基于模态分析的某越野车动力总成壳体结构优化  

Structural optimizing of powertrain housing of off-road vehicle based on modal analysis

作　　者：王良模[1] 王文源[1] 张一京 陈荣华[2] 袁刘凯[2] 张汤赟[2] 

机构地区：[1]南京理工大学机械工程学院,江苏南京210094 [2]南京依维柯汽车有限公司,江苏南京210028

出　　处：《南京理工大学学报》2015年第3期358-362,共5页Journal of Nanjing University of Science and Technology

基　　金：江苏省产学研前瞻性联合研究项目(BY2009109);南京市产学研合作项目(201306011)

摘　　要：针对某越野车在行驶路况复杂、载荷多变等情况下,动力总成壳体出现开裂的现象,运用有限元模态分析和模态试验相结合的方法,研究了动力总成的振动模态。一阶、二阶模态固有频率较低,容易形成共振,使壳体的应变能密度较高、分动器壳体连接处的振幅较大,导致壳体开裂。采用在壳体高应变能密度区域增加加强筋的方法提高刚度,通过增加连接点和在周边布置加强筋减小振幅。仿真结果表明:该方法提高了动力总成的固有频率,降低了应变能密度,避开了发动机常用转速下的共振频率,有效防止了壳体开裂。Aiming at the rupture of powertrain housing for an off-road vehicle because of the complex road conditions,changing loads and so on,the vibration mode of the powertrain is researched using the finite element modal analysis and modal experiments. The first order modal natural frequency and second order modal natural frequency of the powertrain are low and easy to form a resonance,the strain energy density of the housing is high and the amplitude at the connection of the transfer case housing is large,which cause the rupture of the powertrain housing. Ribs are added in the high strain energy density area of the transmission housing to improve the stiffness,connecting points are in-creased and ribs are added in the surrounding to reduce the amplitude. Simulation results show that the natural frequency of the optimized powertrain is improved,the strain energy density is reduced,the resonance frequency under the common engine speed is avoided,so that the rupture of the powertrain housing is prevented.

关 键 词：动力总成 壳体 模态分析 共振 应变能密度 加强筋 刚度 

分 类 号：U461.91[机械工程—车辆工程]