滑动轴承运行模态参数理论分析及试验验证  

Theoretical Analysis and Experimental Verification of Operating Modal Parameters of Journal Bearing

作　　者：王全召 陈阳 张浩[1] 甄冬[1] 师占群[1] WANG Quanzhao;CHEN Yang;ZHANG Hao;ZHEN Dong;SHI Zhanqun(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]河北工业大学机械工程学院,天津300130

出　　处：《润滑与密封》2021年第7期95-101,共7页Lubrication Engineering

基　　金：国家自然科学基金项目(51705127,51875166)。

摘　　要：滑动轴承的模态参数是其状态监测的重要指标,而轴承表面的磨损、润滑条件以及工作条件对轴承的模态参数有很大影响。为有效监测滑动轴承运行模态参数从而实现其早期故障检测,建立滑动轴承动力学模型并用复模态分析方法提取出系统的模态参数,研究滑动轴承的润滑油与轴承表面的作用诱导高频振动的机制,分析转速、载荷和润滑剂黏度对模态参数的影响,并进行实验验证。结果表明:轴承的润滑对于系统的高频振动有很大的影响;油膜刚度较高时,受润滑影响的模态阶数较少,并且转速的提高会导致固有频率先升高后降低;高频带范围内随着载荷增大振幅增大,低频带内润滑剂黏度增加模态频率降低。The modal parameter of journal bearing is an important index for its condition monitoring,while the wear of the bearing surface,lubrication and working conditions have great influence on the modal parameters of the bearing.In order to monitor the operating modal parameters of the journal bearing effectively and realize the early fault diagnosis,the dynamic model of journal bearing was established and the modal parameters of the system were extracted by the method of complex modal analysis.The mechanism of high frequency vibration induced by the interaction between lubricating oil and bearing surface was studied.The effects of speed,load and lubricant viscosity on modal parameters were analyzed and verified by experiments.The results show that the lubrication of bearing has a great influence on high frequency vibration.When the stiffness of oil film is high,the mode order affected by lubrication is less,and the natural frequency is increased first and then decreased with the increase of rotation speed.The amplitude is increased with the increase of load in the high frequency band,while the modal frequency is decreased with the increase of the viscosity of lubricant in low frequency band.

关 键 词：滑动轴承 频响函数 模态参数 实验模态分析 

分 类 号：TH117[机械工程—机械设计及理论]