Accession Number:

AD0626438

Title:

FARFIELD PRESSURE OF RANDOMLY VIBRATING STRUCTURES OVER GIVEN FREQUENCY BANDS.

Descriptive Note:

Technical rept.,

Corporate Author:

J G ENGINEERING RESEARCH ASSOCIATES BALTIMORE MD

Personal Author(s):

• Greenspon,Joshua E.

Report Date:

1965-10-01

Pagination or Media Count:

14.0

Abstract:

A relation between the cross spectral density of the farfield pressure outside a surface surrounding a sound source is given 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 multipole expansion for the mean square farfield pressure in low frequency bands is derived using a free field Greens Function. An expression for the magnitude and directivity of the farfield mean square pressure from various types of motions in any frequency band is obtained. Author

Descriptors:

• FIELD THEORY
• SOUND
• UNDERWATER SOUND
• SOUND TRANSMISSION
• STRUCTURES
• VIBRATION
• HULLS(MARINE)
• GREENS FUNCTIONS
• CYLINDRICAL BODIES

Subject Categories:

• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE