation for this application.
compressor test bed --- electric machine --- induction machine --- scalar control --- field-oriented-control --- Ingénierie, informatique & technologie > Multidisciplinaire, généralités & autres --- Ingénierie, informatique & technologie > Ingénierie aérospatiale --- Ingénierie, informatique & technologie > Ingénierie mécanique --- Ingénierie, informatique & technologie > Ingénierie électrique & électronique
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