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New results in robust actuator fault reconstruction for linear uncertain systems using sliding mode observers. (English) Zbl 1127.93313
Summary: This paper presents a robust actuator fault reconstruction scheme for linear uncertain systems using sliding mode observers. In existing work, fault reconstruction via sliding mode observers is limited to either linear certain systems subject to unknown inputs, relative degree one systems or a specific class of relative degree two systems. This paper presents a new method that is applicable to a wider class of systems with relative degree higher than one, and can also be used for systems with more unknown inputs than outputs. The method uses two sliding mode observers in cascade. Signals from the first observer are processed and used to drive the second observer. Overall, this results in actuator fault reconstruction being feasible for a wider class of systems than using existing methods. A simulation example verifies the claims made in this paper.
MSC:
93B07Observability
93C05Linear control systems
93C41Control problems with incomplete information
93C15Control systems governed by ODE
93B35Sensitivity (robustness) of control systems