Analysis of the radiated information in spinning sound fields

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Abstract

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.
LanguageEnglish
Pages1679-1684
Number of pages6
JournalJournal of the Acoustical Society of America
Volume128
Issue number4
DOIs
StatusPublished - Oct 2010

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Analysis of the radiated information in spinning sound fields. / Carley, Michael.

In: Journal of the Acoustical Society of America, Vol. 128, No. 4, 10.2010, p. 1679-1684.

Research output: Contribution to journalArticle

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