中国科技核心期刊

中文核心期刊

CSCD来源期刊

空间控制技术与应用 ›› 2015, Vol. 41 ›› Issue (2): 46-50.

• 技术交流 • 上一篇    下一篇

控制力矩陀螺力学试验后的微振动特性变化

  

  • 出版日期:2015-04-21 发布日期:2015-04-27

Microvibration Characteristics Variation of Control Moment Gyroscope Subjected to Mechanical Tests

  • Online:2015-04-21 Published:2015-04-27

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.

关键词: 控制力矩陀螺, 轴承, 微振动, 力学试验

Abstract: 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 microvibration 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.

Key words: control moment gyroscope, bearing, microvibration, mechanical test