**¹****2(51),
2013**

**SUMMARIES**

MODELING OF RADIATIVE-CONVECTIVE HEAT TRANSFER IN
THE DIESEL ENGINE.** T. Natriashvili, R. Kavtaradze, Z. Kavtaradze, A. Zelentsov _{, } D. Onishchenko_{. } **“Problems of Mechanics”. Tbilisi,
2013, ¹ 2(51),
pp. 6-12 (Engl.).

** **The turbulent boundary
layer is investigated on the combustor surface of arbitrary curvature subjected
to the flow of a working medium which radiates and absorbs thermal energy. New
integral relations of boundary layer are used for solving equations of complex
heat transfer. The authors investigated the turbulent Prandtl number in the
case of combined radioactive and convective heat transfer. The calculated
values of local heat flux on the combustor surface are in good agreement with
the experimental data obtained in a high-speed diesel engine under conditions
of bench tests. 3 ill. Bibl. 12. Engl.; sum. In Russian.

FUNCTIONAL PROPERTIES OF STEPLESS GEAR ADAPTIVE
TRANSMISSIONS.

**K. Ivanov, S. Joldasbekov, A.
Jomartov, Y. Temirbekov****. ****“**Problems of
Mechanics”. Tbilisi, 2013, ¹ 2(51 ), pp. 13-20 (Engl.).

The
gear adaptive progressive transmission can be created in the form of the
kinematic chain with two degrees of freedom having the mobile closed contour
with toothed wheels. The closed contour imposes a constraint on motion of links
and transforms the kinematic chain into the mechanism with one input. Such
mechanism gets property of automatic adaptation to variable technological
loading. Regularity of interconnection of power and kinematic parameters is
resulted. The animation model and a design of gear adaptive transfer are
presented. 4 ill. Bibl. 7. Engl.; sum. in Russian.

FUNCTIONAL PROPERTIES OF STEPLESS GEAR ADAPTIVE
TRANSMISSIONS.

**Y. Temirbekov, S. Joldasbekov, A.
Jomartov****. ****“**Problems of
Mechanics”. Tbilisi, 2013, ¹ 2(51), pp. 21-27 (Engl.).

The
gear adaptive progressive transmission can be created in the form of the
kinematic chain with two degrees of freedom having the mobile closed contour
with toothed wheels. The closed contour imposes a constraint on motion of links
and transforms the kinematic chain into the mechanism with one input. Such
mechanism gets property of automatic adaptation to variable technological
loading. Regularity of interconnection of power and kinematic parameters is
resulted. The animation model and a design of gear adaptive transfer are
presented. 3 ill. Bibl. 3. Engl.; sum. in Russian.

FUNCTION
GENERATION SYNTHESIS OF PLANAR 5R MECHANISM.** Gokhan Kiper, Tunc Bilgincan,
Mehmet Ismet Can Dede. ****“**Problems of
Mechanics”. Tbilisi, 2013, ¹ 2(51), pp. 28-31 (Engl.).

This paper deals with
the function generation problem for a planar five-bar mechanism. The inputs to
the mechanism are selected as one of the fixed joints and the mid-joint,
whereas the remaining fixed joint represents the output. Synthesis problem of
the five-bar mechanism is analytically formulated and an objective function is
expressed in polynomial form. Function generation synthesis is performed with
equal spacing and Chebyshev approximation method. The four unknown construction
parameters and the error are evaluated by means of five design points and the
coefficients of the objective function are determined by numerical iteration
using four stationary and one moving design point. Stationary points are placed
at the boundaries of the motion and the moving point is re-selected at each
iteration as the point corresponding to the extremum error. Iterations are
repeated until the values are stabilized. The stabilization usually occurs at
the third iteration. By this method, the maximum error values are approximately
equated, hence the total error is bounded at certain limits. Finally the
construction parameters of the mechanism are determined. 6 ill. Bibl. 5, Engl.,
sum. in Russian.

ACQUIRED VARIABLE DESAXIAL IN MECHANICAL SYSTEMS
WITH COUPLER-PISTON GROUPS AND INCREASED CLEARANCES.** G. Sharashenidze, T.
Dundua,
G. Usanetashvili. “**Problems of
Mechanics”. Tbilisi, 2013, ¹ 2(51), pp. 32-41, (Engl.).

A
phenomenon of a variable desaxial in plane mechanisms with connecting
rod-piston groups and clearances in hinged junctions is studied in the work.
Conditions of generation and variation of an acquired variable desaxial in the
course of the mechanism operation at instantaneous displacement of the piston along
the line of instantaneous action are elaborated. A value of the variable
desaxial and limits of its expansion are established. Corresponding analytical
expressions considering clearances and variable generalized coordinates are
obtained. Accomplished analysis of the variable desaxial can be used in the
course of research of mechanisms of any complexity having connecting rod-piston
groups and clearances.* *4 ill. Bibl. 13. Engl.;
sum. in Russian.

THE ANALYSIS
OF AN AFTER-EFFECT OF IMPACT IN
TRANSMISSION AT SLEEVE
CAPTURE BY ROLLS
OF THE AUTOMATIC MILL.**
S. Mebonia, D. Demetradze, P.
Mshvildadze, A. Gagnidze. **“Problems
of Mechanics”. Tbilisi, 2013, ¹ 2(51), pp. 42-46 (Engl.).

In article the problem of transformation of the
impact impulse arising in the automatic mill deformation centre in the mill
transmission is considered at secondary capture of metal by rolls. The formulae
for calculation of the angle of twisting of the intermediate shaft of the
automatic mill transmission and the coefficient of dynamism are obtained. 4 ill. Bibl. 6. Engl.; sum. In Russian.

GENERATION of usable ENERGY
BY alternation OF INTERNAL ACCUMULATION AND ENERGY RELEASE PROCESSES AND WATER
AS STRANGE Fuel.** A. Aptsiauri. “**Problems of
Mechanics”. Tbilisi, 2013, ¹ 2(51), pp. 47-56, (Engl.).

In
the article is shown that if in the thermodynamic cycle, at a specific
temperature, I carried out the heat-insulated process with heat absorption, and
the reverse process with heat release occurs at a higher temperature, the
thermodynamic cycle would continuously generate usable energy from the heat. As
an example is stated the water decay and reverse synthesis cycle and was shown
that the water thus becomes in a source of heat and mechanical energy,
although, in reality, at this is consumed the environmental heat or another
kind of energy (in particular, vacuum energy).* *4 ill. Bibl. 7. Engl.; sum. in Russian.

LOW CYCLE FATIGUE OF DEFORMABLE AUSTEMPERED DUCTILE IRON (DADI).**
**

¹ 2(51), pp. 57-63, (Engl.).

Complex investigation on the effect of combination of high-temperature thermo
-mechanical (HTTM) treatment ( hot rolling, pressing, extrusion and forging)
and multistep austempering processes on the low cycle fatigue (LCF) behavior of
deformable austempered ductile iron (DADI) was carried out by the methods of
LCF testing, SEM, TEM and X-ray diffraction analyses. For experiments there were cast two compositions of DADI:
first – high-silicon (2.2 % Si), low-alloyed by molybdenum and cooper; second –
with low-silicon (0.5 - 1% Si) containing aluminum (1.5 - 2% Al) .The optimum
combination of high strength and good LCF properties of DADI is caused by the
ultrafine dispersion of the microstructure and the variable content of retained
austenite. 5 ill. Bibl. 9. Engl.; sum. in Russian.

A ROD MODEL OF ELECTRIC
MACHINES: ELECTRIC INTERACTION OF RODS WITH ACCOUNT FOR “DELAYED” DISTANCE.** A. Tvalchrelidze, K. Tskhakaia,**
“Problems of Mechanics”. Tbilisi. 2013, ¹ 2(51), pp. 64-68 (Engl.).

For describing the
electromechanical energy conversion in the electrical machines there is
proposed in a given article to examine the interactions of
electricity-conductive rods located along and transverse to the axis of the
machine. Within the framework of a rod model there were considered previously
the magnetization phenomena of cores. The given paper dwells on the basic
relations of electric interactions of rods with account for “delayed” distance.
3 ill. Bibl. 4. Engl.; sum. in Russian.

analysis of damping
coefficients of three-layered symmetrical structure plates.**
J. Kakhidze, M. Vazagashvili. “**Problems of Mechanics”. Tbilisi, 2013, ¹ 2 (51), pp.
69-72, (Engl.).

In
the article is carried out the multi-parametrical analysis of influence of
geometrical parameters and rheological properties of materials of structure’s
components on damping coefficients. The revealed earlier for simple mechanical
systems synergy effect of dissipative properties for structurally non-uniform
prismatic structures is proved.* *5
ill. Bibl. 5. Engl.; sum. in Russian.

providing of train traffic safety on having
mountaneous conditions railway by running order of rolling stock brake system.**
A. Sharvashidze, A. Kakabadze, B.
Didebashvili. “**Problems
of Mechanics”. Tbilisi, 2013, ¹ 2(51), pp. 73-76, (Engl.).

In
the article are considered issues of freight trains traffic safety in
mountainous conditions of railways, quite a number of stages are characterized
by small radius curves and large slope. At their passing heavy-tonnage freight
trains require special traffic safety measures as well as the providing by
brake devices. Due researches is defined the necessity of providing freight
train safety by electric regenerative brake.* *1 ill. Bibl. 5. Engl.; sum. in Russian.

ROAD TRAFFIC ACCIDENT RATE IN ARMENIA AND IN SOME
COUNTrIES around the WORLD. **Y. Vardanyan, C. Burnusuzyan, V.
Harutyunyan. “**Problems of Mechanics”. Tbilisi, 2013, ¹ 2(51), pp. 77-82
(Engl.).

In this paper is carried out an analysis of road
traffic accidents statistical data, collisions and fatalities occurred in the
period from 2000 to 2010 in Armenia and some foreign states. This analysis
shows that in high-income countries the number of fatalities due to road
accidents is decreasing up to 50%, meantime in Armenia it has increased by 34%.
Totally in low-income and middle-income countries more people are died due to
road traffic accidents than in high-level countries.

In
addition to accident rate absolute indices have also been analyzed relative
indices (fatalities per 100,000 inhabitants, the number of vehicles per 1000
inhabitants, fatalities per 100 road traffic accidents), as well as predicted
grow of fatalities on road accidents. Bibl. 6. Engl.;
sum. in Russian.

COMPOSITES
BASED ON EPOXY RESIN AND GROUND FROM THE PLANET MARS.** J. Aneli, O. Mukbaniani, L. Shamanauri. “**Problems of Mechanics”.
Tbilisi, 2013, ¹ 2 (51), pp. 83-89, (Engl).

Strengthening, softening
temperature, and water absorption of the polymer composites based on dian epoxy
resin (type ED-20) and unmodified and modified by tetraethoxysilane the ground from the
planet Mars are studied. Comparison of
experimental results obtained for investigated composites shows that ones
containing modified filler have more high values of mentioned above parameters
than composites with unmodified one at definite loading. The obtained results
are described in terms of structural peculiarities of composite materials. 6
ill. Bibl. 6. Engl.; sum. in Russian.

research of transport process parameters in orfer of
increasing of container traffic effectiveness. **N. Butkhuzi. “**Problems of
Mechanics”. Tbilisi, 2013, ¹ 2 (51), pp. 90-93, (Engl).

In this paper is considered the methods to improve
the efficiency of container transport and are investigated the transport
process parameters. During the analysis of container flow values was found that
there is a tendency to increase the volume of container traffic. The process of
containerization has initiated the development of transportation systems by
using of terminals. The application of terminal technology, combined with the
principles of logistics gives the possibility to increase the efficiency of
transport operations, to provide high quality of service and reduce the time of
cargo delivery. With consideration of the application of logistics principles
are determined the optimal number of technical and technological parameters
characterizing the operational and financial reliability of container traffic. 2 ill. Bibl. 7. Engl.; sum. in Russian.

some plasto-elastic
problems.** A. Buksianidze. “**Problems of
Mechanics”. Tbilisi, 2013, ¹ 2 (51), pp. 94-98, (Engl.).

In
the article fully is studies case of constant thickness layer. In this case
according integro-simultaneous equation of Prandtl by expansion method of
Chebishev polynomials would be reduced to infinite system of algebraic
equations that would be solved on computer by truncation method.* *Bibl. 5. Engl.; sum. in Russian.