中文摘要：

应用发动机专用仿真软件AVL_EXCITE进行了发动机活塞-活塞环一气缸套副的动力学分析，获得了活塞在气缸内的拍击运动参数和活塞与气缸套碰撞力。提出了一种发动机活塞表面的磨损趋势的预估方法，并进行了仿真分析研究。根据仿真计算结果模拟了发动机运转过程中活塞与气缸套接触状态，得到了作用在活塞表面每一点上的接触力，根据其接触力模拟了发动机活塞磨损状态。模拟结果表明能够准确地预测到在不同活塞与气缸套间隙下的活塞拍击运动特性及表面磨损情况。

英文摘要：

The dynamic analysis of engine＇s piston-cylinder-ring assembly is carried out by the special simulation software for engine-AVL_EXCITE, and the piston slap parameter in cylinder and the piston＇s impact force against cylinder are obtained. The prediction estimation method for the wear of engine piston profile is proposed and then prediction simulation is conducted. On the basis of the simulation results, the contact state of the piston with cylin- der liner is calculated, and the contact force acting on the surface of piston is obtained. Consequently, the wear state of piston is simulated according to the contact force. The results of simulation show that the piston＇s slap mo- tion parameters and the wear state can be accurately predicted in different gap.