Fractal sound absorbing superstructure

A superstructure and fractal technology, applied in the direction of sound-emitting devices, building components, building structures, etc., can solve problems such as expensive, unfavorable air circulation, thick sound-absorbing materials, etc.

Active Publication Date: 2016-12-07
HUNAN UNIV
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  • Abstract
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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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  • Fractal sound absorbing superstructure
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  • Fractal sound absorbing superstructure

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Embodiment Construction

[0022] figure 1 A fractal sound-absorbing superstructure is presented. The fractal sound-absorbing superstructure is a regular hexagon. 1 is the air domain of the fractal sound-absorbing superstructure. There are six equilateral triangular structures (2, 3, 4, 5, 6 and 7) on the periphery of the air domain, and the materials of the structures are relatively rigid materials (such as steel and aluminum alloy, etc.). The equilateral triangle structure contains the "zigzag" fractal sound wave channel. The first level fractal of the “zigzag” fractal sound wave channel is the “zigzag” fractal sound wave channel 10 constructed by the main frame 9 . The second level fractal of the "zigzag" fractal sound wave channel is the "zigzag" fractal sound wave channel 12 of all the structures of the subframe 11 derived from the main frame 9 . The third-level fractal of the “zigzag” fractal sound wave channel is the “zigzag” fractal sound wave channel 14 constructed by the third-level frame ...

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Abstract

The invention discloses a fractal sound absorbing superstructure comprising a regular hexagonal air region 1 and six equilateral triangular structures (2, 3, 4, 5, 6 and 7). Each equilateral triangle structure has a zigzag fractal acoustic wave channel comprising a first-level zigzag fractal acoustic channel 10, a second-level zigzag fractal acoustic wave channel 12 deriving from the first-level zigzag fractal acoustic wave channel 10, and a third-level zigzag fractal acoustic wave channel 14 deriving from the second-level zigzag fractal acoustic wave channel 12. Both ends of the zigzag fractal acoustic wave channel communicate with an external sound field 8 and the internal hexagonal air region 1, respectively. The fractal sound absorbing superstructure of the invention has two complete band gaps at low frequency, has a unipolar resonance and bipolar resonance phenomenon at the low frequency. The complete band gap, the unipolar resonance and the bipolar resonance make acoustic energy gather in the fractal sound absorbing superstructure and stop the acoustic wave from spreading forwards.

Description

technical field [0001] The invention relates to acoustic Mie resonance, sound-absorbing technology and acoustic superstructure, in particular to a fractal 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 the outside. In addition, if a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172E04B1/84
CPCE04B1/84E04B2001/8428G10K11/172
Inventor 夏百战李丽萍刘坚于德介
Owner HUNAN UNIV
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