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On source radiationThe power output from given sources is usually ascertained via an energy flux integral over the normal directions to a remote (farfield) surface; an alternative procedure, which utilizes an integral that specifies the direct rate of working by the source on the resultant field, is described and illustrated for both point and continuous source distributions. A comparison between the respective procedures is made in the analysis of sound radiated from a periodic dipole source whose axis rotates in a plane, on a full or partial angular range, with prescribed frequency. Thus, adopting a conventional approach, Sretenskii (1956) characterizes the rotating dipole in terms of an infinite number of stationary ones along a pair of orthogonal directions in the plane and, through the farfield representation of the latter, arrives at a series development for the instantaneous radiated power, whereas the local manner of power calculation dispenses with the equivalent infinite aggregate of sources and yields a compact analytical result.
Document ID
19810025846
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Levine, H.
(Stanford University Palo Alto, Calif., United States)
Date Acquired
August 11, 2013
Publication Date
October 1, 1980
Publication Information
Publication: Acoustical Society of America
Subject Category
Acoustics
Accession Number
81A10250
Funding Number(s)
CONTRACT_GRANT: NCC2-55
Distribution Limits
Public
Copyright
Other

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