Robust fault diagnosis for non-linear difference-algebraic systems

摘要: A new robust fault diagnosis method based on linear matrix inequality (LMI) for non-linear difference-algebraic systems (DAS) with uncertainties is proposed. Based the known nominal model of DAS, it firstly constructs an auxiliary system consisting a difference equation and algebraic equation, then converts problem identification into parameter estimation, finally realizes using LMI method. This can not only detect, isolate identify faults but also give upper bounds error. Simulation indicates that satisfactory diagnostic results both abrupt incipient faults.