分力合成和智能材料相结合的振动控制方法

针对采用喷气控制的挠性航天器大角度姿态机动的振动抑制问题,提出了一种将分力合成(CSVS)和基于分布式压电陶瓷元件(PZT)振动控制相结合的主动振动抑制方法.研究了将分力合成方法应用于闭环系统的控制.为了将CSVS方法应用于具有常幅值执行机构的系统,提出将PWPF调制与CSVS相结合的方法.为了进一步抑制挠性附件的残余振动,采用分布压电陶瓷元件(PZT)作为作动器,设计正位置反馈(PPF)补偿器,增加挠性结构振动模态的阻尼,使得挠性结构的振动在较短的时间内能够迅速衰减.最后,将该方法应用于挠性航天器的单轴rest-to-rest姿态机动控制,结果验证了该方法的可行性和有效性.

Vibration reduction of flexible spacecraft integrating CSVS with distributed piezoelectric actuators during attitude maneuver

The investigation is to apply the component synthesis vibration suppression(CSVS) method and distributed piezoelectric elements technology to the vibration control of a flexible spacecraft actuated by on-off thrusters during maneuvers.The proposed control system includes the attitude controller acting on the rigid hub,designed by the CSVS method based command shaping technique,and the uniform piezoelectric film elements bonded on the surface of the beam appendage,designed by positive position feedback(PPF) control strategy.To extend the CSVS method to the system with the on-off actuators,the pulse-width pulse-frequency(PWPF) modulation is introduced to control the thruster firing and integrated with the CSVS method for reducing the relatively large amplitude vibrations excited by rapid maneuvers.Through CSVS method,an additional independent flexible control system acting on the flexible parts using piezoelectric actuators,which are more suitable for suppression of micro-vibrations can be designed for further vibration reduction.The hybrid control system can improve the performance of the vibration control in both the macro-and microsenses can result.Both analytical and numerical results are presented to show the advantages of this approach.