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Multilayer micro-perforated plate sound absorption structure

A micro-perforated plate and sound-absorbing technology, applied in sound-generating equipment, layered products, instruments, etc., can solve the problems of general sound absorption performance and complex structure in the whole frequency band, and achieve good low-frequency sound insulation performance, high sound absorption coefficient, The effect of improving the sound insulation performance

Pending Publication Date: 2020-06-12
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure is complex, and it only has a relatively high noise reduction effect on noise within a certain range, so its sound absorption performance in the full frequency band is average.

Method used

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  • Multilayer micro-perforated plate sound absorption structure
  • Multilayer micro-perforated plate sound absorption structure
  • Multilayer micro-perforated plate sound absorption structure

Examples

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Embodiment Construction

[0022] The directions of the accompanying drawings are up, down, left and right.

[0023] Such as figure 1 The multi-layer micro-perforated plate sound-absorbing structure includes five frames 1 and four micro-perforated plates 2 arranged in series at intervals, and four sound-absorbing cavities 3 enclosed thereby.

[0024] Such as figure 2 , the outer dimension of the first frame body 1 from left to right is 4mm(W)×200mm(D)×300mm(H), and the inner dimension is 4mm(W’)×192mm(D’)×292mm(H’) , which is connected with the second frame body 1 to fix the first micro-perforated plate 2 . The outer dimension of the second frame body 1 is 23.5mm (W) × 200mm (D) × 300mm (H), the inner dimension is 23.5mm (W') × 192mm (D') × 292mm (H'), one end is connected with The first frame body 1 is connected to support the first micro-perforated plate 2, determine its position in the second frame body 1, and form the required sound-absorbing cavity 3 (D c =21mm); the other end is connected wit...

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Abstract

The invention discloses a multilayer micro-perforated plate sound absorption structure which comprises a frame body and a micro-perforated plate which are sequentially arranged at intervals, and a sound absorption cavity defined by the frame body and the micro-perforated plate. The frame body is a hollow right-angled hexahedron, and the micro-perforated plate is a right-angled hexahedron sheet. The total thickness of the frame body is 30-100 mm; through holes are uniformly distributed in the surface of the micro-perforated plate; the cross section of the through hole is circular or quadrilateral, and the size of the through hole is 0.1-1.0 mm; the perforation rate of the micro-perforated plate is 1.0-15.0%; the thickness of the micro-perforated plate is 0.1-1.0 mm; the number of the micro-perforated plates is 2-6; and the depth of the sound absorption cavity is 5-60 mm. Grooves are formed in one side of the frame body, and protrusions are arranged on the other side of the frame body, wherein the grooves are matched with the adjacent protrusion and are used for determining the position of the micro-perforated plate in the frame body and fixing the micro-perforated plate. The multilayer micro-perforated plate sound absorption structure is light in weight, small in surface density, high in full-band sound-absorbing coefficient and particularly good in low-frequency sound-absorbingperformance.

Description

technical field [0001] The invention relates to the field of sound-absorbing structures, in particular to a multi-layer micro-perforated plate sound-absorbing structure. Background technique [0002] Perforated panels are widely used in daily life. They can be used not only as decorative panels, but also as panels of porous sound-absorbing materials to enhance low-frequency sound-absorbing performance. The sound absorption coefficient of the traditional perforated plate is about 0.16. Since the sound resistance of the perforated plate itself is small, the sound absorption bandwidth of this structure is narrow, usually only tens to hundreds of hertz. Compared with the traditional perforated plate, the thickness of the sound-absorbing structure of the micro-perforated plate is generally less than 2mm, the perforation diameter is less than 1mm, and the perforation rate is less than 15%. Due to the structural characteristics of the micro-perforated plate, good sound-absorbing p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/168B32B3/24B32B3/26
CPCG10K11/168B32B3/266B32B2307/718B32B2307/72B32B2307/102
Inventor 解龙翔卢明辉钱斯文詹喆颜学俊
Owner NANJING UNIV
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