Mixed lubrication analysis consideration with large deformation

在许多机械部件(径向轴承、活塞泵等)中，边缘滑动接触有较大变形。针对这一问题，提出了考虑大变形的分析方法。讨论了无表面粗糙度的精确接触有限元分析和表面粗糙度下的微观接触分析、油膜压力及其组合。首先对接触点附近较小网格的有限元接触进行处理，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)简单的油膜分析(即。Ertl-GRubin理论)适用于活塞边缘这样的非简单形状。该方法适用于形状复杂或位移较大的单元处的弹流润滑薄膜。实验检测、电容计测量位移、红外测温仪测量接触面积等都是试验性的，没有适用的结果。

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.