SCIENTIFIC ABSTRACT TURBOVICH, I.T. - TURCEK, F.

• Document Type: CREST
• Collection: Scientific Abstracts
• Document Number (FOIA) /ESDN (CREST): CIA-RDP86-00513R001757510019-5
• Release Decision: RIF
• Original Classification: S
• Document Page Count: 100
• Document Creation Date: November 2, 2016
• Document Release Date: March 14, 2001
• Sequence Number: 19
• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

SOV/106-59-6-10/14
Measurement of the Parameters of Non-Iinear Elements
and solve for LK and K , but in practice this met-hod
is difficult and inexact~ mainly because the large
saturation fluxes 14 and ',4f2 have only slightly
different values. Ihe proposed method avoids these
difficulties. The basic theory of the method Is as
followso, the fianction
Y = I sj,RKY~ 1 (4-)
is Fourier analysed and the 'values of the constant
component ao/2 and of t.;Le second harmonic a- are
found frem tables (Ref '+). Then the reciprocal value
1/K of the rLon.-Iinearity index is found. from the fol-mula
2a-
The block diagram of a circuit which will perform these
operations is shown in Fig I. A sinusoidal -urren 4-
sufficient to cause satAration7 is passed through 4.-.hle
non-linea-. winding LK . The se.-,r,,ndary voltage Is appl-jed
to an integrator, 3, at thG output of which is obtained a
%.,ard 2/1+
voltage proportional to the integ7.~al of the input voltage,
i.e. to the flux linkages i4r where

SOV/106-59-6-lo/iL~
Measurement of the Parameters of Non-Linear Elements
Nr = LKiK = LKIK sinK Wt.
m
This voltage is applied to a double half-wave rectifier,
4, at the output of which a voltage proportional to
IsinKot-I
is obtained. To obtain the ratio of the
constant component to the second harmonic, the value of
the rectified voltage is changed by a potentiometers 5,
until the amplitude of the second harmonic equals unity.
A. filter, 6, tuned to the second harmonic and a voltmeter)
7, are used for this purpose. When a2 = 1, the value
of the constant voltage measured on the voltmeter, 8,
is numerically equal to the modulus of the ratio of the
constant component to the second harmonic Iao/2a2I -
The voltmeter scale is calibrated to conform to Eq (5)
giving K direct. To find LK, some particular
amplitude of current Im = N amps is set in the primary
circuit (measured on Ammeter, 10), then
L = Vmax V mg-g - (6)
K IK NK
Card 3/1+ max

sov/lo6_59-6-lo/iL~
Measurement of the Parameters of Non-Linear Elements
Potentiometer, .11, has a number of scales equal to the
number of selected values of Im. The scales are
directly calibrated in values of the non-linearity
index K , so that the transfer coefficient of the
Potentiometer eq:aals l/NK. The Potentiometer slider
is placed at the measured value of K on the scale
corresponding to the Current strength. Then the
Card voltmeter, 12, reads the value of LK.
4/4 V.P. Savellyev and G.V. Rodionov participa-ted in the
development of a laboratory model.
There are 1 figure and 4 Soviet references.
SUBMITTED: January 26, 1959

P-8 0 0 0
AUTHOR:
TITLE:
PERIODICAL:
ABSTRACT:
Card 116
Turbovich, I. T.
77178
sov/io8-15-1-4/13
Influence of Frequency- and Amplitude-Modulated
-Oscillations on Linear Syotems
Radiote1chnika, 1960, Vol 15, Nr 1, PP 30-34 (USSR)
The problem of influence of a nonmodulated harmonic
oscillation on a linear system is solved in an
elementary manner by'defining the output oscillation
as a product of the input oscillation by a static
transmission coefficient, depending only on the
frequency of the impulse voltage.. In case of non-
harmonic oscillations, when frequency and amplitude
vary with the time, the spectrum method or the method
of Duhamel integral must be used. These methods
are rather complex. The paper suggests a method
using a dynamic transmission coefficient which Tray
be applied in case of quasi-harmonic input oscJ.Ila-
tions, i.e., when the frequency and amplitude vary

.uence of Frequency- and Amplitude- 77178
elated Oscillations on Linear Systems sov/lo8-l5-1--`/l3
t
Card 2/6
relatively slowly. Similarly to the static trans-
mission coefficient K, the dynamic transmission
coefficient K is the ratio of the output voltaZe
U2 to the inp8t voltage U U 1 is givenuin the
cort~plex form: U, (1) A (f) el -f (t) A(t) e1).` (1) r"4,- t > 0
U, (1)0 40rto. The expression for U,

SOV/108-15-1-4/i--
AUTHOR: Turbovich, I. T.
TITLE: Influence of Frequency- and Amplitude-Modulated
Oscillations on Linear Sy3tems
PERIODICAL: Radiotekhnika, 1960, Vol 15, Nr 1, PP 30-34 (ussR)
ABSTRACT: The problem of influence of a nonmodulated harmonic
oscillation on a linear system is solved in an
elementary manner by',defining the output oscillation
as a product of the input oscillation by a static
transmission coefficient, depending only on the
frequency of the impulse voltage.. In case of non-
harmonic oscillations, when frequency and amplitude
vary with the time, the spectrum method or the method
of Duhamel integral must be used. These methods
are rather complex. The paper suggests a method
using a dynamic transmission coefficient which may
be applied in case of quasi-harmonic input oscilla-
tions, i.e., when the frequency and amplitude vary
Card 116

uence of Frequency- and Amplitude- 77178
-)8-"
.lated Oscillations on Linear Systems SOV/1(
Card 2/6
relatively slowly. Similarly to the static trans-
mission coefficient K, the dynamic transmission
coefficient K is the ratio of the output voltage
to the in en in the
U
2 p8t voltage U l' U1 is giv,
complex form: ~Ort>o
U, (t) = 0 ;0r1o. The expression for U 2

Influence of Frequency- and Amplitude 77178
Modulated Oscillations on Linear Systems SOV/108-15-1-4/13
is further transformed by introducing a variable
v(t,-r) which is defined as:
elw % = A (I
U1 (1) A
The function v(t, T) accounts for the variations of
A and W. When A = con3t and W = const, v(t, 7- ) =
= 1. After substituting v(t, 7-) into the equation
for U21 the following exact expression for K d is
obtained: 00
K4= !L 2)
When v(t, T) 1, the known expression for the static
comlex transmission coefficient K may be derived as:
K e- (3)
Card 3/6

Influence of Frequency- and Amplitude 77178
Modulated Oscillations on Linear 'Systems SOV/108-15-1-4/1'1-~~
A~pjying Maclaurin series expansion to funct,-Lon
A.
v ,, -r), an expression more suitable for computation
is obtained for Kd:
Plot,
The coefficient CLn is defined by Ec.- and R
is givr---n by Eq. (6), where 0