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Performance testing method for wideband perforated plate

A test method and perforated plate technology, which can be applied to sound-producing instruments, use sonic/ultrasonic/infrasonic waves to analyze solids, instruments, etc., and can solve the problems of inability to change a single sound absorption peak, limitation, poor sound absorption effect, etc.

Active Publication Date: 2017-08-11
郭辰曦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, some research institutions have proposed a simplified form of active-passive combination of micro-perforated sound absorbers, that is, the loudspeaker based on the piezoelectric shunt damping circuit is placed in the micro-perforated cavity. This micro-perforated structure is suitable for absorbing medium and high frequency noise. Broadband noise absorption effect is poor
[0003] Ordinary micro-perforated sound-absorbing structures have only one resonant absorption peak, and the single sound-absorption peak cannot be changed without adding any acoustic modification
For the traditional large-aperture single-layer micro-perforated sound-absorbing structure, the absorption width is 2 octaves near the resonance frequency, so the resonant sound-absorbing characteristics of the ordinary micro-perforated sound-absorbing structure itself limit the micro-perforated sound-absorbing structure.

Method used

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  • Performance testing method for wideband perforated plate
  • Performance testing method for wideband perforated plate
  • Performance testing method for wideband perforated plate

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Effect test

Embodiment 1

[0057] Embodiment 1 of the present invention: a wide-band perforated plate, including a back plate 1, a plurality of first cavity bodies 2 and a plurality of second cavity bodies 3 are arranged on the back plate 1, and each adjacent two first cavity bodies A second cavity body 3 is arranged between the cavity bodies 2, the first cavity body 2 includes an A hole plate 4, the second cavity body 3 includes a B hole plate 5, and the A hole plate 4 and the B hole plate 5 are both It is a sound-absorbing panel provided with a plurality of small holes 6, and the distance between the A hole plate 4 and the back plate 1 is greater than the distance between the B hole plate 5 and the back plate 1.

Embodiment 2

[0058] Embodiment 2 of the present invention: a broadband perforated plate, including a back plate 1, on which a plurality of first cavities 2 and a plurality of second cavities 3 are arranged, and each adjacent two first cavities A second cavity body 3 is arranged between the cavity bodies 2, the first cavity body 2 includes an A hole plate 4, the second cavity body 3 includes a B hole plate 5, and the A hole plate 4 and the B hole plate 5 are both It is a sound-absorbing panel provided with a plurality of small holes 6, and the distance between the A hole plate 4 and the back plate 1 is greater than the distance between the B hole plate 5 and the back plate 1. The first cavity body 2 further includes a partition 7 vertically connected to the backplane 1 . The aperture diameter of the small hole 6 provided on the A hole plate 4 is larger than the aperture diameter of the small hole 6 provided on the B hole plate 5 . The distance between two adjacent small holes 6 on the A ho...

Embodiment 3

[0059] Embodiment 3 of the present invention: a broadband perforated plate, including a back plate 1, on which a plurality of first cavities 2 and a plurality of second cavities 3 are arranged, and every two adjacent first cavities A second cavity body 3 is arranged between the cavity bodies 2, the first cavity body 2 includes an A hole plate 4, the second cavity body 3 includes a B hole plate 5, and the A hole plate 4 and the B hole plate 5 are both It is a sound-absorbing panel provided with a plurality of small holes 6, and the distance between the A hole plate 4 and the back plate 1 is greater than the distance between the B hole plate 5 and the back plate 1. The first cavity body 2 further includes a partition 7 vertically connected to the backplane 1 . The aperture diameter of the small hole 6 provided on the A hole plate 4 is smaller than the aperture diameter of the small hole 6 provided on the B hole plate 5 . The distance between two adjacent small holes 6 on the A ...

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Abstract

The invention discloses a wideband perforated plate which comprises a back plate. The back plate is provided with a plurality of first hollow chambers and a plurality of second hollow chambers. A second hollow chamber is arranged between each two adjacent first hollow chambers. The first hollow chamber comprises a pore plate A, and the second hollow chamber comprises a pore plate B. The pore plate A and the pore plate B are sound absorbing plates with a plurality of pores. The distance between the pore plate A and the back plate is larger than that between the pore plate B and the back plate. The wideband perforated plate can effectively enlarge a sound absorbing band width and realizes high sound absorbing performance. Furthermore the performance testing method according to the invention has advantages of simple operation and high practicability.

Description

technical field [0001] The invention relates to a performance testing method of a broadband perforated plate, which belongs to the technical field of noise control. Background technique [0002] At present, some research institutions have proposed a simplified form of active-passive combination of micro-perforated sound absorbers, that is, the loudspeaker based on the piezoelectric shunt damping circuit is placed in the micro-perforated cavity. This micro-perforated structure is suitable for absorbing medium and high frequency noise, while The broadband noise absorption effect is poor. [0003] Ordinary micro-perforated sound-absorbing structures have only one resonant absorption peak, and the single sound-absorption peak cannot be changed without adding any acoustic modification. For the traditional large-aperture single-layer micro-perforated sound-absorbing structure, the absorption width is two octaves near the resonance frequency, so the resonant sound-absorbing charac...

Claims

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Application Information

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IPC IPC(8): G10K11/172G01N29/09G01N29/12
CPCG10K11/172G01N29/09G01N29/12G01N2291/018G01N2291/014G01N2291/023Y02T90/00
Inventor 郭辰曦
Owner 郭辰曦
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