中文摘要：

以某型发动机为研究对象,受生物界土壤动物蚯蚓和凹槽形减阻机构减阻运动的启发,将具有减阻耐磨性能的凹槽形态加工在发动机中的主要摩擦副气缸活塞裙部。根据标准活塞受力分布带情况,考虑到活塞受力的不均匀情况,设计了变槽深、宽和孔径的仿生结构,并将其加工在活塞裙部表面。运用正交试验方法制定了9种试验方案,理论研究算出每个试验中加载的边界载荷条件,进行有限元分析,得出可以考察活塞裙部减阻耐磨性能的三个目标变量：最大变形、最大应力、最大载荷。应用综合平衡分析法对试验指标进行优化设计,最终得出主次因素排序为：A孔槽分布类型、B凹槽深度、C凹槽宽度,最优水平为A3B1C3。

英文摘要：

It uses some type engine as the research object.lnspiredbysoil animal earthworms of the biological world and groove shape of friction reduction agency, it processes groovein thepiston skirt＇s face, which is the main friction pair of engine cylinder. Based on the standardpiston with the force distribution, considering non-uniform stress about piston, it designs changing depth ＆ width of grooves and apertures on piston skirt. It has made nine test planswith the orthogona! experiment method. The boundary conditions of load are theoretically calculated, whichproceeds finite-element analysis. Then itobtains three indexesthat aremaximum distortion, maximum stress and maximum load of piston skirt.Aggregating balance analysis is used in test indexes optimization design, drawing the primary and secondary factorsis A, B, C; the optimal level is A3B1C3.