Normal Mode Theory of Underwater Sound Propagation from Directional Multipole Sources,

Abstract

Normal mode theory of underwater sound propagation, which so far has been established only for omnidirectional point sources, is developed here for the case of sources with arbitrary spatial extent and directionality. This is accomplished by expanding the source in a series of spherical multipole distributions. From the Green's function representation, the sound field is then obtained for arbitrary multipolarity of the source, and it simplifies considerably for a point multipole source. Results are illustrated by a calculation of range focusing effects in a channel with parabolic velocity profile using a dipole source. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1974
Accession Number
AD0775886

Entities

People

  • Anton Haug
  • H. Ueberall
  • Ronald D. Graves

Organizations

  • Johns Hopkins University Applied Physics Laboratory

Tags

DTIC Thesaurus Topics

  • Cooperation
  • Directional
  • Multipolarity
  • Omnidirectional
  • Orientation (Direction)
  • Physical Properties
  • Underwater Sound

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Combustion Dynamics and Shock Wave Physics.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)