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Model and absorption performance of anechoic coating embedding sphere cavities
Author(s): 
Pages: 909-916
Year: Issue:  7
Journal: Journal of Ship Mechanics

Keyword:  anechoic coatingsphere cavityhydrostatic pressureinternal air pressureabsorption property;
Abstract: Based on the 2D theory of sound wave normally impinging on the absorption layer, the acoustic-solid interaction model of anechoic coating which contains sphere cavities was made by COMSOL software and the model can calculate absorption coefficient directly instead of remodeling according to the volume of deformation under hydrostatic pressure. Perforation rate was compared between COMSOL and analytical solution in order to prove the validity of the model. The absorption property and influence of the internal air pressure were analysed based on the interaction model. The results indicate that with increasing of hy-drostatic pressure the peak frequency is towards to the high frequency and becomes wider, the more differ-ence is that effect of sound absorption becomes worse; internal air pressure makes the deformation of the cavity decrease and absorption coefficient in low frequency increase.
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