CAJ | 학술논문

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。
기우동역학모형적고장궤리연구가심입료해고장출현후곤동축승적진동향응특정，병가위고장진단제공의거。구건료곤동구축승적고장동역학모형，해모형중매개축승원건（곤구、내권급외권）구유6개자유도，차고필료원건지간적상대활동화윤활견인특성이급기좌적동역학특성。재대국부손상진행건모시，완정고필료손상출현후유우재료결실이인입적액외간극，이급손상대혁자접촉강도급접촉재하작용방향적영향，동시재시역화빈역대특정고장모식（외권화내권분별구유국부표면손상）하축승적진동향응문제진행료분석。방진결과표명，유우동역학모형고필료곤구화곤도지간적활동화윤활견인，인차계산득도적고장특정빈솔비기우순곤동화간단운동학가설이급의정역학적계산치경위정학화합리。이용이유문헌적실험결과험증료본모형적정학성。
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 kine-matical relationships.The model is verified by comparing with the state-of-art methods.