2006 エンジン付き翼模型の騒音源探査

概要

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Source location technique belongs to noise reduction techniques if it brings about precise information on noise characteristics such as source position, frequency band, magnitude, etc., and helps to decide appropriate countermeasure. This paper describes an experiment of a two-dimensionally distributed microphone array that distinguishes concerning sound source from others in mean flow of a wind tunnel. A small jet engine installed on a half fuselage model was employed as sound source and operated in a low-speed wind tunnel of National Aerospace Laboratory. A panel with as many as 64 microphones was fabricated and settled below the jet engine. As results of multi-channel measurement and frequency-domain analysis, both jet noise source and fan noise source around the nacelle could be detected with high signal noise ratio.
社団法人日本機械学会の論文
2002-09-20