Accession Number : AD0609634

Title :   APPROXIMATION TO THE MEAN SQUARE FARFIELD PRESSURE OF RANDOMLY VIBRATING STRUCTURES AT LOW FREQUENCIES.

Descriptive Note : Technical rept. no. 12,

Corporate Author : J G ENGINEERING RESEARCH ASSOCIATES BALTIMORE MD

Personal Author(s) : Greenspon,Joshua E.

Report Date : NOV 1964

Pagination or Media Count : 16

Abstract : A relation between the cross spectral density of the farfield pressure outside a surface surrounding a sound source is derived in terms of cross spectral density of the normal acceleration over a surface surrounding the source. The cross spectral density of the acceleration is given in terms of the modes of the structure. A resulting simple formula for the mean square farfield pressure in low frequency bands is derived using simple source Green's Functions. (Author)

Descriptors :   (*CYLINDRICAL BODIES, ACOUSTICS), (*SOUND, CYLINDRICAL BODIES), (*STRUCTURES, VIBRATION), LOW FREQUENCY, PRESSURE, MATHEMATICAL ANALYSIS, GREEN'S FUNCTION

Distribution Statement : APPROVED FOR PUBLIC RELEASE