Numerical Evaluation of Low Frequency Sound Propagation in Layered Media.

Abstract

A horizontally layered system of fluids and solids is bounded above and below by half-spaces which may be solid or fluid. The method of dynamic stiffness coupling is used to obtain a matrix relation connecting 'spectral' displacements and external stresses at the interfaces. The pressure due to a time-harmonic acoustic point source is obtained, via this matrix relation, by numerical evaluation of a Hankel transform; 'exactly' using a Gaussian quadrature formula and approximately using the FFT algorithm. Numerical results demonstrate that the Fortran programs are a valuable tool for predicting short-range sound propagation at low frequencies. Additional keywords; Elastic layer, Viscous fluid layer, Acoustic fluids, Computer applications, Numerical analysis, Great Britain, Charts, Minicomputers, and Finite element analysis. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1985
Accession Number
ADA152690

Entities

People

  • E. A. Skelton

Tags

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Waves
  • Acoustics
  • Computational Science
  • Computations
  • Equations
  • Equations Of Motion
  • Fast Fourier Transforms
  • Finite Element Analysis
  • Frequency
  • Gaussian Quadrature
  • Integrals
  • Numerical Analysis
  • Numerical Integration
  • Secondary Waves
  • Wave Equations
  • Waves

Fields of Study

  • Engineering

Readers

  • Computational Fluid Dynamics (CFD)
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Wave Propagation and Nonlinear Chaotic Dynamics.

Technology Areas

  • Space