Structural design and acoustic performance analysis of metamaterial muffler in substationnoise reduction

In recent years, the environmental impact of low-frequency noise in substations has gradually received attention. In response to the problem of low-frequency noise, this paper prepared anacoustic metamaterial muffler with the periodic structure through acoustic analysis and structural design. Theoretical calculation and experimental analysis show that with the number of periodic cavities in the muffler increases, the Aweighted insertion loss of the muffler increases from 6.9 dB to 10.6 dB, and the average insertion loss of the octave band increases from 5.7 dB to 9.8 dB. The low-frequency noise reduction effect is significantly improvedin this research, which will provide important reference for the theoretical calculation, engineering design, and substation noise reduction application of acoustic metamaterial mufflers.