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Straight-column type lattice-enhanced mixed underwater sound absorption structure

A mixed-type and straight-column technology, applied in the direction of sound-generating devices and instruments, to achieve excellent sound-absorbing performance, lightweight design, and good water pressure resistance

Inactive Publication Date: 2019-10-08
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a straight-column-type lattice-enhanced inclusion-type underwater sound-absorbing structure to solve the problem of traditional cavity-type sound-absorbing coatings and local resonance-type phonons. The crystal deforms under high hydrostatic pressure, which causes the degradation of acoustic performance or even failure, and it is difficult to reduce weight

Method used

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  • Straight-column type lattice-enhanced mixed underwater sound absorption structure
  • Straight-column type lattice-enhanced mixed underwater sound absorption structure
  • Straight-column type lattice-enhanced mixed underwater sound absorption structure

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Embodiment

[0063] Examples of materials:

[0064] Carbon fiber: Density 1450kg / m3, Young's modulus 80GPa, Poisson's ratio 0.1, equivalent isotropic loss factor 0.

[0065] Rubber: Density 1500kg / m3, Young's modulus 15MPa, Poisson's ratio 0.49, equivalent isotropic loss factor 0.6.

[0066] Steel: Density 7850kg / m 3 , Young's modulus 200GPa, Poisson's ratio 0.3, equivalent isotropic loss factor is 0.

[0067] Water: Density 1000kg / m3, sound velocity 1500m / s.

[0068] Air: Density 1.29kg / m3, sound velocity 343m / s.

[0069] The structure size of embodiment:

[0070] The side length of the cell is 36mm, the thickness of the panel is 2mm, the thickness of the damping layer is 46mm, the radius of the rod is 4.5mm, the height of the cavity is 3mm, the radius of the cavity is 16mm, the radius of the local resonator is 6mm, and the distance between the local resonator and the lower surface of the upper panel is 0.1mm.

[0071] Using the above materials and structural dimensions to carry out...

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Abstract

The invention discloses a straight-column type lattice-enhanced mixed underwater sound absorption structure. The straight-column type lattice-enhanced mixed underwater sound absorption structure comprises cubic cells; a cavity and a local resonance body are arranged in each cubic cell; the cavity and the local resonance body are located in the center of each cubic cell in the horizontal direction;the local resonance body is close to the top of each cubic cell; the cavity is located at the bottom of each cubic cell of a damping layer in the vertical direction; and the cubic cells are arrayed to form the straight-column type lattice-enhanced mixed underwater sound absorption structure. The underwater sound absorption structure disclosed by the invention has excellent sound absorption performance and good water pressure resistance, and meanwhile, the lightweight design of the underwater sound absorption structure is realized; and the underwater sound absorption structure is a multifunctional integrated structure with the functions of bearing, sound absorption, sound insulation and light weight.

Description

technical field [0001] The invention belongs to the technical field of pressure-resistant lightweight interlayer composite structure underwater sound absorption, and in particular relates to a straight-column lattice reinforced inclusion type underwater sound absorption structure. Background technique [0002] Sound waves are currently the only communication method that can transmit information over long distances underwater. Therefore, the shock and noise reduction of underwater detectors, submersibles and other equipment has always been a major engineering problem. Alberich-type sound-absorbing cladding and local resonance-type phononic crystals, as two typical underwater sound-absorbing structures, have been widely studied and applied in recent years. [0003] The above-mentioned Alberich-type sound-absorbing covering layer is an underwater sound-absorbing structure in which periodic cavities are embedded in a solid medium with damping effect. Generally, the structure is...

Claims

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Application Information

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