Accession Number : AD0755459

Title :   Propagation Loss as Predicted by Modified Ray Theory.

Descriptive Note : Technical rept.,

Corporate Author : WOODS HOLE OCEANOGRAPHIC INSTITUTION MASS

Personal Author(s) : Davis,James A.

Report Date : DEC 1972

Pagination or Media Count : 20

Abstract : Modified ray theory predicts a frequency dependent distortion of the sound field which is obtained by ordinary ray theory. One qualitative consequence of this distortion is the introduction of a caustic in problems where ray theory predicts a shadow boundary. In order to test this approximate theory and determine the significance of such effects, a computer program has been developed which computes propagation loss for a variety of problems which, while simple, are pertinent to underwater sound propagation. The results of a numerical investigation of propagation loss vs. range are presented as a function of frequency, material properties, and boundary conditions (unbounded, pressure release surface, and rigid boundary). Comparisons are made with ray theory and available exact solutions. (Author)

Descriptors :   (*UNDERWATER SOUND, DIFFRACTION), COMPUTER PROGRAMMING, GRAPHICS, STEEPEST DESCENT METHOD

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE