Fault Detection and Isolation Based on Adaptive Observers for Nonlinear Dynamic Systems

In this paper we propose a new method for fault detection and isolation based on adaptive observers. Each adaptive observer estimates the state variables and one of the parameters of the monitored system. The algorithms for both residual generation and evaluation are presented in detail. The proposed method is applicable to all nonlinear dynamic systems for which the required observers and adaptive observers can be designed. The presentation is illustrated throughout the paper by a simulation example, a controlled satellite. Mots cl es : d etection et diagnostic de pannes, syst eme non lin eaire, obser-vateur adaptatif.