缸套旋转抛物面形微坑织构参数优化研究

在缸套表面制备旋转抛物面形微坑织构，在经典雷诺方程的基础上对微坑-缸套-活塞环系统进行研究，建立微坑动压分布函数。采用Matlab软件分析微坑深度、坑口半径对旋转抛物面形微坑润滑性能的影响。结果表明，随着微坑深度、坑口半径增大，平均油膜承载力呈现先增大后减小趋势，活塞环所受平均剪切应力呈现逐渐减小并趋于稳定，这是因为活塞相对缸套运动过程中，微坑区域内的楔形效应、空化效应导致了平均油膜承载力和平均剪切应力的波动。通过研究得到了旋转抛物面形微坑优化参数。

Parameters Optimization of Cylinder Rotating Parabolic Micro-pits

The rotating parabolic micro-pit were prepared in the cylinder surface. The rotating parabolic micro-pits-liner-piston ring system was studied based on the classic Reynolds equation and the micro-pits dynamic pressure distribution function was established. The impact of micro-pits depth and radius on the lubricating properties of the rotating parabolic micro-pit was analyzed by using Matlab software. The results show that, along with the increasing of micro-pit depth and pit radius, the average film bearing capacity is increased at first then decreased, the average shear stress is gradually decreased and tends to be a stable value. It is because the wedge effect, cavitation in the micro-pit area leads to the fluctuations of average oil film bearing capacity and average shear stress during the movement process of the piston relative to the cylinder liner. The optimization parameters of rotating parabolic micro-pits are achieved.