复合材料层合板的铺层几何对结构声传输的影响

INFLUENCE OF STACKING GEOMETRY ON SOUND TRANSMISSION THROUGH LAMINATED COMPOSITE PLATES

采用基于复合材料一阶剪切理论———Mindlin理论的板单元和基于Rayleigh表面积分方程的边界元 ,对嵌在无限障板上的复合材料层合板在低频简谐平面声波斜入射情况下 ,建立了考虑流体结构耦合的传声计算模型 ,并利用该模型计算研究了对称角铺设、反对称角铺设和正交铺设等不同铺设方式对层合板传声损失的影响以及在板侧流体介质分别为空气和水时层合板的传声特性 ,指出层合板的铺层几何对其传声损失有较大影响 ,应在设计中引起注意。

WT5BZ]On the basis of plate finite element based on Mindlin first order shear effect plate theory and boundary element based on Rayleigh integral on the plate surface,the computational model of sound transmission in the lowfrequency range through laminated composite plates excited by a harmonic oblique incident plane wave and mounted on an infinite baffle is presented.The model takes the fluid_structure coupling into account.The influence of different stacking sequences such as symmetric angle_ply,anti_symmetric angle_ply and cross_ply upon the sound transmission loss of the laminated composite plates is evaluated with the proposed model.The characteristics ot the sound transmission loss through the laminated composite plates in air and in water are discussed.The results indicate that the laminate stacking geometry may have a significant influence on the transmission loss valuel for laminated composite plates and the designer must be careful when deciding on the laminate stacking geometry. [WT5HZ]