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Acoustic stealth covering layer and application thereof

A sound-absorbing covering layer and covering layer technology are applied in the field of sound stealth, which can solve the problems that the low-frequency sound-absorbing performance is difficult to be improved, and the low-frequency sound-absorbing effect is difficult to achieve, and achieve good broadband sound-absorbing performance and low-frequency sound-absorbing performance. Good, small size effect

Pending Publication Date: 2020-04-14
CHINA SHIP DEV & DESIGN CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, porous materials are limited by the sound absorption mechanism, and it is difficult to achieve low-frequency sound absorption; while the other two types of acoustic structures are difficult to improve low-frequency sound absorption performance under the condition of limited size.

Method used

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  • Acoustic stealth covering layer and application thereof
  • Acoustic stealth covering layer and application thereof
  • Acoustic stealth covering layer and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] An acoustic stealth coating covering the surface of an underwater vehicle, the schematic diagram of the section is as follows figure 2 As shown, the thickness of the steel plate is 10mm, and the acoustic stealth covering layer is composed of nitrile rubber with a thickness of 50mm and a combined sound-absorbing structure embedded in the outer surface of the nitrile rubber. A spherical cavity with a diameter of 24.6mm (the center of the ball is 12.3mm away from the rubber surface), and a steel spherical shell with an outer diameter of 24.6mm and a thickness of 0.3mm is built in the cavity. On the side, a hole with a diameter of 3mm is opened without chamfering. The hole can lead the water in the environment to the inside of the steel spherical shell, and a nitrile with an inner diameter of 12.0mm and a thickness of 0.3mm is arranged in the steel spherical shell. Rubber ball, the air in the rubber ball is atmospheric pressure, the outer steel spherical shell and the inne...

Embodiment 2

[0039]An acoustic stealth covering layer adopting a single-size combined sound-absorbing structure, covering the surface of an underwater vehicle, the thickness of the outer steel plate of the aircraft is 10mm, and the acoustic stealth covering layer is made of nitrile rubber with a thickness of 50mm and embedded in nitrile rubber The outer surface is composed of a combined sound-absorbing structure. The outer surface of nitrile rubber is in contact with water. A spherical cavity with a diameter of 11.6mm is dug on the surface of the rubber (the center of the ball is 5.8mm from the rubber surface), and an outer cavity is built into the 11.6mm cavity. For a steel spherical shell with a diameter of 11.6mm and a thickness of 0.4mm, a hole with a diameter of 3mm is opened on the side of the steel spherical shell facing the outer surface of the nitrile rubber, and the chamfer of the hole is 10 degrees. The water is led to the inside of the steel spherical shell, and there is a nitri...

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Abstract

The invention relates to an acoustic stealth covering layer and application thereof, the acoustic stealth covering layer covers the surface of an acoustic protection body, and the acoustic stealth covering layer is composed of a sound absorption covering layer and one or more combined sound absorption structures embedded in the sound absorption covering layer; each combined sound absorption structure is composed of a double-layer spherical shell, a round hole is formed in the surface of the outer-layer spherical shell, the hole right faces the outer surface of the sound absorption covering layer and is communicated with media outside the sound absorption covering layer, the inner-layer spherical shell is placed in the outer-layer spherical shell, and the inner-layer spherical shell is filled with air. The acoustic stealth covering layer provided by the invention is simple in structure, the size of the combined sound absorption structures in the acoustic stealth covering layer is small,the whole acoustic stealth covering layer is easy to realize, the acoustic stealth covering layer has good broadband sound absorption performance, particularly good low-frequency sound absorption performance, and the sound absorption frequency band of the acoustic stealth covering layer can be designed by changing the size parameters of the inner spherical shell and the outer spherical shell of the combined sound absorption structures.

Description

technical field [0001] The invention belongs to the technical field of acoustic stealth, and relates to an acoustic stealth covering layer with good broadband sound absorption performance, especially low-frequency sound absorption performance, and an application thereof. Background technique [0002] Modern underwater vehicles generally lay sound-absorbing coatings on the surface to absorb the detection sound waves of active sonar, thereby reducing the intensity of their own acoustic targets and reducing the chance of being discovered. [0003] The current sound-absorbing coating generally has good sound-absorbing performance in the middle and high frequency bands, but the sound-absorbing performance is poor in the low-frequency band (less than 3000Hz). The main reason is that the sound-absorbing coating that meets the engineering application conditions has a thickness It is usually limited, and the base material with limited thickness is difficult to directly absorb the low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/168B32B1/00B32B15/18B32B15/06B32B25/14B32B3/26B32B7/02
CPCG10K11/168B32B1/00B32B15/18B32B15/06B32B25/14B32B3/266B32B7/02B32B2307/102
Inventor 苗天丞邓轶彭茜蕤汪浩龚强
Owner CHINA SHIP DEV & DESIGN CENT
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