用边界元法计算高速车辆内部气流噪声

Calculations about Interior Aerodynamic Noise for High-Speed Automobile by BEM

车内噪声严重影响了车辆乘坐的舒适性 ,同时由于气流噪声随车速的六次方增长 ,故随着高速公路的不断新建以及车速的不断提高 ,研究和降低气流噪声已成为控制高速车辆车内噪声的关键之一 笔者在风洞实验的基础上 ,首先分析了气流噪声向车内传播的基本途径 ;然后利用边界元理论 (BEM ) ,建立了车内声场的边界积分方程 ,并利用三角形线性元对该边界积分方程进行了离散 ;最后通过MATLAB编程求解 ,对由车外脉动压力诱发产生的车内气流噪声的大小进行了理论计算 ,与风洞实验结果相比 。

Aerodynamic noise of high speed automobile is a new problem emerged with the development of modern technology. In this paper, on the basis of the wind tunnel experiments and theoretical analysis, the transmitting path of external aerodynamic noise towards the cab is discussed. Using boundary element method (BEM), the interior aerodynamic noise induced by exterior fluctuating pressure of high speed automobile is calculated. From the result of wind tunnel experiments, it is found that the measured and calculated results are in good agreement for both the total sound pressure levels and the sound pressure levels in any frequency band.