A new design of sound-absorbing structure for prefabricated substation

Abstract

As the prefabricated substation adopts the enclosure partition wall structure with light steel double-layer thin plate, the impact of its low-frequency noise on the environment is bound to be more prominent. This paper analyses the main causes and characteristics of noise in fabricated substations. The main source of noise in fabricated substations is transformers. The low-frequency components of the noise generated by them account for a relatively large proportion. The sound pressure level of noise is the highest at 200Hz and 315Hz. In order to reduce the impact of noise on the environment, this article introduces several low-frequency sound absorption and sound insulation structures used, analyses their principles, and proposes a sound absorption and sound insulation enclosure structure suitable for prefabricated power stations to improve its low-frequency sound absorption performance. By arranging diaphragm ribs, the structure moves the resonant frequency band to high frequency, which improves the sound insulation of low frequency. Owing to the adoption of more ribs and stiffening plates, the number of resonance peaks in the low frequency band is reduced, which is beneficial to the sound insulation performance of the double-layer structure. A fireproof board is added between the inner and outer partitions to reduce the influence of the gap on the sound insulation and improve the fireproof performance of the structure. The final sound insulation at low frequencies is higher than 40dB, which will greatly improve the noise pollution to the environment.