Accession Number:

AD0775886

Title:

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

Descriptive Note:

Corporate Author:

JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Report Date:

1974-01-01

Pagination or Media Count:

19.0

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 Greens 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

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustic Detection and Detectors
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE