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本文针对一类微纳卫星姿态控制系统飞轮突变故障提出了一种具有干扰抑制和补偿能力的精细故障诊断及容错控制方法.针对反作用飞轮的突变故障,本文不仅考虑了星体转动惯量变化导致的系统参数不确定性,而且考虑了姿态控制系统中飞轮振动带来的干扰影响,设计基于干扰观测器和故障诊断观测器的复合抗干扰容错控制器,并基于线性矩阵不等式对控制器进行求解,使复合系统稳定并满足一定的鲁棒H∞性能.仿真结果表明,基于微纳卫星姿态控制系统的精细故障诊断方法在有效诊断系统时变故障的同时,可有效抵消与抑制干扰.
In this paper, we present a fault diagnosis and fault tolerant control method for a class of fly-wheel catastrophe in a micro-nano satellite attitude control system. In order to deal with the catastrophic failure of a reactive flywheel, we consider not only the system caused by the change of the inertia of the star, Parameter uncertainties are considered. The influence of flywheel vibration in attitude control system is considered. A composite anti-interference and fault-tolerant controller based on disturbance observer and fault diagnosis observer is designed. The controller is solved based on linear matrix inequalities. The hybrid system is stable and satisfies a certain robust H∞ performance.The simulation results show that the fine fault diagnosis method based on the attitude control system of micro-nano satellite can effectively eliminate and suppress the interference while effectively diagnosing the system time-varying fault.