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Bubble acoustic metamaterial

A technology of acoustic metamaterials and bubbles, applied in the field of acoustic metamaterials, can solve problems such as low-frequency noise is difficult to effectively isolate, and achieve the effects of improving sound insulation, layout efficiency and overall stability

Pending Publication Date: 2021-01-19
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the low-frequency noise in the current ship field is difficult to effectively isolate, the present invention designs a bubble acoustic metamaterial, which can achieve good sound insulation effect in the low frequency range

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0040] A circular air bubble film is selected as a frame structure with a periodic structure, and the material of the circular air bubble film is polyester. The air bubbles are arranged in a square arrangement, and the thickness of the air bubble film is 0.1mm. figure 1 is the geometric parameter map of the bubble acoustic metamaterial. figure 2 A top view of a tetragonal array of circular bubble films. Will figure 2 The shown bubble film is folded and heat-press sealed into a pocket, and filled with glycerol to make the bubble acoustic metamaterial. Its properties are: H (thickness of bubble acoustic metamaterial) is 24 mm, L (interlayer spacing of bubble film) is 30 mm, D (bubble diameter) is 20 mm and T (bubble thickness) is 4 mm. The sound shielding effect of this bubble acoustic metamaterial was measured experimentally, and the simulated acoustic transmission spectrum obtained is as follows: image 3 shown. It has a sound shielding effect of more than 30dB in the r...

Embodiment 2

[0042] The elliptical bubble film is selected as the frame structure of the periodic structure, in which the bubbles are arranged in a square arrangement. The properties of the bubble film are: the material is polypropylene, the distance between the bubbles is 1 cm, and the number of bubbles per square decimeter of the bubble film is 20. Figure 4 A top view of a tetragonal elliptical bubble film.

Embodiment 3

[0044] The bubbles in the bubble film are arranged in a connected manner. The properties of the bubble film are: the material is polyethylene, the distance between the bubbles is 0.5 cm, and the number of bubbles per square decimeter of the bubble film is 30. Figure 5 is a top view of a membrane with interconnected bubbles.

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Abstract

The invention discloses a bubble acoustic metamaterial, and particularly discloses a metamaterial-based concept, which is characterized in that bubbles are stably fixed in water through a special frame structure by utilizing the compressibility of the bubbles, and the frequency corresponding to a sound insulation peak can be adjusted by changing the shape, the size and the spacing distance of thebubbles of a bubble film and the type of a filling medium. The sound insulation effect is further adjusted and improved. According to the bubble acoustic metamaterial, the bubble film can be made of alight polymer material, compared with a traditional film acoustic metamaterial, the design of an additional mass block is omitted, and the bubble acoustic metamaterial is simpler, more convenient andeasier to obtain. The single-layer structure units of the bubble acoustic metamaterial can achieve a low-frequency sound insulation effect, the bubble acoustic metamaterial can also be periodically arranged or assembled in a single-layer structure or a multi-layer structure so as to meet the actual size requirement on site, the arrangement efficiency and the overall stability are improved, and the bubble acoustic metamaterial can be widely applied to the fields of engineering, equipment and the like in ships.

Description

technical field [0001] The invention belongs to the technical field of acoustic metamaterials, in particular to a bubble acoustic metamaterial used for low-frequency noise control. Background technique [0002] With the rapid development of science and technology, the demand for noise control in industries such as engines, early warning aircraft, large highways, ships and automobiles is getting higher and higher. Traditional sound absorption and sound insulation technologies can only eliminate high-frequency noise, while low-frequency noise is difficult to control due to its strong penetration ability and long transmission distance. Traditional sound insulation materials follow the law of mass action, and generally achieve isolation of low-frequency noise by increasing the surface density of the material, which is not applicable in many occasions. [0003] Acoustic metamaterial is a periodic sub-wavelength composite material or structure with negative equivalent properties ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162
CPCG10K11/162
Inventor 宋延林王丽华蔡哲仁苏萌
Owner INST OF CHEM CHINESE ACAD OF SCI
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