汽车排气系统低频噪声分析与结构优化  

Low Frequency Noise Analysis and Structure Optimization of Automotive Exhaust Systems

作　　者：耿鹏飞[1,2] 张延超[1,2] 耿旭贞 范永恒[1,2] GENG Peng-fei;ZHANG Yan-chao;GENG Xu-zhen;FAN Yong-heng(R&D Center Great, Wall Motor Company, Baoding 071000, Hebei China;Automotive Engineering Technical Center of Hebei Province, Baoding 071000, Hebei China)

机构地区：[1]长城汽车股份有限公司技术中心,河北保定071000 [2]河北省汽车工程技术研究中心,河北保定071000

出　　处：《噪声与振动控制》2016年第5期82-85,共4页Noise and Vibration Control

摘　　要：针对某车型排气尾管低频噪声大问题,利用GT-Power软件建立发动机工作过程与排气消声器耦合仿真分析模型,对排气消声器声学性能和空气动力学性能进行数值计算,分析排气尾管低频噪声大的原因。依据分析结果提出消声器结构优化方案,制作优化样件进行整车排气尾管噪声试验。试验结果表明,低转速时消声器插入损失提高5d B^7 d B(A),2阶次噪声整体降低,低频噪声问题明显改善。Model for engine working process and exhaust muffler coupling simulation of a car is established with GTPOWERsoftware and the acoustic characteristics and aerodynamics performance of the exhaust muffler are computed. Thereason of large low- frequency noise of the exhaust tailpipe is found. Muffler structure optimization strategy is proposedbased on the simulation results. Then, the full vehicle exhaust tailpipe noise test is conducted to validate the proposal. Testresults show that, at low rotary speed, the muffler insertion loss is increased by 5 dB (A)-7 dB (A) after the optimization, theoverall second order noise is reduced, and the low frequency noise is reduced significantly.

关 键 词：声学 排气消声器 低频噪声 声学性能 空气动力学性能 结构优化 

分 类 号：TB535.2[理学—物理] U464[理学—声学]