Aerodynamic noise transmitted through greenhouse panels and sealing often dominates the higher frequencies of the interior noise level, whereas the underbody area contributes mainly to low and middle frequencies. A method that unsteady Computational Fluid Dynamics (CFD) for exterior airflow combined with Finite Element Method (FEM) for interior acoustic response was used. To validate the accuracy of this method, the interior wind noise of a simplified vehicle model proposed by Hyundai was computed. The comparison between the computational and experimental result showed that this method had enough accuracy to compute the interior wind noise induced by the exterior flow field. Then, the same method was used to compute the wind noise transmitted through the underbody of a passenger car. The characteristic of the noise source and noise inside the cabin was revealed, and the contribution of underbody flow-induced noise to the interior noise was also investigated. Finally, the influence of the underbody panels thicknesses on the interior wind noise was evaluated.

通过温室面板和密封件传播的空气动力噪声通常在内部噪声水平的较高频率中占主导地位，而车身底部区域主要是中低频频率。使用了一种用于外部气流的非稳态计算流体动力学（CFD）与用于内部声学响应的有限元方法（FEM）相结合的方法。为了验证该方法的准确性，计算了现代汽车提出的简化车辆模型的内部风噪声。计算结果与实验结果的比较表明，该方法具有足够的精度来计算由外部流场引起的内部风噪声。然后，使用相同的方法来计算通过乘用车底部传播的风噪声。揭示了机舱内噪声源和噪声的特征，并研究了车底流引起的噪声对内部噪声的影响。最后，评估了车身底板厚度对内部风噪声的影响。