高速轿车外场气动噪声仿真分析

摘要

基于Lighthill声类比理论,采用声学有限元/无限元方法对某款轿车外部声场进行了仿真分析.结果表明,车身周围噪声源主要存在于后视镜及轮胎等区域及其后部;偶极子声源为主要成分并集中于中低频段,四极子声源则集中于高频段;远场监测点声压级最高为82 dB.%Aerodynamic noise is the main source of noise for high-speed vehicles. In this paper,the simulation of exterior aerodynamic noise around a sedan model was conducted,using a hybrid acoustic finite-infinite element method based on Lighthill analogy. The results show that the sedan aerodynamic noise is mainly concentrated inside mirror areas and tire areas. The dipole sources are the dominant noise source, spreading across the low-middle frequencies regions,while the quadrupole sources concentrate on high frequency band.The maximum SPL at monitoring points is 82 dB.