基于PWM的挠性航天器分力合成主动振动抑制方法

Component Synthesis Active Vibration Suppression Method of Flexible Spacecraft Based on PWM

分力合成主动振动抑制方法可以有效抑制挠性振动.其利用几个相同或相似的随时间变化的分力,按一定的规律沿时间轴排列合成为合力作为系统输入,此合力可以在保证完成规定刚体运动的同时抑制掉指定的任意阶振动谐波.对于使用常幅值力矩喷气执行机构的航天器,应用脉宽调制(PWM)技术将符合分力合成方法的时间最优机动控制指令变化为常幅值力矩形式,设计出常幅值的时间最优大角度机动策略.数值仿真结果证实了方法的有效性.

The Component Synthesis active Vibration Suppression method （CSVS） can be applied to suppress the vibrations of flexible systems. In this method, several same or similar time-varying component forces are arranged according to certain rules along the time axis. The resulted synthesized force can be adopted as system input, and it can suppress the arbitrary unwanted vibration harmonics while achieving the desired rigid body motion. For a kind of spacecrafts with constant amplitude reaction jet actuators, the time optimal maneuver control commands corresponded with the roles of CSVS method were converted into form of constant amplitude torque using Pulse Width Modulation （PWM）. The time optimal large maneuver control strategies are designed as well. Simulation results verified the availability of this method.