Accession Number : AD0687130
Title : A METHOD FOR THE PREDICTION OF THE FARFIELD FROM NEARFIELD MEASUREMENTS OF THE AMPLITUDE ALONE.
Descriptive Note : Scientific rept.,
Corporate Author : PARKE MATHEMATICAL LABS INC CARLISLE MASS
Personal Author(s) : Butler,John L.
Report Date : MAY 1969
Pagination or Media Count : 20
Abstract : A method is presented for the prediction of the farfield from nearfield measurements of only the amplitude of a sound source. The method is based on a finite series expansion of the auto-power in the field. A numerical evaluation is given for a small theoretical source distribution under incoherent, partially coherent, and coherent conditions and it is shown that good results can be obtained if enough nearfield measurements are made. (Author)
Descriptors : (*SOUND TRANSMISSION, MATHEMATICAL PREDICTION), NUMERICAL ANALYSIS, SERIES(MATHEMATICS), PRESSURE, INTENSITY, MEASUREMENT, WAVE FUNCTIONS
Subject Categories : Acoustics
Distribution Statement : APPROVED FOR PUBLIC RELEASE