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Viscous-elastic material transverse partition plate partition underwater sound absorption structure

A transverse baffle, viscoelastic technology, applied in the direction of sound-producing equipment, instruments, etc., to achieve good underwater sound absorption performance, improve water pressure resistance, and simple structure.

Pending Publication Date: 2020-12-08
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 an underwater sound-absorbing structure with viscoelastic material transverse partition partitions to solve the problem of the traditional underwater sound-absorbing structure being not resistant to water pressure and broadband through reasonable design of the structure. The problem of poor sound absorption performance

Method used

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  • Viscous-elastic material transverse partition plate partition underwater sound absorption structure
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  • Viscous-elastic material transverse partition plate partition underwater sound absorption structure

Examples

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Effect test

Embodiment

[0048] Examples of materials:

[0049] Metal steel: characterized by a density of 7850kg / m 3 , Young's modulus 205GPa, Poisson's ratio 0.28.

[0050] Viscoelastic material: It is characterized by a density of 900kg / m3, a longitudinal wave velocity of 900m / s, a longitudinal wave loss factor of 0.09, a shear wave velocity of 100m / s, and a shear wave loss factor of 0.9.

[0051] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.

[0052] The structural dimensions of embodiment and comparative example:

[0053] see figure 2 , (a) is a uniform viscoelastic material with equal thickness, (b) is a viscoelastic material with fixed cell walls, (c) is a viscoelastic material with a transverse partition, and the length of the transverse partition is the same, (d ) is provided with three transverse partitions of different lengths, and the distance between the three partitions is equal from top to bottom. In order to ensure the objectivity of the compar...

Embodiment 2

[0055] Examples of materials:

[0056] Metal steel: characterized by a density of 7850kg / m 3 , Young's modulus 205GPa, Poisson's ratio 0.28.

[0057] Viscoelastic material: characterized by a density of 900kg / m 3 , The longitudinal wave velocity is 1200m / s, the longitudinal wave loss factor is 0.2, the shear wave velocity is 120m / s, and the shear wave loss factor is 0.9.

[0058] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.

[0059] The structural dimensions of embodiment and comparative example:

[0060] see figure 2 , (a) is a comparative example of a viscoelastic material with uniform thickness, (b) is a viscoelastic material with a fixed cell wall, (c) is a viscoelastic material with a transverse partition, and the length of the transverse partition is the same, (d) Three horizontal partitions of different lengths are installed, and the distance between the three partitions is equal from top to bottom and longer and longer. In or...

Embodiment 3

[0062] Examples of materials:

[0063] Metal steel: characterized by a density of 7850kg / m 3 , Young's modulus 205GPa, Poisson's ratio 0.28.

[0064] Viscoelastic material: characterized by a density of 800kg / m 3 , the longitudinal wave velocity is 800m / s, the longitudinal wave loss factor is 0.2, the shear wave velocity is 100m / s, and the shear wave loss factor is 0.9.

[0065] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.

[0066] The structural dimensions of embodiment and comparative example:

[0067] see figure 2 , (a) is a comparative example of a viscoelastic material with uniform thickness, (b) is a viscoelastic material with a fixed cell wall, (c) is a viscoelastic material with a transverse partition, and the length of the transverse partition is the same, (d) Three horizontal partitions of different lengths are installed, and the distance between the three partitions is equal from top to bottom and longer and longer. In ord...

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Abstract

The invention discloses a viscous-elastic material transverse partition plate partition underwater sound absorption structure. A plurality of wall plates are vertically arranged on a bottom plate at intervals, a plurality of transverse partition plates are horizontally arranged on one side of each wall plate, a cell is formed between every two adjacent wall plates, and a viscous-elastic material is arranged in each cell. According to the structure, more adjustable parameters including structural parameters and material parameters are provided in the design aspect, corresponding adjustment canbe conducted according to the 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 an underwater sound-absorbing structure partitioned by viscoelastic material transverse partitions. Background technique [0002] Compared with the sound-absorbing structure in the air environment, underwater sound absorption has always been a more difficult problem due to the higher sound velocity in water and the lower water viscosity. Viscoelastic materials are often used for underwater sound absorption. Viscoelastic materials such as rubber or polyurethane are composed of polymer materials. Under the excitation of sound waves, the molecular chains rub against each other to generate energy loss. Due to the strong penetrating ability of low-frequency sound waves, thicker thicknesses or resonant structures are required to absorb low-frequency sound waves. For example, Alberich-type sound-absorbing coverings introduce cavities i...

Claims

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Application Information

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IPC IPC(8): G10K11/16G10K11/162G10K11/172
CPCG10K11/162G10K11/161G10K11/172
Inventor 辛锋先卢天健于晨磊段明宇
Owner XI AN JIAOTONG UNIV
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