Accession Number:

AD0477005

Title:

UNDERWATER SOUND RADIATION FROM A FINITE CYLINDER: GENERAL ANALYSIS,

Descriptive Note:

Corporate Author:

BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA

Report Date:

1965-03-15

Pagination or Media Count:

51.0

Abstract:

The sound radiation from vibrations of a finite, air-filled, thin cylindrical shell is studied by a multi-modal approach. The modes are classified according to their resonance characteristics and their efficiencies of coupling to sound. The results are used to assess radiation from a shell 6.4 ft long, 2.1 ft in radius, in the frequency range of about 100 to 300 cps. A survey of the modal properties indicates that radiation is due principally to i modes of gross motion of shell and end caps, and ii a few highly resonance, very poorly coupled lobar modes. The importance of the latter is determined by internal damping. A detailed analysis is given for the coupling of the lobar modes. Author

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE