Underwater sound absorption structure of damping lining hierarchical honeycomb perforated plate

A perforated plate and inner lining technology, applied in the direction of sound-generating devices, layered products, metal layered products, etc., can solve the problems of poor low-frequency sound absorption performance, heavy quality, poor load-bearing performance, etc., and achieve excellent low-frequency sound absorption Performance, improving low-frequency sound absorption performance, and ensuring the effect of structural load-bearing performance

Active Publication Date: 2020-10-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems in the prior art, the present invention provides an underwater sound-absorbing structure of honeycomb perforated plate with damping lining, which solves the common problems of poor low-frequency sound-absorbing performance, heavy quality and load-bearing performance of traditional underwater sound-absorbing structures. bad question

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  • Underwater sound absorption structure of damping lining hierarchical honeycomb perforated plate
  • Underwater sound absorption structure of damping lining hierarchical honeycomb perforated plate

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Embodiment 1

[0040] The central perforation diameter of the perforated upper panel is 3mm, the perforated upper panel node perforation diameter is 2mm, the perforated upper panel thickness is 3mm, the hierarchical honeycomb layer core height is 60mm, the central honeycomb side length is 30mm, the node honeycomb side length is 8mm, and the thickness of the central honeycomb damping inner lining is 3mm. The thickness of the node honeycomb damping lining is 3mm.

Embodiment 2

[0042] The central perforation diameter of the perforated upper panel is 2mm, the perforated diameter of the nodes of the perforated upper panel is 3mm, the thickness of the perforated upper panel is 2mm, the height of the hierarchical honeycomb layer core is 50mm, the side length of the central honeycomb is 15mm, the length of the node honeycomb side is 6mm, and the thickness of the central honeycomb damping lining is 2mm. The thickness of the node honeycomb damping lining is 1mm.

Embodiment 3

[0044] The central perforation diameter of the perforated upper panel is 5mm, the perforated diameter of the node of the perforated upper panel is 5mm, the thickness of the perforated upper panel is 1mm, the height of the hierarchical honeycomb layer core is 30mm, the side length of the central honeycomb is 45mm, the length of the node honeycomb side is 20mm, and the thickness of the central honeycomb damping inner lining is 4mm. The thickness of the node honeycomb damping lining is 5mm.

[0045] see figure 2 , the Helmholtz resonance phenomenon at low frequencies can achieve perfect sound absorption in a certain frequency range. The acoustic impedance characteristics of the structure are improved by pasting the damping lining layer on the side wall of the hierarchical honeycomb resonant cavity, and the rubber layer provides additional acoustic resistance and acoustic capacity, forming a Helmholtz-like resonance, making the present invention realize underwater perfect low-fr...

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Abstract

The invention provides an underwater sound absorption structure of a damping lining hierarchical honeycomb perforated plate. A perforated upper panel, a hierarchical honeycomb layer core and a lower panel are welded or glued to form a plurality of honeycomb resonant cavity units, and damping lining layers are adhered to the side walls and the bottom surfaces of a central honeycomb resonant cavityunit and node honeycomb resonant cavity units, so that the acoustic impedance characteristic of the structure is improved, and the low-frequency sound absorption performance of the structure is improved. On the premise that good low-frequency underwater sound absorption performance is achieved, the structural weight is reduced, and the structural bearing performance is guaranteed.

Description

technical field [0001] The invention relates to the field of underwater sound absorption, in particular to an underwater sound absorption structure of a damping liner layer honeycomb perforated plate. 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 parameters. But in hydroacoustics, due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162G10K11/172B32B1/08B32B3/12B32B3/26B32B7/12B32B15/01B32B15/06B32B15/095B32B25/04B32B27/06B32B33/00B32B15/18
CPCG10K11/172G10K11/162B32B3/266B32B3/12B32B15/011B32B15/06B32B15/095B32B25/04B32B27/06B32B1/08B32B7/12B32B33/00B32B2307/546B32B2307/718B32B2307/102
Inventor 卢天健辛锋先段明宇何伟于晨磊
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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