Diffraction of Sound by Objects in the One-Wavelength Size Range.

Abstract

The diffraction of sound by hard geometrical shapes has been studied by the Method of Moments (MOM), a boundary element technique for solving the scalar Helmholtz integral equation. The scattered fields of several rectilinear shaped objects are analyzed. The problem of scattering by an axially-symmetric obstacle has been simplified by using the symmetry to reduce the computational load. The validity of the resulting procedure has been verified by comparing the MoM results for a flat circular disk illuminated by either a plane or spherical wave with the results obtained by the classical method of separation of variables and expansion in oblate spheroidal wave functions.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1997
Accession Number
ADA325438

Entities

People

  • Soon Y. Lee

Organizations

  • United States Army Center for Health Promotion and Preventive Medicine

Tags

Communities of Interest

  • Air Platforms
  • Biomedical
  • C4I

DTIC Thesaurus Topics

  • Acoustic Scattering
  • Acoustic Waves
  • Acoustics
  • Central Processing Units
  • Computational Fluid Dynamics
  • Computational Science
  • Computer Programs
  • Coordinate Systems
  • Differential Equations
  • Diffraction
  • Engineering
  • Gaussian Quadrature
  • Geometry
  • Integral Equations
  • Measurement
  • Three Dimensional
  • Wave Functions

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering