Light composite type wide-frequency-band sound absorber

A composite, wide-band technology, applied in the field of sound absorption and noise reduction, can solve the problems of increasing the cost of the sandwich structure and achieve the effect of improving the sound absorption effect and noise reduction effect

Pending Publication Date: 2020-05-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common sandwich structure (such as filled corrugated, honeycomb, porous foam, etc.) has excellent mechanical, sound insulation and heat transfer characteristics. For sound absorption and noise reduction, better absorption can be obtained by opening micropores on the front panel. The sound effect is limited by the law of sound insulation quality, which leads to the increase of the cost of sandwich structure preparation, installation and transportation

Method used

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  • Light composite type wide-frequency-band sound absorber
  • Light composite type wide-frequency-band sound absorber
  • Light composite type wide-frequency-band sound absorber

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings, which are explanations rather than limitations of the present invention.

[0028] The present invention provides a side view of an example of a lightweight composite broadband sound absorbing body, such as figure 1 As shown, the micro-perforated composite panel is a sandwich structure filled with extremely thin porous materials. The lightweight composite micro-perforated panel sound absorber includes a micro-perforated composite panel 1 and a rigid backing wall 3; the micro-perforated composite panel 1 is composed of a micro-perforated front panel 11, a porous material 12 and a micro-perforated rear panel 13 after being glued together; Both the micro-perforated front panel 11 and the micro-perforated rear panel 13 are provided with sound-absorbing holes, and the direction of the holes is perpendicular to the panel surface, and may also have a certain inclinatio...

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Abstract

The invention relates to a light composite type sound absorber, and belongs to the field of environmental noise control. The light composite type sound absorber comprises a micro-perforated compositeboard and a rigid back lining wall, wherein the micro-perforated composite board comprises a micro-perforated front panel, a porous material and a micro-perforated rear panel which are sequentially superposed; sound absorbing holes are formed in the micro-perforated front panel and the micro-perforated rear panel; a back lining air layer is formed in a gap between the micro-perforated composite board and the rigid back lining wall; the thickness of the back lining air layer is at least five times that of the micro-perforated composite board; the micro-perforated composite board is of a sandwich structure, and is formed by superposing the micro-perforated front panel, the porous material and the micro-perforated rear panel, and the micro-perforated composite board is light in mass, and is high in specific strength; and meanwhile, the sound absorber has a relatively wide sound absorbing frequency band in medium-low frequency. The light composite type wide-frequency-band sound absorber issimple to prepare, is convenient to mount, and has wide market prospect in sound absorption and noise reduction in interior decoration and a limited space.

Description

technical field [0001] The invention relates to the field of sound absorption and noise reduction, in particular to a lightweight composite broadband sound absorption body. Background technique [0002] Noise can cause staff fatigue, and serious accidents will occur. Therefore, it is necessary to use sound-absorbing and noise-reducing structures to create a good working environment. [0003] Existing micro-perforated sound absorbers are widely used in the layout of large / small indoor scenes such as concert halls and conference rooms. The resonant sound absorption effect is achieved by having an air backing cavity behind the micro-perforated board, but there is a common problem with the micro-perforated board. The problem of low intensity and narrow sound absorption frequency band of the sound absorber. In industries such as transportation, interior design, and precision manufacturing, space and weight are crucial parameters that affect product competitiveness, and lightweig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04B1/86
CPCE04B1/86
Inventor 宁景锋李跃明
Owner XI AN JIAOTONG UNIV
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