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TitleComparison of methods for calculating the sound field due to a rotating monopole
Publication TypeJournal Article
Year of Publication2011
AuthorsPoletti, M.A., and Teal P.D.
JournalJournal of the Acoustical Society of America
Pagination3513 - 3520
Date Published2011
ISSN00014966 (ISSN)
KeywordsAcoustic field measurement, Acoustic fields, acoustics, article, comparative study, Comparison of methods, computer simulation, Equipment Design, Far-field, Harmonic analysis, Instantaneous frequency, instrumentation, Mach number, mathematical computing, Models, Theoretical, motion, Numerical Analysis, Computer-Assisted, Numerical approaches, Observation point, oscillometry, Point sources, pressure, rotation, Signal processing, Signal Processing, Computer-Assisted, sound, Spherical harmonics, theoretical model, time, Time Factors, Transmission time
AbstractA spherical harmonic expansion for the sound field due to a rotating oscillating point source has recently been derived. This paper provides further confirmation of the expansion results by comparing it with two known numerical approaches to determining the sound field. In the advanced time approach-applicable for Mach numbers below 1-the sound at transmission time determines the field at an observation point from the distance from source to observation point at the transmission time. In the retarded time approach the field at the observation point at the observation time is determined by solving for the retarded transmission times. The results from all three approaches are shown to be in good agreement. Expressions for the far-field instantaneous frequency are also derived and shown to agree with previous work. © 2011 Acoustical Society of America.

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