挠性卫星快速机动复合控制

Combined Control for Quick Maneuver of Elastic Satellite

文章给出了挠性卫星快速机动复合控制方法,包括前馈和反馈控制。反馈控制消除姿态误差,使得本体完成姿态机动目标;前馈控制柔化和优化参考输入,规避挠性振动。反馈控制采用经典PD控制,而前馈控制采用正弦优化控制。正弦优化控制通过优化正弦序列系数,能同时抑制大量挠性振动(包括低阶和高阶模态)。最后,文章对该复合控制方法进行了数学仿真,结果表明:在动力学不确定性和外界干扰存在的情况下,该方法仍能有效完成姿态快速机动,同时抑制最后的残余振动达到合理的水平。

A combined control method which consists of feedback control and feedforward control was presented. The feedback loop eliminates rigid body＇s attitude error around target attitude, while feedforward control prevents from elastic vibration. For feedback loop, the traditional PD control was adopted. For feedforward control, the suboptimal sinusoidal control was adopted. Suboptimal sinusoidal control consists of series of sinusoids exciting little vibration of elastic modes from low order to high order. Numerical simulation was carried out to verify the method. The results show that, by using the combined control, the maneuver task can be fulfilled effectively in the presence of dynamical uncertainties and disturbance.