二次音源を利用した航空用ファン回転騒音の低減化の試み

概要

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An application of active noise control (ANC) to reduce spinning tone noise issued from a fan of a turbofan engine is reported in this paper. The ANC technique using the wave form synthesis is tested experimentally instead of the adaptive feed forward method because it is expected to provide noise reduction without spill over of control sound in far field. To realize the wave form synthesis, it is necessary to form desired spinning patterns spatially by a secondary sound source. First of all, we constructed a system to generate spinning patterns in a duct, then tested the performance of the secondary sound source. As results of ANC tests applied to spinning tone noise of a model fan, noise reduction of maximum 3dB in overall sound pressure level and that ranging from 2dB to 13dB in blade passage frequency are obtained in far field with little spill over.
社団法人日本ガスタービン学会の論文
1997-03-10