具有中央凸起的点接触弹流润滑特性研究  

Lubricating Properties on Central Bump under Elastohydrodynamic Lubrication Point Contacts

作　　者：吴海宝[1] 王学锋[1] 胡如夫[1] WU Haibao;WANG Xuefeng;HU Rufu(College of Mechanical and Automotive Engineering,Ningbo University of Technology,Ningbo Zhejiang 315336,China)

机构地区：[1]宁波工程学院机械与汽车工程学院,浙江宁波315336

出　　处：《润滑与密封》2023年第6期150-155,共6页Lubrication Engineering

基　　金：浙江省自然科学基金项目(LY17E050007)。

摘　　要：建立具有中央凸起的点接触弹流润滑控制方程,并采用多重网格法及多重网格积分法进行数值求解;比较有凸起表面和光滑表面下的压力及膜厚曲线,讨论载荷及卷吸速度对压力分布及油膜形状的影响。结果表明:具有中央凸起时在接触中心附近,压力经历了急剧升高、骤然下降、再升高的一个波动过程;最小膜厚出现在接触中心,且接触中心前面产生了一个凹陷;增大卷吸速度或减小载荷都使得膜厚曲线整体升高,最小膜厚随着卷吸速度的增大而增大,载荷几乎不影响最小膜厚;载荷增大使得最大压力增大,但中心局部压力波动范围变化很小;增大卷吸速度使得最大压力和中心局部压力波动范围都减小。Governing equations of central bump under elastohydrodynamic lubrication point contacts were established and then numerically solved by using multi-level method as well as multilevel multi-integration method.The pressure and film thickness were compared between the smooth surface and bumped surface.The effects of the applied load and entrainment velocity on the pressure distribution and film shape were discussed.The gained conclusions are listed as follows.In the vicinity of the contact center on central bump,the pressure experiences a fluctuation composed of a rapid increase and then a sudden decrease and finally a rising.The minimum film thickness appears at the contact center and there exists a dimple before the contact center.The film curve as a whole increases with the increase of the entrainment velocity or the decrease of the applied load.The minimum film thickness increases with the increase of the entrainment velocity whereas it hardly depends on the applied load.As the applied load increases,the maximum pressure increases whereas the local pressure fluctuation of the contact center is tiny.The maximum pressure as well as the local pressure fluctuation of the contact center decreases with the increase of the entrainment velocity.

关 键 词：点接触 凸起 弹流润滑 压力波动 

分 类 号：TH117.2[机械工程—机械设计及理论]