卫星转动部件不平衡性的建模及分析

Modeling and Analysis of the Unbalance of Satellite Rotating Parts

针对采用反作用飞轮作为执行机构的高精度指向卫星,卫星转动部件在运行状态下由于不平衡性出现的高频振动,容易引起星体抖动,严重影响卫星的指向精度。为了分析产生的高频抖动对高精度指向卫星的影响,星上转动部件以反作用飞轮为例,首先介绍了反作用飞轮的工作原理;其次在建立反作用飞轮扰动的经验模型和分析模型的基础上,为了克服前两种模型的缺点,又在分析模型中加入高次谐波,得到包含高次谐波扰动和轴承柔性的扩展模型;最后通过设计控制律,对卫星姿态机动进行控制,并进行了MATLAB仿真算例,得出在实际控制系统设计中扩展模型是一种更有效的扰动模型的结论。

In view of the high precision pointing to the satellite,the reaction wheel is used as anactuator,the high frequency vibration of the satellite is easily caused by the unbalance of the rotating parts,which seriously affects the precision of the satellite＇s pointing accuracy.In order to analyze the influence of the high frequency jitter on the satellite,the rotating parts of the satellite are taking the reaction wheel as an example.Firstly,the working principle of reaction wheel is introduced.Secondly on the basis for the establishment of a reaction wheel disturbance of experience model and analysis model,in order to overcome the shortcomings of the former two models and in the analysis model with higher harmonic,contain harmonic disturbance and bearing flexible expansion model.Finally,the control law is designed to control the attitude maneuver of the satellite,and the MATLAB simulation examples are carried out,and the conclusion is drawn that the extended model is a more effective disturbance model in the design of the actual control system.