某SUV后视镜镜臂气动噪声试验

Experimental on aerodynamic noise of side-mirror arm of a SUV

汽车在高速行驶(速度超过100 km/h)时,气动噪声对车内噪声环境影响起主导作用.因此,对车外噪声源的控制显得尤为重要.采用试验的方法,研究了后视镜的镜臂不同长度参数对车内噪声环境影响的变化规律,推导出后视镜镜臂参数与车内声能量、语言清晰度呈对数变化规律,且响度呈现出非线性变化规律,得到了后视镜镜臂长度参数控制在40~50 mm,声压级减小0.6 dB(A)约0.5%,语言清晰度提高5.4%,AI相对贡献9%~14%,响度降低0.5~0.6宋,相对贡献1.7%~2.1%.初步获得后视镜镜臂长度参数的控制技术,改善了车内的噪声环境,提高了车内的声品质.

When a car runs at a high speed more than 100 km/h,the aerodynamic noise produced by the interaction of air flow and car body plays a leading role in the noise contribution of the vehicle,so it is very important to control the aerodynamic noise source outside the vehicle.The correlation between aerodynamic of the SUV rear mirror arm length and the interior noise environment of the vehicle was studied by the experimental method.The results show that the relationship between the parameters of the rear mirror arm length and sound energy is logarithmic.The relationship between the parameters of the rear mirror arm length and articulation is logarithmic,too.The relationship between the parameters of the rear mirror arm length and loudness follows quadratic equation.When the rear mirror arm length is controlled to be between 40~50 mm,the sound pressure level is reduced by 0.6 dB(A),the relative improvement is about 0.5%,the articulation is increased by 5.4%AI,the relative change is 9%~14%,the loudness is reduced by 0.5~0.6 sone,and the relative improvement is about 1.7%~2.1%.The technical method of the controlling aerodynamic noise in the rear mirror arm length has been obtained preliminarily.The technology reduces the noise in the car and improves the sound quality of the SUV.