某轿车排气系统振动特性仿真及优化  

Simulation and optimization for vehicle exhaust system of vibration performance

作　　者：徐献阳[1] 李松波[1] 张建武[1] 

机构地区：[1]上海交通大学机械与动力工程学院汽车工程研究院,上海200000

出　　处：《机械》2008年第3期13-14,26,共3页Machinery

摘　　要：基于一维的BEAM单元对排气系统进行了有限元建模,并将有限元模态分析结果和实验模态分析结果进行对比,结果显示,一维的排气系统数值模型可以准确描述真实系统的动力学特性。在此基础上,运用优化设计方法对排气系统的吊挂点位置进行了精细化优化设计,以达到通过调节排气系统固有频率而提高车辆NVH性能的目的。An FEA model of the vehicle exhaust system is established by using the one-dimensional BEAM elements. Through comparison of the FEA results with the real experiments, it is revealed that the present one-dimensional model can be applied to describe the real dynamic characteristic of the exhaust system accurately.Accordingly, the method of optimization design may be used to modify positions of the hangers of the exhaust system for the purpose of matching the system natural frequencies, and improving the performance of the vehicle NVH.

关 键 词：排气系统 有限元建模 模态分析 优化设计 

分 类 号：TB535.1[理学—物理]