静压下多层材料椭球形空腔吸声覆盖层的吸声性能分析

基于声波垂直入射下的二维解析公式,利用COMSOL软件建立椭球形空腔吸声覆盖层模型并与静压下穿孔率的理论公式进行对比,验证模型的有效性;利用所建模型分析了静压下多层材料椭球形空腔的吸声性能.结果表明:在静水压力条件下,多层材料吸声覆盖层的低频吸声性能比常压的要好,中高频方面两者相差不大;穿孔率25%下的吸声覆盖层在低频和高频的表现比穿孔率33.3%和穿孔率50%的吸声覆盖层要好,静压下穿孔率越大并不代表改善吸声覆盖层低频吸声性能越好;静压下多层材料吸声覆盖层随着压力的增大,椭球形空腔的形变量和覆盖层厚度的压缩量越大.

Absorption performance of the multi-layered material anechoic coating embedding spheroidicity cavities

Based on the theory of sound wave normally impinging on the absorption layer of 2D,the mode of the multi-layered material anechoic coating embedding spheroidicity cavities is built by COMSOL.Perforation rate was compared between COMSOL and analytical solution in order to prove the validity of the model.The results indicate that the absorption performance of low-frequency of the multi-layered material anechoic coating under hydrostatic pressure is better than that of constant pressure.The absorption performance between absorption performance and constant pressure is almost same.The ab-sorption performance of perforation rate(25%) of anechoic coating in low-frequency and high-frequency is better than those of perforation rate(33%) and perforation rate(50%).With the increasing of perforation rate,The absorption performance of low-frequency of the multi-layered material anechoic coating is not getting better.Therefore,with the pressure increasing of the multi-layered material anechoic coating in low-frequency under hydrostatic pressure,the volume of deformation and thickness of coating are getting bigger.