Sound Radiation from a Cylindrical Pipe Composed of Concentric Layers of Fluids and Elastic Solids.

Abstract

The cylindrical pipe is composed of a number of concentric layers of elastic solids and fluids. It is excited by time-harmonic mechanical point forces or acoustic sources. The exact linear equations of elastodynamics, visco-dynamics and acoustics are solved to obtain, via the finite element method, a matrix equation which connects interface displacements and external forces in the spectral domain. Far-field sound radiation and the wavenumbers of free-waves are obtained from this relation. Numerical results include a comparison of sound radiation levels obtained from the exact theory and a shell theory. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1983
Accession Number
ADA127316

Entities

People

  • E. A. Skelton

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Boundaries
  • Cartesian Coordinates
  • Composite Materials
  • Differential Equations
  • Dispersion Relations
  • Dispersions
  • Equations
  • Far Field
  • Finite Element Analysis
  • Frequency
  • Helmholtz Equations
  • Linear Differential Equations
  • Mathematical Analysis
  • Radiation
  • Wave Equations
  • Wave Propagation
  • Waves

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)