摘要
基于动力学模型的故障机理研究可深入了解故障出现后滚动轴承的振动响应特征,并可为故障诊断提供依据。构建了滚动球轴承的故障动力学模型,该模型中每个轴承元件(滚球、内圈及外圈)具有6个自由度,且考虑了元件之间的相对滑动和润滑牵引特性以及基座的动力学特性。在对局部损伤进行建模时,完整考虑了损伤出现后由于材料缺失而引入的额外间隙,以及损伤对赫兹接触刚度及接触载荷作用方向的影响,同时在时域和频域对特定故障模式(外圈和内圈分别具有局部表面损伤)下轴承的振动响应问题进行了分析。仿真结果表明,由于动力学模型考虑了滚球和滚道之间的滑动和润滑牵引,因此计算得到的故障特征频率比基于纯滚动和简单运动学假设以及拟静力学的计算值更为精确和合理。利用已有文献的实验结果验证了本模型的正确性。
Dynamic model based fault mechanism analysis can be used to investigate vibration responses of rolling bearings with faults deeply, and provide foundations for fault detections and diagnosis. A dynamic model of rolling ball bearing with localized surface defects is proposed. In this model, each bearing component （i. e. , ball, inner raceway and outer raceway） has six degrees of freedom, and the relative slippage and tractive forces between balls and raceways are also taken into account. Moreover, de- fects are modeled completely with consideration of additional clearance due to material absence, changes of Hertzian contact stiff ness and contact force directions. Vibration responses of a ball bearing with different fault patterns （i. e. , outer raceway fault and inner raceway fault） are analyzed in both time domain and frequency domain. Simulation results show that the fault frequencies obtained by dynamic model are more accurate and reasonable than the ones obtained based on quasi-static analysis and simple kinematical relationships. The model is verified by comparing with the state-of-art methods.
出处
《中国科技论文》
CAS
北大核心
2014年第8期902-907,共6页
China Sciencepaper
基金
高等学校博士学科点专项科研基金资助项目(20110201120029)
国家自然科学基金资助项目(51035007
51105294)
关键词
滚动轴承
动力学模型
损伤
故障诊断
故障机理
rolling bearing
dynamic models
defects
fault diagnosis
fault mechanism
