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 Mx 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.