发动机活塞拍击动力学分析及活塞表面磨损预测

针对活塞在缸内的拍击直接导致了活塞和气缸套摩擦磨损的问题，提出在多体动力学分析软件AVL-EXCITE中建立包括活塞、气缸套、活塞环组、活塞销以及连杆的模型，输入发动机相关结构参数和工况条件，进行了活塞拍击动力学仿真，利用模拟结果数据预测活塞表面磨损趋势和分析了活塞型线的变化.结果表明:活塞拍击运动参数随活塞和气缸套之间的间隙变大而增大，本来有中凸型线的活塞变成倾斜圆筒活塞.模拟结果跟实际观察结果相对比，二者有比较好的一致性.

Dynamics Analysis of Engine Piston Slapping and Forecast of the Piston Surface Wear

According to the problems about the friction wear of the piston and cylinder which results from the piston slapping of engine, the model with the piston, cylinder, piston pin, piston rings and connecting rod was built in the multi-body dynamics software AVL-EXCITE. The piston slapping dynamics simulation was carried out when the engine oriented parameters and working conditions were input. According to the simulation result data, predicting the piston surface wear trend and analysis of the piston profile change were carried out. It was found that the piston slapping parameters also increase with the increment of the gap between piston and cylinder, and convex piston becomes skewed cylinder piston. The simulation results and the actual observation results are consistent through the contrast.