SUMMARIES
PROFESSOR RASIM
ALIZADE - ONE AN OUTSTANDING
SCIENTIST IN THE
FIELD OF MECHANISM
AND MACHINES SCIENCE.
“Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 5-6, (Engl.).
research of automatic manipulator created on the
basis of spherical four-bar slider-crank mechanism.
N. Davitashvili. “Problems of Mechanics”. Tbilisi, 2012, ¹
1(46), pp. 7-14, (Engl.).
Is
stated description, principle of operation and kinematical research of
automatic manipulator that is created by spherical four-bar slider-crank
mechanism. The automatic manipulator represents spherical six-bar mechanism,
the kinematical parameters of that are defined by analytical methods. Obtained
results give the possibility to solve the tasks of kinematical synthesis and
dynamics of spherical automatic manipulator. 3
ill. Bibl. 10. Engl.; sum. in Russian.
KINEMATIC
SYNHTHESIS OF FUNCTION GENERATING SPATIAL RTSR MECHANISM BY CHEBYSHEV
APPROXIMATION. Duygu
Çömen, İlkay Erkılınçoğlu, Mehmet
İsmet Can Dede. “Problems of Mechanics”. Tbilisi,
2012, ¹ 1(46), pp. 15-20, (Engl.).
In this
study, RTSR mechanism is chosen to generate an output function by using the
technique of Chebyshev approximation. Equal spacing helps to determine the
precision points in the mechanism. The error value is added to the objective
function and considered as a parameter during the calculation. The new
precision points are obtained from the roots by taking the derivative of the
objective function. The recursive process is carried out until the absolute
error values are stabilized within the preset tolerances. Results are given in
tables and graphs. 3 ill. Bibl. 13. Engl.; sum.
in Russian.
Carnot's theory as a special case and the violation of
the second law of thermodynamics due circulation of heat in one-dimensional
supersonic flow of heat-conducting gas.
A. Aptsiauri. “Problems of Mechanics”. Tbilisi, 2012, ¹
1(46), pp. 21-34, (Engl.).
In
the article is shown that the compression shock in supersonic flow is
characterized by properties that at increasing of the thermal conductivity of
gas, or at decreasing the Prandtl number
(
) leads to a violation of the second law of
thermodynamics that is expressed in the creation of possibility of generating
energy from the heat of the equilibrium environment. It is shown that the
Carnot cycle is valid only for those cycles in that are applied equilibrium in
space actuating medium. 12 ill. Bibl. 8.
Engl.; sum. in Russian.
RESULTS OF diesel engine research With FUEL
preliminary treatment.
O. Klyus. “Problems of Mechanics”. Tbilisi, 2012, ¹
1(46), pp. 35-38, (Engl.).
In
the article presents results of preliminary tests of diesel engine fuel system
at application of catalyst and turbulizing fuel treatment in the nozzle. This
treatment is carried out directly in the sprayer body before fuel injection
into the combustion chamber. Tests were conducted in a laboratory setup,
allowing recording the development fuel jet, as well as in the single-cylinder
NVD-24 type diesel engine compartment 4 ill.
Bibl. 2. Engl.; sum. in Russian.
modes
of vehicles traffic condition and fuel effectiveness.
O. Gelashvili, P. Bezhanishvili. “Problems of Mechanics”. Tbilisi, 2012, ¹
1(46), pp. 39-43, (Engl.).
The problem of rational use and economy of
fuel-energy resources is especially important for motor road transport that
belongs to one of the basic consumers of liquid petroleum fuel. One of the main
trends in reduction of fuel operational is presented y perfection of the fuel
management system. Management task consists in to provide, grounded on the
scientific - technical progress, for vehicle movement real in conditions, the
optimal value of fuel operational costs.
The stated in the article energy investigation of
vehicle traffic modes stipulates on the basis of application of fuel rating,
account and control scientifically grounded actions development operational
costs of the fuel management system that provides rolling stock application
and drivers training quality improvement. 1 ill.
Bibl. 5 Engl.; sum. in Russian.
A ROD MODEL OF ELECTRICAL
MACHINES:
CONCEPT AND BASIC EQUATIONS. A.
Tvalchrelidze. “Problems of Mechanics”, Tbilisi, 2012, ¹ 1(46), pp. 44-48,
(Engl.).
For describing the electromechanical conversion of
energy in the electrical machines there is proposed in a given article to
examine the interactions of electro-conductive rods located along the axis of
the machine. There are obtained the fundamental relationships for the case of
direct currents. In the follow-up articles there will be examined the
alternating currents and cores’ magnetization phenomena. 3 ill. Bibl. 2
Engl.; sum. in Russian.
stability of front wheel of automated additional load
system of TANDEM-wheeled self-propelled chassis. R. Makharoblidze, I. Lagvilava, O. Asatiani, A. Kobakhidze. “Problems of Mechanics”. Tbilisi, 2012, ¹
1(46), pp. 49-54, (Engl.).
The possible functional design of front
wheel of automated additional load system of tandem-wheeled self-propelled
chassis is offered. The mathematical model of automated system functioning is
composed. From conditions of stability and rate of transient process damping
are generated relations for calculation of geometrical, kinematical and
dynamical parameters of system. 1 ill. Bibl. 3. Engl.; sum. in Russian.
MATEMATICAL MODEL
AND EXPERIMENTAL RECEARCHES OF
THE TECHNOLOGICAL PROCESSES OF COVERING OF THE
WALL SURFACES WITH THE HALP OF WIBRATIONS. M. Chelidze, V. Zviadauri, M. Tedoshvili,
G. Tumanishvili. “Problems
of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 55-59, (Engl.).
The Summary: In the work theoretically and practically are shown particularities of
compactions and covering of fluid plastic concrete mixture on wall surfaces.
There are brought mathematical models, describing technological processes and
protection îðåðàòîðà from influence of the vibrations. The
Problem of provision of covering
monolith on walls are solved by means of two-stage fixing of cover layer. For the reason of
reductions of vacuum tractive power, at flybacks of the vibrator, between
surfaces of working and fluid concrete
is aplied cellophane film. 12 ill. Bibl. 4. Engl.;
sum. in Russian.
ON ONE APPLICATION OF THE CHARACTERISTIC
METHOD. R. Bitsadze, S. Bitsadze. “Problems
of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 60-66, (Engl.).
The paper proposes a nonlinear analogue
of the characteristic Goursat problem is proposed for a nonlinear oscillation
equation, which makes it possible to simultaneously define a regular solution
and its extension domain. For this purposes the classical characteristic method
is used. Bibl. 2. Engl. Sum. In Russian.
NON-STATIONARY FLOW OF A
NONLINEAR-VISCOUS-HARDENING MATERIAL IN
THE PIPE. O. Kikvidze, S. Zakenov. “Problems
of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 67-71, (Engl.).
The non-stationary laminar flow of a
viscous-plastic material in a pipe on the basis of the creep theory is
considered. The nonlinear differential equations are solved numerically by
method of straight lines in a combination to a method of continuation of the
decision on parameter. Results of research are necessary for pipeline
calculation at transportation of viscous materials, oil and oil products. 2 ill. Bibl. 3. Engl.; sum. in
Russian.
analysis of spherical two-layer shells with
constant thickness layers by method of initial parameters. J. Bichiashvili, Z. Bichiashvili, M.
Moistsrapishvili, G. Bichiashvili. “Problems of Mechanics”. Tbilisi, 2012,
¹ 1(46), pp. 72-78, (Engl.).
In the
article is carried out analysis
of a free, spherical two-layer (both layers are made from same but differently oriented materia,), orthotropic shell with constant thickness layers, the both
layers thickness of are similar. The shell represents a hemisphere with a central hole, characterized by an angle
α0 = 30 °. The outer edge of the shell is rigidly supported. On the shell is applied vertical axisymmetric load p=1 N/cm, distributed on the
intersection circumference of the median surface of the shell with a central hole. The radius of median surface meridian of
the shell makes up to R=200 cm and the thickness of each layer makes
up to δ = 40
cm. The total
thickness of the shell
makes up to 40% of its average radius. As design surface is accepted median surface of the shell. The
meridian of design surface of
the shell is divided on the number of sites
k=500. The computer calculation
program provides a solution to the
more general problem than that considered
in this paper.
4 ill. Bibl. 3. Engl.; sum. in Russian.
Deterioration of rails and wheels on pass spans Georgian railway at trains curvilineat movement.
A. Sharvashidze, d. Chitadze. “Problems
of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 79-81, (Engl.).
The
most non-desired kind of train’s movement that is related to the movement of
eight-axle rail-cars curvilinear movement on small radius pass spans of Georgia
main railway is considered. These spans from the point of view of intensity of
deterioration are characterized by negative indices that reduce the service
life of rails heads and wheels flanges, which are often remove from the
operation much earlier than their expiration term. In addition the curvilinear
spans restricts the movement speed thus with other important actions is
advisable to maximal reduce multiaxis transport means movement and fully will
be used there only four-axle rail-cars. Due studies is defined that is
advisable instead of two contact touch of wheels with rails to apply one
contact touch that promotes to reduce the deterioration between contact
surfaces. The stated proves on Georgia main railway importance of elimination
of small radius non-standard curves that gives the possibility to increase at
those spans train traffic speeds. 1 ill. Bibl. 7. Engl.; sum.
in Russian.
improvement of producing capacity of CAr-repair
facility’s carriage’s assembly workshop by flow-line conveyor method of freight
railcars repair.
A. Sharvashidze, m. Paturashvili,
Z. Paturashvili. “Problems of Mechanics”. Tbilisi, 2012, ¹
1(46), pp. 82-86, (Engl.).
The
optimal and rational layout of carriages location on the flow-line - conveyor lines of
carriages assembly workshop of car
repair facility is considered.
In such a scheme would be minimal loss of time while
moving carriages from one position to another. At increasing of
mechanization and automation level also improves capacity of carriage assembly workshop. Is
received the maximum stabilization of in-cycle synchronization between repair positions. In facilities each flow-line - conveyor lines are specialized for the repair of one type of freight carriages. It is economically feasible and acceptable to those countries where a small fleet of freight carriages is. 1 ill. Bibl. 4. Engl.; sum. in Russian.
Academician
Robert Adamia “Problems
of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 87-88, (Engl.).