To study the oil film performance, a multi-physical coupling model considering the elastohydrodynamic lubrication effect of the piston–cylinder interface is established and verified. The oil film thickness is obtained by solving geometric formulae, and the dynamic pressure model is derived by solving the Reynolds equation. Considering the oil film thickness and pressure distribution of the piston–cylinder interface, the elastic deformation model is solved. Both theoretical and experimental results show that the oil film morphology is influenced by the elastic deformation of the piston surface. The impact of the minimum fluid film thickness and its influence on the piston surface are well analyzed and discussed. When taking elastic deformation into account, the viscous friction reduces greatly, especially during the oil discharging process. Based on the theoretical research, a unique test rig was designed and established for testing and measuring the oil film thickness and the viscous friction of the piston.

中文翻译：

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考虑活塞-气缸界面的弹性流体动力润滑作用的油膜特性

为了研究油膜性能，建立并验证了考虑活塞-气缸界面弹性流体动力润滑作用的多物理耦合模型。通过求解几何公式获得油膜厚度，并通过求解雷诺方程得出动态压力模型。考虑到油膜厚度和活塞-气缸界面的压力分布，求解了弹性变形模型。理论和实验结果均表明，油膜的形貌受活塞表面弹性变形的影响。很好地分析和讨论了最小流体膜厚度的影响及其对活塞表面的影响。考虑到弹性变形时，粘滞摩擦会大大降低，尤其是在排油过程中。