The noise impact of the main transformer of an ultra-high voltage substation has attracted widespread attention.The main transformer of a typical designed 500 kV substation A was taken as an example to test its noise situation.The results show that the main transformer noise energy is mainly con-centrated in the low and medium frequency range,and has the characteristics of line spectrum.For this noise characteristic,a composite acoustic insulation structure is proposed which is composed of a double-layer per-forated plate-type acoustic metamaterial and an interpolated microperforated panel.The composite structure is analyzed using transfer matrix theory and experimentally verified in an impedance tube.The experimental results show that the composite sound insulation structure has targeted sound insulation requirements,and the theoretical and experimental transmission loss curves basically match.
关键词
主变噪声/低频隔声/带孔板型超材料/微穿孔板
Key words
Main transformer noise/Low frequency sound insulation/Plate-type metamaterials with perfo-rated/Microperforated panel
维普
万方数据