Accession Number:

AD0735133

Title:

Far Field Sound Patterns from Anisotropic Cylindrical Shells under Lateral Point Loading at Low Frequencies.

Descriptive Note:

Technical rept.,

Corporate Author:

J G ENGINEERING RESEARCH ASSOCIATES BALTIMORE MD

Personal Author(s):

• Greenspon,Joshua E.

Report Date:

1971-07-01

Pagination or Media Count:

63.0

Abstract:

The report presents an approximate theory and a computer program for calculating the far field sound radiation patterns from cross stiffened and sandwich cylindrical shells under lateral point loading. The far field radiation patterns are given for a range of low ka. It has been found that a practical structure at low frequencies acts as a dipole and then, as the frequency is increased, transforms into a quadrapole. As the frequency is increased further, the higher lobes come into the picture. Author

Descriptors:

• *SHELLS(STRUCTURAL FORMS)
• *SUBMARINE HULLS
• *VIBRATION
• ACOUSTIC PROPERTIES
• UNDERWATER SOUND
• LOADS(FORCES)
• COMPUTER PROGRAMS
• LOW FREQUENCY

Subject Categories:

• Marine Engineering
• Acoustics
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE