热变形求解及其对高速点接触弹流润滑影响研究  

Solution of Thermal Deformation and Its Effects on High-Speed Point-Contact Elastohydrodynamic Lubrication

作　　者：孟凡明[1] 程志涛[1] 巩加玉 MENG Fanming;CHENG Zhitao;GONG Jiayu(The State Key Laboratory of Mechanical Transmission,Chongqing University,Chongqing 400044,China)

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：《摩擦学学报》2021年第5期680-689,共10页Tribology

基　　金：国家重点研发计划项目(2018YFB2000604)资助。

摘　　要：提出了一种固体表面热变形求解新方法(ITD),由此研究了热变形对高速点接触弹流润滑行为的影响.为此,基于计入流体惯性项的Reynolds方程获得了油膜压力,采用追赶法对润滑剂和接触固体的温度进行了求解,进而研究了不同工况下有无热变形的高速点接触非牛顿热弹流润滑性能.采用有限元法和离散累加法对ITD法进行了验证,通过中心膜厚试验验证了考虑热变形的正确性.结果表明:ITD法可准确快速地计算表面热变形;考虑热变形后,油膜厚度降低且向油膜出口倾斜,考虑热变形后的中心膜厚更接近试验结果.A new method(ITD method) to solve the thermal deformation of contacting surfaces was proposed,and its effect on the non-Newtonian thermal elastohydrodynamic lubrication(TEHL) model for the high-speed point contacts was studied.The film pressure was calculated using the Reynolds equation considering the fluid inertia force,and the temperatures of the lubricant and contacting solids were computed with the chase-after method.At the varied working conditions,effects of the thermal deformation on the TEHL performances were analyzed.To validate the model,the ITD method was verified with the finite element method and discrete summation method,and a central film thickness experiment was conducted to verify the rationality of the TEHL model considering the thermal deformation.It was revealed that the ITD method accurately and quickly evaluated the thermal deformation.With the thermal deformation considered,the film thickness reduced and inclined towards the outlet.Moreover,the central film thickness with the thermal deformation was close to the experimental result.

关 键 词：热变形 热弹流润滑 高速点接触 油膜厚度 ITD法 

分 类 号：TH133.33[机械工程—机械制造及自动化]