悬臂式SGCMG的高速转子的径向振动特性研究

悬臂式单框架控制力矩陀螺(SGCMG)的高速转子在运行过程中将会激发复杂的微幅高频振动,迄今对SGCMG的这种振动特性的认识既不准确也不完整。首先,在线性假设的基础上分析了径向振动的来源——静动不平衡量所产生的离心力和力偶以及预紧轴承滚动面的几何误差产生的预紧力的波动;其次,在结构的基础上利用分析力学的方法得到了悬臂式高速转子的径向振动模型——相互耦合的二阶常微分方程组;最后,通过数值仿真和测试结果的对比验证了分析的合理性和模型的有效性。

Radial Vibration Characteristic of Cantilever SGCMG High-Speed Rotor

High-frequency vibrations excited by the high-speed rotor of the cantilever Single Gimbal Control Moment Gyroscope (SGCMG) have many negative effects on the attitude stability and other performances of some spacecrafts，for instance, an agile small satellite. And the severe jitter includes some complex frequency components and reveals complicated dynamic characteristics, rendering it difficult to suppress thoroughly and to perceive exactly. Firstly, under the linear assumption, the exciting sources for high-speed rotor vibration were analyzed, who derive from the static unbalance and dynamic unbalance and the geometrical errors of preloading bearing rolling elements. Secondly, the vibration dynamics models of the cantilever high-speed rotor in the SGCMG were established based on its structure using the analytic mechanics theory- a set of coupled second order ordinary differential equations. Finally, the facts that the analysis is reasonable and these models are feasible were verified by comparing the results of the numerical simulation based on the models and the vibration test for a high-speed rotor of a cantilever SGCMG.