变电站降噪方法研究 Research on Acoustic Noise Reduction Methods for Substation

采用穿孔板共振吸声结构用于变电站噪声治理，根据变电站噪声频率分布特性设计了共振吸声结构参数，并对共振结构吸声系数进行了数值仿真，得到其吸声谱在低频具有相对较大的吸声系数。对设计的穿孔板共振吸声结构进行了工程实验，利用设计的软件得到变电站的可听噪声倍频A计权声压级。分析了噪声治理前后的不同频带噪声的变化特性，测试结果表明所采用穿孔板共振吸声结构具有较好频率选择吸声特性，该结构大幅度地降低了变电站中的低频噪声，使变电站的噪声得到有效的控制。 This paper discusses the use of perforated plate resonant sound absorption structure for substation noise control. Based on the noise distribution characteristics of the substation, the resonant sound absorption structure parameters are designed, and the sound absorption coefficient of the resonant structure is numerically simulated. It is shown that the structure has a relatively large sound absorption coefficient at low frequency. Experiments are conducted to verify the perforated plate resonant sound absorption structure and a software is designed to obtain the substation audible noise frequency A weighted sound pressure level. The results show that the resonant sound absorption structure of the perforated plate has better frequency selection sound absorption characteristics, which greatly reduces the low frequency noise in the substation and makes the noise of the substation get effective control.