水下多孔吸声材料夹层板隔声分析

利用结构弯曲波法，并结合Biot理论和Bolton多层板理论，推导了水下多孔吸声材料夹层板的隔声量理论计算公式，分析了（Binding-Binding，BB）型、（Binding-Unbinding，BU）型和（Unbinding-Unbinding，UU）型三种结构的隔声性能。将入射域、辐射域和中间空腔域中的声波以相应的速度势函数形式表达，多孔吸声材料的传声过程采用Biot理论和Bolton理论描述，再结合相应模型的边界条件，即可求解出结构的理论隔声量。在BB型、BU型和UU型三种模型中，UU型的隔声性能最好，BB型的隔声性能最差。夹层板中多孔吸声材料能有效避免空腔驻波共振的发生，并能显著提高结构高频的隔声性能。多孔吸声材料厚度和空腔空气层厚度的增加，能有效地促进结构的隔声性能。

Sound insulation analysis of underwater sandwich plate with poroelastic material

By combining Biot theory and Bolton multilayer-panel theory, the calculation formulas of the sound transmission loss (STL) of underwater sandwich plate with poroelastic material are derived, and the sound insulation performances of three constructions (BB, BU and UU) are analyzed. By expressing the acoustic waves in incident field, radiation field and intermediate cavity field with corresponding velocity potential functions, using Biot theory and Bolton theory to describe the transmission process of acoustic waves in poroelastic material, and combining the boundary conditions of the three constructions, the STL of the three models (BB, BU and UU) can be obtained. Among the three models, the UU model has the best sound insulation performance, and the BB model is the worst. The poroelastic material can effectively avoid the standing-wave resonance in cavity, and can significantly improve the sound insulation performance of sandwich plate in high frequency range. Both the thickness of poroelastic material and the thickness of air layer in cavity can effectively promote the sound insulation performance of sandwich structure.