Finite-time Adaptive Attitude Tracking Fault-tolerant Control for Spacecraft

Abstract

A finite-time adaptive attitude tracking fault-tolerant control method is proposed for non-rigid spacecraft with actuator fault, time-varying inertia and external disturbances. Firstly, based on the finite-time theory and adaptive approach, for overcoming the inertia uncertainties and rejecting the external disturbances, an adaptive system uncertainty estimation and disturbance estimation are designed to compensate the system respectively. Then, on the basis of fault-tolerant control scheme and double power method, an adaptive finite-time attitude tracking fault-tolerant control algorithm is proposed, and the practical finite-time stability of the system is proved via Lyapunov stability theory. Finally, numerical simulation is demonstrated. The result shows that the proposed finite-time control strategy is effective.

Keywords

• finite-time control
• non-rigid spacecraft
• actuator fault
• time-varying inertia
• external disturbances