Siller, H. and Drescher, M. (2011) Investigation of engine tones in flight. In: Proceedings 17th AIAA / CEAS Aeroacoustics Conference (32nd Aeroacoustics Conference). AIAA. 17th AIAA / CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference), 05.06. - 08.06.2011, Portland, USA.
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Acoustic fly-over measurements with Boeing 747-400 aircraft have been performed in order to extend an existing noise data base for Airbus A319/20 and MD-11 aircraft with another widely used wide-body aircraft. The data were recorded with a large multi-arm spiral microphone array with 238 microphones which extended over an area of 42 by 35 m. The flight trajectories were determined using a combination of onboard flight recorder and GPS data and an array of laser distance meters on the ground. A linearised trajectory of the aircraft was determined for every fly-over in order to calculate frequency spectra for different emission angles at emission time by compensating the Doppler effect. Sound source maps were calculated using the standard beamforming algorithm and a deconvo- lution method for moving sources. Fly-over measurements were performed with different configurations in order to analyse airframe and engine noise sources separately. In this paper, the main focus is on the analysis of fly-overs with different engine speeds, but also, some results for landing gear noise are presented.
|Document Type:||Conference or Workshop Item (Paper, Poster)|
|Title:||Investigation of engine tones in flight|
|Journal or Publication Title:||Proceedings 17th AIAA / CEAS Aeroacoustics Conference (32nd Aeroacoustics Conference)|
|In ISI Web of Science:||No|
|Keywords:||Source localisation, fly-over, Beamforming, microphone array|
|Event Title:||17th AIAA / CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference)|
|Event Location:||Portland, USA|
|Event Type:||international Conference|
|Event Dates:||05.06. - 08.06.2011|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||Propulsion Systems|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L ER - Engine Research|
|DLR - Research theme (Project):||L - Turbine Technologies|
|Institutes and Institutions:||Institute of Propulsion Technology > Engine Acoustic|
|Deposited By:||Balbir Kaur|
|Deposited On:||20 Jan 2012 14:58|
|Last Modified:||09 Feb 2012 15:43|
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