【作者】 杨建国； 周仁魁； 刘朝晖； 李治国；

【Author】 YANG Jianguo~(1,2),ZHOU Renkui~1,LIU Zhaohui~1,LI Zhiguo~(1,2) (1 Xi’an Institute of Optics and Precision Mechanics of CAS,Xi’an 710119,China) (2 Graduate University of Chinese Academy of Sciences,Beijing 100039,China)

【机构】 中国科学院西安光学精密机械研究所光电跟踪与测量室； 中国科学院研究生院；

【摘要】 航天器发射过程中恶劣的力学环境,将会诱发其转子系统轴承的非线性效应。文章通过将轴承的非线性接触近似为线性分段弹簧的光滑缝接,在不同载荷冲击下,弹簧表现出不同的接触共振频率,从而解释了转子系统扫频试验中0.5g和1g载荷下的次谐振峰向低频漂移的现象。同时作者提出航天发射过程中,力学冲击在高低载荷范围内是随机的,因此转子接触共振将会产生随机的共振频率带,其响应将会随着载荷的变化而在频率带内漂移。根据轴承的非线性特性,文章最后提出了通过调整轴承预紧力转移接触共振频率带、添加转子径向支撑减小惯量冲击和对结构详细分析提高受载可靠性等方法,为非线性转子系统的设计及早期故障诊断提供了理论和方法支持。更多还原

【Abstract】 The nonlinear effect will be excitated under the cruel dynamical circumstance in the space field,that a contact approximate model for the bearing is brought forward.With different load,the linear springs conjunction will represent corresponding contact resonance frequency.Which provide a explanation for the resnance frequency shift under 0.5g and 1g loads in the experiment.In the locale launch, vibration loaded on the rotor is stochastic but under the maximal force,so that the rotor will response in a contact frequency band.According to the nonlinear characteristic of the bearing,methods are expatiated for the rotor system design and fault diagnoses,which are shifting frequency band by adjusting axial compressive force,reducing concussion by adding support in the radial direction,and enhancing the support capability by detailed analysis on the structure.更多还原