Underwater sound absorption structure with zigzag partition plates filled with viscous-elastic materials

A technology of viscoelasticity and baffles, which is applied in the direction of sound-generating devices and instruments to achieve the effects of easy manufacture, simple structure and improved sound absorption performance

Pending Publication Date: 2021-01-01
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a viscoelastic underwater sound-absorbing structure filled with zigzag partitions in view of the above-mentioned deficiencies in the prior art. The problem of poor broadband sound absorption performance

Method used

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  • Underwater sound absorption structure with zigzag partition plates filled with viscous-elastic materials
  • Underwater sound absorption structure with zigzag partition plates filled with viscous-elastic materials
  • Underwater sound absorption structure with zigzag partition plates filled with viscous-elastic materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0041] Examples of materials:

[0042] Metal steel: it is treated as rigid in the simulation calculation.

[0043] Viscoelastic material 1: characterized by a density of 800kg / m 3 , the longitudinal wave velocity is 800m / s, the longitudinal wave loss factor is 0.09, the shear wave velocity is 80m / s, and the shear wave loss factor is 0.9.

[0044] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.

[0045] The structural dimensions of embodiment and comparative example:

[0046] The control example is a uniform rubber material of equal thickness, see figure 1 In (b), in order to ensure the objectivity of the comparison, the thickness h of the embodiment and the comparative example remains consistent as h=40mm, and the width of the cell is a=25mm; the thickness t=1mm of the zigzag partition, the thickness of the zigzag partition The parameters are d = 10mm for the longitudinal height of the bend, and c for the transverse length. In the discussi...

Embodiment 2

[0048] Examples of materials:

[0049] Metal steel: it is treated as rigid in the simulation calculation.

[0050] Viscoelastic material 1: characterized by a density of 900kg / m 3 , the longitudinal wave velocity is 1000m / 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.

[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] The comparative example is a uniform rubber material of equal thickness. In order to ensure the objectivity of the comparison, the thickness h of the embodiment and the comparative example remains consistent as h=40mm, and the width of the cell is a=20mm; the thickness t=1mm of the zigzag partition, The parameters of the zigzag partition are d = 10mm in the longitudinal height of the bend, and c in the transverse direction. In the discussion, c = 2mm and c = 5mm are re...

Embodiment 3

[0055] Examples of materials:

[0056] Metal steel: it is treated as rigid in the simulation calculation.

[0057] Viscoelastic material 1: 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 150m / s, and the shear wave loss factor is 0.8.

[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] The comparative example is a uniform rubber material of equal thickness. In order to ensure the objectivity of the comparison, the thickness h of the embodiment and the comparative example remains consistent as h=50mm, and the width of the cell is a=3mm; the thickness t=1mm of the zigzag partition, The parameters of the zigzag partition are d = 10mm in the longitudinal height of the bend, and c in the transverse direction. In the discussion, c = 2mm and c = 5mm are res...

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Abstract

The invention discloses an underwater sound absorption structure with zigzag partition plates filled with viscous-elastic materials. The structure comprises a bottom plate, a plurality of zigzag partition plates are vertically arranged on the bottom plate at intervals, every two adjacent zigzag partition plates and the bottom plate form a cell, and each cell is internally provided with a viscoelastic material. The sound absorption performance of the viscous-elastic material can be improved to a great extent, more adjustable parameters including structural parameters and material parameters areachieved 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 an underwater sound-absorbing structure filled with viscoelastic materials with zigzag 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 in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162
CPCG10K11/162
Inventor 辛锋先刘懋霖于晨磊段明宇
Owner XI AN JIAOTONG UNIV
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