Diagnostic et commande active tolérante aux défauts appliqués aux systèmes décrits par des multi-modèles linéaires

Abstract : The main work presented in this document deals with diagnosis and Active Fault Tolerant Control (AFTC) for systems described by multi-models. The first part consists in an Adaptive Filter design through a multi-model representation. The main contribution is an adaptive filter design for fault estimation. The stability is ensured by use of LMI. The second step is the design of polytopic Unknown Inputs Observers (UIO) in multi-models framework. These polytopic UIO allow to consider different distribution matrices. A pole placement is also considered with LMI so as to guarantee a decay-rate of the UIO. AFTC is considered with a FDI scheme which provides an accurate fault magnitude estimation. Two control laws are synthesized : one uses a state feedback and the other one considers an output feedback. These two control laws ensure closed-loop system stability through pole placement in the unit circle despite of multiple actuator failures.
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Mickaël Rodrigues. Diagnostic et commande active tolérante aux défauts appliqués aux systèmes décrits par des multi-modèles linéaires. Autre. Université Henri Poincaré - Nancy 1, 2005. Français. ⟨NNT : 2005NAN10149⟩. ⟨tel-01748079⟩

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