**¹****2(23)2006**

**SUMMARIES**

** **

Experimental determination of F-Δ diagram for high strength
bolts with 10.9 class of strength. **Tale B.
Geramitcioski, Ilios E. Vilos. **“Problems of Mechanics”. Tbilisi, 2006, ¹
2(23), pp. 9-16, (Engl.).

In the paper
we present the method, procedure and the developed mechanism for experimental
determination of F-Δ diagram for high strength bolts with 10.9 class of
strength, which are used in the end-plate connections of the steel structures.
F-Δ diagram is essential as input
parameter for the “SOFISTIK” software package users, for real modeling of
contact problems in the end-plate connections of the steel structures. 9 ill.
Bibl. 8. Engl.; summ. in Russ.

Structural optimization of technological processes

of manufacturing of frame parts. **T. Gegechkori, L.
Tediashvili, D. Jorjoliani.** “Problems of Mechanics”. Tbilisi, 2006, ¹ 2(23), pp. 17-22,
(Engl.).

The
methodology for structural optimization of technological processes of
manufacturing of frame parts, stages and means of its realization is formulated
in the article; a concrete example of its realization is considered. 4 ill.
Bibl. 4. Engl.; summ. in Russ.

INFLUENCE OF CRITERION OF CONTROLLING OF TURBOCHARGERS
OPERATION ON FUEL CONSUMPTION OF A VEHICLE ENGINE WITH SEQUENTIAL TURBO-CHARGING.
**Krzysztof Danilecki. **“Problems of Mechanics”.
Tbilisi, 2006, ¹ 2(23), pp. 23-26, (Engl.).

In this paper the methodology of determination of
equivalent fuel consumption on the basis of the time density characteristics
has been presented. On the basis of the presented methodology, a comparative
assessment of fuel consumption for the SW 680 engine with sequential
turbo-charging for two methods of controlling of the turbo-charging unit
operation has been carried out. 3 ill. Bibl. 4. Engl.; summ. in Russ.

MAGNETOHYDRODYNAMIC CHANNEL
FLOW UNDER TIME-DEPENDENT PRESSURE
GRADIENT. **V. Tsutskiridze. **“Problems
of Mechanics”. Tbilisi, 2006, ¹ 2(23), pp. 27-32, (Engl.).

Hartmann’s work on magnetohydrodynamic channel flow is extended to
include the case with a time-dependent pressure gradient. It is considered the
cases: 1. suddenly applied pressure
gradients which are periodic in time, and 2. pressure gradients which, with
respect to time, are step and delta
functions. The channel walls are assumed to be perfectly conductive. As
a limiting case, the solution for hydrodynamic channel flow with a time-dependent
pressure gradient is also given. The nature of viscous and magnetic drag on the
wall is discussed. By use of the convolution integral and superposition
principle, solutions can be obtained for any arbitrary time-dependent pressure
gradient. Calculations show the physical consequence of the solutions. Bibl. 8.
Engl.; summ. in Russ.

On the synthesis of an automated electro-mechanical drive of ships
steering wheel. **P. Khvedelidze, D.
Tavkhelidze, T. Mchedlishvili. **“Problems of Mechanics”. Tbilisi, 2006, ¹ 2(23),
pp. 33-36, (Russ.).

On a base of
analysis of structural scheme of electro-mechanical drive of the system of
automated management of a ship course and well-known works on the synthesis of
complex multi-coutour systems of regulation according to given transitional
processes it is offered a general scheme for the theory of synthesis and seme
basic mathematical relations, necessary for realization of synthesis
procedures. 1 ill. Bibl. 6. Russ.

SOME ASPECTS
OF FORMATION OF THE PROTECTIVE, ANTIFRICTIONAL LAYER ON THE FRICTION SURFACES
OF METALS. **T. Dgebuadze, S. Iashvili, V.
Zviadauri, M. Chelidze. **“Problems of Mechanics”. Tbilisi, 2006, ¹ 2(23),
pp. 37-43, (Russ.).

The
conditions of formation of thin antifrictional coatings on the metals friction
surfaces are studied and analysed and the parameters defining their working
capacity are revealed. Processes of the
formation of the working structures on the friction surfaces of model
materials: grey pig-iron CR-18, steel 45 and Y10 are studied. The received
results of researches enable to explain a complex of the phenomena which
provides formation of the protective antifrictional coatings. 6 ill. Bibl. 4.
Russ.

Calculation of Temperature Parameters of Rolled Disks.

**T.
Gerkeuli, Z. Gerkeuli, E. Ninoshvili. **“Problems of Mechanics”. Tbilisi, 2006, ¹ 2(23),

pp. 44-47, (Russ.).

In this article there is discussed the issue for
calculation temperature parameters in rolled disk during the process of
treating the flat surfaces in lightened condition. There are given formulas for
defining time and temperature of lightening the disk till established
temperature. Bibl. 3. Russ.

The method of experimental
determination of friction moment in a knuckle bearing. **R. Zukakishvili. **“Problems of Mechanics”. Tbilisi, 2006, ¹ 2(23),
pp. 48-54, (Russ.).

In this paper, we analyze the method of experimental
determination of moment _{} relative to
longitudinal axis. The installation for determination of friction moment by the
method of acceleration-deceleration in wind tunnel is shown. Radial ball-bearings
have been used as knuckle bearings. The block scheme for registration system of
experimental data is considered. 5 ill. Bibl. 2. Russ.

The paper
was presented possibility of using catalizators in internal combustion engines.
4 ill. Bibl. 2. Russ.

To the synthesis of electro-hydraulic
follower drive with nonlinear law of regulation. **E. Gegeshidze, L.
Khvedelidze, P. Khvedelidze, T. Mchedlishvili. **“Problems of Mechanics”.
Tbilisi, 2006, ¹ 2(23), pp. 60-65, (Russ.).

On a basis
of conducted investigations it is received the system of nonlinear differential
equations for the dynamics of a follower driver with nonlinear law of
regulation, basic regularities for application to the system of the synthesis
method by given transitional processes. 1 ill. Bibl. 5. Russ.

The
analysis of experimental methods of determination of moment M_{x}
relative to the longitudinal axis of bodies with small skewness. **R. Zukakishvili. **“Problems of Mechanics”. Tbilisi, 2006, ¹ 2(23),
pp. 66-72, (Russ.).

In this paper, we
consider the influence of friction in hinged units of LA model hanger in
aerodynamic pipes on dynamics of their rotation. Aerodynamic characteristics
and dynamics of different objects with small aerodynamic skewness are
experimentally investigated. 4 ill. Bibl. 3. Russ.

RESEARCH OF DYNAMIC
CHARACTERIZATIONS OF MAGNETOHYDRAULIC BRAKE ACTUATOR OF HOISTIBG MECHANISMS
WHILE MECHANISM BRAKING.

**S. Bitsadze. **“Problems
of Mechanics”. Tbilisi, 2006, ¹ 2(23), pp. 73-77, (Russ.).

In the present work are given results of
experimental reserch of magnetohydraulic pusher of a new construction. Analysis
of results of experimental researches shows that while using the pusher as the
brake actuator of hoisting mechanisms during bridging of brakes reaches
reduction of dynamic efforts in the elements of brake and hoisting mechanisms. 5
ill. Bibl. 4. Russ.

Computational program for calculation of
the constructions of aircrafts of composite materials. **D****. Kilasonia, N. Beridze,
N. Albutashvili. **“Problems
of Mechanics”. Tbilisi, 2006, ¹ 2(23), pp. 78-83, (Russ.).

On a basis
of the method of finite elements it is developed a computational program, which
can be used in calculation of shell, lamellar, rod-shaped constructions and
their combinations, realized from composite materials. The process of expansion
and perfection of this program is being continued. 6 ill. Bibl. 2. Russ.

Investigation of the stressedly-deformed
state of elastic spherical shell. **T. Gegelashvili****. **“Problems of Mechanics”.
Tbilisi, 2006, ¹ 2(23),

pp. 84-90,
(Russ.).

The system
of three equations for axial-symmetric deformation of a closed spherical shell,
undergoing instant localised impact by normal pressure, is given within the
framework of Timoshenko’s model. The solution of the initial-boundary problem
is represented by infinite series with respect to Legendre polynomials. The
coefficients of these decompositions satisfy the system of three ordinary
second order differential equations with constant coefficients, which should be
integrated for given initial conditions. 2 ill. Bibl. 3. Russ.

On one nonlinear analogue to the
initial-characteristic Darboux problem for a equation of nonlinear oscillation.
**R.
Bitsadze. **“Problems
of Mechanics”. Tbilisi, 2006, ¹ 2(23), pp. 91-95, (Russ.).

Nonlinear
analogue to the initial-charañteristic Darboux problem for a quasilinear
equation of nonlinear oscillation is given in the paper. The sufficient
conditions for global solvability of the initial-characteristic problem are
istablished. The regular solutions with its domains of definition are found. Bibl.
3. Russ.

Properties of lightweight concrete in articles and constructions in
the period of hardening after thermal processing. **G.
Khakhutashvili, L. Tvaradze.** “Problems of Mechanics”. Tbilisi, 2006, ¹
2(23), pp. 96-100, (Russ.).

In this
paper, the properties of lightweight concrete in composite and monolithic
constructions of buildings elements are given. Together with other
technological factors it was considered the influence of the methods of
electrothermal processing of concretes as the most acceptable method in
production of composite ferroconcrete articles and in building of monolithic
constructions. 3 ill. Bibl. 5. Russ.

Provision of the safety of buildings and
constructions by the methods of constructional and indestructible control. **M. Tsikarishvili, A.
Tsakadze, P. Koniashvili, L. Balavadze, K. Abuashvili. **“Problems of Mechanics”.
Tbilisi, 2006, ¹ 2(23), pp. 101-105, (Russ.).

The analysis
of influence of natural and anthropogenic catastrophes on buildings is given.
The methods of constructional and indestructible control for provision of the
safety of buildings are developed. 2 ill. Bibl. 3. Russ.

ON
CALCULATION OF SUPPORT CABLE SAG OF FLEXIBLE SUSPENSION BRIDGE. **B. Maisuradze. **“Problems of Mechanics”.
Tbilisi, 2006, ¹ 2(23), pp. 106-109, (Russ.).

The method
of calculation for concentrated load of support cable of suspension bridge with
flexible construction roadway by strained circuit design is considered. At
force calculation in suspension system bridge members by methods of structural
mechanics it is supposed that in spite of load variation circuit design system
is unchanged. However, in order to get accurate results it is necessary to
calculate the system by strained scheme. With this goal the expression is
derived for accurate determination of sag value under the action of uniformly
distributed load system on the weight of constructions and temporary load in
the form of concentrated force. The obtained results are checked with field
tests showing good coincidence. 2 ill. Bibl. 3. Russ.

BASIC PRINCIPLES OF AUTOMATIC SYSTEMS UTILIZATION FOR FORECASTING OT THE
ELECTROMAGNETIC COMATIBILITY (EMC) OF THE RADIOSYSTEMS. **V. Zurabishvili, T. Maziashvili, M. Kirimlishvili. **“Problems of Mechanics”.
Tbilisi, 2006, ¹ 2(23), pp. 110-114, (Russ.).

In the
article is described basic questions and problems of the Electromagnetic
Compatibility (EMC) of the radiosystems. The main task of the EMC is to provide
radiosystem operation without radio clutters (Radiointenference). During
construction of the new radiosystems it is necessary to forecast how the new
system will affect to the axisting radiosystem. For solution above-mentioned
problem is used automatic system, which provides: readout of cartography;
create of the virtual transceiver; calculate and analysis of the radio
coverage; optimization of basic characteristics and transmitting antenna
locations; control and print data bases. 2 ill. Bibl. 3. Russ.