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

A technology of sound-absorbing covering layer and sound absorption rate, which is applied in the direction of sound-emitting devices, active noise control, instruments, etc., to achieve good application prospects, wide application prospects, and the effect of improving acoustic performance

Active Publication Date: 2019-01-04
DALIAN UNIV OF TECH
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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 absorp

Method used

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

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Embodiment Construction

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0029] Such as Figure 1-Figure 4 As shown, a high sound absorption rate connected multi-cavity resonant sound-absorbing covering layer includes: a matching layer 1 and an elastic damping layer 2 containing an air cavity connected thereto;

[0030] The air-cavity elastic damping layer 2 is provided with a plurality of connected multi-cavitie...

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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 ...

Claims

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Application Information

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IPC IPC(8): G10K11/162G10K11/178
CPCG10K11/162G10K11/17861G10K2210/127
Inventor 陈文炯任春晶刘书田
Owner DALIAN UNIV OF TECH
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