单向加筋双层板隔声性能的有限元分析

Finite Element Analysis of Sound Transmission through Unidirectionally Reinforced Sandwich Plates

为考察筋板声学透明假设理论对于加筋双层板隔声计算的适用性,对典型波纹芯体加筋双层板在简谐平面声波正入射和斜入射激励下的声透射损失(STL)进行有限元分析。分别建立筋板声学透明声腔和结构-声学全耦合加筋双层板的有限元模型,计算得到结构具有不同芯体构型和腔内声学介质时的STL曲线。结果表明,筋板"声学透明"假设模型带给加筋双层板STL计算误差取决于筋板结构阻抗和筋板间腔内介质声阻抗相对大小。因此,加筋双层板结构STL的准确预测需考虑筋板与腔内介质间与的结构-声学耦合作用。

The sound transmission loss（STL） of unidirectionally reinforced sandwich plates with typical corrugated cores is analyzed by means of finite element method.Two 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 ABAQUS.The STL curves for the plates with different core structures and acoustic media in the cavities are calculated.The results indicate that the error of STL computation of the reinforced sandwich plate induced by the＂acoustically transparent＂assumption for the reinforced panels depends on the ratio of the structural resistance of the core elements to the acoustic resistance of the fluid inside the enclosed cavities.Therefore,more accurate prediction of the vibro- acoustic responses and STL of the plates can be achieved by considering the structuralacoustic couplings between the core elements and the fluid in the cavities in the modeling.