发动机空间6DOF动力隔振拓扑模型仿真研究

Simulation research on 6DOF topology model of engine mounting system

汽车发动机悬置是典型的6DOF动力隔振系统,传统的动力隔振模型将动力机械整体视为刚体,而本文考虑运动零部件的影响,为汽车发动机悬置的结构设计带来了一种全新的视角。通过对发动机上运动零部件进行受力分析,找到引起发动机振动的最主要内在激励源;建立6DOF动力隔振空间拓扑模型,利用Simscape/Multibody仿真研究,验证了传统的动力隔振模型与空间拓扑模型之间存在理论误差;动力隔振拓扑模型更能准确描述6DOF动力隔振系统特性,所建立的汽车6DOF发动机Simscape/Multibody仿真模型可为后续的主动悬置设计提供重要基础。

A vehicle engine mount is a typical six degrees of freedom(6DOF) mechanical vibration isolation system.In a traditional mechanical vibration isolation model,the whole machinery is regarded as a rigid body.However,considering the influence of moving parts in this paper,it will bring a new perspective for the structural design of an automotive engine mount.Through a force analysis of moving parts on the engine,the most important intrinsic excitation source is found that causes engine vibration.The 6-DOF spatial topology model was constructed.It is verified that there is the theoretical error between the traditional mechanical vibration isolation model and the topology model,using simulation research based on Simscape/Multibody.The topology model can describe the characteristics of the 6DOF mechanical vibration isolation system more accurately,and the established 6DOF Simscape/Multibody model can be used in active mount design.