基于结构-声耦合法的汽车镁质仪表板声贡献度分析及结构改进

利用结构-声耦合法对仪表板进行声传递损失分析，与隔声实验对比验证了该方法的可靠性和方便性。与钢制仪表板进行隔声性能对比，证明镁质仪表板具有很好的隔声性能。建立仪表板声辐射模型，利用镁质仪表板对入射声场的响应，计算得到仪表板在驾驶室侧的辐射声场，找出辐射声压和声功率峰值频率。通过对声功率和透射声场声压最大处的声贡献度分析，确定了对隔声低谷影响最大的区域。针对该区域进行结构更改从而改变模态值，对其进行计算隔声量。结果表明，改进后的仪表板隔声低谷比改进前提升5dB，仪表板整体隔声性能提高。

Sound Contribution Analysis and Structural Modification for the Magnesium Dash with the Structure-sound Interaction Method

Sound transmission loss of dash has been analyzed with structure-sound interaction method. Comparing with the sound transmission experiment, the method is verified to be reliable and feasible. In contrast with steel dash on sound transmission performance, the magnesium one has well sound transmission performance. By dividing the dash into several panels and with the response of dash from incident sound field, the dash sound radiation model is made to calculate the radiating sound field from dash at the side of driving room to find frequencies that have peak radiating sound pressure and sound power. With sound contribution analysis of point with highest sound pressure and acoustic power, the region that has the biggest influence on sound transmission loss valley also. Structural modification of this area was made to change the mode and sound transmission is calculated with that done. The result shows that the sound transmission loss has been raised by 5 dB after the modification, and the whole sound transmission performance of the dash has been enhanced.