Wide low frequency acoustic absorber with folding space

Abstract

The invention provides a wide low frequency acoustic absorber with the folding space. The acoustic absorber includes a casing, a porous material layer and a winding body structure, wherein a top plateof the casing is a rigid perforation panel, the surface of the rigid perforation panel is provided with a through hole penetrating through an inner portion of the casing, a bottom plate of the casingis a rigid back plate, a sound absorbing cavity is formed inside the casing, the porous material layer and the winding body structure are disposed in the sound absorbing cavity, the porous material layer is disposed above the winding body structure, a gap is formed between the porous material layer and the winding body structure, the winding body structure includes two opposite rigid wall surfaces, opposite surfaces of the two rigid wall surfaces are provided with rigid plates which are perpendicular to the height direction of the casing in the height direction at equal intervals, the rigid plates on the two rigid wall surfaces are staggered, and the space between the rigid wall surfaces is divided into an S-shaped air passage. The acoustic absorber is advantaged in that the porous material layer and the winding body structure are integrated into one, and the relatively good noise abatement noise reduction effect is achieved.

Description

technical field [0001] The invention relates to a sound absorbing device in acoustics, in particular to a wide and low frequency acoustic absorber with folding spaces. Background technique [0002] With the rapid development of society, the environment in which we live has undergone tremendous changes. At the same time, people have a deeper understanding of noise. Noise can hinder people's normal life and rest, such as making people feel irritable, tense, fatigued, and even cause harm to people's hearing, nervous system, and cardiovascular. Therefore, there is an urgent need for an effective way to reduce noise, and the study of sound-absorbing materials is of great significance. [0003] Traditional sound-absorbing materials mainly include inorganic noise-reducing materials and resonant sound-absorbing structures. Inorganic noise-reducing materials such as asbestos fiber and glass fiber have good sound-absorbing performance and have the characteristics of light weight, n...

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: In order to solve the technical problems of thick sound-absorbing material, poor sound-absorbing effect and single-frequency sound absorption, the present invention proposes a wide and low-frequency acoustic absorber with folding space, which is a perforated with folding space Type sound-absorbing structural unit, which combines the winding structure and porous material into one, which has a good sound attenuation and noise reduction effect

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