Sound absorption characteristics of underwater flexible micro-perforated sound absorption structures

作     者：HOU Jiuxiao ZHU Haichao LIAO Jinlong YUAN Suwei HOU Jiuxiao;ZHU Haichao;LIAO Jinlong;YUAN Suwei

作者机构：National Key Laborutory on Ship Vibration&NoiseInstitute of Noise&VibrationNaval University of EngineeringWuhan 430033 

出 版 物：《Chinese Journal of Acoustics》 (声学学报（英文版）)

年 卷 期：2020年第39卷第4期

页      面：512-525页

核心收录：

学科分类：082403[工学-水声工程] 08[工学] 0824[工学-船舶与海洋工程] 

基　　金：supported by the National Natural Science Foundation of China(51675529) 

主　　题：absorption sound underwater 

摘      要：A mathematical model for the micro-perforated panel in water medium is established using mode superposition method,and an equivalent circuit model is acquired based on electro-acoustic analogy *** of the flexible micro-perforated panel(FMPP) and the flexible back panel(FBP) on normal incidence sound absorption coefficient are *** micro-perforated panel in air medium,the underwater micro-perforated panel cannot achieve any satisfactory sound absorption effect due to insufficient structural *** this end,a strengthened micro-perforated sound absorption structure is *** results are verified in a water-filled impedance *** the range from 20 Hz to 2,000 Hz the average absorption coefficient of the strengthened flexible micro-perforated panel are improved *** absorption coefficient curve gradually approaches rigid micro-perforated panel as the bending stiffness *** flexible back panel can reduce the resonance frequency of the absorption curve and improve the low-frequency sound absorption performance.