Underwater Sound Radiation from a Finite Cylinder: General Analysis

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.

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Document Details

Document Type
Technical Report
Publication Date
Mar 15, 1965
Accession Number
AD0477005

Entities

People

  • E. M. Jr Kerwin
  • P. W. Jr Smith

Organizations

  • BBN Technologies

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Impedance
  • Acoustic Propagation
  • Acoustic Resistance
  • Acoustics
  • Bandwidth
  • Bessel Functions
  • Classification
  • Directives
  • Frequency
  • Governments
  • Impedance
  • Mechanics
  • Military Research
  • New York
  • Radiation Resistance
  • Resistance
  • United States Government

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Nuclear and Radiation Engineering.
  • Structural Dynamics.