Accession Number : AD0742490

Title :   Averaged Sound Transmission in Range-Dependent Channels.

Descriptive Note : Final rept.,

Corporate Author : BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS

Personal Author(s) : Smith,Preston W. , Jr

Report Date : 28 JAN 1972

Pagination or Media Count : 67

Abstract : An integral formula is derived as an estimate of the averaged, steady-state transmission ratio for two points in a channel where the environmental parameters vary slowly with range. The derivation is based on the theory of ray acoustics with lossy specular reflection from the boundaries. The averaging eliminates all but gradual changes with range of the transmission loss (TL); dependence on the depth of each point is retained. The formulation is applied to an isogradient channel with constant bottom slope; analytical approximations for TL are derived. (Author)

Descriptors :   (*UNDERWATER SOUND, SOUND TRANSMISSION), INTEGRAL EQUATIONS, ANALYTIC GEOMETRY, APPROXIMATION(MATHEMATICS), SNELLS LAW, CURVE FITTING, ATTENUATION

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE