活塞动力学二阶运动的仿真方法与试验研究  

Simulation and Experimental Research on Piston Secondary Motion

作　　者：郭磊[1] 郝志勇[1] 张鹏伟[1] 刘波 

机构地区：[1]浙江大学机械与能源工程学院,杭州310027 [2]重庆长安汽车工程研究院,重庆400023

出　　处：《内燃机工程》2009年第6期41-47,共7页Chinese Internal Combustion Engine Engineering

基　　金：国家"十一五"科技支撑计划资助项目(070488)

摘　　要：采用多体动力学在时间域内迭代计算活塞、缸套及润滑油膜相互耦合子系统的运动学与动力学方程,在考虑活塞体径向刚度、活塞体及缸套冷热态型面的影响下,得到活塞主、副推力侧实际工况下的热态配缸间隙;动力学仿真方法计算出活塞二阶运动结果,包括:活塞主、副推力面间换向的径向运动和绕活塞销的转动;二阶运动对缸套的动态敲击力作为载荷边界条件施加在有限元模型上,计算出气缸体在活塞敲击下的振动响应;同时,在发动机台架上对气缸体两侧的活塞敲击处布置加速度传感器、以及布置缸内爆压传感器和上止点位置测量得到气缸体结构振动响应,试验结果验证了仿真模型的有效性。The kinetic and dynamics calculation of piston, cylinder liner and oil film subsystem was conducted by using multi-body dynamics method in the time domain. The piston radial stiffness distribution and the warm profile of piston and liner were the important input datas for determining the real clearance be- tween piston and liner. The characteristics of piston secondary motion consisted of the piston radial displace- ment and the swing angle around the piston pin. Based on the dynamical impingement force on the liner, the vibration response of cylinder block resulted from piston slap force was obtained by using finite element method. Finally, the cylinder pressure signal, top dead center signal and the vibration response of cylinder block under the maximal torque condition were measured on the engine test bed, and the simulated results were validated by the measurement both in time domain and frequency domain.

关 键 词：内燃机 活塞 二阶运动 活塞敲击力 振动加速度 

分 类 号：TK422.3[动力工程及工程热物理—动力机械及工程]