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Full-band super-structure sound absorber

A sound-absorbing body and full-band technology, which is applied to building components, building structures, and sound insulation, can solve the problems of high structural density and general low-frequency sound absorption performance, and achieve good sound absorption performance, compact structure, and long service life. Effect

Active Publication Date: 2021-05-11
NANJING UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution achieves the purpose of full-band noise reduction through the low-frequency sound insulation and mid-high frequency sound absorption of multi-layer composite materials, but the structure density of the low-frequency noise-reducing surface layer is relatively high, and the low-frequency sound absorption performance is average.

Method used

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  • Full-band super-structure sound absorber
  • Full-band super-structure sound absorber
  • Full-band super-structure sound absorber

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with drawings and embodiments.

[0022] Such as figure 1 The full-band superstructure sound-absorbing body shown includes a frame body 1, a front panel 2, a high-frequency sound-absorbing body 3, an intermediate-frequency resonant cavity 4, an impedance matching layer 5, and a low-frequency sound-absorbing body 6, and the front panel 2 and each absorbing body The sound body is fixed on the frame body 1 through a slot and a buckle. Superstructure sound absorbing body, its external dimensions are: 300mm (W) × 200mm (D) × 235mm (H).

[0023] see Figure 2-4 , the front panel 2 is a metal perforated plate with a thickness of 1 mm, a perforation diameter of 5.0 mm, and a perforation rate of 45%. The high-frequency sound absorbing body 3 is a sound-absorbing structure in which four layers of micro-perforated plates 31 are arranged in series. Each micro-perforated plate 31 is separated by a back cavity 32....

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Abstract

The invention discloses a full-band super-structure sound absorber. The full-band super-structure sound absorber comprises a frame body and a sound absorber body which is fixedly arranged in the frame body and used for absorbing noise, wherein the sound absorber body is sequentially provided with a front panel, a high-frequency sound absorber body, an intermediate-frequency resonant cavity, an impedance matching layer and a low-frequency sound absorber body in the sound source propagation direction; and the thickness of the sound absorber body in the sound source propagation direction ranges from 150mm to 400mm. The high-frequency sound absorber body is formed by arranging a plurality of micro-perforated plates in series, and a back cavity used for absorbing sound is formed between every two adjacent micro-perforated plates; the front panel is a metal perforated plate and plays a role in protecting the high-frequency sound absorber body; the intermediate-frequency resonant cavity is a regular quadrangular prism; the impedance matching layer is of an aerogel or film resonant structure; and the low-frequency sound absorber body is of a flat plate sound absorption structure of a resonant cavity array. The full-band super-structure sound absorber does not contain porous sound absorption materials, is good in environment resistance, long in service life, compact in structure, small in thickness and good in full-band sound absorption performance, and can be used for a silent chamber, a semi-anechoic chamber and a full-anechoic chamber.

Description

technical field [0001] The invention relates to a building sound-absorbing material, in particular to a full-band superstructure sound-absorbing body. Background technique [0002] With the development of science and technology, especially the rise and popularization of material science, people put forward higher requirements for sound-absorbing materials: sound-absorbing materials are developing in the direction of high performance, full frequency band, and lightweight. Traditional sound-absorbing materials can no longer meet the requirements for sound-absorbing performance in specific scenarios (such as semi-anechoic rooms, full-anechoic rooms, and quiet rooms). In view of this, the development of a full-band superstructure sound absorber is of great significance to improve the sound absorption performance of materials and improve the experimental environment conditions. [0003] At present, domestic sound-absorbing materials for specific scenes are generally in the form ...

Claims

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Application Information

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IPC IPC(8): E04B1/84E04B1/86
CPCE04B1/84E04B1/86E04B2001/8423E04B2001/8433E04B2001/8452
Inventor 解龙翔卢明辉黄唯纯钟雨豪
Owner NANJING UNIV
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