Génération de modèles analytiques pour la conception préliminaire de systèmes multi-physiques : application à la thermique des actionneurs et des systèmes électriques embarqués

Abstract : The objective of this thesis is to develop methods and tools dedicated to the preliminary design of multi-physical systems, with a particular attention to the thermal modelling of actuators and embedded electrical systems. This need arises from the current industrial research which led to the More Electrical Aircraft program (MEA), which deals with new technologies of embedded systems where the thermal management of such devices is essential. First of all, this thesis proposes a methodology based on dimensional analysis and surrogate modelling technique to generate analytical models from finite element simulations. Furthermore, a methodology for constructing optimal design of experiments intended for building surrogate models using dimensionless variables is also proposed. Finaly, two numerical approaches which enable to reduce the number of dimensionless variables of a problem and to study their physical significance are proposed. The first approach uses sensitivity analysis in an original way to highlight the physical significance of the dimensionless numbers for a considered problem. The second approach uses optimization algorithms to reduce the number of dimensionless variables. In the second part of the thesis, the proposed methods were successfully applied to model several components of an electromechanical actuator (EMA) of an aileron (electrical brushless motor, mechanical housing, etc.), and of a power converter (capacitor, inductance, heatsink) used in an aeronautical context.
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Florian Sanchez. Génération de modèles analytiques pour la conception préliminaire de systèmes multi-physiques : application à la thermique des actionneurs et des systèmes électriques embarqués. Génie mécanique [physics.class-ph]. Université Paul Sabatier - Toulouse III, 2017. Français. ⟨NNT : 2017TOU30081⟩. ⟨tel-01865528⟩

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