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Hybrid active and passive control of fan noise

机译:主动和被动混合控制风扇噪音

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This paper deals with the global reduction of axial flow fan noise in ducts in a building using a hybrid passive-active noise control method. The effectiveness of using an infra-red device as a reference signal source is also investigated. It is shown that using such a hybrid noise control system over an axial-flow fan reduces the overall sound pressure level by 5 dB(A) in the surrounding environment and global control of the blade passing frequency can also be achieved. This paper also shows that using an infra-red device as a reference signal source produces marginally better control as compared with using a microphone reference sensor. Moreover, long term stability is guaranteed and the possibility of acoustic feedback is eliminated.
机译:本文采用混合被动-主动噪声控制方法来解决建筑物管道中轴流风扇噪声的整体降低问题。还研究了使用红外设备作为参考信号源的有效性。结果表明,在轴流风扇上使用这种混合噪声控制系统,可以在周围环境中将整体声压级降低5 dB(A),并且还可以实现对叶片通过频率的整体控制。本文还显示,与使用麦克风参考传感器相比,使用红外设备作为参考信号源可产生稍微更好的控制。而且,保证了长期稳定性,并且消除了声反馈的可能性。

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