Print Email Facebook Twitter Assessment of aircraft noise sources variability using an acoustic camera Title Assessment of aircraft noise sources variability using an acoustic camera Author Snellen, M. Merino Martinez, R. Simons, D.G. Faculty Aerospace Engineering Department Control and Operations Date 2015-12-31 Abstract Noise assessment around airports is hampered due to the observed large variability in noise levels for fly-overs of the same aircraft type, which is not considered by the current models. This paper assumes that the noise variability is due to variations in the aircraft emitted noise, neglecting the effect of the variable atmosphere, as previous work showed that its contribution is maximally 2 dB. In order to quantify and investigate the variability of noise levels during aircraft fly-overs, 115 measurements of noise of landing aircraft were taken using a 32 microphone array. The noise levels from Boeing 737 fly-overs were analyzed and the noise level variability was determined to be approximately 16 dB. After determining the engine settings from the spectrograms, it was found that variations on the engine settings explain over 55% of the observed total noise variation. In addition, by performing beamforming on the acoustic data, it was confirmed that airframe noise (from the landing gear and deployed flaps) is dominant for several frequencies, especially for modern aircraft. To reference this document use: http://resolver.tudelft.nl/uuid:d63eab6c-4cab-4ab2-ac14-d13d91837443 Publisher Delft University of Technology ISBN 978-1-906913-20-5 Source Proceedings of the 5th CEAS Air and Space Conference: Challenges in European Aerospace, Delft (The Nehterlands), 7-11 Sept. 2015 Part of collection Institutional Repository Document type conference paper Rights © 2015 The author(s). This work is licensed under the Creative Commons Attribution International License (CC BY) Files PDF 319502.pdf 1.17 MB Close viewer /islandora/object/uuid:d63eab6c-4cab-4ab2-ac14-d13d91837443/datastream/OBJ/view