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:

1972-12-01

Pagination or Media Count:

20.0

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