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Composite sound absorption structure based on combination of micro-perforated board with acoustic metamaterial

An acoustic metamaterial and micro-perforated plate technology, which is applied in the direction of sound-producing instruments, instruments, etc., to achieve the effect of improving the production process, increasing the number, and being easy to process.

Pending Publication Date: 2017-06-16
BEIJING MUNICIPAL INST OF LABOUR PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is how to widen the sound absorption bandwidth and enhance the sound absorption effect without increasing the complexity of the composite sound absorption structure

Method used

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  • Composite sound absorption structure based on combination of micro-perforated board with acoustic metamaterial
  • Composite sound absorption structure based on combination of micro-perforated board with acoustic metamaterial
  • Composite sound absorption structure based on combination of micro-perforated board with acoustic metamaterial

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] image 3 The aperture tested for the impedance tube is d=0.8mm, the perforation rate is 2%, the micro-perforated plate structure (shown by the dotted line curve in the figure) and the micro-perforated plate combined with the acoustic metamaterial composite sound-absorbing structure (Fig. Indicated by the solid line curve) in the sound absorption performance comparison curve in the case of cavity depth H=50mm, the micro-perforated plate combined with the acoustic metamaterial composite sound-absorbing structure has a unit hole with a diameter of D=50mm in the middle of the micro-perforated plate , the spacer divides the unit hole into 9 small areas arranged aperiodically, the film material is pasted on the spacer, and the quality block is fixed on the film unit. from image 3 From the sound absorption performance curve, we can see that the composite structure of the micro-perforated plate combined with the thin-film acoustic metamaterial has better sound absorption perf...

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Abstract

The invention relates to the field of acoustic panel absorber and discloses a composite sound absorption structure based on combination of a micro-perforated board with an acoustic metamaterial. The composite sound absorption structure comprises a cover plate, side plates, a bottom plate, thin-film units, separation racks and mass blocks. The cover plate and the bottom plate are opposite to each other at an interval; and the side plates are connected with the cover plate and the bottom plate tightly to form a sound absorption back cavity. A plurality of micro sound absorbing holes and a plurality of unit holes are formed in the cover plate; one thin-film unit and one separation racks are arranged in each unit hole; and the thin-film units are fixed at the separation racks. The separation racks separate the unit holes into a plurality of cells. Each mass block is attached to the thin-film unit of one cell in each unit hole. Therefore, the sound absorption bandwidth can be broadened on the premise that the complexity of the sound absorption structure of the micro-perforated board is not increased; and thus the sound absorption effect can be enhanced.

Description

technical field [0001] The invention relates to the technical field of sound-absorbing panels, in particular to a composite sound-absorbing structure of micro-perforated panels combined with acoustic metamaterials. Background technique [0002] The traditional perforated plate resonant absorption structure has a closed cavity behind each hole on the perforated plate, which is equivalent to many parallel "Helmholtz" resonators. When the frequency of the incident wave is consistent with the resonance frequency of the system, that is resonate. At this time, the reciprocating vibration of the air at the hole of the perforated plate reaches the maximum amplitude, and the friction and damping are also the largest, and the sound energy is converted into heat energy due to viscous loss, that is, the sound energy dissipation reaches the maximum. This is the resonance absorption structure of the perforated plate. The advantages. However, this structure also has its inherent disadvan...

Claims

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Application Information

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IPC IPC(8): G10K11/16G10K11/172
CPCG10K11/16G10K11/172
Inventor 盖晓玲邢拓李贤徽张斌
Owner BEIJING MUNICIPAL INST OF LABOUR PROTECTION
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