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Damping material filled open-cell foam metal type underwater sound absorption composite structure

A technology of open-cell foam and damping materials, which is applied in the direction of metal layered products, sound-generating devices, and synthetic resin layered products. It can solve the problems of loss of elasticity, loss of vibration and noise absorption, and improve sound absorption performance and water pressure resistance. performance, improved sound absorption performance, and the effect of good underwater sound absorption performance

Active Publication Date: 2020-09-22
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These materials can play a certain role in sound absorption and noise reduction when used underwater, but at the same time there are some defects: as the water depth continues to increase, the increase in pressure will make it lose its elasticity, and then lose the function of absorbing vibration and noise

Method used

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  • Damping material filled open-cell foam metal type underwater sound absorption composite structure
  • Damping material filled open-cell foam metal type underwater sound absorption composite structure
  • Damping material filled open-cell foam metal type underwater sound absorption composite structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0040] Examples of materials:

[0041] Metal aluminum: density 2700kg / m 3 , Young's modulus 70GPa, Poisson's ratio 0.33.

[0042] Soft polyurethane: density 980kg / m 3 , Young's modulus 6MPa, Poisson's ratio 0.493, loss factor 0.5.

[0043] Hard polyurethane: density 1100kg / m 3 , Young's modulus 30MPa, Poisson's ratio 0.490, loss factor 0.3.

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

[0045] The structure size of embodiment:

[0046] The simulation calculation uses the tetrahedron model of open-cell aluminum foam, the cell side length is 8mm, the diameter of the aluminum foam skeleton is 2mm, the porosity is 70.1%, and the thickness of the aluminum foam is 50mm; the hard polyurethane covering layer is the same up and down, and the thickness is 2mm.

[0047] Using the above materials and structural dimensions to carry out numerical simulations, the results of the examples are given as follows:

[0048] The sound absorption pe...

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Abstract

The invention discloses a damping material filled open-cell foam metal type underwater sound absorption composite structure which comprises an open-cell foam metal framework used for bearing; the upper surface and the lower surface of the open-cell foam metal framework are respectively provided with a hard damping material covering layer, the open-cell foam metal framework and the hard damping material covering layers form a sealing structure, and the open-cell foam metal framework is filled with soft damping materials used for absorbing sound. The underwater sound absorption composite structure has excellent mechanical properties and good underwater sound-absorbing performance, has more adjustable parameters including structural parameters and material parameters in the design aspect, canbe correspondingly adjusted according to actual working condition requirements, and is simple in structure and easy to manufacture.

Description

technical field [0001] The invention belongs to the technical field of underwater sound-absorbing composite structures, in particular to an underwater sound-absorbing composite structure filled with open-cell foam metal with damping material. Background technique [0002] As the only form of energy that can travel long distances in the ocean, sound waves are the only information carrier to complete tasks such as underwater communication, positioning, and search. Therefore, in the complex marine environment, underwater sound-absorbing materials have very important applications in both military and civilian applications. Most of the traditional underwater sound-absorbing materials use polymer damping materials, such as rubber and polyurethane. Its sound absorption mechanism is mainly based on the intramolecular friction caused by the sound wave inside the material and the energy consumption mechanism of the sound wave on the interface of different media. These materials can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172G10K11/168B32B33/00B32B27/40B32B27/06B32B25/04B32B15/20B32B15/095B32B15/06B32B15/04B32B7/12B32B3/26B32B3/12
CPCG10K11/172G10K11/168B32B3/12B32B15/20B32B15/043B32B15/06B32B15/095B32B7/12B32B27/06B32B27/40B32B25/04B32B3/266B32B33/00
Inventor 辛锋先卢天健于晨磊段明宇刘学伟
Owner XI AN JIAOTONG UNIV
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