Space bending porous superstructure with adjustable sound absorption frequency band and low-frequency broadband sound absorption performance

Abstract

The invention relates to a space bending porous superstructure with an adjustable sound absorption frequency band and low-frequency broadband sound absorption performance. The space bending porous superstructure comprises a left side plate, a right side plate, an upper panel, a bottom lining plate, a partition plate and a porous sound absorption material, wherein the left side plate, the right side plate, the upper panel, the bottom lining plate and the partition plate form a space bending channel, and the porous sound absorption material is embedded in the space bending channel. Under the condition that material thickness is not increased, the propagation path of sound waves is greatly increased, and sound energy loss is increased, so the superstructure has excellent low-frequency sound absorption performance; the superstructure has the advantage of large absorption bandwidth, and when the wave crest frequencies are similar, the superstructure has a sound absorption coefficient of 0.8 or above and has bandwidth of 220 Hz; a sound absorption frequency band can be adjusted by adjusting the channel number or channel layout of a space bending structure, and low-frequency broadband sound absorption can be achieved by arranging units of different sound absorption frequency bands in parallel; and the superstructure is simple in structure, easy to produce and low in cost, and has wide engineering application prospects in a low-frequency noise field.

Description

technical field [0001] The invention belongs to the field of composite structural acoustic metamaterials combining porous sound-absorbing materials and bending channels, in particular to a space-bent porous superstructure with adjustable sound-absorbing frequency band and low-frequency broadband sound-absorbing. Background technique [0002] Social life noise has replaced industrial noise and traffic noise as the most important source of noise pollution affecting urban residents' residential acoustic environment. noise source. For low-frequency noise, traditional sound-absorbing materials need a thickness equivalent to the wavelength to achieve the ideal sound-absorbing effect, which brings great inconvenience to engineering applications and increases the cost of noise control. [0003] The space bending superstructure has good low-frequency sound absorption performance, good structural strength and small thickness, but the structure has a narrow sound absorption bandwidth,...

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is: in view of the deficiency of traditional sound-absorbing materials and space bending superstructures in low-frequency and broadband sound absorption and the inconvenience of engineering applications, the present invention proposes a method based on traditional porous sound-absorbing materials and space bending superstructures. The low-frequency sound-absorbing superstructure of the structure; by embedding traditional porous sound-absorbing materials in the channels of the bent structure, the propagation path of sound waves in the structure is increased without increasing the thickness of the sound-absorbing layer, thereby solving the problem of traditional sound-absorbing The thickness of the material is restricted by the low-frequency sound absorption, and the sound absorption bandwidth of the space bending structure is narrow, etc.

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