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Fault Diagnosis of a Nonlinear Dynamic System Based on Sliding Mode

  • Yu, Wenxin (School of Information and Electrical Engineering, Hunan University of Science and Technology) ;
  • Wang, Junnian (School of Physics and Electronics, Hunan University of Science and Technology) ;
  • Jiang, Dan (School of Information and Electrical Engineering Hunan University of Science and Technology)
  • Received : 2018.03.27
  • Accepted : 2018.07.01
  • Published : 2018.11.01

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.

Acknowledgement

Supported by : China Postdoctoral Science Foundation, HuNan University of Science and Technology, Hunan Provincial Department of Education Science

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