Fault estimation for a class of dynamic systems with external disturbance and actuator fault based on H_∞ adaptive observer

摘要

In this paper, considering a class of dynamic systems with external disturbances and actuator faults, a novel observer which can estimate the state and the fault signal simultaneously is proposed. The estimation technology is applicable for the linear system with actuator fault and nonlinear system with Lipschitz conditions. Firstly, the sufficient existences conditions of the observer are discussed; then the structure of the fault observer is constructed to enhance the performance of fault estimation, the H_∞ performance robust to the external disturbances is guaranteed through Lyapunov approach. Finally, the numerical simulation results demonstrate the effectiveness of the proposed method.