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

被引：2
|
作者：
HOU Jiuxiao [1 ]
ZHU Haichao [1 ]
LIAO Jinlong [1 ]
YUAN Suwei [1 ]
机构：
[1] National Key Laboratory on Ship Vibration & Noise,Institute of Noise & Vibration,Naval University of Engineering
来源：
Chinese Journal of Acoustics | 2020年 / 39卷 / 04期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.15949/j.cnki.0217-9776.2020.04.006
中图分类号：
TB56 [水声工程];
学科分类号：
082403 ;
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 method.Effects of the flexible micro-perforated panel(FMPP) and the flexible back panel(FBP) on normal incidence sound absorption coefficient are analyzed.Unlike micro-perforated panel in air medium,the underwater micro-perforated panel cannot achieve any satisfactory sound absorption effect due to insufficient structural impedance.To this end,a strengthened micro-perforated sound absorption structure is proposed.Theoretical results are verified in a water-filled impedance tube.Within the range from 20 Hz to 2,000 Hz the average absorption coefficient of the strengthened flexible micro-perforated panel are improved obviously.The absorption coefficient curve gradually approaches rigid micro-perforated panel as the bending stiffness increases.The flexible back panel can reduce the resonance frequency of the absorption curve and improve the low-frequency sound absorption performance.
引用
收藏
页码：512 / 525
页数：14
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