基于多体动力学的中介轴承局部缺陷故障振动特性分析  

Analysis of vibration characteristics of inter-shaft bearing with local defects based on multi-body dynamics

作　　者：田晶 艾辛平 张凤玲 王志 汪才 TIAN Jing;AI Xinping;ZHANG Fengling;WANG Zhi;WANG Cai(Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System,School of Aero-engine,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]沈阳航空航天大学航空发动机学院辽宁省航空推进系统先进测试技术重点实验室,沈阳110136

出　　处：《航空动力学报》2024年第8期238-248,共11页Journal of Aerospace Power

基　　金：国家自然科学基金(12172231);辽宁省博士科研启动基金(2020-BS-174);辽宁省教育厅项目(JYT2020019)。

摘　　要：为研究中介轴承存在局部缺陷时的振动特性及接触应力,基于多体动力学方法建立了中介轴承单点及复合故障二维全柔性动力学模型。应用该模型分析了中介轴承存在局部缺陷时的时频分布特性及接触应力变化规律,并与基于非线性Hertz接触理论的集中参数模型和实验测试结果进行对比分析,验证了多体动力学模型的准确性。研究结果表明:依据所建模型求得的故障特征频率与集中参数模型和实验结果误差均小于1%。轴承的等效应力最大值出现在故障裂痕处,且向四周扩散并减小;轴承承载区内的应力明显高于非承载区,应力变化的时间间隔为中介轴承故障特征频率基频的倒数。In order to study the vibration characteristics and contact stress of an inter-shaft bearing with local defects,a two-dimensional fully flexible dynamic model of the inter-shaft bearing with single and compound faults was established based on the multi-body dynamics method.With this model,the timefrequency distribution characteristics and contact stress variation law of the inter-shaft bearing with local defects were analyzed.Compared with the lumped parameter model based on nonlinear Hertz contact theory and the experimental results,the accuracy of the multi-body dynamics model was verified.The research results showed that the error between the fault characteristic frequency obtained based on the established model and the lumped parameter model and the experimental results was less than 1%.The maximum value of the equivalent contact stress of the bearing appeared at the fault crack,spread around and reduced;the contact stress in the bearing area was significantly higher than that in the non bearing area,and the time interval of the change of the equivalent stress was the reciprocal of the fundamental frequency of the inter-shaft bearing fault characteristic frequency.

关 键 词：中介轴承 复合故障 多体动力学 接触应力 故障特征 

分 类 号：V232[航空宇航科学与技术—航空宇航推进理论与工程]