考虑车身弹性发动机悬置系统的模态分析  

Modal analysis of vehicle frame elastic engine mount system

作　　者：魏剑[1] 郑飞杰[1] 林智宏 WEI Jian;ZHENG Feijie;LIN Zhihong(School of Mechanical and Electrical Engineering,Sanming University,Sanming 365004,China)

机构地区：[1]三明学院机电工程学院,福建三明365004

出　　处：《渤海大学学报（自然科学版）》2023年第4期376-384,共9页Journal of Bohai University:Natural Science Edition

基　　金：福建省区域发展项目(No:2022H4009);三明市产学研协同创新重点科技项目(No:2022-G-16)。

摘　　要：多自由度发动机悬置系统存在耦合问题,直接影响悬置系统的隔振.首先,分别建立6自由度,考虑弹性基础9自由度和12自由度的发动机悬置系统动力学模型;然后,分析车身弹性对悬置系统固有频率和相应的阵型的影响.研究表明:(1)考虑车身影响的悬置系统直接影响系统的固有特性和解耦率;(2)车身弹性在z方向刚度对系统的垂向固有频率最为敏感;(3)右悬置z方向,左悬置y方向和后悬置y方向刚度对系统侧倾固有频率影响最大;(4)右悬置y方向和左悬置较低y方向刚度值对耦合系统俯仰固有频率敏感.The multi-degree-of-freedom engine mounts have coupling problems that directly affect the vibration isolation of the mounts.Firstly,the dynamics of the engine mounts system with 6 degrees of freedom and considering the elastic base 9 and 12 degrees of freedom are modeled respectively;And then,the effect of body elasticity on the inherent frequency of the mounts and the corresponding formations is analyzed.The study shows that①the mounts system considering the influence of the vehicle frame directly affects the inherent characteristics and decoupling rate of the system;②Vehicle elasticity in the z-direction is most sensitive to the vertical intrinsic frequency of the system;③the right mounts Z-direction,the left mounts Y-direction and the rear mounts Y-direction stiffness have the greatest influence on the system's intrinsic frequency of lateral sway;④The lower Y-directional stiffness values of the right mount and left mounts are sensitive to the pitching intrinsic frequency of the coupled system.

关 键 词：悬置系统 固有频率 阵型 耦合 

分 类 号：U463.33[机械工程—车辆工程]