辐条式高速转子轴向挠性振动特性

Axial Flexible Vibration Characteristics of High Speed Spoked Rotors in Inertia Actuator

惯性执行机构高速转子轴向挠性振动所诱发的干扰会对高精度、高稳定度的航天器造成不利的影响。为了使这种影响尽可能地降到最低,需要研究高速转子的挠性振动模型。在转子发生轴向挠性振动的过程中,可以将转子的辐条看作是一端固定、一端有集中质量的悬臂梁。文章通过这种方法建立了辐条式转子的轴向挠性振动模型并对转子的轴向挠性振动特性进行了分析。结果表明,当外加激励的频率等于转子的固有频率时,将诱发转子产生大幅的轴向挠性振动。此外,满载精度要求较高的情况下,可以通过能量法建立转子的轴向挠性振动模型,从而提高模型的精度。

The disturbances generated from axial flexible vibration of the high speed rotor of the inertia actuator will have a bad effect on the precision and the stability of the spacecrate attitude control. The model of the flexible vibration must be set up to decrease the disturbances of the high speed rotor. The spoke of the rotor can be regarded as the cantilever beam with a fixed end and a lumped mass end. Thus the model of the flexible vibration was obtained, and the characteristics of the flexible vibration of the rotor were analyzed. The results show that the violent flexible vibration will happen if the motivation frequency equals to the natural frequency of the rotor. Moreover, the energy method can be used to increase the precision of the model.