航天器有限时间自适应姿态跟踪容错控制

非刚体航天器存在时变的惯量、执行器完全失效或衰退故障以及外界干扰的情况,提出一种有限时间自适应姿态跟踪容错控制方法。首先,基于有限时间理论和自适应方法,设计惯量不确定性自适应估计项和外界干扰参数自适应估计项进行系统补偿,克服惯量不确定性和抑制外界干扰;然后,基于容错控制和双幂次方法,设计一种自适应有限时间姿态跟踪容错控制算法,并且利用Lyapunov稳定性理论证明所提算法能够保证航天器姿态跟踪系统实际有限时间稳定;最后,对仿真结果进行验证。结果表明:所提有限时间姿态跟踪容错控制方法是有效的。

Finite-time adaptive attitude tracking fault-tolerant control for spacecraft

This paper investigates a finite-time adaptive attitude tracking fault-tolerant control problem for non-rigid spacecraft with actuator fault, time-varying inertia and external disturbances, and proposes an adaptive finite-time attitude tracking fault-tolerant control algorithm. Based on the finite-time theory and adaptive approach, a controller is designed to guarantee that the actuator fault attitude tracking system is finite-time stable. Furthermore, for overcoming the inertia uncertainties and rejecting the external disturbances, an adaptive system uncertainty estimation and disturbance estimation were designed to compensate the system respectively. The practical finite-time stability of the system is proved via Lyapunov stability theory. Numerical simulation results demonstrate the effectiveness of the proposed finite-time control strategy.