内燃机排气系统振动特性分析  

Vibration Characteristic Analysis of Engine Exhaust System

作　　者：王继先[1] 李兆文[2] 王务林[1] 郑泉[1] 陈黎卿[1] 

机构地区：[1]安徽农业大学工学院,合肥230036 [2]中国汽车技术研究中心

出　　处：《内燃机工程》2008年第3期72-75,共4页Chinese Internal Combustion Engine Engineering

基　　金：安徽省教育厅自然科学基金重点项目(KJ2007A061);安徽省科技厅2005年重点资助项目

摘　　要：针对某款480型柴油车配装的排气系统存在怠速状态下排气尾管振动强烈的现象,将模态试验分析技术和有限元模态分析相结合,建立了排气系统有限元模型,基于ANSYS软件和试验设备进行模态试验分析和谐响应分析,得出排气系统6阶固有频率和模态振型图。通过对仿真结果分析得知柴油机排气系统在2阶时发生了共振,采用优化悬挂位置点的方法对排气系统进行了改进设计。经实车验证,改进后取得了良好的效果,为进一步的降噪奠定了基础。In order to solve the problem of intense vibration of the exhaust tailpipe of a diesel engine, a FEA model was developed by using modality experiment analysis technology and finite element modality analysis. The six order natural frequency of the exhaust system and the modality vibration map were obtained through modality experiment analysis and harmonious response analysis. The simulated results show that the two order resonance occurs in this exhaust system. The exhaust system was redesigned by optimizing the suspention point position. The vehicle test result shows that the vibration of redesigned exhaust system is obviously reduced, which is beneficial to further decrease of engine noise.

关 键 词：内燃机 排气系统 模态分析 潴响应分析 振动 

分 类 号：TK423.4[动力工程及工程热物理—动力机械及工程]