Damping lining hexagonal honeycomb perforated plate underwater sound absorption metamaterial

A technology of perforated plates and metamaterials, which is applied in the direction of sound-generating devices, chemical instruments and methods, instruments, etc., can solve the problems of poor low-frequency sound absorption performance, poor load-bearing performance, and heavy quality, and achieve good lightweight performance and improve low-frequency Sound absorption performance, effect of reducing structural weight

Pending 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 supermaterial with a damping liner hexagonal honeycomb perforated plate, which solves the common problems of poor low-frequency sound absorption performance, heavy weight, and load-bearing performance in traditional underwater sound-absorbing structures. bad question

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  • Damping lining hexagonal honeycomb perforated plate underwater sound absorption metamaterial
  • Damping lining hexagonal honeycomb perforated plate underwater sound absorption metamaterial
  • Damping lining hexagonal honeycomb perforated plate underwater sound absorption metamaterial

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Effect test

Embodiment 1

[0040] The thickness of the perforated upper panel is 5mm, the diameter of the perforation is 2mm, the inner side length of the honeycomb is 25mm, the height of the honeycomb layer core is 50mm, and the thickness of the inner lining of the damping layer is 4mm.

Embodiment 2

[0042] The thickness of the perforated upper panel is 4mm, the diameter of the perforation is 3mm, the inner side length of the honeycomb is 30mm, the height of the honeycomb layer core is 40mm, and the thickness of the damping inner lining is 2mm.

Embodiment 3

[0044] The thickness of the perforated upper panel is 2mm, the diameter of the perforation is 4mm, the inner side length of the honeycomb is 40mm, the height of the honeycomb layer core is 30mm, and the thickness of the damping inner lining is 1mm.

[0045] 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 acoustic resistance and acoustic capacity, forming a Helmholtz-like resonance, so that the present invention realizes underwater low-frequency Absorbs sound perfectly.

[0046] see figure 2 , the sound absorption coefficient of Example 1 is greater than 0.5 at 189~328Hz, the half-sound absorption bandwidth is 54%, and perfect sound absorption is achieved at 257Hz, and the peak value of the sou...

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Abstract

The invention provides a damping lining hexagonal honeycomb perforated plate underwater sound absorption metamaterial. A plurality of honeycomb resonant cavity units are formed by welding or gluing aperforated upper panel, a honeycomb layer core and a lower panel, and damping lining layers are adhered to the side walls and the bottom surfaces of 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. According to the light honeycomb sandwich plate structure, onthe premise that good low-frequency underwater sound absorption performance is achieved, the weight of the structure is reduced, the bearing performance of the structure is guaranteed, and the problems that a traditional underwater sound absorption structure is generally poor in low-frequency sound absorption performance, heavy in weight and poor in bearing performance are solved.

Description

technical field [0001] The invention relates to the field of underwater sound absorption, in particular to an underwater sound-absorbing supermaterial of a hexagonal 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 the structural design of spatial winding or hierarchical perforation. Some of these structures also exhibit broadband absorption through the parallel connection of multiple units with different geometric parameters. But ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162G10K11/172B32B1/08B32B3/12B32B3/26B32B7/12B32B15/01B32B15/18B32B15/06B32B15/095B32B25/04B32B27/06B32B33/00
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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