Active FTC approach design for a class of nonlinear flight control systems with actuator faults

摘要

In this paper, an active fault tolerant controller is designed for a class of nonlinear flight control systems with bounded external disturbances and unknown actuator effectiveness loss faults. Firstly, the nonlinear flight control system models of an aircraft are given. When some actuators occur the unknown loss of effectiveness faults, the faulty flight control systems is further established. To obtain the accurately fault estimated value, an adaptive fault estimation observer is designed for the faulty flight control systems. Then, an active fault tolerant controller design approach is proposed by using terminal sliding mode technique and the obtained estimated value of unknown actuator fault, which could asymptotically accommodate the effects of actuator faults and guarantees the stability of the closed-loop flight control systems in the case of actuator loss of effectiveness faults. Finally, these results in simulation indicate the efficiency of our presented fault tolerant control (FTC) scheme.