弹性约束下变厚度蜂窝夹层板的隔声特性

Sound insulation characteristics of variable-thickness honeycomb sandwich plates based on elastic constraints

基于一阶剪切变形理论,研究了变厚度蜂窝夹层板在不同边界条件下的自由振动和隔声性能。从能量角度,利用改进的瑞利-里兹法和流固边界耦合条件,建立并求解了蜂窝夹层板的隔声理论模型。将理论计算的蜂窝夹层板固有频率、传声损失与相关文献结果和仿真结果对比,验证了所建立变厚度蜂窝夹层板隔声理论模型的准确性。此外,对比分析了特征角、厚度变化系数和边界条件对蜂窝夹层板隔声性能的影响。研究表明,厚度变化系数和边界条件对蜂窝夹层板隔声性能影响较大。

Based on the first-order shear deformation theory,the free vibration and sound insulation performance of honeycomb sandwich plates with variable thickness under different boundary conditions were researched.From the energy point of view,the theoretical model of sound insulation of honeycomb sandwich plates was established and solved by using the modified Rayleigh-Ritz method and the fluid-solid boundary coupling condition.The theoretical calculated inherent frequency and sound transmission loss of honeycomb sandwich plates were compared with the related literature results and simulation results,to verify the accuracy of the established theoretical model of sound insulation of honeycomb sandwich plates with variable thickness.In addition,the effects of thickness characteristic angles,thickness variation coefficients and boundary conditions on the sound insulation performance were analyzed.Studies have shown that the thickness variation coefficients and boundary conditions have a significant impact on the acoustic performance of honeycomb sandwich plates.