Systems Engineering and Electronics ›› 2023, Vol. 45 ›› Issue (7): 2183-2191.doi: 10.12305/j.issn.1001-506X.2023.07.29

• Guidance, Navigation and Control • Previous Articles     Next Articles

Robust sliding mode observer design for nonlinear system with measurement noise and multiple faults

Cong LIU1,*, Kaijun LIAO1, Kun QIAN1, Yinghui LI2, Qi DING1   

  1. 1. School of Aeronautics Maintenance Noncommissioned Officers, Air Force Engineering University, Xinyang 464000, China
    2. Aeronautics Engineering College, Air Force Engineering University, Xi'an 710038, China
  • Received:2022-01-12 Online:2023-06-30 Published:2023-07-11
  • Contact: Cong LIU

Abstract:

An absolute decoupled robust sliding mode observer design method for fault reconstruction is proposed, which is used for a class of nonlinear system with multiple faults(actuator faults and sensor faults existing simultaneously) and measurement noise. Firstly, the sensor faults and measurement noise are taken as the parts of augmented state vector to build the descriptor system, and the robust descriptor sliding mode observer is designed. Then considering the case that Lipschitz coefficient and upper bound of faults are unknown, the design algorithm with the adaptive law is proposed. Besides, the auxiliary matrix and descriptor constrained inverse matrix are introduced to design the coefficient matrix of observer, which is used for decoupling the faults from disturbances. Meanwhile, the gain matrix design method of observer is proposed through linear matrix inequality. Finally, the sliding mode differentiator is provided, and the actuator and sensor fault reconstructed results are given. The simulation is given to demonstrate the effectiveness of the proposed method.

Key words: multiple faults, sliding mode observer, fault reconstruction, adaptive, robust

CLC Number: 

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