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Underwater sound absorption metamaterial structure of damping lining double-layer honeycomb perforated plate

A double-layer honeycomb and perforated plate technology, which is applied in the field of acoustic metamaterials, can solve problems such as poor low-frequency sound absorption performance, poor load-bearing performance, and heavy weight, so as to ensure load-bearing performance, improve low-frequency sound absorption performance, and reduce structural weight. Effect

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

[0005] The technical problem to be solved by the present invention is to provide an underwater sound-absorbing metamaterial structure of double-layer honeycomb perforated plate with damping lining , to solve the common problems of poor low-frequency sound absorption performance, heavy weight, and poor load-bearing performance in traditional underwater sound-absorbing structures

Method used

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  • Underwater sound absorption metamaterial structure of damping lining double-layer honeycomb perforated plate
  • Underwater sound absorption metamaterial structure of damping lining double-layer honeycomb perforated plate
  • Underwater sound absorption metamaterial structure of damping lining double-layer honeycomb perforated plate

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Effect test

Embodiment 1

[0059] The perforation diameter of the perforated upper panel is 2.5mm, the thickness of the perforated upper panel is 2.5mm, the height of the first layer of honeycomb layer core is 25mm, the inner side length of the first layer of honeycomb is 25mm, and the thickness of the first layer of damping inner lining 3mm, the perforation diameter of the interlayer perforated panel is 1.5mm, the thickness of the interlayer perforated panel is 1mm, the inner side length of the second honeycomb layer core is 25mm, the height of the second honeycomb layer core is 25mm, the second layer damping inner The thickness of the liner is 2mm.

Embodiment 2

[0061] The perforation diameter of the perforated upper panel is 4mm, the thickness of the perforated upper panel is 1.5mm, the height of the first layer of honeycomb layer core is 35mm, the inner side length of the first layer of honeycomb is 35mm, and the thickness of the first layer of damping inner lining is 2mm, the perforation diameter of the interlayer perforated panel is 2mm, the thickness of the interlayer perforated panel is 2mm, the inner side length of the second layer of honeycomb is 35mm, the height of the second layer of honeycomb layer core is 35mm, and the thickness of the second layer of damping inner lining is 3mm .

Embodiment 3

[0063] The perforation diameter of the perforated upper panel is 3mm, the thickness of the perforated upper panel is 3.5mm, the height of the first layer of honeycomb layer core is 40mm, the inner side length of the first layer of honeycomb is 40mm, and the thickness of the first layer of damping inner lining is 1mm , The perforation diameter of the interlayer perforated panel is 3mm, the thickness of the interlayer perforated panel is 3mm, the inner side length of the second layer of honeycomb is 40mm, the height of the second layer of honeycomb layer core is 20mm, and the thickness of the second layer of damping inner lining is 4mm.

[0064] see figure 2 , the Helmholtz resonance phenomenon at low frequencies can achieve perfect sound absorption in a certain frequency range. By pasting the damping lining layer on the inner wall of the honeycomb resonant cavity, the acoustic impedance characteristics of the structure are improved, and the rubber layer provides additional ac...

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Abstract

The invention discloses an underwater sound absorption metamaterial structure of a damping lining double-layer honeycomb perforated plate. The underwater sound absorption metamaterial structure comprises a perforated upper panel, a first-layer honeycomb layer core, a sandwich perforated panel, a second-layer honeycomb layer core and a lower panel which are connected in sequence from top to bottom;a plurality of honeycomb resonant cavity units are arranged in each of the first-layer honeycomb layer core and the second-layer honeycomb layer core; the perforated upper panel is periodically provided with first holes corresponding to each honeycomb resonant cavity unit of the first-layer honeycomb layer core structure, and the interlayer perforated panel is periodically provided with second holes corresponding to each honeycomb resonant cavity unit of the second-layer honeycomb layer core structure; a first damping lining layer is arranged in each honeycomb resonant cavity unit of the first-layer honeycomb layer core, and a second damping lining layer is arranged in each honeycomb resonant cavity unit of the second-layer honeycomb layer core. The underwater sound absorption metamaterial structure has excellent low-frequency sound-absorbing performance, good bearing performance and light weight performance, can be 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 acoustic metamaterials, in particular to an underwater sound-absorbing metamaterial structure of a double-layer honeycomb perforated plate with a damping lining. Background technique [0002] Acoustic metamaterials are artificial periodic composite structures with extraordinary acoustic properties different from natural materials, such as acoustic focusing, negative refraction, one-way transmission, acoustic cloaking, etc. In addition, the perfect absorption of low-frequency sound waves by deep subwavelength scale structures is also one of the important special properties of acoustic metamaterials. In aeroacoustics, perfect absorption based on the principle of Helmholtz resonance can be achieved through spatial winding or double-layer perforated structural design. Some of these structures also exhibit broadband absorption through the parallel connection of multiple units with different geometric paramete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/168G10K11/172B32B3/12B32B3/26B32B7/12B32B15/04B32B15/06B32B15/095B32B15/20B32B25/04B32B27/06B32B27/40B32B33/00
CPCG10K11/168G10K11/172B32B3/12B32B15/20B32B15/043B32B15/06B32B15/095B32B7/12B32B27/06B32B27/40B32B25/04B32B3/266B32B33/00B32B2307/10Y02T70/10
Inventor 辛锋先卢天健段明宇何伟于晨磊
Owner XI AN JIAOTONG UNIV
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