SCIENTIFIC ABSTRACT GAZARYAN, YU.L. - GAZDAROV, M.

• Document Type: CREST
• Collection: Scientific Abstracts
• Document Number (FOIA) /ESDN (CREST): CIA-RDP86-00513R000514530005-8
• Release Decision: RIF
• Original Classification: S
• Document Page Count: 100
• Document Creation Date: November 2, 2016
• Document Release Date: July 19, 2001
• Sequence Number: 5
• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

,jat &.r,7T.1 Tit L
T L~~ .
C-, A zARYA N L -
"On 'Waveguide rroyagation -in Inhomogeneous Mediat'.
Abstracted for inclusion in the Second International Congress on Acoustics,
Cambridge, Mass., 17-24, Jun 1956
Acoustical Institute of AS, USSR, Moscow

Category : USSR/Acoustics Sound vibrationa and waves J-2
Abs Jour : Ref Zhur - Fizika, No 1) 1957,No 2101
Author : Gazaryan. Yu. L.
lnst : -Aeoustles M-sTTIISM, Academy of Sciences USSR
Title :Concerning Waveguide Propagation of Sound in lion-Uniform Media
Orig Pub :Akust. Zh., 1956, 2, No 2, 133-136
Abstract :Analysis cf the field of a point-source harmonic radiator, placed in an
unevenly stratified medium, in which the speed of sound varies in the man-
ner indicated by Epstein (smooth transition layer between two h=ogeneous
half-spaces). An integral representation of the sallif-Acm Is obtained. Also
considered is the case of the presence of a perfectly-reflecting boundary
on the waveguide axis.
Card 1/1

AUTHOR: Gazaryan, Yu.L. 46-2-5/23 z"
TIIZZ: Waveguide sound propag4ion in one class of inhomogeneNsly
stratified media. (Volnovodnoye rasp rostraneniyezvukEL diTa
odnogo klassa sloisto-neodnorodnykh sred)
195~i
PERIODICAL: "Akasticheskiy 71hurnal" (Journal of Acoustics),
Vol. 3, No.29 pp. 127-141 (U.S.S.R.)
ABSTRACT: (Some of the results have been given in (9) Yu.L.Gaza,4.
yan: Waveguide sound propagation in inhomogeneous media. A,
Acoustical Jourml, 1956, 29 21 133-136)
In investigations of waveguide sound propagation the usual
method of linear sound velocity approximation leads to very
complicated computations and yields cumbersome results. ' t is
therefore thought to be of interest to inVeStig~.te this propa-~~
gation when the sound velocity in the medium is determined by
one analytical function only. In the present article, the
author presents results of analysis of propagation for th 'type
of medium as postulated by Epstein and as used by him in the
investigation of reflection and of propa&-tion of a p ane 1, .
electro-magaetic wave (1). In case of a sound wave,
density of the medium is constant, the Epstein medium may,~be
Card 1/5 represented in approximation as two homogeneous half -voli#es
boun(i t%ether by a transitional layer, -the sound velocilir in

46-2-5/23
Vlaveguide sound propagation in one class of inhomogeneously
stratified media. (Cont.)
which varies between two values,, corxesponding to the two half-
volumes. The sound velocity, moreover, in such a layer either
has no maxima and minima, or has one maximim or minirmim only.
For the last case, the layer would represent a waveguide depen-
dence of sound velocity a(z) on distance z from its axis
(for one of the parameters combinations as shown in Fig. 1.).
The variable parameters are: the values of c at infinities,
the minimum value of e and the layer width. It is shown that
the solution for the field of a spherical point harmonic radiator
is much aim lified for the symmetrical Epstein level when
COO) = ce-40). The integral re resentation of the point
source harmonic radiator field is iound next, first for the case
of homogeneous medium assuming that the sound propaGation
velocity depends only on the z ordinate of the cartesi=
system eq.(2). The same equation may also be represented in the
form of eq.(3). Bq, (2) has been obtained by the separation of
variables method in cylindrical co-ordinates, where the expon-
entials under the integrands are solutions of e ' (4). These
have been so chosen that, when multiplied IV U x) , they
Card 2/5represent incident plane waves. This corresponi to the physical
cowept of a spherical waveg for z >,;Pzo 9 represented by the

46-2-5/23
Waveguide sound propagation in one class of inhomogeneously
stratified media. (Cont.)
superimposition of a travelling up homogeneous incident waves
and of a travelling dovm inhomogeneous decaying waves, the
sequence being reversed for z