Frequency Spectrum Characteristics: Underwater Acoustic Propagation in Double Ducts

Abstract

The characteristics of phase and group velocity and propagation loss are investigated for low-order modes with phase velocities less then the maximum sound speed separating the ducts. Cross-duct and in-duct propagation are evaluated for the source and receiver in different and identical duct(s), respectively. Detailed numerical examples are presented concerning the characteristics of the band about each critical frequency displayed. The phase- integral method of ray theory provides good first-order approximations to the mode eigenvalues, the critical frequencies, and group velocity. (jhd)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1990
Accession Number
ADA221782

Entities

People

  • D. Gordon
  • Michael Pedersen
  • S. Edwards

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Acoustic Fields
  • Acoustic Propagation
  • Acoustics
  • Convergence Zones (Sonar)
  • Eigenvalues
  • Energy Bands
  • Equations
  • Frequency
  • Group Velocity
  • Integrals
  • Military Research
  • Phase Velocity
  • Spectra
  • Standards
  • Standing Waves
  • Step Functions

Fields of Study

  • Physics

Readers

  • Approximation Theory.
  • Wave Propagation and Nonlinear Chaotic Dynamics.