某乘用车汽车排气系统振动特性分析  

Analysis of Vibration Characteristics of Exhaust System of a Passenger Vehicle

作　　者：柳泽田 尹辉俊[1] LIU Ze-tian;YIN Hui-jun(College of Machinery and Communications,Guangxi University of Science and Technology,Guangxi Liuzhou 545006,China)

机构地区：[1]广西科技大学机械与交通学院,广西柳州545006

出　　处：《机械设计与制造》2022年第2期94-98,共5页Machinery Design & Manufacture

基　　金：广西高等学校优秀人才资助计划项目(桂教人[2011]40号);广西自然科学基金项目(2013GXNSFAA019319);广西科技计划项目(桂科攻1348005-12);广西重点实验室建设资助项目(桂财教[2013]51号13-A-01-06);广西研究生教育创新计划资助项目(YCSW2017202);广西科技大学硕士研究生创新项目(GKYC201902)。

摘　　要：排气系统作为一个复杂的多自由度振动系统,一端连接于发动机冷端,另一端通过挂钩悬挂于车身底盘,其悬挂位置和挂钩动刚度是汽车NVH性能的重要影响因素。在Hypermesh软件中建立排气系统有限元模型,在Nastran软件中计算自由模态并结合平均驱动自由度位移法(ADDOFD)以确定悬挂位置,在上述基础上对排气系统进行约束模态分析、预载荷分析并引入机械阻抗与加速度导纳理论进行频响分析。研究结果表明悬挂位置符合标准,有效的避开了发动机共振频段,挂钩动刚度较好的满足了隔振性能需求,系统振动响应在合理范围之内。Exhaust system is a complex multi-degree-of-freedom vibration system,one end is connected to the cold end of the engine and the other end is suspended to the chassis of the vehicle body through a hook,the suspension position and dynamic stiffness of the hook are important factors affecting the performance of the vehicle NVH. The finite element model of the exhaust system is established in Hypermesh software. The free mode is calculated in Nastran software and the suspension position is determined by ADDOFD,on the basis of the above,the constrained mode analysis,preload analysis and frequency response analysis of the exhaust system are carried out by introducing mechanical and acceleration admittance. The results show that the suspension position meets the standard,avoids the resonance frequency band of the engine effectively,and the dynamic stiffness of the hook satisfies the requirement of vibration isolation better,and the vibration response of the system is within a reasonable range.

关 键 词：排气系统 动刚度 平均驱动自由度位移法 模态分析 频响分析 

分 类 号：TH16[机械工程—机械制造及自动化] U463[机械工程—车辆工程]