**#****2 (35), 2009**

**SUMMARIES**

Research and design of
spherical FIVE-BAR slider-mobile guide (S-MG) mechanisms with
dwells of output link. ** N. Davitashvili. “**Problems of Mechanics”.

Research and design of spherical five-bar
slider-mobile guide mechanisms with two degrees of freedom with dwells of
output link is given. At the first stage of research the kinematic analysis of
these mechanisms is given. Further, two types of mechanisms are investigated:
with dwells of output link -rocker and slider. It is shown, that for one motion
cycle of an input link the output link in extremity positions has two stops.
The problem of design of spherical five-bar slider-mobile guide mechanisms with
dwells of output link is solved.* * 4 ill. Bibl. 20. Engl.; sum. in Russ.

General Principles of Drivelines Terminal Control.** C. Aksu, A. Milnikov. “**Problems of Mechanics”.

General Principles of Drivelines Terminal Control are suggested. The terminal state control problem applied to Drivelines Control is defined. It is shown that on the base of Driveline acceleration measurement it is possible to define a variational problem, solution of which permits to synthesize general Control function of Drivelines control process. The last function covers various particular control problems. It is shown, that these problems can be naturally defined by choosing of corresponding boundary conditions. As an example of such particular cases a problem of Acceleration is solved. The singularity problem in control function is discussed and solved. Conception of control process transient component is defined. Conditions of its presence are defined. 1 ill. Bibl. 5. Engl.; sum. in Russ.

TO QUESTION OF
OPTIMIZING CALCULATION OF MULTIMASS MECHANICAL SYSTEMS OF DRIVES. **T.
Mchedlishvili****, G Gratiashvili, M. Lomidze, A.
Asatiani, L. Ivanishvili. “**Problems of Mechanics”.

The major problems
of optimizing synthesis of widely used in practice mechanical systems of drives
(ÌS) are the problems
connected with reduction of dynamic loadings in elastic links of multimass
systems. Despite of many known results of the specified problems solution, the
last nowadays remain rather actual and first of all in the appendix to
structurally-difficult systems, in particular, to systems with the branched out
and circular-type structures. In the present work are considered the questions connected with working out of
the basic approaches to construction of applied methods of parametrical
synthesis of multimass systems of drives, the dynamic loadings directed on
reduction in elastic links. Bibl.
8 Engl.; sum. in Russ.

SPECIAL CONDITIONS OF THERMAL ENERGY
TRANSFORMATION AND INFRINGMENT OF SECOND LAW OF THERMODYNAMICS **A.Aptsiauri. ”Problems
of Mechanics”. ****“**Problems of
Mechanics”.

In the given
work on an example of direct and reversible cycles of thermal
installations is shown that if in a cycle of the thermal pump process of
cooling of a working body and accumulation of taken away heat on an
intermediate body occurs at the temperature exceeding an average on entropy
value of temperature in the course of cooling of a working body, together with
a cycle of the thermal engine, possibility of reception of thermal or
mechanical energy at the expense of energy of environment is created. At the
same time is offered ellementary example of the paradoxical converter of
thermal energy. 5 ill. Bibl. 3. Engl.; sum. in Russ.

The theory of turn of the adaptive motor vehicle chassis. **R****. Makharoblidze, Z.
Makharoblidze****.
“**Problems of
Mechanics”.

The theory of turning of the adaptive motor vehicle chassis intended as power units in small farms, is offered. A calculating formula for radius of turning is deduced for two variants: drive of all the six driving and steered wheels and without drive of front steered wheels. By the calculating formula are considered: lateral leading away of front steered wheels; re-distribution of the load on the wheels; hook resistance; coefficient of the differential gear black system; distance between centers of jointed in pairs tandem wheels constituting a counter-balanced suspension and other geometric, kinematic and dynamic parameters. The research results can be used in determining of exploitation indices of perspective mobile power units in the stage of their design. 4 ill. Bibl. 5 Engl.; summ. in Russ.

Definition of
positions of belonging to coupler spherical mechanisms points by sphere
rotation method. ** Z. Natsvlishvili, G. Namgaladze, I. Batsikadze, N. Machavariani. “**Problems of Mechanics”.

In the work is considered graphic
method of definition of geometrical figures movement on the spherical surface
which is the basic problem for the kinematic analysis and synthesis of
spherical mechanisms. Is offered the new approach to the solution of problems
of geometry in space which allows on the basis of elementary constructions
effectively define position of the points laying on coupler of spherical mechanisms. Practical
application of the developed technique to the solution of the problems
connected with kinematic research of complex spherical multilink mechanisms is
shown. 3 ill.
Bibl. 3. Engl.; sum.
in Russ.

KINEMATIC AND DYNAMIC
CONDITIONS ON THE INTERLAMINAR BOUNDARIES IN THE THEORY OF SHELLS WITH THE USE
OF SEVERAL BASIC SURFACES.** A.
Tvalchrelidze. “**Problems of Mechanics”.

The deformation of
multi-layer shells should lead to the disturbance of the cohesion of layers due
to their detachment from each other in the normal or tangential directions.
This should lead to the significant changes in the mechanical behavior of
shell, in its stress-strained state. There are given in the article the
settings of the corresponding conditions on the interlaminar boundaries in the
theory of shells with the use of several location surfaces, where the front
surfaces of layers are used as the location surfaces. 3 ill. Bibl. 2. Engl.; sum.
in Russ.

DEfinition
OF remaining life of pressure vessels
and apparatuses. **G.
Japaridze. “**Problems of Mechanics”.

Article is devoted to problems of definition of the remaining life of pressure
vessels and apparatuses. Stages of the remaining life definition are resulted. In particular, the mothods of carrying out of
technical diagnostics and design formulas of criteria of the limiting condition
on the remaining life which application probably to spend
an establishment of the
remaining life of pressure vessels and devices. Bibl. 3 Engl.; summ.
in Russ.

To problem of estimation of degradation processes in concrete and bridge
structures reinforcement.** T. Churadze, B. Maisuradze, n. Maisuradze, B. Chigvaria. “**Problems of Mechanics”.

Is developed the techniques for research of
condition of concrete and reinforcement of bridge structures. Thus is offered
to estimate the damage rate of concrete and reinforcement of bridge structures
on the basis of statistical analysis of the thickness of concrete protective
layer and joint influence of casual processes: carbonization, frosty damage of
concrete, diffusion of chlorides and reinforcement corrosion. The obtained data
can be used for development of probabilistic estimate technique of bridge
structures. 3 ill. Bibl.
5. Engl.; sum. in Russ.

Questions of
reliability control of Baku-Tbilisi-Kars railway on stages of design and
construction. **E. Moistrapishvili, M. Moistrapishvili, N.
Rurua, B. Bregadze. “**Problems of
Mechanics”.

In the work are considered the problems of permanent way components
reliability and are formulated the problems of international project
Baky-Tbilisi-Kars new railway reliability control. Are analyzed two basic
groups of impact factors: subjective and
objective factors, which undergo on the object reliability degree. Are
indicated such ways of impeding factors exception as making the objective and
competent examination and carrying-out of engineering supervision for
construction with purpose of according normative and technical and economic
documentation requirements assurance. Bibl.
3. Engl.; sum. in Russ.

Pulsation flow with
heat transfer**.****
V. Tsutskiridze, L. Jikidze.** **“**Problems of Mechanics”.

It is considered pulsating flow of
electro-conductive viscous incompressible liquid between two parallel walls,
which is caused by drop of pulsative pressure and by pulsative motion of walls
when external homogeneous magnetic field acts perpendicularly to the walls.
Bibl. 9. Engl.; sum. in Russ.

SELECTION OF WELDING FLUX FOR RESTORATION OF WHEEL PAIR’S WORN COMBS WITH
BUILD-UP WELDING TAKING INTO CONSIDERATION CLIMATIC CONDITIONS. **P. Kipiani, O. Kikvidze, S. Mindadze, A. Chumbadze. “**Problems of Mechanics”.

The
railway rolling-stock’s components and units represent the elaborate complex of
tribological systems, of the operation reliability of which, in many respects,
depends the safety of transportation. In the wheel-rail pair, in which there is
reproduced the rolling friction and friction with the slippage, there are
wearing the work surfaces and periodically there is required the restoration of
the geometric dimensions of the worn surfaces with the build-up welding. In
order to restore such work surfaces there is required the differentiated
selection of the build-up welding materials and their preparation before the
build-up welding, taking into consideration the climatic conditions of the
region, in which there is carried out the build-up welding. 2 ill. Bibl. 5.
Engl.; sum. in Russ.

ways of **M. Moistrapishvili, G. Enukidze, K.
Mchedlishvili. “**Problems of
Mechanics”.

In article are considered such caused by raised
level of motorization the undesirable phenomena, as growth of traffic
accidents and deterioration of
environmental safety. are
analyzed the existing situation and the questions put and executed in the world
under the decision of this problem. It is noticed, that safety of traffic is
the by the most considerable social and economic problem put by motorization
and the organization of movement and perfection of its technical equipment
concerns all complex of questions in which number the first is corresponding
development of a road infrastructure. In the form of an example one of ways of
the decision of the offered problem is offered: the technical and economy
substantiation of the new tunnel construction through Surami ridge. Is defined,
that it is necessary to develop legislative base of traffic safety on the basis
of scientifically proved recommendations and to carry out actions for
stimulation of highly skilled experts. Bibl. 8. Engl.;
sum. in Russ.

AN ELASTIC BODY IN THE SCALAR FIELD**. G. Karseladze, G.
Sadunishvili. “**Problems
of Mechanics”.

Using
representations of solutions of a system of homogeneous equations of static of
two component elastic mixtures, the concrete problem is solved when the contact
curves is a circumference. The solutions of the problem are obtained in the
form of absolutely and uniformly converging series. Bibl. 4. Engl.; sum. in
Russ.

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** **Research of technological and design data of
lightweight oncrete on local porous fillers. **M. Tananashvili****, Z. Megrelishvili. “**Problems of Mechanics”.

is considered the expediency of
lightweight concrete application in complex conditions of underground
construction. spent by authors
research of structural and technological parameters of lightweight concrete on
local porous fillers of Sagamo deposit have shown, that these concrete can be
applied in underground transport construction. 3 ill. Bibl.
12. Engl.;
summ. in Russ.