Author
M.A. McCormick
Bio: M.A. McCormick is an academic researcher from Rolls-Royce Limited. The author has contributed to research in topics: Turbofan & Noise. The author has an hindex of 1, co-authored 1 publications receiving 80 citations.
Topics: Turbofan, Noise, Microphone
Papers
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TL;DR: In this paper, a single microphone output is de-Dopplerized, and results from a Lockheed TriStar graphically illustrate the capability of the de-dopplerization for the analysis of noise from counterrotating propeller driven aircraft.
87 citations
Cited by
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Delft University of Technology1, German Aerospace Center2, Institut national des sciences Appliquées de Lyon3, Langley Research Center4, Rolls-Royce Deutschland5, Brandenburg University of Technology6, Technical University of Berlin7, Peking University8, École de technologie supérieure9, École centrale de Lyon10
TL;DR: This paper provides a review of the most well-known and state-of-the-art acoustic imaging methods and recommendations on when to use them, as well as a broad overview for general aeroacoustic experts.
Abstract: Phased microphone arrays have become a well-established tool for performing aeroacoustic measurements in wind tunnels (both open-jet and closed-section), flying aircraft, and engine test beds. This paper provides a review of the most well-known and state-of-the-art acoustic imaging methods and recommendations on when to use them. Several exemplary results showing the performance of most methods in aeroacoustic applications are included. This manuscript provides a general introduction to aeroacoustic measurements for non-experienced microphone-array users as well as a broad overview for general aeroacoustic experts.
199 citations
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TL;DR: The main concepts of beamforming, starting from the very basics and progressing on to more advanced concepts and techniques are presented, in order to give the reader the possibility to identify concepts and references which might be useful for her/his work.
191 citations
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26 Mar 2001TL;DR: In this paper, a method for the location of moving sources by a microphone array is described, which can be applied to out-of-flow measurements in an open jet wind tunnel.
Abstract: A method is described for the location of moving sources by a microphone array. This method can be applied to out-of-flow measurements in an open jet wind tunnel. For that purpose, an expression is derived for the pressure field of a moving monopole in a uniform flow. It is argued that the open jet shear layer does not form a serious obstacle. A technique is described for reconstruction of power spectra with high signal/noise ratio. The method was implemented for rotating sources, resulting in the computer program ROSI ("Rotating Source Identifier"). Applications of ROSI are given for rotating whistles, blades of a helicopter in hover and wind turbine blades. The test with the rotating whistles demonstrated convincingly the capability to reconstruct the emitted sound. On the helicopter blades, rotating broadband noise sources were made clearly visible. On the wind turbine blades, noise emitted from the leading and trailing edge could be distinguished well.
Paper presented at the 7th AIAA/CEAS Aeroacoustics Conference, Maastricht, The Netherlands, 28-30 May 2001.
134 citations
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17 Oct 2010100 citations