基于输入成型法的空间站变构型过程挠性振动抑制策略

针对空间站组合体变构型引起的挠性附件振动问题,将航天器大角度机动中用于抑制挠性振动的输入成型思想引入到变构型过程中,提出一种新的变构型策略。首先根据拟坐标拉格朗日方程建立组合体变构型动力学模型,然后采用零振动和零微分法(ZVD)和级联法求出变构型系统的输入成型模型,最后根据初始变构型策略的特点和期望构型的约束确定新的变构型策略。将基于输入成型的变构型策略应用于组合体变构型时,仿真结果表明,由变构型引起的挠性振动得到显著抑制,各阶振动的最大振幅可以抑制到原来的10%～20%,对低阶振动抑制效果尤为明显。

Research on Flexible Vibration Suppression Strategy for Variable Configuration Space Station Based on Input Shaping Technique

Aiming at reducing flexible vibrations in process of configuration change of a space station, an innovative strategy is proposed based on an input shaping technique generally used in spacecraft maneuvering. The dynamics model of a space station with variable configurations is established based on quasi coordinate Lagrange equations. Zero Vibration and Derivative (ZVD) and cascade method are employed to derive the input shaping model for the system; the new configuration change strategy is finally obtained according to the characteristics of the original strategy and the desired configuration. By applying the ameliorated strategy to the configuration change process, simulation results show that flexible vibrations are suppressed remarkably, and each modes’ maximum vibration magnitudes are suppressed to 10%~20% of the original ones. Particularly, the suppression is more effective for lower flexible modes.