邢阳++杨浩++郑悦

摘 要：基于以声学有限元法为基础，建立了汽车进气系统声学仿真平台，通过改变赫姆霍兹消声器导管长度和管径截面积等参数，对进气系统进行结构改进。首先，结合进气噪声理论，以某款经过试验分析得出某特定频率对车内车外噪声贡献明显的进气系统为例，通过理论公式的指导改变相应的参数，对进气系统进行结构改进，再对改进后的系统进行传声损失计算与分析。研究结果表明，理论公式能有效指导进气系统的设计与结构改进，结合传声损失仿真的验证，能为进气系统噪声优化提供一种可靠实用的途径。

关键词：进气系统；传声损失；声学有限元；赫姆霍兹消声器

中图分类号：U461.99 文献标识码：A

Simulation Analysis and Improvement for a Vehicle Intake System Based 0n on Transmission Loss

Xing Yang1，2，Yang Hao1，2，Zheng Yue3

（1. China Automotive Engineering Research Institute Co. Ltd，Chongqing 401122，China；2. State Key Laboratory of Vehicle NVH and Safety Technology，Chongqing 401122，China；3. Chongqing University，College of Automotive Engineering，Chongqing University，Chongqing 400044，China）

Abstract：Based on acoustic finite element method，an acoustic simulation platform is set up for automobile air intake system. By changing the length of Helmholtz muffler pipe， the diameter cross-sectional area and the other parameters，the intake system is improved. First，combined with the intake noise theory ，a vehicle intake system is exemplified，which is already proved that a specific frequency contribute significantly to the pass-by and interior noise through the method of noise identification. By changing corresponding parameters，the intake system is improved， which is based on the guidance of the theoretical formula. Then， transmission loss of the improved intake system is calculated and analyzed. The results show that theoretical formula can not only effectively guide the design and structure improvement of the intake system， but also can provide a reliable and practical way for the optimization of noise of intake system， which is based on the sound transmission loss simulation.

Key words：intake system； transmission loss； acoustic finite element method； Helmholtz muffler

随着人们生活品质的不断提高，车辆NVH性能优劣已经成为消费者是否购买某车型的重要因素。经研究发现，汽车进气系统噪声是车辆最主要的噪声源之一，同时这个噪声源离车厢非常近，对车内噪声影响尤其明显[1-，2]。因此，汽车进气系统的NVH设计与优化是在车辆NVH性能开发过程中必不可少的重要设计指标[3]。

进气系统是车辆中一个非常重要的部件，对汽车进气系统的噪声产生机理以及噪声控制措施进行系统研究具有重要意义[4]。影响进气系统消声性能的因素比较多，包括扩张消声器（空气滤清器）和旁支消声器（赫姆霍兹消声器和1/4波长管）的匹配，各消声元件的容积，各管道的截面积与长度等[5-7]。本文将以某款经过试验分析得出某特定频率对车内车外噪声贡献明显的进气系统为例，建立进气系统声学有限元模型，进行传声损失分析，。……