驱动激励下的柔性太阳翼系统振动及抑制研究

Research on Vibration and Its Attenuation of Flexible Solar Array Induced by Sun-tracking Driving

针对太阳翼驱动机构不平稳激励所引起的系统振动问题,分析了驱动激励下柔性太阳翼系统振动响应,发现刚柔耦合作用会大大增强系统在驱动作用下的微弱振动。指出旋转运动控制是太阳翼系统振动控制的关键,提出了一种在驱动机构与太阳翼之间安装旋转磁流变阻尼器的系统振动抑制方案,以振动干扰抑制为控制目标。运用PID算法计算旋转运动控制的阻尼力矩需求,定量地研究了旋转振动控制对柔性太阳翼系统振动抑制效果。仿真结果表明:旋转振动控制能使系统振动的干扰力矩衰减达89%,有效抑制驱动激励下的太阳翼系统振动,对提高航天器的运行稳定性及定位精度具有重要意义。

Aiming at the solar array micro-vibration caused by the unstable sun-driving torque of the solar array driving assembly,a flexible solar array system was investigated.The response of the flex-ible solar array was analyzed under driving excitation.It was found that the system vibration was sig-nificantly strengthened by the rigid-flexible coupling.The rotational motion control was crucial to the system vibration attenuation.A vibration suppression approach was proposed with a rotary magneto-rheological damper assembled between the solar array driving system and the solar array.The PID algorithm with the control objective of disturbance torque suppression was utilized to calculate the de-sired damping torque on the rotational motion control.Then the solar array system vibration attenua-tion by rotational motion control was quantitatively analyzed.The results showed that the vibration disturbance was decreased by89%on average with rotational motion control.The solar array system vibration caused by driving was suppressed effectively.It is of great significance to improve the sta-bility and pointing accuracy of spacecraft.