吸声覆盖层脱落状态的声学性能分析

Acoustic Performance Analysis of Anechoic Coatings in Debonding States

摘要:

针对声学覆盖层脱落问题，首先以均匀分层介质理论建立覆盖层脱落模型，在垂直入射和斜入射条下，将解析解与数值计算结果进行相互验证，并计算脱落介质和脱落层厚度以及入射角度对复合结构反射和透射性能的影响。计算结果表明：脱落层介质对结构的透声性能影响较大，脱落层为空气时频响曲线变化显著，透射系数趋于 0。就反射系数而言，不同入射角度下，脱落后反射系数有所增大；水层较空气层而言对入射角度的变化敏感。

Abstract:

To solve the debonding problem of anechoic coating，a model has been built according to the homogeneous stratified medium theory. Under the condition of normal incidence and oblique incidence，mutual authentication has been made between analytical solution and numerical result. Then the effect of debonding media， thickness of debonding layer and incidence angle on the reflection and transmission performance of the composed structure have been calculated. The result shows that the debonding stratified medium has significant influence on the acoustic transmission performance of the composed structure. When it is air debonding layer，the frequency response curve changes significantly，and the transmission coefficient tends to zero. For the reflection coefficient，it increases after debonding under different incidence angles. The water layer is more sensitive to the variation of incidence angle than the air layer.