An anti-disturbance PD control scheme for attitude control and stabilization of flexible spacecrafts
An anti-disturbance PD control scheme for attitude control and stabilization of flexible spacecrafts
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DOI：
10.1007/s11071-011-0130-3
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发表时间：
2012-02
影响因子：
5.6
通讯作者：
Hua Liu;Lei Guo;Yumin Zhang
中科院分区：
文献类型：
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作者：
Hua Liu;Lei Guo;Yumin Zhang
研究了柔性附件航天器的姿态控制问题。众所周知，柔性航天器姿态控制系统的不良振动模式、模型不确定性和空间环境干扰会导致姿态控制系统性能的下降。本文将柔性附件的振动建模为对刚性轮毂姿态控制系统的微分有界扰动。提出了一种基于扰动观测器的弹性振动前馈补偿控制方法。模型的不确定性和空间环境扰动以及其他噪声被合并为一个“等效”扰动。将DOBC控制与PD控制相结合，设计了一种层次结构的复合控制器，其中DOBC用于抑制柔性附件的振动效应。数值仿真结果表明，采用复合层次控制律可以有效地减弱扰动，提高系统的鲁棒动态性能。
This paper studies the attitude control problem of spacecrafts with flexible appendages. It is well known that the unwanted vibration modes, model uncertainty and space environmental disturbances may cause degradation of the performance of attitude control systems for a flexible spacecraft. In this paper, the vibration from flexible appendages is modeled as a derivative-bounded disturbance to the attitude control system of the rigid hub. A disturbance-observer-based control (DOBC) is formulated for feedforward compensation of the elastic vibration. The model uncertainty and space environmental disturbances as well as other noises are merged into an “equivalent” disturbance. We design a composite controller with a hierarchical architecture by combining DOBC and PD control, where DOBC is used to reject the vibration effect from the flexible appendages. Numerical simulations are performed to demonstrate that by using the composite hierarchical control law, disturbances can be effectively attenuated and the robust dynamic performances be enhanced.