基于三维有限元法的排气系统声模态分析

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英文篇名：A research on acoustic mode of automotive exhaust system based on 3D finite element method 作者：范永恒 ; 耿鹏飞 ; 罗恩志 ; 张慧芳 ; 吕士海 ; 白炜 英文作者：FAN Yongheng;GENG Pengfei;LUO Enzhi;ZHANG Huifang;LYU Shihai;BAI Wei;R&D Center of Great Wall Motor Company;Automotive Engineering Technical Center of Hebei Province; 关键词：声模态 ; 尾口声压级 ; 排气系统 ; 三维有限元 英文关键词：acoustic mode;;tailpipe sound pressure level;;exhaust system;;3D finite element method 中文刊名：SDGC 英文刊名：Journal of Shandong University of Technology(Natural Science Edition) 机构：长城汽车股份有限公司技术中心;河北省汽车工程技术研究中心; 出版日期：2019-04-22 11:27 出版单位：山东理工大学学报(自然科学版) 年：2019 期：v.33;No.167 语种：中文; 页：SDGC201904015 页数：5 CN：04 ISSN：37-1412/N 分类号：73-77

摘要

为分析排气系统声模态和尾口噪声的关系,采用三维有限元法对声模态和尾口声压级进行仿真计算。通过仿真分析结果和平面波理论求解结果的对比,发现了影响排气系统声模态的关键部件,改变关键部件以实现对声模态的调节;仿真分析结果表明,尾口声压级峰值频率与声模态频率相对应,调整声模态能够调节尾口声压级。应用实例中某车型由于排气系统声模态而引起尾口低频噪声大,将声模态频率从31.2 Hz移动到26.8 Hz,问题得到有效改善。
        In order to analyze the relationship of exhaust system acoustic mode and tailpipe noise, acoustic mode and tailpipe sound pressure level were calculated by using 3 D finite element method. By comparing the results of acoustic mode simulation and plane wave theory calculation, the key component that influences the acoustic mode can be found and modified to adjust the acoustic mode. Peak frequency of the tailpipe SPL simulation matches the acoustic mode frequency and modification of the acoustic mode can realize the adjustment of the tailpipe sound pressure level. Due to the acoustic mode issue of exhaust system, the tailpipe low frequency noise of a certain vehicle is very large. When the acoustic mode frequency decreased from 31.2 Hz to 26.8 Hz,the problem is effectively mitigated.

引文

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