Abstract
Based on the requirements of underwater acoustic stealth, the classification and research background of acoustic coatings are introduced herein. The research significance of acoustic coatings is expounded from the perspective of both the military and civilian use. A brief overview of the conventional design process of acoustic coatings is presented, which describes the substrates used in different countries. Aimed at the local design of acoustic coatings, research progress on passive and semi-active/active sound absorption structure is summarized. Focused on the passive acoustic coatings; acoustic cavity design and optimization, acoustic performance of acoustic coatings with rigid inclusions or scatterers, and acoustic coatings with a hybrid structure are discussed. Moreover, an overview of the overall design of acoustic coatings based on the sound field characteristics of the submarine is also presented. Finally, the shortcomings of the research are discussed, breakthroughs in acoustic coating design research are forecast, and the key technical issues to be solved are highlighted.
Highlights
As acoustic stealth equipment widely used in submarines, the acoustic coating can absorb the sound waves emitted by the active sonar
With the development of low-frequency sonar, high-efficiency sound absorption of underwater acoustic stealth materials with finite thickness under low frequency and wide frequency conditions has become a hot topic in current research [2]
With the development of numerical simulation software, the finite element method (FEM) can optimize the traditional structure and facilitate the research of new characterizing the acoustic performance of the Alberich-type acoustic coating; sound material structure
Summary
As acoustic stealth equipment widely used in submarines, the acoustic coating can absorb the sound waves emitted by the active sonar. It can suppress the vibration of the hull and isolate the noise inside the boat. With the development of low-frequency sonar, high-efficiency sound absorption of underwater acoustic stealth materials with finite thickness under low frequency (generally considered to be below 1 kHz) and wide frequency conditions has become a hot topic in current research [2]. The acoustic coating is one of the effective means to improve the sound stealth performance of submarine. Addition, acoustic acoustic coatings coatings play play an an important role in improving the marine environment and reducing noise pollution [7]. Shortcomings of the research were discussed, followed by the development of a new prospect
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