控制力矩陀螺力学试验后的微振动特性变化  

Microvibration Characteristics Variation of Control Moment Gyroscope Subjected to Mechanical Tests

作　　者：王晓伟[1,2] 翟百臣[1] 罗睿智[1] 关新[1,3] 

机构地区：[1]北京控制工程研究所,北京100190 [2]空间轴承应用技术实验室,北京100190 [3]空间智能控制技术重点实验室,北京100190

出　　处：《空间控制技术与应用》2015年第2期46-50,56,共6页Aerospace Control and Application

基　　金：国家高新技术研究发展计划(863)资助项目(2008AA121002);国家自然科学基金资助项目(11402019)

摘　　要：控制力矩陀螺是一种用于航天器姿态机动和稳定的重要执行机构.为掌握控制力矩陀螺力学试验后的微振动特性变化,用加速度传感器测量其工作状态下的加速度响应,用多分量测力计测量其工作状态下的力和力矩响应,并进行时域统计分析和频域FFT分析.结果表明,轴承偏心和点状缺陷引起的通过频率成分及其倍频成分是加速度响应的主要成分,但皆位于300 Hz以上的高频区,如果将加速度响应转换成位移响应,则转子标称转速频率成分仍占主导,力和力矩响应结果也验证了该论断.力学试验使控制力矩陀螺微振动恶化,主要原因是静、动不平衡量变大、轴承偏心变大和轴承受损.此外,转子转速和结构模态的动力耦合也会影响微振动幅值.Control moment gyroscope（CMG） is an actuator which plays an important role in agile attitude maneuvering and in steadily attitude maintaining of spacecraft. In order to recognize the mierovibration characteristics variation of the CMG subjected to mechanical tests, the acceleration responses and force- moment responses are measured via accelerometers and multi-component dynamometer respectively, when the CMG is operating. Then, statistical analysis in time domain and FFT analysis in frequency domain are implemented. The results show that the components of ball passage frequencies and those multiples, which are caused by the eccentricity and point defects of bearings, dominate the acceleration responses, but they are all over 300 Hz. However, the component of nominal frequency of rotor spin still dominates when acceleration responses are converted into displacement responses, which is also confirmed by force- moment responses. The microvibration of the CMG subjected to mechanical tests becomes worse, which mainly results from the augmentation of the static and dynamic imbalances, from the augmentation of the eccentricity of bearings, and from the damage to bearings. Furthermore, the microvibration amplitude can be also impacted by the dynamic coupling between rotor speeds and structure modes.

关 键 词：控制力矩陀螺 轴承 微振动 力学试验 

分 类 号：V448[航空宇航科学与技术—飞行器设计]