Sound Transmission in a Half Channel and Surface Duct

Abstract

The normal mode solution of sound transmission has been used as the basis of an approximate (WKB) calculation. The attenuation of low frequency signals in a surface duct is shown to be proportional to f to the -5/3rds power where f is the frequency. The high frequency attenuation is based upon experimental data and is proportional to sq. rt. of f. The leakage of sound energy from the duct is used as a means to estimate the signal received beneath the duct. The theoretical results have compared with theoretical data. The surface duct attenuation formula fits the experimental data within the spread of the data.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1968
Accession Number
ADA061980

Entities

People

  • C. S. Clay

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Attenuation
  • Convergence Zones (Sonar)
  • Deep Oceans
  • Deep Water
  • Diffraction
  • Equations
  • Experimental Data
  • Frequency
  • Losses
  • Measurement
  • Reflection
  • Scattering
  • Sea Water
  • Sound Transmission
  • Transmission Loss
  • Water
  • Wave Equations

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Combustion and Flow Dynamics.