SUMMARIES
¹ 2(39), 2010
analysis
and synthesis of manipulators on basis of spherical FIVE-BAR joint mechanisms. N. Davitashvili. “Problems of Mechanics”.
The structural analysis of manipulators is given on the basis of
spherical five-bar mechanism with two degrees of freedom and is finding out the
twenty one various types of spherical manipulators. the gripper’s operational volume of work range is determined
and is carried out the synthesis of spherical manipulator with revolute pairs
under the set law of gripper movement. Are defined the manipulator’s parameters
which gripper on the surface of sphere moved by spherical semi circumference as
well as along the initial meridian and equator. 10 ill. Bibl. 12. Engl.; sum. in Russian.
STRUCTURAL
ANALYSIS OF THE SPATIALLY TRANSFORMABLE SYSTEM MECHANISMS. V.
Gogilashvili, E. Medzmariashvili, M. Sanikidze, N. Tsignadze, Sh. Tserodze,
L. Philipenko. “Problems of Mechanics”.
The work reviews
structural and kinematical analysis of a pantograph type transformable system
having regular structural members in spatial transformation process; laws of
the geometric parameters variation of the mechanism is defined, which provide
the system deployment onto an arch surface. The obtained results enable
establishment of a dynamical model of the transformable arch system, on which
base it will be possible to discuss determination of optimal kinematical
parameters of the system at issue taking the program data into consideration. 13 ill. Bibl. 2. Engl.;
sum. in Russian.
influence of clearances on electric train motor car’s
brake linkage joint connections dynamic loadings values. G. Sharashenidze, S. Sharashenidze,
M. Dolidze, P. Kurtanidze,
G. panjavidze.
“Problems of Mechanics”.
pp. 26-33, (Engl.).
According of developed real dynamic
model for the purpose of definition of reaction and friction forces in joint
connections with clearances are consider tranquility of each lever and rod with
consideration of operating forces. Is shown that values of
real dynamical loadings are depended on the generalized coordinate’s
parameters, are obtained analytical expressions of reaction and friction forces
as well as for forces and moments of inertia with taking into account brake
cylinder’s brake force and car’s wheel tread pressing force on brake shoe.
2 ill. Bibl. 12. Engl.;
sum. in Russian.
Three mass electromagnetic
vibration machine dynamics research. H.
Tsulaia, M. Tedoshvili, M. Chelidze,
N.
Tsulaia. “Problems of Mechanics”.
In the work is developed
mathematical model of three mass electromagnetic vibration machine. By digital experiment are
investigated modes of masses resonance oscillation at various elastic elements
stiffness and asymmetry. 14 ill.
Bibl. 2. Engl.; sum. in Russian.
THE SUBSTANTIATION OF PNEUMATIC DEEPLY-LOOSENIRG
TECHNOLOGICAL PARAMETERS WITH THE USE OF EXPLOSION THEORY. R.
Makharoblidze, Z. Makharoblidze.
“Problems
of Mechanics”.
The search of resource-saving technologies of soil cultivation and
unpacking, and also of development of mountainous agricultural arable lands,
with, the help of moisture delaing on the slopes,
leads us to, the use of gas-dynamical effect. Elaboration of theory of
interaction of the compressed air and the soil environment, with the purpose of
substantiation of basic parameters of the technological process and working
organ, should favour a creation of the
resource-saving technology and technical means for soil cultivation. An attempt
is made in the article, to use with that end in view,
the achievements and methods of theory of explosion in deformable environment.
The functional dependences of the initial power and depth of feeding of the
compressed air, upon the degree of crush, radius, and volume of destruction of
the packed soil, are established in the form of analytical calculating
formulas. For making more exact the stated theory, a practical example of use
of the theoretical results and trends of subsequent researches is given. 3ill,Bibl. 7. Engl.; sum. in Russian.
NON-EQUILIBRITY OF
PROCESSES AND THE SECOND BEGINNING OF THERMODYNAMICS. A. Aptsiauri. “Problems
of Mechanics”.
In article is shown, that
consideration of processes of internal distribution of energy in thermal
processes at presence of gradients of thermodynamic parameters is very
important question for correct understanding of laws of thermodynamics and an
explanation of the conflict which arises between them at the analysis of some
physical processes. Considering these processes at the analysis of a rotating
stream between concentric cylinders in work is shown, that in energy isolated
stream entropy along current can decrease, that destroys the usual
representations about the second law of thermodynamics. 14
ill. Bibl. 6. Engl.;
sum. in Russian.
WEAR
SIMULATION OF THE WHEEL FLANGE - RAIL PAIR ON THE ROLLERS WITH LATERAL
SLIPPAGE. P. Kipiani, O. Kikvidze, S. Mindadze, A.I. Chumbadze. “Problems of Mechanics”.
The components and units of the railway vehicles represent a
complex aggregate of tribological systems and the
transportation safety depends on the reliable operation of them. In the
wheel-rail pair, wherein is reproducing the rolling friction and slippage
friction there are wearing the operating surfaces. The wear tests with rollers
at lateral slippage have enabled us to identify four wear modes and to isolate
the conditions when they are taking place. There is substantiated the transfer
of results of physical simulation to the real pair wheel flange–lateral surface
of rail. Besides, there is emphasized the necessity to take into consideration
the scale factor as well. 6 ill. Bibl.
8. Engl.; in Russian.
expression of solution OF
simultaneous differential equations OF stationary
oscillations IN moment THEORY of termoelasticity. L. Giorgashvili, M. Khmiadashvili,
K. skhvitaridze,
M. Kharashvil i. “Problems of Mechanics”. Tbilisi,
2010,
¹ 2(39), pp. 75-81, (Engl.).
In the work is received formula of general solution of simultaneous
homogeneous differential equations of stationary oscillations in moment theory
of thermo elasticity, that is expressed by six meta
harmonic functions. Is proven the theorem which gives the possibility to accept
for displacement vector at approximation of infinitely remote point the Sommerfeld-kupradze
type irradiation conditions, that has significantly importance for proving
boundary problems solution uniqueness theorem. Bibl.
5. Engl.; sum. in
Russian.
Improvement
of TRANSPORT SYSTEM effectiveness by APPLICATION OF LOGISTICs principles. O.
Gelashvili, N. Butkhuzi,
The article discusses the
importance of transport system in the conditions of national economy
development and its economic growth, are analyzed in recent years the volume of
freight traffic and transport service quality level improvement indicators.
Application of adopted in practice methods and models is providing material and
data flow management and reduce operational costs of transportation, that is
carried out based on the logistics principles and increases the efficiency of
the transport system. Bibl. 2 Engl.; sum. in Russian.
application of volumetric matrix in cryptography. G. Kotrikadze. “Problems of Mechanics”.
In the article are described the large matrix of information
security methods, enciphering
and deciphering procedures. Are
calculated the methods characteristics such as: rate, number of operations to
be carried out, cracking probability, and cryptoanalysis
complexity. Are compared the methods according to their characteristics, which
are presented in the form of tables and diagrams. The obtained methods are
characterized by high stability. 3 ill.
Bibl. 16. Engl.; sum. in Russian.
TRANSPORT LOGISTICS dataware. O. Gelashvili,
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 ćšóēīļåšåāīēīź
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. 2
ill. Bibl. 3 Engl.;
sum. in Russian.
REPRESENTATION of general SOLUTION OF simultaneous
differential equations of stationary oscillations of micropolar theory of
thermoelasticity. L. Giorgashvili,
G. Sadunishvili, G. Karseladze. “Problems of Mechanics”.
In the work is received
formula of general solution of simultaneous homogeneous differential equations
of stationary oscillations of micropolar theory of thermoelasticity. The solution is expressed by means of
seven metaharmonic functions. Received representation
gives the ability to write down Sommerfeld-kupradze irradiation conditions.
Received representation gives the possibility to solve the boundary and
boundary-contact tasks for having defined geometrical shapes bodies. Bibl. 4. Engl.; sum. in Russian.
application of critical loading definition method on
plate with cut to solution of practical problems. G. Kipiani, T. Andjaparidze,
E. Kristesiashvili. “Problems of Mechanics”.
on
the basis of thin plates theory with application of elements of generalized
functions theory is solved the problem of definition of critical compressive
loading on three-layered orthogonal plate with through finite length cut. Bibl.
6. Engl.; sum. in Russian.
To problem of estimation of
degradation processes in concrete and bridge structures reinforcement. T. Churadze, G. Bagaturia,
B. Maisuradze, D.
Kublashvili. “Problems of Mechanics”.
In the