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