PROFESSOR RASIM ALIZADE - ONE AN OUTSTANDING SCIENTIST IN THE FIELD OF MECHANISM AND MACHINES SCIENCE. “Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 5-6, (Engl.).
research of automatic manipulator created on the basis of spherical four-bar slider-crank mechanism. N. Davitashvili. “Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 7-14, (Engl.).
Is stated description, principle of operation and kinematical research of automatic manipulator that is created by spherical four-bar slider-crank mechanism. The automatic manipulator represents spherical six-bar mechanism, the kinematical parameters of that are defined by analytical methods. Obtained results give the possibility to solve the tasks of kinematical synthesis and dynamics of spherical automatic manipulator. 3 ill. Bibl. 10. Engl.; sum. in Russian.
KINEMATIC SYNHTHESIS OF FUNCTION GENERATING SPATIAL RTSR MECHANISM BY CHEBYSHEV APPROXIMATION. Duygu Çömen, İlkay Erkılınçoğlu, Mehmet İsmet Can Dede. “Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 15-20, (Engl.).
In this study, RTSR mechanism is chosen to generate an output function by using the technique of Chebyshev approximation. Equal spacing helps to determine the precision points in the mechanism. The error value is added to the objective function and considered as a parameter during the calculation. The new precision points are obtained from the roots by taking the derivative of the objective function. The recursive process is carried out until the absolute error values are stabilized within the preset tolerances. Results are given in tables and graphs. 3 ill. Bibl. 13. Engl.; sum. in Russian.
Carnot's theory as a special case and the violation of the second law of thermodynamics due circulation of heat in one-dimensional supersonic flow of heat-conducting gas. A. Aptsiauri. “Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 21-34, (Engl.).
the article is shown that the compression shock in supersonic flow is
characterized by properties that at increasing of the thermal conductivity of
gas, or at decreasing the Prandtl number
() leads to a violation of the second law of thermodynamics that is expressed in the creation of possibility of generating energy from the heat of the equilibrium environment. It is shown that the Carnot cycle is valid only for those cycles in that are applied equilibrium in space actuating medium. 12 ill. Bibl. 8. Engl.; sum. in Russian.
RESULTS OF diesel engine research With FUEL preliminary treatment. O. Klyus. “Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 35-38, (Engl.).
In the article presents results of preliminary tests of diesel engine fuel system at application of catalyst and turbulizing fuel treatment in the nozzle. This treatment is carried out directly in the sprayer body before fuel injection into the combustion chamber. Tests were conducted in a laboratory setup, allowing recording the development fuel jet, as well as in the single-cylinder NVD-24 type diesel engine compartment 4 ill. Bibl. 2. Engl.; sum. in Russian.
modes of vehicles traffic condition and fuel effectiveness. O. Gelashvili, P. Bezhanishvili. “Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 39-43, (Engl.).
The problem of rational use and economy of fuel-energy resources is especially important for motor road transport that belongs to one of the basic consumers of liquid petroleum fuel. One of the main trends in reduction of fuel operational is presented y perfection of the fuel management system. Management task consists in to provide, grounded on the scientific - technical progress, for vehicle movement real in conditions, the optimal value of fuel operational costs.
The stated in the article energy investigation of vehicle traffic modes stipulates on the basis of application of fuel rating, account and control scientifically grounded actions development operational costs of the fuel management system that provides rolling stock application and drivers training quality improvement. 1 ill. Bibl. 5 Engl.; sum. in Russian.
A ROD MODEL OF ELECTRICAL MACHINES: CONCEPT AND BASIC EQUATIONS. A. Tvalchrelidze. “Problems of Mechanics”, Tbilisi, 2012, ¹ 1(46), pp. 44-48, (Engl.).
For describing the electromechanical conversion of energy in the electrical machines there is proposed in a given article to examine the interactions of electro-conductive rods located along the axis of the machine. There are obtained the fundamental relationships for the case of direct currents. In the follow-up articles there will be examined the alternating currents and cores’ magnetization phenomena. 3 ill. Bibl. 2 Engl.; sum. in Russian.
stability of front wheel of automated additional load system of TANDEM-wheeled self-propelled chassis. R. Makharoblidze, I. Lagvilava, O. Asatiani, A. Kobakhidze. “Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 49-54, (Engl.).
The possible functional design of front wheel of automated additional load system of tandem-wheeled self-propelled chassis is offered. The mathematical model of automated system functioning is composed. From conditions of stability and rate of transient process damping are generated relations for calculation of geometrical, kinematical and dynamical parameters of system. 1 ill. Bibl. 3. Engl.; sum. in Russian.
MATEMATICAL MODEL AND EXPERIMENTAL RECEARCHES OF THE TECHNOLOGICAL PROCESSES OF COVERING OF THE WALL SURFACES WITH THE HALP OF WIBRATIONS. M. Chelidze, V. Zviadauri, M. Tedoshvili, G. Tumanishvili. “Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 55-59, (Engl.).
The Summary: In the work theoretically and practically are shown particularities of compactions and covering of fluid plastic concrete mixture on wall surfaces. There are brought mathematical models, describing technological processes and protection îðåðàòîðà from influence of the vibrations. The Problem of provision of covering monolith on walls are solved by means of two-stage fixing of cover layer. For the reason of reductions of vacuum tractive power, at flybacks of the vibrator, between surfaces of working and fluid concrete is aplied cellophane film. 12 ill. Bibl. 4. Engl.; sum. in Russian.
ON ONE APPLICATION OF THE CHARACTERISTIC METHOD. R. Bitsadze, S. Bitsadze. “Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 60-66, (Engl.).
The paper proposes a nonlinear analogue of the characteristic Goursat problem is proposed for a nonlinear oscillation equation, which makes it possible to simultaneously define a regular solution and its extension domain. For this purposes the classical characteristic method is used. Bibl. 2. Engl. Sum. In Russian.
NON-STATIONARY FLOW OF A NONLINEAR-VISCOUS-HARDENING MATERIAL IN THE PIPE. O. Kikvidze, S. Zakenov. “Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 67-71, (Engl.).
The non-stationary laminar flow of a viscous-plastic material in a pipe on the basis of the creep theory is considered. The nonlinear differential equations are solved numerically by method of straight lines in a combination to a method of continuation of the decision on parameter. Results of research are necessary for pipeline calculation at transportation of viscous materials, oil and oil products. 2 ill. Bibl. 3. Engl.; sum. in Russian.
analysis of spherical two-layer shells with constant thickness layers by method of initial parameters. J. Bichiashvili, Z. Bichiashvili, M. Moistsrapishvili, G. Bichiashvili. “Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 72-78, (Engl.).
In the article is carried out analysis of a free, spherical two-layer (both layers are made from same but differently oriented materia,), orthotropic shell with constant thickness layers, the both layers thickness of are similar. The shell represents a hemisphere with a central hole, characterized by an angle α0 = 30 °. The outer edge of the shell is rigidly supported. On the shell is applied vertical axisymmetric load p=1 N/cm, distributed on the intersection circumference of the median surface of the shell with a central hole. The radius of median surface meridian of the shell makes up to R=200 cm and the thickness of each layer makes up to δ = 40 cm. The total thickness of the shell makes up to 40% of its average radius. As design surface is accepted median surface of the shell. The meridian of design surface of the shell is divided on the number of sites k=500. The computer calculation program provides a solution to the more general problem than that considered in this paper. 4 ill. Bibl. 3. Engl.; sum. in Russian.
Deterioration of rails and wheels on pass spans Georgian railway at trains curvilineat movement. A. Sharvashidze, d. Chitadze. “Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 79-81, (Engl.).
The most non-desired kind of train’s movement that is related to the movement of eight-axle rail-cars curvilinear movement on small radius pass spans of Georgia main railway is considered. These spans from the point of view of intensity of deterioration are characterized by negative indices that reduce the service life of rails heads and wheels flanges, which are often remove from the operation much earlier than their expiration term. In addition the curvilinear spans restricts the movement speed thus with other important actions is advisable to maximal reduce multiaxis transport means movement and fully will be used there only four-axle rail-cars. Due studies is defined that is advisable instead of two contact touch of wheels with rails to apply one contact touch that promotes to reduce the deterioration between contact surfaces. The stated proves on Georgia main railway importance of elimination of small radius non-standard curves that gives the possibility to increase at those spans train traffic speeds. 1 ill. Bibl. 7. Engl.; sum. in Russian.
improvement of producing capacity of CAr-repair facility’s carriage’s assembly workshop by flow-line conveyor method of freight railcars repair. A. Sharvashidze, m. Paturashvili, Z. Paturashvili. “Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 82-86, (Engl.).
The optimal and rational layout of carriages location on the flow-line - conveyor lines of carriages assembly workshop of car repair facility is considered. In such a scheme would be minimal loss of time while moving carriages from one position to another. At increasing of mechanization and automation level also improves capacity of carriage assembly workshop. Is received the maximum stabilization of in-cycle synchronization between repair positions. In facilities each flow-line - conveyor lines are specialized for the repair of one type of freight carriages. It is economically feasible and acceptable to those countries where a small fleet of freight carriages is. 1 ill. Bibl. 4. Engl.; sum. in Russian.
Academician Robert Adamia “Problems of Mechanics”. Tbilisi, 2012, ¹ 1(46), pp. 87-88, (Engl.).