Chapter 4 - Fault-tolerant attitude control with actuator saturation

Abstract

In this chapter the attitude fault-tolerant control problem of spacecraft with loss of actuator effectiveness fault and actuator saturation is addressed. A sliding-mode control approach is presented to asymptotically stabilize the attitude of flexible spacecraft. Then a dynamic sliding-mode-based attitude fault-tolerant stabilization controller is designed. Finally, an active attitude fault-tolerant control approach is developed. In this approach, a nonlinear observer is presented and incorporated to estimate the partial loss of actuator effectiveness. Invoking the estimated information, a backstepping fault-tolerant control law is synthesized. The closed-loop attitude system is governed to be uniformly ultimately bounded stable. Simulation results are presented to validate the effectiveness of those developed fault-tolerant controllers.