An adaptive actuator failure compensation scheme is proposed for attitude tracking control of spacecraft with unknown disturbances and uncertain actuator failures. A new feature of this adaptive control scheme is the adaptation of the failure pattern parameter estimates, as well as the failure signal parameter estimates, for direct adaptive actuator failure compensation. Based on an adaptive backstepping control design, the estimates of the disturbance parameters are used to solve the disturbance rejection problem. Without the requirement of additional fault detection mechanism, the switching function is designed to automatically locate and turn off the unknown faulty actuators by observing a control performance index. The asymptotic stability of the system output in the presence of actuator failures is rigidly proved through standard Lyapunov approach, while the other signals of the closed-loop system are guaranteed to be bounded. Simulation results verify the desired adaptive actuator failure compensation performance.

中文翻译：

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航天器自适应执行器故障补偿和抗扰方案

针对未知扰动和不确定致动器故障的航天器姿态跟踪控制，提出了一种自适应致动器故障补偿方案。这种自适应控制方案的一个新特征是故障模式参数估计以及故障信号参数估计的自适应，用于直接自适应执行器故障补偿。基于自适应反步控制设计，干扰参数的估计用于解决干扰抑制问题。无需额外的故障检测机制，开关功能旨在通过观察控制性能指标自动定位和关闭未知故障执行器。通过标准的李雅普诺夫方法严格证明了系统输出在执行器故障时的渐近稳定性，同时保证闭环系统的其他信号是有界的。仿真结果验证了所需的自适应执行器故障补偿性能。