Micro-perforated plate with resonant sound absorption structure

A micro-perforated plate and resonant sound-absorbing technology, which is applied in the direction of sound-emitting devices and instruments, can solve the problems of inconvenient production and use, and achieve the effect of widening the sound-absorbing frequency band and high sound-absorbing performance

Active Publication Date: 2011-05-04
北京绿创声学工程股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For different sound absorption frequency ranges, choose to use sound insulation and sound absorptio

Method used

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  • Micro-perforated plate with resonant sound absorption structure
  • Micro-perforated plate with resonant sound absorption structure
  • Micro-perforated plate with resonant sound absorption structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Such as figure 1 As shown, the micro-perforated plate with a resonant sound-absorbing structure in Embodiment 1 includes a rigid wall 1, a micro-perforated plate 2, two rigid sides 3 arranged at both ends of the rigid wall 1, and between the rigid wall 1 and the micro-perforated plate 2 The cavities 4 and flexible or elastic materials 5 respectively provided at both ends of the micro-perforated plate 2 are used to connect the rigid sides 3 . The composition of the flexible or elastic material 5 includes materials such as polymer flexible sound-absorbing materials, springs and soft rubber, forming a flexible or elastic connection between the micro-perforated plate 2 and the rigid side 3 .

[0014] In this embodiment, the rigid wall 1 is mostly a conventional rigid material, which is used to support the micro-perforated plate with a resonant sound-absorbing structure, and if necessary, a supporting framework needs to be provided inside the rigid wall 1 . The materials of...

Embodiment 2

[0017] Such as figure 2 As shown, the micro-perforated plate with a resonant sound-absorbing structure in Embodiment 2 includes a rigid wall 1, a micro-perforated plate 2, a cavity 4 between the rigid wall 1 and the micro-perforated plate 2, and the two ends of the rigid wall 1 are connected to the The two ends of the corresponding micro-perforated plates 2 are directly connected by flexible or elastic materials 5 . The composition of the flexible or elastic material 5 includes polymer flexible sound-absorbing materials, springs, soft rubber and other materials, forming a flexible or elastic connection between the micro-perforated plate 2 and the rigid side 3 .

[0018] In this embodiment, the rigid wall 1 is mostly a conventional rigid material, which is used to support the micro-perforated plate with a resonant sound-absorbing structure, and if necessary, a supporting framework needs to be provided inside the rigid wall 1 . The materials of the micro-perforated plate 2 are...

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Abstract

The invention relates to a micro-perforated plate with a resonant sound absorption structure. The micro-perforated plate with the resonant sound absorption structure is characterized by comprising a rigid wall, a micro-perforated plate and a cavity which is formed between the rigid wall and the micro-perforated plate, wherein the two ends of the rigid wall are connected with the two ends of the micro-perforated plate through a flexible or elastic material respectively. In the sound wave absorption process of the micro-perforated plate with the resonant sound absorption structure, the distancebetween the micro-perforated plate and the rigid wall can be automatically adjusted and a semi-active resonant sound absorption structure is formed in the cavity between the micro-perforated plate and the rigid wall along with the variation of sound wave frequency and the influence of vibrating air flow. Therefore, the micro-perforated plate with the resonant sound absorption structure has highersound absorption performance in a wider frequency range, the sound absorption frequency band of the micro-perforated plate with the resonant sound absorption structure is greatly expanded, and the defect of a narrower sound absorption frequency band of a sound absorber of the micro-perforated plate with a rigid structure can be overcome. The micro-perforated plate with the resonant sound absorption structure can be widely used for the sound absorber, mufflers and various sound absorption and insulation structures to treat a noise environment caused by air power noise.

Description

technical field [0001] The invention relates to a sound insulation and sound absorption device, in particular to a micro-perforated plate with a resonant sound absorption structure. Background technique [0002] The advantages of micro-perforated plates with resonant sound-absorbing structure are high sound absorption coefficient, wide absorption frequency band, etc., so they are widely used in various fields of noise control. Ordinary micro-perforated plates with a resonant sound-absorbing structure leave a certain cavity behind the micro-perforated plate, which forms a resonant sound-absorbing structure together with the back plate, but when the parameters of the micro-perforated plate and the cavity behind it are determined, the structure The sound absorption performance is determined. The sound insulation performance of micro-perforated panels with resonant sound-absorbing structure mainly depends on the thickness of the back plate, and the sound absorption performance ...

Claims

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Application Information

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IPC IPC(8): G10K11/172
Inventor 张晓杰沈加曙武显亮
Owner 北京绿创声学工程股份有限公司
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