基于非理想Hertz线接触特性的圆柱滚子轴承局部故障动力学建模  

Dynamic Modeling on Localized Defect of Cylindrical Roller Bearing Based on Non-Hertz Line Contact Characteristics

作　　者：刘静[1] 邵毅敏[1] 秦晓猛[1] 周俭基[1] 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400044

出　　处：《机械工程学报》2014年第1期91-97,共7页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51035008);国家'十二五'科技支撑计划(2011BAF09B01)资助项目

摘　　要：传统方法对圆柱滚子轴承局部故障动力学的分析都是基于Hertz线接触理论,然而当轴承的滚子为凸度形状时,滚子素线不为直线,滚子与滚道之间的接触问题已经超出Hertz线接触理论的范畴。针对这个问题,以滚道表面存在局部故障的圆柱滚子轴承为研究对象,提出考虑滚动体与内外圈滚道之间非理想Hertz线接触特性和时变位移激励的圆柱滚子轴承局部故障动力学模型,研究位移激励形式和局部故障尺寸对圆柱滚子轴承振动特性的影响规律。研究表明,该模型能克服传统的线接触经验公式无法考虑滚子与滚道曲率的缺点,能更加准确反映圆柱滚子轴承滚道表面局部故障与滚动体接触的实际情况,为滚动轴承早期局部故障动力学分析和诊断工作提供新的计算方法和一些有价值的结论。The traditional analysis method for dynamic modeling a localized defect of a cylindrical roller bearing is based on Hertz line contact theory, however, the contact conditions between the roller and the races are not Hertz line contact since the roller profile is not straight line when its rollers are crowned. Hence, a new dynamic model of a cylindrical roller beating with a localized defect on its races is proposed, which considers the non-Hertz line contact characteristics between the roller and the races and the time-varying displacement impulse. The effects of the different displacement impulse functions and the defect sizes are investigated. The results show that the proposed method can consider the radius of curvature of the raceway and provide a more close to practical contact between the roller and the localized defect on the surface of the races of the cylindrical roller beating. It is also shown that the proposed method provides a new calculation method and some valuable conclusions for dynamic analysis and faults diagnosis of rolling element bearing.

关 键 词：圆柱滚子轴承 故障模型 非理想Hertz线接触 时变位移激励 动力学 

分 类 号：TH133[机械工程—机械制造及自动化]