A composite low-frequency resonance sound-absorbing structure

Abstract

The invention relates to a composite low-frequency resonance sound absorption structure. The composite low-frequency resonance sound absorption structure is characterized by comprising a thin-plate resonance sound absorption structure and a micropunch resonance sound absorption structure; the thin-plate resonance sound absorption structure is a closed rectangular cube defined by a surface plate, a back plate and four first side plates, an air layer with a certain thickness is formed between the surface plate and the back plate; the micropunch resonance sound absorption structure is a closed rectangular cube defined by a micropunch surface plate, the surface plate of the thin-plate resonance sound absorption structure and four second side plates, and an air layer with a certain thickness is formed between the micropunch surface plate of the micropunch resonance sound absorption structure and the surface plate of the thin-plate resonance sound absorption structure. According to the composite low-frequency resonance sound absorption structure, the combination mode of arranging the micropunch resonance sound absorption structure in front and arranging the thin-plate resonance sound absorption structure in rear is adopted, and the double-layer resonance sound absorption structure is formed for 200 Hz noise and 100 Hz noise made by a transformer; therefore, the performance of sound absorbing the low-frequency noise of a transformer substation is better, frequency pertinence is higher, the vertical incidence acoustical absorption coefficient can be about 0.8, and obvious advantages are achieved compared with multi-hole sound absorption materials.

Description

technical field [0001] The invention relates to a sound-absorbing structure, in particular to a composite low-frequency resonance sound-absorbing structure designed for substation low-frequency noise. Background technique [0002] The noise of outdoor substations is one of the common noise sources in people's daily life. The main noise source is the transformer, and the noise characteristics of the transformer are mainly concentrated in low frequencies, namely 100Hz and 200Hz. At present, the main noise reduction measures for outdoor substations are sound insulation and noise reduction, and sound absorption and noise reduction measures are very rare. Sound absorption and noise reduction refers to the method of taking sound absorption measures to consume sound energy and reduce the sound power of noise. There are many types of sound-absorbing materials (structures), which can be divided into two categories according to their material results, namely porous sound-absorbing ma...

AI Technical Summary

Problems solved by technology

Commonly used porous sound-absorbing materials have better sound-absorbing effects on medium and high frequencies, but poorer sound-absorbing performance on low frequencies, and are prone to aging or deformation, so they are not suitable for outdoor use.

Although there are many types of resonant sound-absorbing structures, which have good sound-absorbing performance for low-frequency noise and can also be used outdoors, there is currently no resonant sound-absorbing structure designed specifically for the noise characteristics of substations.

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