柔性航天器大角度机动闭环开关序列控制

孔宪仁, 杨正贤, 廖俊, 张也弛

哈尔滨工业大学卫星技术研究所



摘要:

针对柔性航天器大角度姿态机动时柔性附件的振动抑制问题,提出了一种闭环脉冲序列控制方法.该方法利用姿态角和角速度作为反馈信号,分别使用喷气推力器、反作用飞轮完成姿态的粗、精控制,以实现航天器的快速大角度机动;同时,为实现平稳的机动过程,设计成形的喷气开关控制指令,以避免机动过程中推力器激起柔性结构的持续振动.全物理实验结果表明,该方法不仅使航天器完成姿态的机动,而且显著地减少了柔性结构的弹性振动,并且具有节省燃料、算法简单、易于在轨实时计算、工程可行性及有效性高的优点.

关键词:  柔性航天器  大角度机动  喷气开关控制  振动抑制  全物理实验

DOI：10.11918/j.issn.0367-6234.2011.11.003

分类号:V448.2

基金项目:国家自然科学基金资助项目(60904051)



Closed-form on-off control for large angle maneuver of flexible spacecraft

KONG Xian-ren, YANG Zheng-xian, LIAO Jun, ZHANG Ye-chi

Research Center of Satellite Technology,Harbin Institute of Technology,150080 Harbin,China

Abstract:

A closed-form pulse train control algorithm is presented for vibration suppression of flexible spacecraft during large angle maneuver.Based on attitude angle and angular velocity,the control algorithm uses thrusters for coarse attitude control and reaction wheels for high precision attitude control at the final stage of operations.The input shaping is introduced to modulate thruster pulses with a set of properly timed impulses to suppress vibrations introduced by on-off control.Physical experiment results demonstrate that the proposed approach can significantly reduce the vibration of flexible appendages during fast large angle maneuver,and the presented control algorithm has the advantages of less fuel consumption,as well as simplicity and efficiency for practical on-board computer operation.

Key words:  flexible spacecraft  large overall motions  on-off control  vibration suppression  physical experiment