滚动轴承复合故障振动建模及Lempel-Ziv复杂度评价  

Vibration modeling of rolling bearings considering compound multi-defect and appraisal with Lempel-Ziv complexity

作　　者：朱永生[1] 袁幸[1] 张优云[1] 朱川峰[1] 周智[1] 

机构地区：[1]西安交通大学润滑理论及轴承研究所,西安710049

出　　处：《振动与冲击》2013年第16期23-29,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51035007);国家重点基础研究发展计划(973计划)资助项目(2011CB706606);国家科技重大专项资助项目(2010ZX04001-021);国家科技重大专项资助项目(2010ZX04014-015)

摘　　要：故障建模是探寻机械诊断中认知规律的关键环节。为了更能准确地预知振动特征,研究滚动轴承结合面间的多体接触与传递过程的耦合作用,根据Hertzian理论建立一种详细的计及内圈-外圈-轴承座传递过程的6DOF振动模型。从轴承实际运动学的角度刻画故障的形成及渐进发展过程,进而实现单点、复合故障的有效模拟,并与实验结果进行了比较。轴承运行过程中故障状态的变化,必然导致振动信号复杂性的变化。基于非线性动力系统理论,引入Lem-pel-Ziv复杂度指标评价运行状态。结果表明,单点及复合故障的信号具有不同的复杂度,反映了不同故障状态的动力学响应的差异。Lempel-Ziv复杂度能有效描述轴承振动信号的复杂性,可作为量化指标用于滚动轴承状态评价。The vibration modeling is a key link to explore the cognitive rules in fault diagnosis.In order to foresee the vibration characteristics accurately and efficiently,the transfer path and dynamic contact among joint interfaces were well studied.A novel methodology for dynamic modeling of 6DOF systems consisting of bearing inner race,outer race and housing was presented based on the theories of Hertzian contact.The progressive processes of single and compound multidefect were provided according to the practical kinematics of rolling bearings.The model describes the vibrations in time and frequency domains.Computed results from the model were according to the validated with experimental results,which were generated on defective deep groove ball bearings.The complexities of vibration signal change with the emergence and growth of faults.Based on nonlinear dynamics theory,the Lempel-Ziv complexity measure was used to characterize the complexity of single and compound multi-defect signals.The results show that the complexity measure used as a quantitative criterion can effectively appraise the running condition of rolling bearings.

关 键 词：滚动轴承 复合故障 振动建模 Lempel-Ziv复杂度 

分 类 号：TH17[机械工程—机械制造及自动化]