High-sound-absorption-rate communicated multi-cavity resonance type sound-absorbing cover layer

Abstract

The invention discloses a high-sound-absorption-rate communicated multi-cavity resonance type sound-absorbing cover layer comprising a matching layer and an air-cavity-included elastic damping layer connected with the matching layer. A plurality of communicated multi-cavity units are formed in the air-cavity-included elastic damping layer; left / right arcs rotate around the central axes of the communicated multi-cavity units to form the communicated multi-cavity units, wherein the central axes of the communicated multi-cavity units are parallel with the thickness direction of the air-cavity-included elastic damping layer; and the left / right arcs are sinusoidal-like curves and all peak points of the left / right arcs change in a gradient manner. Therefore, the acoustic performance of the traditional cavity resonance type sound absorbing cover layer is improved substantially; with the communicated multi-cavity structure, the surface of the high-sound-absorption-rate communicated multi-cavity resonance type sound-absorbing cover layer matches the water impedance perfectly; and thus the acoustic wave energy entering the water-acoustic overlay interface can be absorbed to the greatest extent and the reflection is minimized.

Description

technical field [0001] The invention relates to a connected multi-cavity resonant sound-absorbing covering layer with high sound-absorbing rate, which is laid on the surface of an underwater submersible and belongs to the field of sound-absorbing and noise-reducing design. Background technique [0002] The sound absorption and noise reduction of underwater submersibles has been highly valued by various countries. At present, the acoustic coating technology is the only comprehensive technology that can not only reduce the target intensity of submersibles, but also suppress the radiation noise of submersibles. In the World War II studied, the German Navy installed a layer of synthetic rubber sound-proof material named "Alberich (Alberich)" on the shell of the submersible for the first time. This is the earliest resonance-type acoustic covering with a short cylindrical cavity. [0003] After half a century of development, the shape of the cavity of the resonant sound-absorbing ...

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Problems solved by technology

[0004] With the continuous development of underwater sonar technology, higher requirements are put forward for the stealth performance of underwater submersibles. The existing cavity structure cannot well meet the needs of high sound absorption rate in different frequency bands. Therefore, the design It is of great significance to propose a cavity structure with better sound absorption performance for the cavity resonance type acoustic covering with high sound absorption rate

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