This article investigates the robust fault tolerant control strategy for a rigid satellite attitude system with external disturbance and actuator fault while the predesigned output constraint is taken into consideration. Based on the interval observer technique, an identical faulty signal reconstruction is first realized by utilizing pure mathematical calculation. Then, to guarantee the desired output constraint, the proposed prescribed performance fault tolerant control framework is constructed with a novel error interval representation which not only reduces the computation burden but also simplifies the output constrained controller design. In addition, by comparing with the existing finite/fixed time control method, the setting time for this control strategy can be assigned freely. The stability of the whole method is guaranteed by Lyapunov method. Finally, simulation results including comparisons with existing work show the effectiveness and advantages of the proposed approach.

中文翻译：

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具有输出约束的刚性卫星姿态系统的鲁棒自由时间稳定容错控制

本文研究了具有外部干扰和执行器故障的刚性卫星姿态系统的鲁棒容错控制策略，同时考虑了预先设计的输出约束。基于区间观测器技术，首先利用纯数学计算实现了相同的故障信号重构。然后，为了保证所需的输出约束，所提出的规定性能容错控制框架构造有一种新颖的错误区间表示，这不仅减少了计算负担，而且简化了输出约束控制器的设计。此外，与现有的有限/固定时间控制方法相比，该控制策略的设定时间可以自由分配。整个方法的稳定性由李雅普诺夫方法保证。最后，包括与现有工作比较在内的仿真结果表明了所提出方法的有效性和优势。