Abstract
The sound emissions of a large number of aircraft landing at the airport of Frankfurt/Main, Germany, were studied with an 8- by 8-m phased microphone array consisting of 111 irregularly distributed microphones. The data reduction procedure takes account of the motion of the sound sources. The measurement procedure is described and results for the directivity of flap side-edge noise of various aircraft types are reported. Flap side-edge noise is an important airframe noise source on many aircraft and can be clearly identified with the phased array. The variation of this noise source between different aircraft types is considerable, which indicates a substantial noise reduction potential. a)Permanent address: NW Polytechnical Univ., Xian, PROC.
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