Fault Diagnosis of a Class of Uncertain Nonlinear Systems with Lipschitz Nonlinearities
Polycarpou, Marios M.
Edition7th IFAC Symposium on Fault Detection, Supervision and Safety of Technical Processes
SourceIFAC Proceedings Volumes
7th IFAC Symposium on Fault Detection, Supervision and Safety of Technical Processes
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This paper presents a fault detection and isolation scheme for a class of Lipschitz nonlinear systems with nonlinear and unstructured modeling uncertainty. This significantly extends previous results by considering a more general class of system nonlinearities which are modeled as functions of the system input and partially measurable state variables. A new fault diagnosis method is developed using adaptive estimation techniques. The fault isolability conditions are rigorously established via the use of the so-called fault mismatch functions, which are defined to characterize the mutual difference between pairs of faults. "