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https://hdl.handle.net/2440/84194
Type: | Conference paper |
Title: | Localisation of a stationary time-harmonic dipole sound source in flows using time-reversal simulation |
Author: | Mimani, A. Doolan, C. Medwell, P. |
Citation: | Proceedings of Acoustics 2013 Victor Harbor: Science Technology and Amenity, Annual Conference of the Australian Acoustical Society, 17-20 November, 2013/ Terrance McMinn (ed.): 8p. |
Publisher: | Australian Acoustical Society |
Publisher Place: | CD ROM |
Issue Date: | 2013 |
ISBN: | 9780646912189 |
Conference Name: | Acoustics 2013 : Science, Technology and Amenity (2013 : Victor Harbor, South Australia) |
Editor: | Terrance McMinn, |
Statement of Responsibility: | Akhilesh Mimani, Con Doolan, Paul Medwell |
Abstract: | This work analyses the accuracy of numerical Time-Reversal (TR) simulations implemented using two different Time-Reversal Mirror (TRM) configurations for localising and characterising a stationary acoustic dipole source in a mean flow. The forward time evolution of the acoustic fields is simulated by means of the numerical solution of the inhomogeneous 2-D Linearised Euler Equations (LEE) with uniform subsonic mean flow. Only the acoustic pressure is recorded with two line arrays (LAs) of boundary nodes in a TRM corresponding to the top and bottom boundaries. The time-reversed acoustic pressure history is used as input data for simulating two numerical TR experiments; (a) one line array (LA) in a TRM corresponding to the top boundary and (b) two LAs in a TRM corresponding to the top and bottom boundaries. The Root-Mean-Square (RMS) of the time-reversed acoustic pressure field obtained by the first experiment indicates only one spatial maxima region (focal spot), therefore incorrectly suggests that the source is a monopole, whereas the second experiment correctly reveals the source to be a dipole. The local acoustic pressure history at two source locations is shown to be coherent with relative phase exactly equal to radian, thereby confirming the dipole source nature. This demonstrates that two LAs in a TRM located on either sides of the mean flow are required to take into consideration, the complete phase information and thereby accurately characterise a dipole. |
Rights: | Copyright © 2013, The Australian Acoustical Society |
Description (link): | http://www.acoustics.asn.au/conference_proceedings/AAS2013/ http://www.acoustics.asn.au/conference_proceedings/AAS2013/papers/AAS2013-Information.pdf |
Published version: | http://www.acoustics.asn.au/conference_proceedings/AAS2013/papers/p13.pdf |
Appears in Collections: | Aurora harvest 4 Mechanical Engineering conference papers |
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