摘要
针对应用切换函数带来的挠性航天器滑模变结构控制力矩的高频抖振问题,提出了一种趋近率的改进方法。首先应用连续的饱和函数替换指数趋近率中的符号函数,其次针对饱和函数带来了边界层厚度是固定值,无法到达滑模面的问题,应用模糊逻辑对改进后的指数趋近率进行自适应智能处理。将此控制算法应用于挠性航天器的姿态机动控制中,数学仿真结果表明此控制算法可以有效地抑制控制力矩的高频抖振,并获得良好的控制效果。
The problem of high frequency chattering of control torque is focused when the sliding mode vari- able structure （SMVS） of introducing sign function is used. Firstly, a means of using continuous function instead of sign function is proposed to improve the exponential approach law. Secondly, aiming at the prob- lem that the thickness of boundary layer is fixed value and can not reach the slide surface when the continu- ous function is used, the exponential approach law is optimized in time by fuzzy logic. This control algo- rithm is applied to the control of flexible spacecraft maneuvering. The simulation results show that the high frequency chattering of control torque is restrained effectively and the controller has good performance.
出处
《航天控制》
CSCD
北大核心
2013年第5期62-68,75,共8页
Aerospace Control
