A flight test campaign with a Dauphin helicopter has been conducted by ONERA, in cooperation with Istres Flight Test Center (CEV). The objective was to investigate the possibility of localizing the noise sources radiated by the helicopter from measurements performed with an array of ground fixed microphones. This study is based on a method that works in frequency domain to successfully localize the airframe noise sources on an aircraft in flight. The acoustic sources identified in this framework are localized on the main rotor disk or on the fenestron depending on the frequency band and on the flight conditions. The results demonstrate the effectiveness of the method. Particularly the method has been applied to localize the blade vortex interaction noise sources that are dominant during descending flight. The results obtained for this flight condition are compared with the locations found by another method in the time domain from data collected with on-board microphones. Both methods give consistent source distributions on the main rotor disk.
Noise source localization on a Dauphin helicopter in flight
Lokalisierung von Schallquellen an einem fliegenden Dauphin-Hubschrauber
Journal of the American Helicopter Society ; 49 , 4 ; 425-435
2004
11 Seiten, 22 Bilder, 1 Tabelle, 16 Quellen
Article (Journal)
English
Noise Source Localization on a Dauphin Helicopter in Flight
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