多路分离式PID模数混合主动噪声控制技术研究

针对机电产品具有的多谐频噪声特性，提出一种多路分离式模拟滤波与数字PID相位自动跟踪相结合的模数混合主动噪声控制方法，消声实验结果表明该方法在多谐频管道噪声消除中稳定有效。针对目前三维声场主动噪声控制工程应用难的状况，提出利用通风道或窗结构将三维声场聚声为一维声场实现主动噪声控制的工程技术并以干式变压器为对象进行探索研究。

Study on Multi-Channel Active Noise Control with Analogue-Digital Mixed PID

Aiming at the characteristics of multi-harmonic frequency noise that most of electromechanical products possess, a new approach called multi-channel active noise control with analogue-digital mixed PID technique is proposed in this paper. This approach combines both multi-analogue filtering and digital phase automatic tracking PID techniques. A test of noise reduction in the duct was carried out. The results show that approach performs well for reducing multi-harmonic frequency noise in the duct. Due to the difficulty in application of the active noise control technique in 3D sound field, the sound concentrator is used to transfer the sound field from 3D into 1D in order to apply the new approach. Meanwhile, the dry-type transformer is taken as an experiment object to verify this new approach.