Fault-Tolerant Tracking Control and Remaining Useful Life Estimation for Takagi-Sugeno fuzzy system

Abstract

The paper proposes a robust observer-based fault-tolerant tracking control scheme for Takagi-Sugeno fuzzy systems along with its actuator remaining useful life estimation. The difficulty lies in the fact that the system can be occupied by an external disturbances as well as the sensor and actuator faults. A robust stability of the proposed observer and controller is guaranteed by using a quadratic boundedness approach, which uses a simplifying assumption stating that an external disturbances are bounded by an ellipsoid. Subsequently, the actuator remaining useful life scheme for the faulty actuator is developed. Finally, a Takagi-Sugeno fuzzy model of the twin-rotor laboratory system is used to verify the correctness and performance of the proposed strategy.