基于高阶剪切变形理论的层合板透声性能分析

Transmission characteristic of laminated composite plate based on high order shear deformation theory

为有效控制复合材料结构在船舶应用中的声学影响,更好地给舱内人员和设备提供较理想的工作环境,首先利用高阶剪切形变理论,建立了复合材料层合板Rayleigh-Ritz模型,并推导了结构透声损失的封闭解;然后,重点探讨了复合材料层合板的铺层角度、主方向弹性模量比、密度和阻尼等材料参数对不同流体介质中结构的透声性能影响。研究发现:铺层角度不改变结构整体的透声水平;密度是影响结构透声损失的最显著参量,材料阻尼的增大则使得结构透声损失曲线下降峰幅值稍有增加,而材料主方向弹性模量比对空气中的层合板透声性能影响较水中突出。

In order to effectively control the acoustic impact of composite structures in ship applications and better provide a more ideal working environment for cabin personnel and equipment,the Rayleigh-Ritz model of composite laminates was established by using the theory of high order shear deformation,and the closed solution of the structural transmission loss was derived.The influence of the material parameters such as ply-angle,elastic modulus ratio in main direction,density and dam-ping on the sound transmission characteristic of the composite plate in different fluid media was emphatically discussed.The results show that:the changes of ply-angle have no effects on the overall sound transmission level of the structure;the density is the most significant parameter that affects the sound transmission loss of the structure;the increase of material damping slightly increases the drops of sound transmission loss,and the change of elastic modulus ratioi in main direction of the material has a more prominent effect on sound transmission loss in air than in water.