基于混合润滑的结合面法向接触刚度建模  

Modeling on normal contact stiffness of interfaces based on mixed lubrication

作　　者：王世军[1] 刘鑫 吴敬伟 卫娟娟 李鹏阳[1] WANG Shijun;LIU Xin;WU Jingwei;WEI Juanjuan;LI Pengyang(Faculty of Mechanical and Precision Instrument Engineering,Xi’an University of Technology,Xi’an 710048,China;Technology Department Xi’an Kunlun Industry(Group)Co.,Ltd.,Xi’an 710043,China)

机构地区：[1]西安理工大学机械与精密仪器工程学院,陕西西安710048 [2]西安昆仑工业(集团)有限责任公司技术部,陕西西安710043

出　　处：《西安理工大学学报》2023年第1期47-59,共13页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(52075439);西安市碑林区科技计划资助项目(GX2236)。

摘　　要：为了研究含油结合面的接触刚度特性,本文采用分形接触理论、连续变形理论和刚度分配模型,建立了微凸体及油膜的接触刚度模型并将其耦合。通过这个模型,分析了材料特性、摩擦因数及润滑介质对法向接触刚度的影响。结果表明接触载荷较小时,油膜刚度占总刚度比重较大。接触载荷较大时,油膜刚度占总刚度比重较小。对比模态试验与有限元结果,考虑摩擦的含油模态试验及有限元分析的固有频率均明显大于无油无摩擦情况。在考虑摩擦和油膜影响后,有限元分析获得的固有频率与试验获得的固有频率最大相对误差为3.85%,表明本文模型能很好地预测结合部的接触特性。The contact stiffness model between asperities and oil film is established and coupled by adopting the fractal contact theory,constant deformation theory and stiffness distribution model to study the contact stiffness characteristic of oil-containing interface.By the model,the effects of material property,friction factor and lubrication medium on the normal contact stiffness are analyzed.The results indicate that the stiffness of oil film accounts for larger proportion in the total contact stiffness when the contact load is small,and that it accounts for smaller proportion when the contact load is high.The comparison between the results from modal experiment and finite element analysis indicates that the contact stiffness and modal frequency from modal experiment and finite element analysis with oil film and friction are significantly greater than the results without oil and friction.After considering the influence of friction and oil film,the maximum relative error between modal frequencies from finite element analysis and experiment is 3.85%,revealing that this model can better predict the contact characteristics of joint.

关 键 词：分形接触 摩擦 油膜刚度 法向接触刚度 

分 类 号：TH113[机械工程—机械设计及理论]