Développement multipolaire en harmoniques sphériques et propagation des incertitudes appliqués à la modélisation de source de rayonnement en compatibilité électromagnétique

Abstract : With the advances in technology, the power density of electrical equipment is increasing, which leads to an increase in electromagnetic interference between two power electronic systems. This interference may cause the electronic equipment to malfunction. In order to avoid such problems, a large number of experimental verifications are necessary after the development of a prototype, which leads to a significant additional cost in its industrial cycle. This thesis aims at taking into account the problems of near-field electromagnetic compatibility in the design phase of a product. The method is based on the development in spherical harmonics of the parasitic radiation generated by the devices or the components of the device. The harmonic coefficients of a device make it possible not only to model its near field by a punctual source, but also to determine the inductive coupling with the others. In this context, the multipole expansion method is studied theoretically, numerically (by the software Flux3D) and experimentally in this work. In this document, the new automated measuring system is presented and different approaches related to the solution of this problem are then studied, such as the optimal choice of the development origin, the error compensation of the measurements due to the secondary sources, the study of the propagation of uncertainty in the inverse problem and how to take into account the a priori information, etc.
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Zhao Li. Développement multipolaire en harmoniques sphériques et propagation des incertitudes appliqués à la modélisation de source de rayonnement en compatibilité électromagnétique. Autre. Université de Lyon, 2017. Français. ⟨NNT : 2017LYSEC049⟩. ⟨tel-02141494⟩

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