基于事件触发的航天器姿态自适应容错控制

针对航天器通信和计算资源约束以及执行器故障场景下的姿态控制问题，提出了一种基于事件触发的航天器姿态自适应容错控制策略。首先，采用自适应方法估计故障信息、外界扰动等系统中未知参数，并引入事件触发机制，在执行器故障下实现容错控制的同时，节约星载计算机的计算资源。然后，基于李雅普诺夫方法证明了所提出的控制策略保证了闭环系统状态全局一致且最终有界稳定，并能有效避免Zeno现象，保证了执行器故障场景下对姿态的精确控制。最后，应用于航天器的姿态稳定试验，仿真结果验证了该方法的有效性。

Event-Triggered Adaptive Fault-Tolerant Control of Spacecraft Attitude

An event-triggered adaptive fault-tolerant control strategy is proposed for spacecraft attitude control under the constraints of communication and computing resources and actuator failure scenarios. Firstly, the adaptive method is used to estimate the unknown parameters in the system, such as fault information and external disturbance, and the event-triggered mechanism is introduced to realize the fault-tolerant control under actuator fault and save the computing resources of the onboard computer. Then, based on the Lyapunov theory, it is proved that the proposed control strategy can ensure the global consistency and ultimate boundedness of the closed-loop system, effectively avoid the Zeno phenomenon, and guarantee the precise attitude control considering actuator failures. Finally, it is applied to the attitude stability test of the spacecraft, and the simulation results verify the effectiveness of the method.