**¹ 1(34), 2009**

**SUMMARIES**

structural analysis and design of manipulators on basis of planar FIVE-BAR mechanisms with two degrees of freedom.** N. Davitashvili. “**Problems of Mechanics”.

The
structural analysis of manipulators is given on the basis of planar five-bar
mechanism with two degrees of freedom and is fined out the twenty one various
types of planar manipulators. For one type of the planar manipulator is found
the working volume of work range and is carried out it’s design by the given
law of motion of gripper. Application in manipulators of the planar closed
kinematic chains enables for creation of precision robots. 8 ill. Bibl. 13. Engl.; sum. in Russ.

Calculation and test of the welded bogie solebar and the
bogie bolster of the freight car.** ****G. Tumanishvili, M. Chelidze, V.
Zviadauri, L. Kavtaradze. “**Problems of Mechanics”.

Technological features of
manufacturing of large-sized details and achievements in the field of welding
allow us to use effectively welding in manufacture of large-sized elements of
freight bogies. The Work is devoted to theoretical and experimental research of
durability of welded structure of the bogie solebar and bogie bolster developed
and fabricated in joint-stock company “Elmavalmshenebeli”. On
the basis of research indispensable correctives in the design
of said elements are
made and the recommendation for further investigations in operational
conditions is given. 13 ill. Bibl. 5. Engl.; sum in Russ.

ON THE UNSTEADY MOTION OF
A VISCOUS HYDROMAGNETIC FLUID CONTAINED BETWEEN
ROTATING COAXIAL CYLINDERS OF FINITE LENGTH. **V. Tsutskiridze, L. Jikidze. “**Problems of Mechanics”.

The problem of unsteady rotational motion of electrically conducting
viscous incompressible fluid, contained within two asxially concentric
cylinders of finite length in the presence of an axial symmetric magnetic field
of constant strength, has been solved exactly using finite Hankel transform in
combination with a technique presented in this paper. This paper presents a
complete of the problem under consideration, which has been of interest for
many years; moreover the Pneuman-Lykoudis solution in Magnetohydrodynamics and
Childyat solution in hydrodynamics appears as a special case of this study. The analysis shows that the
disturbance in the fluid. Bibl. 10. Engl.; sum. in Russ.

THE fuel treatment turbulizatinG in INJECTORS
OF DIESEL engines**. ****Oleh
Klyus. “**Problems of Mechanics”.

In the paper was presented possibility to increase the effectiveness
parameters of diesel engine performance as well as to decrease the emission of
toxic compounds in exhaust gases by using preliminary catalytic fuel treatment
with utilize the phenomenon of turbulization in injector passages. First
results of tests on an engine of 359 type have shown an improvement of
operational parameters and a decrease of toxic emission in exhaust gases. 4
ill. Bibl. 5. Engl.; sum. in Russ.

SIMPLIFICATION OF CALCULATIONS CONCERNING THE FLOW OF
CHARGING AIR FOR HIGH POWER SLOW SPEED ENGINE BASED ON MODEL TESTS. **T.
Tuński. “**Problems of Mechanics”.

The following paper deals with the results of model tests of both the
amount of exhaust gases and the fuel consumption of marine slow speed engines.
The calculations have been carried out for rated conditions as well as for
partial loads within the range of operating loads of marine engines. On the
basis of the achieved results there has been made an analysis of possible
simplification of the calculating procedure concerning the amount of air
required for the combustion process. 1 ill. Bibl. 5. Engl.; sum. in. Russ.

METHOD OF MATHEMATICAL MODELS OF PLANNING AND CARRYING
OUT OF TWO-FACTOR EXPERIMENTS.

**I.
Gorjoladze, N. Gorjoladze, G. Rurua**. “Problems of Mechanics”,

Method of
planning and carrying out of two-factor experiment is established, which is
based on determination of the rank of required value, given by the table. Rank
determination provides existence of mathematical model and setting formula of
analytical form for required dependence, which very often significantly reduces
the quantity of experiments. Models of forms of one-variable functions product,
sum and power are considered. Bibl. 6, Engl.; sum. in Russ.

EXPLORATION OF PNEUMATIC SPRING SYSTEMS SUSPENSIONS IN TRANSPORT CAR. **Z. Bogvelishvili, M. Glonti, V.
Bogvelishvili.** “Problems of Mechanics”,

Mathematicat model has been elaborated to
explorate pneumatic equalizing spring suspension dynamics, which represents
system of differential equation and describes current processes of thermodynamical,
thermal and mass transmission in research pneumatic systems*.* 1 ill. Bibl. 3. Engl.; sum. in Russ.

DEVELOPMENT
OF LOGISTICAL SYSTEM OF freight traffic
ON TRANSPORT. **O. Gelashvili,
L.Botsvadze, I. Chkhetia, N. Butkhuzi. **“Problems
of Mechanics”,

In article
are considered the questions of introduction of modern technologies in process
of transportation and first of all the questions of wide application into
practice the terminal technologies of freight traffic which are based on
logistical principles. Priority existence of logistical intermediaries
(subjects) which possess skill to play a main role in perfection of the
organization of transportations will be considered. Territorial associations of
the independent companies and the organizations which carry out the
accompanying service necessary for ãðóçîïåðåâîçîê and which refer to
as “the logistical centers” are rather important. All the above have for an
object to develop logistical system of commodity movement which will provide
reliable moving cargoes and their safety at the minimal expenses. Bibl. 3. Engl.; sum. in Russ.

ON THE PROBLEM OF MATHEMATICAL MODELING OF THE DYNAMICS OF ELECTRIC
LOCOMOTIVE AT MOTION ON CURVED SECTIONS OF RAILWAY TRACK. **G. Chkhaidze, A. Chkhaidze, T. Mchedlishvili. ^{ }**“Problems
of Mechanics”,

The problems are examined connected with mathematical modeling of the
dynamics of the system electric locomotive – railway track with consideration
of dynamic phenomena in the circuits of traction drive. Mathematical
expressions of kinetic and potential energy for investigation of the system at
electric locomotive motion on curved section of railway track. 3 ill. Bibl. 5.
Engl.; sum. in. Russ.

Peculiarities of carbon nano-structures and
some aspects of their synthesis. **E. Semiletova, N. Bakradze, R. Kasumov, K. Khatoyan.
“**Problems of Mechanics”.

In the
article are considered separate aspects of peculiarities of nano-structures of
carbon materials and nano-technologies. The results of our experimental
investigations, possibilities of synthesis and peculiarities of formation of
carbon nano-crystals from gas environment in conditions of smoldering discharge
are shown. Also are shown some already real fields of application of
nano-materials. 7 ill. Bibl. 20. Engl.; sum. in Russ.

regulation of free
oscillation period in joint spatial structures.

**Yu. melashvili, l. balanchivadze,
l. zambakhidze, i. bakuradze.**

In the article is considered the
cases of free oscillation period
regulation of joint spatial structures, cylindrical, hip-roofed, folded, jib
shell and reinforced by cable system thin-walled plate and are given the their
numerical calculation. For problem solution are used the Bubnov-Galerkin
method; are written down the various
fundamental equations of joint spatial structures calculation on dynamic
force and boundary conditions of their solution*.*. 4 ill. Bibl. 4. Engl.; sum. in Russ.

axisymmetric oscillations of cylinders from material with various
parameters of nucleus of shear and volumetric relaxation. **M. Vazagashvili, B. Churchelauri, G.
Metreveli, R. Gogaladze. ****“**Problems
of Mechanics”.

In work are
resulted the received solutions of problem of characteristic axisymmetric
oscillations of continuous viscoelastic cylinders with free borders. Two
variants of the material behavior are considered. In the first was considered,
that viscoelastic properties appear only at shear, and on compression the
material works as elastic. 6 ill. Bibl. 5 Engl.; sum.
in Russ.

Experimental
research of fiber-optical system of concrete constructions monitoring.** ****T. Nareklishvili, M. Tsikarishvili, L. Zambakhidze T.
Magradze, A. Tsakadze, D.
Kupatadze. “**Problems of
Mechanics”.

The level of industrial development of
leading countries is determined with industry
volume and assortment of output production and quality factor, as well.
Especially important is the control of
quality factor of concrete constructions as to avoid constructions failure and
emergency situations. 10 ill. Bibl. 8.
Engl., sum. in Russ.

Harmonious bending oscillations of structural - non-uniform rod system.** ****M. Vazagashvili, B. Churchelauri, G.
Metreveli, R. Gogaladze. ****“**Problems of
Mechanics”.

In
the work are investigated the bending harmonious oscillations of the structures
consisting from several in parallel or coaxially located variable cross-section
rods.
Interest to bending oscillations is caused first of all by that for
automatic guns on grouping of shots and its accuracy essentially affect the amplitude
and the phase bending oscillations of the barrel at the moment of the shell
start. 1 ill. Bibl. 5. Engl.; sum. in Russ.

Increase of efficiency of the city bus by a method of the multifactorial
analysis. **D.
Pridonashvili. “**Problems of
Mechanics”.

In work is
developed the technique of increase in of the city bus efficiency by
improvement of traction -speed performance and fuel efficiency that is carried
out by selection of design data with application of the multiple-factor
analysis. 1 ill. Bibl. 3. Engl.; sum. in Russ.

Determination of the resonant frequencies of
super universal milling machines on the basis of analysis of free vibrations
using finite element method.** K. Tskhakaia. ****“**Problems of
Mechanics”.

The frequency
range of the forced vibrations has been determined on the example of the super universal milling machine. The values
of frequencies of free vibrations have been found on the basis of analysis of the
finite element model of machine. The values of the frequencies potentially
dangerous in the view of occurrence of the resonance have been revealed**. **3
ill. Bibl. 7. Engl.; sum. In Russ.

some directions of Contact problems researched in multilayered mediums. **N. Mardaleishvili.** **“**Problems of Mechanics”. Tbilisi, 2009, ¹ 1(34), pp. 102-105,
(Engl.).

In work are
presented the results of short review of contact problems. It is received at
research interaction of isotropic, anisotropic and non-uniform materials. The
principal attention was given to those mainstreams, which were allocated at
research of contact problems for above specified materials and structural
components. Bibl. 24. Engl.; sum. in Russ.

FORMULAS OF DETERMINATION OF ANALYTICAL FORM OF TWO RANK FUNCTION OF
FOUR VARIABLES, GIVEN BY THE TABLE. **I.
Gorjoladze, N. Gorjoladze**,”Problems of
Mechanics”, 2009, ¹ 1(34), pp. 106-112, (Engl.).

Mathematical model of two rank function of four variables, given by
table is considered in this article. This model does not contain a power of
one-variable functions of arguments. His checking criteria, and corresponding
formulas of setting of analytical form of the function are formulated. Bibl. 9. Engl., sum. in Russ.