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Square honeycomb composite underwater sound absorption structure with built-in air layer

A technology of honeycomb structure and air layer, which is applied in the direction of sound-generating devices, layered products, metal layered products, etc., to achieve the effect of improving sound wave loss ability, water pressure resistance ability and sound absorption performance

Pending Publication Date: 2021-11-05
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a square honeycomb composite underwater sound-absorbing structure with a built-in air layer in view of the above-mentioned deficiencies in the prior art. Solved the problem of poor broadband sound absorption performance of viscoelastic materials

Method used

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  • Square honeycomb composite underwater sound absorption structure with built-in air layer
  • Square honeycomb composite underwater sound absorption structure with built-in air layer
  • Square honeycomb composite underwater sound absorption structure with built-in air layer

Examples

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Effect test

Embodiment 1

[0054] Metal steel: It is characterized by a density of 7850kg / m3, a Young's modulus of 2.05GPa, and a Poisson's ratio of 0.28.

[0055] Viscoelastic material: characterized by a density of 1000kg / m 3 , the longitudinal wave velocity is 1000m / s, the longitudinal wave loss factor is 0.3, the shear wave velocity is 100m / s, and the shear wave loss factor is 0.9.

[0056] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.

[0057] Air: characterized by a density of 1.29kg / m 3 , the speed of sound is 340m / s.

[0058] Embodiment structure size:

[0059] Honeycomb cell size: a=20mm. Metal plate thickness: t=1mm. Air layer thickness: h 1 = 5 mm. Honeycomb rubber mixed layer thickness: h 2 = 40mm. Thickness of upper pure rubber covering layer: h 3 = 5 mm.

Embodiment

[0061] Examples of materials:

[0062] Metal steel: It is characterized by a density of 7850kg / m3, a Young's modulus of 2.05GPa, and a Poisson's ratio of 0.28.

[0063] Viscoelastic material: characterized by a density of 900kg / m 3 , the longitudinal wave velocity is 1200m / s, the longitudinal wave loss factor is 0.09, the shear wave velocity is 100m / s, and the shear wave loss factor is 0.9.

[0064] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.

[0065] Air: characterized by a density of 1.29kg / m 3 , the speed of sound is 340m / s.

[0066] Embodiment structure size:

[0067] Honeycomb cell size: a=25mm. Metal plate thickness: t=1mm. Air layer thickness: h 1 = 6mm. Honeycomb rubber mixed layer thickness: h 2 = 50mm. Thickness of upper pure rubber covering layer: h 3 = 4 mm.

Embodiment 3

[0069] Examples of materials:

[0070] Metal steel: It is characterized by a density of 7850kg / m3, a Young's modulus of 2.05GPa, and a Poisson's ratio of 0.28.

[0071] Viscoelastic material: characterized by a density of 800kg / m 3 , the longitudinal wave velocity is 800m / s, the longitudinal wave loss factor is 0.15, the shear wave velocity is 80m / s, and the shear wave loss factor is 0.8.

[0072] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.

[0073] Air: characterized by a density of 1.29kg / m 3 , the speed of sound is 340m / s.

[0074] Embodiment structure size:

[0075] Honeycomb cell size: a=20mm. Metal plate thickness: t=1mm. Air layer thickness: h 1 = 4 mm. Honeycomb rubber mixed layer thickness: h 2 = 35mm. Thickness of upper pure rubber covering layer: h 3 = 2mm.

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Abstract

The invention discloses a square honeycomb composite underwater sound absorption structure with a built-in air layer, which comprises a square honeycomb structure, the square honeycomb structure is arranged on a bottom plate, the upper surface of the square honeycomb structure is provided with a covering layer, each cell in the square honeycomb structure is filled with a viscous-elastic material, and an air layer is arranged between the viscoelastic material and the bottom plate. The sound absorption performance of the viscous-elastic material can be improved to a great extent, more adjustable parameters including structure parameters and material parameters are provided in the design aspect, corresponding adjustment can be conducted according to actual working condition requirements, the structure is simple, and manufacturing is easy.

Description

technical field [0001] The invention belongs to the technical field of underwater sound-absorbing composite structures, and in particular relates to a square honeycomb composite underwater sound-absorbing structure with a built-in air layer. Background technique [0002] At present, sound waves are the only effective medium for long-distance underwater information transmission, so they are widely used in underwater reconnaissance. As a typical anti-reconnaissance method, the anechoic layer reduces the intensity of reflected sound waves by absorbing part of the incident sound energy. Viscoelastic materials, such as rubber and polyurethane, are often used as the basis for sound-absorbing layers due to their acoustic impedance matching with water. Under the excitation of incident sound waves, the polymer chains inside the viscoelastic material start to vibrate, and the friction inside the molecules consumes part of the sound energy. However, the absorption of low-frequency so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/168B32B15/18B32B15/20B32B15/06B32B15/095B32B25/00B32B27/40B32B17/02B32B17/06B32B17/10B32B9/00B32B9/04B32B3/12
CPCG10K11/168B32B25/00B32B15/18B32B15/20B32B15/06B32B15/095B32B27/40B32B27/12B32B25/10B32B5/02B32B3/12B32B2262/101B32B2262/106B32B2307/102
Inventor 辛锋先卢天健于晨磊段明宇
Owner XI AN JIAOTONG UNIV
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