车内噪声预测与面板声学贡献度分析

面板声学贡献度分析是汽车NVH特性研究的重要内容，识别各面板对车内场点的贡献度对于控制车内噪声有着重要意义。利用有限元结合边界元的方法，建立三维车辆乘坐室声固耦合模型，使用ANSYS软件计算出乘坐室在20-200Hz频率的声固耦合振动特性后，采用LMS Virtual．lab软件预测了驾驶员左、右耳的声压响应。并通过各壁板对驾驶员右耳声压的面板贡献度分析，得出了各壁板对驾驶员右耳总声压的贡献度，为降低车内某点噪声进行结构修改提供理论依据。通过对结构修改，有效降低了车内某点噪声。

Vehicle Noise Prediction and Panel Acoustic Contribution Analysis

Panel acoustic contribution analysis(PACA) is an advanced engineering tool to improve the NVH quality of vehicle.A three-dimensional sound-structural coupling model of a vehicle is presented in this paper by using the finite element method(FEM) and the boundary element method(BEM) to predict the interior acoustic field.Structural vibration responses of the vehicle are computed in a frequency range from 20 to 200Hz,and interior noise response of vehicle passenger compartment is calculated by using direct BEM with LMS Virtual.lab software.The panel acoustic contribution analysis(PACA) is done to determine the vehicle body panels of the vehicle passenger compartment contributing most to the noise levels at the drive's right ear.Structure-borne noise is reduced in the interior of the compartment by updating the structure model.