Abstract: The principle of active noise control using multiple secondary sources and error sensors in free special acoustic field is introduced. According to the measured sound pressure of 110kV transformer’s noise, a low-frequency noise-control strategy is proposed for the transformer with the use of multi-source arrays. The influence of different numbers of secondary sources and error sensors and their special layout on the control effect is analyzed through numerical simulation. Theoretically, the more the secondary sources and error sensors are, the better the control effect is. But excessive secondary sources and error sensors will lead to increasing of channels of the control system, so that the control system is unlikely to be implemented. Finally, considering the feasibility of the control system in physical point of view, an optimal control system which can yield good control effect with relatively less secondary sources and error sensors is made.

Key words: acoustics, transformer noise, multiple sources, active noise control

摘要： 阐述自由声场中基于多点声源阵的有源噪声控制策略。结合实验测量的某型号110 kV变压器噪声数据，运用多声源阵有源控制策略对其低频噪声进行有源控制。通过对仿真结果分析，总结出控制系统中次级源与误差传感器个数、它们的空间排布对控制效果的影响规律。理论上次级源与误差传感器的个数越多，控制效果越好。但过多的次级源与误差传感器必然会使控制系统通道数增多且系统庞杂，导致系统难以实现。综合系统的物理可实现性，分析得出可实现的控制系统配置。取得良好的局部空间降噪效果，即取适中数目的次级源与误差传感器，在保证控制效果的同时系统易于物理实现。

关键词: 声学, 变压器噪声, 多声源阵, 有源控制