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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。
Aiming at the high frequency chattering problem of flexible spacecraft sliding mode variable structure control torque brought by application switching function, an improved approach to the approaching rate is proposed. Firstly, the continuous saturation function is used to replace the sign function in the exponential approach rate. Second, the problem that the boundary layer thickness is fixed and can not reach the sliding mode surface is brought about for the saturation function. The modified index approach rate Adaptive intelligent processing. The control algorithm is applied to attitude maneuver control of flexible spacecraft. The mathematical simulation results show that this control algorithm can effectively suppress high frequency chattering of control torque and obtain good control effect.