AN ANALYSIS OF ECHOES FROM A SOLID ELASTIC SPHERE IN WATER

Abstract

IT IS WELL-KNOWN IN SONAR WORK THAT THE PULSE FORM OF A DIRECT ECHO FROM A TARGET BEARS LITTLE RELATION TO THE FORM OF THE ORIGINAL SIGNAL. This is true even for regularly shaped bodies, such as a sphere. In this study, the case of a homogeneous elastic sphere in water is examined theoretically and it is shown, in comparison with experimental results, that the observed effects originate from vibrations induced in the sphere by the incident sound. Calculated results are presented for a variety of solid materials, and it seems that echo forms could possibly provide information about the size and constitution of a sonar target.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1962
Accession Number
AD0274098

Entities

People

  • Robert Hickling

Organizations

  • California Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustics
  • Continuous Waves
  • Engineering
  • Engineers
  • Fluid Dynamics
  • Fluid Mechanics
  • Frequency
  • Government Procurement
  • Materials
  • Mechanical Engineering
  • Military Research
  • Munitions
  • Navy
  • New York
  • Optical Materials
  • Ordnance Laboratories
  • Physics Laboratories

Readers

  • Radar Systems Engineering.
  • Structural Dynamics.
  • Theoretical Analysis.