大型柔性空间结构的状态估计及变结构控制

STATE ESTIMATION AND VARIABLE STRUCTURE CONTROL OF FLEXIBLE SPACECRAFTS

本文研究大型柔性空间结构作单轴大角度操纵时的状态估计及变结构控制方法。所建立指数律的状态观测器,实现了以较少传感器估计系统弹性振动模态的目的。利用状态观测器的状态及系统输出变量反馈方法,设计了大型空间结构的动态输出变结构控制律。针对一个实际模型仿真计算,得到了满意的结果。

In this paper,an approach of state estimation and a variable structure control strategy are presented for large-angle single-axis maneuvers of flexible spacecrafts.An exponential observer based on fewer sensors is constructed so that elastic modes of the systems can be available at all instants.Furthermore,dynamic output feedback variable structure control using outputs of the system and states of the observer is studied.Satisfactory simulation results obtained for a practical model are also given.