Carley, M., 2010. Analysis of the radiated information in spinning sound fields. Journal of the Acoustical Society of America, 128 (4), pp. 1679-1684.
The information content of a spinning sound field is analyzed using a combination of exact and asymptotic results, in order to set limits on how accurately source identification can be carried out. Using a transformation of the circular source to an exactly equivalent set of line source modes, given by Chebyshev polynomials, it is found that the line source modes of order greater than the source wavenumber generate exponentially small fields. Asymptotic analysis shows that the remaining, lower order, modes radiate efficiently only into a region around the source plane, with this region shrinking as the mode order is increased. The results explain the ill-conditioning of source identification methods; the successful use of low order models in active noise control; and the low radiation efficiency of subsonic jets.
|Item Type ||Articles|
|Departments||Faculty of Engineering & Design > Mechanical Engineering|
|Research Centres||Aerospace Engineering Research Centre|
|Publisher Statement||Carley_JASA_2010_128_4_1679.pdf: Copyright 2010 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in: Carley, M., 2010. Analysis of the radiated information in spinning sound fields. The Journal of the Acoustical Society of America, 128 (4), pp. 1679-1684 and may be found at http://dx.doi.org/10.1121/1.3478852|
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