基于传声损失的汽车进气系统仿真分析与改进

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

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。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。

Based on acoustic finite element method, an acoustic simulation platform is set up for automobile air intake systems. By changing the length and cross-sectional area of＂ Helmholtz muffler pipe and other parameters, the intake system is improved. First, combined with the intake noise theory, a vehicle intake system is exemplified, for it has been proven that a specific frequency contributes significantly to the inside and outside noise of the vehicle by the method of noise identification. By changing corresponding parameters, the intake system is improved based on the guidance of the theoretical formula. Then, transmission loss of the improved intake system is calculated and analyzed. The results show that the theoretical fbrmula 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 in the intake system based on the sound transmission loss simulation.