Mixed lubrication analysis consideration with large deformation

在许多机械元件（轴颈轴承、活塞泵等）中，大变形边缘处存在滑动接触。本文提出了考虑总变形的分析方法。讨论了无表面粗糙度的精密接触有限元分析、有表面粗糙度油膜压力的细观接触分析及其组合，并采用了柱塞泵/马达中活塞-缸体接触条件下的分析模型。首先，我们在接触点附近用较小的网格处理有限元接触，讨论接触压力或变形的合适网格尺寸。然后计算考虑变形的油膜压力。油膜厚度的计算公式适用于简单形状接触（圆形或圆柱形）的简单油膜分析（即油膜厚度）。Ertl-Grubin理论）适用于活塞边缘等非简单形状。该方法适用于形状复杂或位移较大的单元处的弹流润滑膜。目前还在进行实验检测，用电容仪测量位移，用红外测温仪测量接触面积，尚无可应用的结果。

Sliding contact at edge with large defomation in many mechanical elements (journal bearings, piston pumps , etc). Analysis method considering gross deformation for this problem is developed in this project. Precise contact FEM analysis without surface roughness, microscopic contact analysis at surface roughness oil film pressure and their comnination are Discussed.The analysis model under the conditions of piston-cylinder contact in piston pump/motor is used. First, we handle FEM contact with smaller mesh near contact point, to discuss the appropriate mesh size for contact pressure or deformation., then calculate oil film pressure considering deformation.. The fomulation of oil film thickness are for simple shape contact (circle or cylindrical) simple oil film analysis (ie. Ertl-Grubin theory) are for non-simple shape like the edge of piston. It is adapted method for EHL film at the element, which has complex shape or large displacement. Experimental examinations, measurement of displacement by capacity meter and contact area by IR thermalscope are testing now, so there is no applicable results.