工程塑料加筋双层板的隔声性能分析

Research on the Engineering Plastics Reinforced the Sound Insulation Performance of Double-Layer Panels

为探究工程塑料加筋板与声学介质的不同耦合方式对隔声量的影响,在Virtual Lab中建立四种耦合方式的塑料加筋双层板模型,计算得到不同工程塑料和流体声学介质的隔声频率特性曲线。结果表明工程塑料中增加双层板面板及筋板层厚度,可以使阻尼控制区向低频移动;筋板与声学介质的不同耦合方式,在结构特性阻抗与流体介质的声学特性阻抗比较接近时,耦合方式的不同会对工程塑料双层板隔声量引起较大差异。充分考虑流体域介质和板层介质的特性阻抗匹配关系,在工程预测加筋双层板隔声量时能起到一定的参考作用。

The sound transmission loss（TL）of reinforced sandwich plates with typical corrugated cores is analyzed by means of finite element method. Four different FE models,of which one is with acoustically-transparent core elements and the other considers the structural-acoustic coupling between the core elements and the fluid inside the enclosed cavities are respectively created by LMS Virtual Lab. The results showed that the four kinds of stiffened plate model in calculating the sound insulation quantity difference when the double plate depends on impedance stiffened plate structure and the cavity acoustic medium impedance match. Therefore,engineering plastics reinforced double plate structure of TL accurately predict institutions of the stiffened plate and cavity acoustic medium-acoustic coupling effect.