Main transformer noise characteristics analysis and composite sound insulation structure design
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.
Main transformer noiseLow frequency sound insulationPlate-type metamaterials with perfo-ratedMicroperforated panel
万方数据
维普
