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Sound absorption superstructure

A superstructure and sound-absorbing technology, which is applied in the direction of sound-generating equipment, building components, building structures, etc., can solve the problems of thick sound-absorbing materials, unfavorable air circulation, and high price

Inactive Publication Date: 2017-05-10
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this noise reduction method will create a confined space, which is not conducive to the circulation of air in the confined space and the outside
In addition, if a better noise reduction effect is required, the selected sound-absorbing material is generally thick and expensive

Method used

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Examples

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Embodiment Construction

[0018] figure 1 A sound-absorbing superstructure unit cell is presented. The unit cell is a regular hexagon. 1 is the material area of ​​the unit cell, which is a material with high rigidity (such as steel and aluminum alloy, etc.). The regular hexagonal unit cells are equally divided into 12 right triangles, and the inside of each right triangle is a right triangle acoustic cavity 2 . The right triangle acoustic cavity 2 communicates with the external sound field 4 through a short resonant tube 3 . The right triangle acoustic cavity 2 and the short resonant tube 3 form a Helmholtz resonant cavity.

[0019] figure 2 A sound-absorbing superstructure is presented. The sound-absorbing superstructure is composed of regular hexagonal unit cells. 5 is a regular hexagonal air domain. The first outer layer of the regular hexagonal air domain 5 is 6 regular hexagonal unit cells, numbered 6, 7, 8, 9, 10 and 11 respectively. The boundary of each regular hexagonal unit cell is pa...

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Abstract

The invention discloses a sound absorption superstructure. The sound absorption superstructure comprises a regular hexagon air domain 5, six regular hexagon single cells (6, 7, 8, 9, 10 and 11) at the first layer of the periphery of the regular hexagon air domain 5, and twelve incomplete regular hexagon single cells (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 and 23) at the second layer of the periphery of the regular hexagon air domain 5. All single-cell Helmholtz resonant cavities communicate with an external sound field 4 through resonant short tubes. According to the invention, the sound absorption superstructure has single-pole resonance and bipolar resonance phenomena at a low frequency, single-pole resonance can generate a negative dynamic volume modulus, yet bipolar resonance can generate negative dynamic quality density. Due to the negative dynamic volume modulus and the negative dynamic quality density, sound energy is aggregated in the sound absorption superstructure, and thus sound waves are prevented from continuously spreading forward. Therefore, the sound absorption superstructure forms a wide band gap between a single-pole resonance frequency and a bipolar resonance frequency and prevents propagation of the sound waves through a resonant sound absorption mode.

Description

technical field [0001] The invention relates to acoustic resonance, sound-absorbing technology and acoustic superstructure, in particular to a unit cell structure and distribution of the sound-absorbing superstructure. Background technique [0002] Sound-absorbing and noise-reducing materials can be used in many occasions, such as noise reduction in cabins of transportation vehicles such as automobiles, airplanes, high-speed rail, and ships, noise reduction in buildings, noise reduction in household appliances such as indoor air conditioners, and so on. Taking the noise reduction design of a building as an example, it is generally necessary to use an airtight method to separate the indoor space and outdoor space of the building, and use suitable sound-absorbing materials to absorb the noise transmitted from the outdoors to the indoors. However, this noise reduction method will create a confined space, which is not conducive to the circulation of air in the confined space and...

Claims

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Application Information

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IPC IPC(8): G10K11/172E04B1/82E04B1/84
CPCE04B1/8209E04B1/84E04B2001/8476G10K11/172
Inventor 于德介夏百战代洪庆
Owner HUNAN UNIV
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