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NAOSITE : Nagasaki University's Academic Output SITE > Faculty of Engineering > Bulletin > Reports of the Faculty of Engineering, Nagasaki University > Volume 27, No. 49 >

Measuring the Relative Strengths and Phases of a Set of Partially Coherent Sources


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Title: Measuring the Relative Strengths and Phases of a Set of Partially Coherent Sources
Authors: Hayashi, Hidechito / Fisher, M. J.
Issue Date: Jul-1997
Citation: 長崎大学工学部研究報告 Vol.27(49) p. 213-220, 1997
Abstract: The measurement of the characteristics of the acoustic field generated by a set of sources is very important to understand and to control the noise. In the 1970's, M. J. Fisher proposed the Polar Correlation Technique to solve this problem. The Polar Correlation Technique and the development of it indicate the relationship between the cross spectra measured in the acoustical far field and the distribution of source strengths. And it is proposed the method of a least squares error of cross spectra to estimate the source strength distribution at the case of aero-engine accurately. In the last report it is extended this method for the relative strengths of partially coherent sources. The results of this method was better than that with the direct calculating method. In the present work it is extended this method for the case of unknown characteristics not only the relative strength but also the phase between the array of partially coherent sources.
URI: http://hdl.handle.net/10069/14929
ISSN: 02860902
Type: Departmental Bulletin Paper
Appears in Collections:Volume 27, No. 49

Citable URI : http://hdl.handle.net/10069/14929

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