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Acoustic metamaterial cell and metamaterial ventilation and noise reduction device comprising same

An acoustic metamaterial, learning cell technology, applied in new structures, new materials for vibration reduction and noise reduction in modern functional buildings, and high-end equipment, it can solve problems such as large space volume, poor low-frequency noise attenuation, and narrow anechoic frequency bands. , to achieve the effect of small overall volume, anechoic frequency bandwidth, and widened anechoic frequency band

Pending Publication Date: 2022-03-29
NAT UNIV OF DEFENSE TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional pipeline muffler design still has some shortcomings. For example, the resistance muffler needs a large space volume to effectively control low-frequency noise, and the muffler frequency band is narrow. Poor low frequency noise attenuation

Method used

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  • Acoustic metamaterial cell and metamaterial ventilation and noise reduction device comprising same
  • Acoustic metamaterial cell and metamaterial ventilation and noise reduction device comprising same
  • Acoustic metamaterial cell and metamaterial ventilation and noise reduction device comprising same

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Embodiment Construction

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0054] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

[0055] In addition, in t...

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Abstract

The acoustic metamaterial cell comprises a first acoustic cell, a second acoustic cell and a main ventilating duct, the first acoustic cell and the second acoustic cell are both of an annular cavity structure, the main ventilating duct is a center channel of the first acoustic cell and the second acoustic cell, the main ventilating duct, the first acoustic cell and the second acoustic cell are coaxially arranged, and the first acoustic cell and the second acoustic cell are communicated through the main ventilating duct. The main ventilating duct is communicated with the first acoustic cavity of the first acoustic cell through the acoustic opening in the first acoustic cell, the main ventilating duct is communicated with the second acoustic cavity of the second acoustic cell through the perforated plate on the second acoustic cell, and the second acoustic cavity is filled with a high-porosity energy-absorbing medium. Sound waves enter from an acoustic opening between the main ventilating duct and the first acoustic cavity and form a resonant cavity with the first acoustic cavity; sound waves enter from the perforated plate between the main ventilating duct and the second acoustic cavity and form a sound absorption cavity with the high-porosity energy absorption medium in the second acoustic cavity. The acoustic metamaterial cell has excellent noise elimination performance of low frequency, broadband and small size.

Description

technical field [0001] The invention belongs to high-end equipment (aircraft, rail trains, large ships, new transmission and transformation systems, high-tech electronics), modern functional buildings (highways, tunnels, waiting halls / halls, conference venues, recording / broadcasting halls, anechoic chambers) The field of new materials and new structures for vibration and noise reduction, specifically relates to an acoustic metamaterial cell used for noise reduction of ventilation pipelines and a metamaterial ventilation and noise reduction device containing it. Background technique [0002] As a channel for transporting materials, the ventilation pipeline structure is widely used in various occasions such as air conditioning and ventilation of military equipment, engine intake and exhaust, gas turbines, and engine room heat dissipation. It is one of the essential equipment to ensure the internal and external air circulation of the equipment. The main function of the pipeline...

Claims

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Application Information

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IPC IPC(8): G10K11/162
CPCG10K11/162
Inventor 郁殿龙张振方肖勇胡洋华温激鸿胡兵白宇
Owner NAT UNIV OF DEFENSE TECH
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