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JEET, Vol. 13, No. 6, November 2018
Fault Diagnosis of a Nonlinear Dynamic System Based on Sliding Mode
Wenxin Yu
Area D - Information and Control
Abstract Actuator failures and the failures of controlled objects are often considered together. To overcome this limitation, a class of sliding mode observers for the fault diagnosis of nonlinear systems is designed in this paper. Due to the influence of the sliding mode function, the control strategy and the residual change of the observer exhibit certain trends governed by specific relations. Therefore, according to the changes in the control strategy and the observer residuals, the sensor and actuator faults in nonlinear systems can be determined. Finally, the effectiveness of the proposed method is verified based on simulations of a DC motor system.
Keyword Fault diagnosis,Sliding mode,Control strategy
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