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Ultrathin low-frequency ventilation acoustic sound absorption unit and sound absorber

A sound absorber and sound absorption technology, applied in the field of acoustics, can solve problems such as difficult structural parameter design, complex structure of ventilation and sound absorbers, and large space outside the pipeline

Pending Publication Date: 2021-07-06
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some of the current sound absorbers cannot achieve high-efficiency broadband sound absorption and high ventilation performance at the same time, and occupy a large space outside the pipe
The structure of some ventilation and sound absorbers is too complex, and it is difficult to design the structural parameters more accurately according to the actual operating frequency

Method used

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  • Ultrathin low-frequency ventilation acoustic sound absorption unit and sound absorber
  • Ultrathin low-frequency ventilation acoustic sound absorption unit and sound absorber
  • Ultrathin low-frequency ventilation acoustic sound absorption unit and sound absorber

Examples

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the examples.

[0028] Such as Figure 1~4 As shown, the ultra-thin low-frequency ventilated acoustic sound-absorbing unit of the present invention includes an annular shell, specifically a circular outer shell 3, a circular inner shell 2, and an upper shell 1 and a lower shell 4 connecting the inner and outer shells. , the inner housing 2 is nested inside the outer housing 3; so that the inside of the housing is provided with an annular cavity 6, and the inner wall of the housing (ie, the inner housing wall) is provided with a through hole 5 through which the cavity 6 passes. The hole 5 communicates with the outside world; the through hole 5 serves as a short tube.

[0029] In actual use, several sound-absorbing units can be used to form a sound absorber, and the sound absorbers are closely arranged and connected in sequence along the sound propagation direction. The characteristic si...

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PUM

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Abstract

The invention discloses an ultrathin low-frequency ventilation acoustic sound absorption unit and a sound absorber. The ultrathin low-frequency ventilation acoustic sound absorption unit comprises an annular shell, wherein an annular cavity is formed in the shell, through holes are formed in the inner wall of the shell, the cavity is communicated with the outside through the through holes, and a plurality of sound absorption units are sequentially arranged and connected in the sound wave propagation direction to form the sound absorber. The ultrathin low-frequency ventilation acoustic sound absorption unit can realize high-efficiency absorption of low-frequency noise, guarantees ventilation performance, does not influence the external environment of the pipeline, is compact in structure, does not occupy extra space, and can flexibly adjust structural parameters according to specific absorption situations.

Description

technical field [0001] The invention relates to the field of acoustics, in particular to an acoustic sound absorber for low-frequency ventilation inside a pipeline. Background technique [0002] Most traditional sound absorbers absorb noise by adding porous fiber materials in the structure, but the sound absorption effect is poor in the low frequency range, and it will have a great impact on ventilation, and fiber materials are easy to accumulate dust and bacteria, which will affect the environment and Human health will be affected, and the effect of sound absorption and ventilation will be reduced. With the rapid development of acoustic metamaterials, many sound absorbers with sub-wavelength dimensions have been proposed and used for low-frequency noise control due to their good performance at low frequencies. However, some current sound absorbers cannot simultaneously achieve high-efficiency broadband sound absorption and high ventilation performance, and occupy a large s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172
CPCG10K11/172
Inventor 梁彬杨京程建春郜永鑫
Owner NANJING UNIV
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