Multi-cavity sandwich type micro-perforated plate silencing structure

A technology of micro-perforated plates and perforated plates, which is applied in the direction of sound-generating devices and instruments, can solve the problems of insufficient sound-absorbing ability in the middle and high-frequency bands, and insufficient structural strength of micro-perforated plate sound-absorbing structures, and achieve good structural mechanical properties.

Pending Publication Date: 2020-02-25
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a multi-cavity interlayer micro-perforated plate noise reduction structure to solve the insufficient structural strength of the existing micro-perforated plate noise reduction structure and the insufficient noise reduction capability in the middle and high frequency bands. the puzzle

Method used

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  • Multi-cavity sandwich type micro-perforated plate silencing structure
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  • Multi-cavity sandwich type micro-perforated plate silencing structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Two multi-cavity sandwich micro-perforated plate sound-absorbing structures are connected in series and have the same structural parameters. The thickness of the micro-perforated plate is 0.45mm, the perforation diameter is 0.4mm, and the perforation rate is 4%. mm, the perforation rate is 3.7%, the thickness of the unperforated sandwich panel is 0.4mm, the thickness of the shell is 2mm, the thickness of the partition is 1.5mm, the number of partitions is 6, the perforation rate of the partition area with micro-perforation is 4%, the diameter of the perforation 0.7mm, the diameter of the micro-perforated plate is 40mm, the cavity depth of the annular resonant cavity between the shell and the micro-perforated plate is 60mm, and the radii of curvature of the four sandwich plates with micro-perforated plates are 55mm, 55mm, 60mm, 60mm respectively, without perforation The radii of curvature of the two sandwich panels to be processed are 50mm and 50mm respectively, and the l...

Embodiment 2

[0054] The remaining parameters remain unchanged, only the number of partitions is changed to 8, the curvature radii of the 6 sandwich panels with micro-perforations are 50mm, 50mm, 55mm, 55mm, 60mm, and 60mm, and the curvature of the 2 sandwich panels without perforation The radii are 50mm and 50mm respectively.

Embodiment 3

[0056] The other parameters remain unchanged, only the number of partitions is changed to 10, the radii of curvature of the 8 sandwich panels with micro-perforations are 45mm, 45mm, 50mm, 50mm, 55mm, 55mm, 60mm, 60mm, and the 2 panels without perforation The radii of curvature of the sandwich panels are 50mm and 50mm respectively.

[0057] Adopt above-mentioned material and structure dimension to carry out numerical simulation, the result that provides embodiment is as follows:

[0058] see image 3 , is a schematic diagram of transmission loss in the range of 100-3000 Hz for three embodiments of a multi-cavity sandwich micro-perforated plate sound attenuation structure.

[0059] It can be seen from the figure that the average transmission loss of Embodiment 1 reaches 23.3dB within 100-1500Hz, and the average transmission loss within 1500-3000Hz reaches 24.7dB.

[0060] In Example 2, the average transmission loss within 100-1500 Hz reaches 24.6 dB, and the average transmissi...

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PUM

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Abstract

The invention discloses a multi-cavity sandwich type micro-perforated plate silencing structure. The silencing structure comprises a micro-perforated plate, wherein the micro-perforated plate is of acylindrical structure, and the exterior is provided with a shell; a resonance cavity of an annular structure is arranged between the shell and the micro-perforated plate; a plurality of partition plates are arranged between the shell and the micro-perforated plate in the radial direction; the partition plates divide the resonance cavity into a plurality of small resonant cavities with the same size; a sandwich plate is arranged in each small resonant cavity along the circumferential direction of the micro-perforated plate; a closed inner cavity is formed among the sandwich plates and the partition plates and the micro-perforated plate; a closed outer cavity is formed among the sandwich plates and the partition plates and the shell; and the shell and the two ends of the micro-perforated plate are connected through flanges. The micro-perforated silencing structure provided by the invention has the sound absorption performance of the medium-low frequency band and the medium-high frequencyband, is high in mechanical property, and is a multifunctional integrated structure for mechanically bearing-wide-frequency sound absorption.

Description

technical field [0001] The invention belongs to the technical field of broadband noise reduction, and in particular relates to a multi-cavity interlayer type micro-perforated plate noise reduction structure. Background technique [0002] Micro-perforated board is a new type of sound-absorbing structure. Compared with the sound-absorbing structure made of traditional resistive sound-absorbing materials, it does not require any porous sound-absorbing materials, and only has a large number of micro-holes on thin metal plates. The diameter of the hole is 0.5-1mm, the perforation rate is between 1%-5%, and there is a cavity with a certain depth after the perforation. The frequency bands to be absorbed vary. When absorbing low frequencies, intermediate frequencies, and high frequencies, the cavity sizes are 150-200mm, 80-120mm, and 30-50mm. In order to obtain the effect of broadband and high absorption, a double-layer micro-perforated plate structure is generally used. The doubl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172G10K11/168
CPCG10K11/172G10K11/168
Inventor 辛锋先周鑫栋段明宇
Owner XI AN JIAOTONG UNIV
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