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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.

Inactive Publication Date: 2016-06-01
NAVAL UNIV OF ENG PLA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned anechoic tiles can have a good anechoic effect in a certain frequency range, but the anechoic frequency band is narrow, especially in the low frequency band, the sound absorption effect is poor.

Method used

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  • Multilayer material combined cavity anechoic tile
  • Multilayer material combined cavity anechoic tile
  • Multilayer material combined cavity anechoic tile

Examples

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Embodiment Construction

[0023] Below in conjunction with accompanying drawing and specific embodiment the invention is further introduced:

[0024] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown, a multi-layer material composite cavity sound-absorbing tile includes a surface layer 1, a perforated layer 2, and a base layer 3. Wherein, the surface layer 1 is in contact with the medium water, and the surface layer 1 adopts a sound-transmitting polyurethane elastomer. When the sound wave enters, because the acoustic impedance of the sound-transmitting polyurethane elastomer matches the acoustic impedance of the water, the enemy's active sonar sound waves can Maximize the incidence and reduce the reflection of sound waves. The perforated layer 2 is made of polyurethane double-layer composite foam sound-absorbing material, and the incident sound wave converts the sound wave energy into heat energy and dissipates it through the combined cavity and the waveform conversion and energy dissipa...

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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.

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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Application Information

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IPC IPC(8): B63G8/39G10K11/16G10K11/168
CPCB63G8/39G10K11/16G10K11/168
Inventor 楼京俊杨庆超刘国强李爽刘树勇
Owner NAVAL UNIV OF ENG PLA
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