¹ 2(39), 2010


analysis and synthesis of manipulators on basis of spherical FIVE-BAR joint mechanisms. N. Davitashvili. Problems of Mechanics”. Tbilisi, 2010, ¹ 2(39), pp. 5-14, (Engl.).

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”. Tbilisi, 2010, ¹ 2(39), pp. 15-25, (Engl.).

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”. Tbilisi, 2010, ¹ 2(39),

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”. Tbilisi, 2010, ¹ 2(39), pp. 34-42, (Engl.).

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”. Tbilisi, 2010, ¹ 2(39), pp. 43-51, (Engl.).

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”. Tbilisi, 2010, ¹ 2(39), pp. 52-67, (Engl.).

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”. Tbilisi, 2010, ¹ 2(39), pp. 68-74, (Engl.).

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, I. Chkhetia. Problems of Mechanics”. Tbilisi, 2010, ¹ 2(39), pp. 82-84, (Engl).
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”. Tbilisi, 2010, ¹ 2 (40), pp. 85-91, (Engl.).

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, I. Chkhetia, N. Butkhuzi . Problems of Mechanics”. Tbilisi, 2010, ¹ 2(39), pp. 92-95, (Engl).

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”. Tbilisi, 2010, ¹ 2(39), pp. 96-102, (Engl.).

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”. Tbilisi, 2010, ¹ 2(39), pp. 103-108, (Engl.).

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”. Tbilisi, 2010, ¹ 2(39), pp. 109-115, (Engl.).

In the Tbilisi bypass railway project is accepted decision that in one of the bridge range the ravine water is passed to be specially arranged culverts by that would be avoided the infusion of accidently spilled oil products in the Tbilisi Sea. For the definition of results of oil space fall on to culvert is made decision to define stress by two stages by application of theory of elasticity. In the first stage the problem is solved by taking into account of slope’s reverse supporting. 2 ill. Bibl. 1. Engl.; sum. in Russian.