摘要
为有效降低汽车后视镜处气动噪声,设计了3款外后视镜基座造型,联合流体软件和声学软件对汽车外流场和驾驶舱内声场进行耦合计算。通过分析整车外流场速度云图、前侧窗玻璃表面声压分布以及驾驶舱内声压级分布和声压级频谱曲线变化规律得到:方案Ⅱ的外后视镜基座因增加了"L"型凸起物,改变了流经前侧窗气流的流向和流速,减弱了高速气流对前侧窗地冲击,同时降低了驾驶舱内的噪声。数值结果与风洞试验数据相吻合,验证了计算方法的正确性,为降低汽车外后视镜的气动噪声提供了理论指导,有利于提高司乘人员的舒适性,增加产品的竞争力。
In order to effectively reduce the vehicle aerodynamic noise, the joint fluid software and acoustics software are used to calculate the flow field and acoustic field of the three exterior mirrors of a vehicle, the external flow field and the sound field in the cockpit were obtained. By analyzing the velocity profile of the external flow field, the sound pressure distribution on the front window glass, the sound field distribution and the spectral curve of the sound pressure level in the cockpit, the results show. The outer mirror base of scheme II has the ＂ L＂ -shaped protrusion, which changes the flow and velocity of the flow through the front side window, reduces the impact of the high-speed airflow on the front side window and the noise in the cockpit. The numerical resuhs agree well with the wind tunnel test data, and the validity of the numerical method is verified, which provides guidance for reducing the aerodynamic noise of the exterior mirror base of the automobile, which is beneficial to improving the comfort of the occupants and enhancing the competitiveness of the products.
出处
《机械设计与研究》
CSCD
北大核心
2017年第6期142-145,共4页
Machine Design And Research
基金
武汉市教育科学"十三五"规划2016年度课题(2016C258)
关键词
外后视镜基座
流场
前侧窗
气动噪声
声压级频谱图
风洞试验
exterior mirror base
flow field
front side window
aerodynamic noise
sound pressure levelspectrum
wind tunnel test
