Multilayer material combined cavity anechoic tile

A technology of multi-layer materials and sound-absorbing tiles is applied in the field of vibration reduction and noise reduction, which can solve the problems of poor sound absorption effect and narrow sound reduction frequency band, and achieve the effects of improving low-frequency sound absorption performance, reducing cost, and reducing complexity.
CN105620697AInactive Publication Date: 2016-06-01NAVAL UNIV OF ENG PLA
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NAVAL UNIV OF ENG PLA
Publication Date
2016-06-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a multilayer material combined cavity anechoic tile which consists of a surface layer, a punching layer and a base layer, wherein mixed type cavity structures consisting of circular-table-shaped cavities and horn-shaped cavities are arranged in the punching layer in an arrayed manner; a punching rate of the circular-table-shaped cavities is 10-20%; a punching rate of the horn-shaped cavities is 1-2%; each mixed type cavity structure consists of one circular-table-shaped cavities and two to six horn-shaped cavities; the surface layer is made of sound transmission polyurethane elastomer; the punching layer is made of polyurethane double-layer compound foam sound absorption material; the base layer is made of butyl rubber matched with the impedance of a housing of an underwater navigation vehicle; and the surface layer, the punching layer and the base layer are glued through an adhesive sequentially, and are subjected to integrated cold-press moulding.
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Description

technical field

[0001] The invention relates to a noise reduction device, in particular to a noise reduction tile with a composite cavity structure of multi-layer materials, which belongs to the field of vibration reduction and noise reduction. Background technique

[0002] Underwater vehicles will produce mechanical noise, propeller noise and hydrodynamic noise when moving underwater. If the noise is too loud, it will be easily detected by enemy sonar, thus affecting its concealment and safety. In order to reduce the detection range of the enemy's sonar and increase the range of its own sonar, laying anechoic tiles on the shell of the underwater vehicle is a very effective measure. Anechoic tiles with good performance can not only absorb most of the enemy's active Sonar detects sound waves and can suppress the outward propagation of its own noise.

[0003] At present, the acoustic tiles of underwater vehicles are mostly made of a single or multi-layer rubber material with ...

Claims

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