基于自适应模糊估计器的卫星容错控制系统  

An Adaptive Fuzzy Estimator-Based Satellite Fault-Tolerant Control System

作　　者：梁津津[1] 王青[1] 董朝阳[1] 

机构地区：[1]北京航空航天大学自动化科学与电气工程学院,北京100191

出　　处：《宇航学报》2010年第8期1970-1975,共6页Journal of Astronautics

摘　　要：针对姿态控制系统出现故障对卫星稳定性和控制性能的不利影响,本文提出了一种基于自适应模糊故障估计器的全局动态滑模变结构容错控制算法。设计了一个自适应模糊估计器对系统中的故障函数在线进行估计,通过将估计所得的故障函数引入控制律中,对未知故障进行补偿。为了使得系统响应对外部干扰具有全局鲁棒性,本文为控制器设计了一种全局动态滑模面。采用Lyapunov方法证明了在线故障估计器和控制器的稳定性,并通过仿真进行了验证。仿真结果表明,故障估计器能够很好地对故障进行估计,保证控制器在故障情况下具有良好的动态性能;控制器对某卫星具有良好的控制精度,并且对外界干扰有较强的鲁棒性。An adaptive fuzzy fault-estimator-based global dynamic sliding mode fault-tolerant control（GDSMFTC） algorithm to solve the fault-tolerant problems of a satellite is proposed in the paper.This estimator can estimate a fault occurred in the system and help the controller to eliminate the effect of the fault.And then a global dynamic sliding mode surface is designed to make sure that the response of the system has global robustness against to the uncertainties of system and external disturbances.The stability of the controller and the fault-estimator is proved by Lyapunov theory and verified by a numerical simulation.The simulation results show that the controller and the fault-estimator have high accuracy and robustness.The control system has well performance when fault occurs.

关 键 词：卫星 滑模控制 故障估计器 容错控制系统 

分 类 号：V448.22[航空宇航科学与技术—飞行器设计]