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Broadband sound absorber of low-pass sound filter bank

A filter bank and filter technology, applied in the direction of sound-producing equipment, instruments, etc., can solve the problems of difficult design and poor low-frequency sound absorption effect.

Pending Publication Date: 2021-10-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the common problems of sound-absorbing structures are: under the condition of strictly restricting the structure size, the sound-absorbing effect of medium and high frequencies is good, but the sound-absorbing effect of low-frequency is poor. acoustic performance, it will be very difficult to design

Method used

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  • Broadband sound absorber of low-pass sound filter bank
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  • Broadband sound absorber of low-pass sound filter bank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]Embodiment 1: as figure 1 shown

[0045] The low-pass acoustic filter bank broadband sound absorber consists of a micro-perforated plate 1, a cavity 2 behind the micro-perforated plate, a meandering sound wave main channel 4 communicating with the plate back cavity 2, and a main meandering sound wave channel 4 arranged along the meandering sound wave main channel 4. Low-pass acoustic filter bank composition;

[0046] The micro-perforated plate 1 has an external sound wave incident end on one side, and a cavity 2 is arranged on the other side. The cavity 2 is surrounded by side walls. The volume of the cavity 2 is calculated according to the area of ​​the micro-perforated plate 1 multiplied by its perforation Estimated by the numerical results of the rate, the end of the cavity 2 is connected to the beginning 3 of the main acoustic channel; the external incident sound wave enters the subsequent cavity 2 through the micro-perforated plate 1, and then enters the main acous...

Embodiment 2

[0051] Embodiment 2: as figure 2 shown

[0052] Embodiment 2 is basically the same as Embodiment 1, the main difference is:

[0053] The low-pass acoustic filter 13 is composed of a single cavity and a section of variable-section acoustic wave main channel communicated with the cavity;

[0054] The low-pass acoustic filter 14 is composed of a single cavity and a section of variable-section sound wave main channel communicated with the cavity, and the variable-section sound wave main channel extends to the inside of the cavity;

[0055] The low-pass acoustic filter 15 is composed of an interface cavity 8, an auxiliary cavity 9, a thin branch tube 7 communicating with the double cavities 8 and 9, and a section of equal-section sound wave main channel communicated with the interface cavity 8, and the thin branch tube 7 extends into the cavity;

[0056] The low-pass acoustic filter 16 is composed of an interface cavity 8, an auxiliary cavity 9, a thin branch tube 7 communicati...

Embodiment 3

[0058] Embodiment 3: as image 3 shown

[0059] The low-pass acoustic filter bank broadband sound absorber consists of a micro-perforated plate 1, a cavity 2 behind the micro-perforated plate, a meandering sound wave main channel 4 communicating with the plate back cavity 2, and a main meandering sound wave channel 4 arranged along the meandering sound wave main channel 4. Low-pass acoustic filter bank composition;

[0060] The micro-perforated plate 1 has an external sound wave incident end on one side, and a cavity 2 is arranged on the other side. The cavity 2 is surrounded by side walls. The volume of the cavity 2 is calculated according to the area of ​​the micro-perforated plate 1 multiplied by its perforation Estimated by the numerical results of the rate, the end of the cavity 2 is connected to the beginning 3 of the main acoustic channel; the external incident sound wave enters the subsequent cavity 2 through the micro-perforated plate 1, and then enters the main acou...

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Abstract

The invention discloses a low-pass sound filter bank broadband sound absorber. The broadband sound absorber comprises a micro-perforated plate, a micro-perforated plate rear cavity, a uniform-cross-section or variable-cross-section zigzag sound wave main channel communicated with the micro-perforated plate rear cavity, and a plurality of low-pass sound filters arranged from the inlet of the sound wave main channel along the sound wave main channel according to the sequence of cut-off frequencies from high to low, wherein one side of the micro-perforated plate is an external sound wave incident end, a cavity is arranged behind the other side, and a tail end of the cavity is communicated with an initial end of the sound wave main channel; external incident sound waves enter the cavity behind the micro-perforated plate through the micro-perforated plate and then enter the sound wave main channel through the cavity; the tortuous sound wave main channel is a tortuous and curved channel with a closed tail end, and is tightly arranged in the sound absorber in a single-layer or multi-layer mode; when the sound wave main channel is arranged in a multi-layer mode, the channels between the adjacent layers are communicated so as to ensure that the sound wave main channel is communicated from a starting end to a tail end. According to the broadband sound absorber of the low-pass sound filter bank, the requirement of a micro-perforated plate for absorbing phase propagation delay of sound waves of different central frequency bands can be met by adopting one sound wave main channel, and meanwhile, the ultra-thin structural size can be achieved by combining zigzag arrangement of the sound wave main channel.

Description

technical field [0001] The invention belongs to the technical field of vibration reduction and noise reduction, and relates to a low-pass sound filter group broadband sound absorbing body. Background technique [0002] At present, the common problems of sound-absorbing structures are: under the condition of strictly restricting the structure size, the sound-absorbing effect of medium and high frequencies is good, but the sound-absorbing effect of low-frequency is poor. Acoustic performance, the design will be very difficult. Contents of the invention [0003] The technical scheme that the present invention adopts is as follows: [0004] A low-pass acoustic filter group broadband sound absorber, comprising a micro-perforated plate, a cavity behind the micro-perforated plate, a meandering sound wave main channel communicated with the plate back cavity, and a low-pass sound wave arranged along the meandering sound wave main channel acoustic filter bank; [0005] The micro-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/16G10K11/162G10K11/04
CPCG10K11/16G10K11/162G10K11/002G10K11/04
Inventor 梅玉林王晓明王元秀
Owner DALIAN UNIV OF TECH
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