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Straight-column type lattice enhanced local resonance underwater sound absorption structure

A local resonance and straight-column technology, applied in the field of straight-column lattice-enhanced local resonance underwater sound-absorbing structures, to achieve improved mechanical properties, excellent sound-absorbing performance, and lightweight design

Active Publication Date: 2019-09-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a straight-column lattice-enhanced local resonance underwater sound-absorbing structure to solve the problem of traditional local resonance phononic crystals under high hydrostatic pressure. Deformation, and cause the problem of acoustic performance degradation or even failure

Method used

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  • Straight-column type lattice enhanced local resonance underwater sound absorption structure
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  • Straight-column type lattice enhanced local resonance underwater sound absorption structure

Examples

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Effect test

Embodiment 1

[0055] The thickness of the panel is 2mm, the thickness of the damping layer is 32mm, the side length of the cell is 32mm, the radius of the rod is 2mm, the radius of the local resonator is 4mm, the distance between the left and right / front and rear adjacent local resonators is 2mm, and the distance between the two layers of local resonators is 2mm , the distance between the local resonance body on the first layer and the upper panel is 2mm.

Embodiment 2

[0057] The thickness of the panel is 2.5mm, the thickness of the damping layer is 40mm, the side length of the cell is 40mm, the radius of the rod is 2.5mm, the radius of the local resonance body is 5.5mm, the distance between the left and right / front and rear adjacent local resonance bodies is 1.5mm, and the two-layer local The distance between the resonators is 1mm, and the distance between the local resonators on the first floor and the upper panel is 1mm.

Embodiment 3

[0059] The thickness of the panel is 3mm, the thickness of the damping layer is 45mm, the side length of the cell is 45mm, the radius of the rod is 3mm, the radius of the local resonator is 7mm, the distance between the left and right / front and rear adjacent local resonators is 1mm, and the distance between the two layers of local resonators is 0.5 mm, the distance between the local resonance body on the first layer and the upper panel is 0.5mm.

[0060] Adopt above-mentioned material and structure dimension to carry out numerical simulation, the result that provides embodiment is as follows:

[0061] In terms of mechanical properties of the present invention, refer to figure 2 As shown in a, it is the relationship between the compressive load and the equivalent strain of the three embodiments of a straight-column lattice-enhanced local resonance underwater sound-absorbing structure. It can be seen from the figure that the compressive load borne by the present invention ha...

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Abstract

The invention discloses a straight-column type lattice enhanced local resonance underwater sound absorption structure, which includes a cell, the cell is of a square-shaped structure, a plurality of local resonators for sound absorption are distributed in the cell periodically, and a plurality of cell arrays are arranged to form the straight-column type lattice enhanced local resonance underwater sound absorption structure. The straight-column type lattice enhanced local resonance underwater sound absorption structure has the excellent sound absorption performance and the good water pressure resistant performance, meanwhile, lightweight design of the underwater sound absorption structure is realized, and the bearing-sound absorption-lightweight multifunctional integrated structure is achieved.

Description

technical field [0001] The invention belongs to the technical field of underwater sound absorption, and in particular relates to a straight-column lattice-enhanced local resonance underwater sound-absorbing 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. Compared with the Alberich-type sound-absorbing cladding, the local resonance phononic crystal has a more pressure-resistant structure and a wider sound-absorbing frequency range, so the local resonance phononic crystal has a wide range of engineering applications. [0003] The local re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172G10K11/162
CPCG10K11/172G10K11/162
Inventor 卢天健辛锋先段明宇于晨磊
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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