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针对卫星控制系统执行器故障,考虑干扰与不确定性影响,设计了一种自适应模糊滑模容错控制器(AFSMC)。首先,将执行器故障、干扰以及模型不确定性统一描述为系统的广义总干扰;然后,为使系统能够在有限时间内快速稳定且避免奇异,设计了非奇异快速终端滑模控制器(NFTSMC);其次,针对滑模系统固有的抖振现象,设计了自适应算法对系统广义总干扰进行补偿,减小了切换增益,并以自适应模糊系统逼近切换函数,柔化了输入信号,从而有效削弱了系统抖振,大大提高了控制精度;最后,对所提方法进行了数值仿真验证。
Aiming at the fault of actuator in satellite control system and considering the influence of interference and uncertainty, an adaptive fuzzy sliding mode fault tolerant controller (AFSMC) is designed. First, actuator failures, disturbances and model uncertainties are uniformly described as generalized total disturbances of the system. Then, to make the system robust and singularly fast in a finite time, a non-singular fast terminal sliding mode controller (NFTSMC Secondly, aiming at the chattering phenomenon inherent in sliding mode system, an adaptive algorithm is designed to compensate the generalized total disturbance of the system to reduce the switching gain. The adaptive fuzzy system approximates the switching function and softens the input signal Which effectively weakens the chattering of the system and greatly improves the control accuracy. Finally, the numerical simulation of the proposed method is validated.