PROBLEMS OF MECHANICS
Dynamic analysis of spherical five-link mechanisms with two degrees of freedom and concentrated masses of elastic links. N. Davitashvili. “Problems of Mechanics”. Tbilisi, 2005, ¹ 1(18), pp. 11 – 22, (Engl.).
In this paper, an analysis of spherical five-link hinged mechanisms with two degrees of freedom is given. 18 kinds of spherical five-link mechanisms are revealed. A dynamic investigation for one case of spherical five-link mechanism with concentrated masses of elastic links has been conducted. The mechanism is considered as a five-mass system, which motion is described by 8 nonlinear differential equations, four of them describe a motion for electromotors, two characterize a basic motion of the mechanism and two – a mass oscillation of a junction point of connecting rods. The received results enabled to design, manufacture and use in technics a spherical five-link mechanism for cutting volumetric ornaments, used in furniture industry. 5 ill. Bibl. 10. Engl.; summ. in Russ.
Mechanisms for opening / closing windows of car side doors. Paun Antonescu, Ovidiu Antonescu. “Problems of Mechanics”. Tbilisi, 2005, ¹ 1(18), pp. 23 – 29, (Engl.).
In the paper we present the mains types of the mechanisms used for opening and closing of windows pane from the cars side doors. It is identified the three types of the mechanisms used as “crane” for the doors windows pane: the mechanisms with bars and gears, the mechanisms with elastic rack, the mechanisms with cable. The mechanisms with bars and gears, which is used for open/close of window pane of the lateral doors of cars, have in their structure as main component the planar linkages. The four bar linkage type crank-rocker, crank-slider and parallel-crank mechanisms are analyzed. We mention that all the constructive and kinematical schemes, which are presented by authors, after studying the mechanisms existed on the automotive, are completely news. 8 ill. Bibl. 5. Engl.; summ. in Russ.
Influence of clearance and force characteristics on precision of the kinematic and dynamic parameters of an operational transmission of some units of a railcar. G. Sharashenidze, S. Sharashenidze, K. Aladashvili. “Problems of Mechanics”. Tbilisi, 2005, ¹ 1(18), pp. 30 – 36, (Engl.).
The paper deals with consideration of precision values of kinematic and dynamic parameters of an operational transmission of a compressor of railcar’s refrigerator machine taking into account clearances and acting forces in hinged joint. For determination of quantitative indicators of physical processes in the area of a clearance it is developed a program complex and for evaluation of qualitative and quantitative characteristics for transmission’s piston or connecting-rod it is conducted calculation experiment. For determination of precision of parameters we use the generalized variable coordinates of hinged joints with clearances of a transmission. We take into account geometrical sizes of levers of a transmission, the value of offset and force characteristics. The errors of displacement, velocity and acceleration of transmission’s piston, and also the errors of reaction force in the hinged joint with clearances and characteristic parameters of the connecting-rod are investigated. The investigation is of general type and it can be used for investigation of any mechanical transmission containing connecting-rod-piston group. 7 ill. Bibl. 8. Engl.; summ. in Russ.
WAVELET – TRANSFORMATION AND SOME OF ITS
FEATURES. S. Bliadze, M. Tsikarishvili,
G. Goguadze, Z. Seskuria, T. Rekhviashvili. “Problems of Mechanics”. Tbilisi,
¹ 1(18), pp. 37 – 41, (Engl.).
The opus deals with wavelet transformation, possibilities of its usage and some of its features, also, comparison of the wavelet and the Fourier analyses and some advantages of the wavelet analysis compared with Fourier analysis. At last, one typical example is reviewed. 3 ill. Bibl. 4. Engl.; summ. in Russ.
CALCULATION OF RESISTING FORCE TO DEFORMATION ACCORDING TO THE INCOMPLETE CONTOUR OF AND THERMOMECHANICALLY PROCESSED (TMP) AN A PLANE ROLLER. D. Kasradze, T. Kasradze, G. Gachechiladze. “Problems of Mechanics”. Tbilisi, 2005, ¹ 1(18), pp. 42 – 48, (Engl.).
In the article a differential equation for calculation of contact stresses during restoration of a worn plane by surfacing and thermomechanical deformation on the incomplete contour of the section of a surfacing roller. The corresponding formulation is obtained. 4 ill. Bibl. 5. Engl.; summ. in Russ.
Questions of treatment of new mathematical models for
evaluation of capacity for work of geometrically complex systems. S. Bliadze, V. Balavadze, G. Goguadze,
A. Katsadze, M. Tsakadze. “Problems
of Mechanics”. Tbilisi, 2005,
¹ 1(18), pp. 49 – 52, (Russ.).
It is presented a questions of treatment of new mathematical models from the point of view of capacity for work of geometrically complex mechanical systems. On the basis of a personal computer it is work out the system of automatized calculation of the tensely-deformed condition of a complex systems. One in a most effective numeral methods of solution of the problems of construction mechanisms and the mechanics of the deformed solid – the method of the finite elements underlies in the basis of program packet. 1 ill. Bibl. 7. Russ.
The Analitical method of presentaton of charakteristic fuel injection in diesel engines. O. Klyus. “Problems of Mechanics”. Tbilisi, 2005, ¹ 1(18), pp. 53 – 56, (Russ.).
The ðaper presents analitical methods of characteristic fuel injection in diesel engines and proposed quantitative method presentation of this characteristic. 2 ill. Bibl. 12. Russ.
THE RESEARCH OF CUTTING FORCES DEPENDENCE ON MODES AT MATERIAL TREATMENT BY CUTTERS OF HIGH-SPEED STEELS AND CARBON-FREE HIGH-SPEED ALLOY. A.I. Sahradyan. “Problems of Mechanics”. Tbilisi, 2005, ¹ 1(18), pp. 57 – 61, (Russ.).
of treatment by steel cutting of 45, 2Õ13, Ð18 marks and titanium alloy ÂÒ5 are
researched. The treatment is fulfilled by cutters made of non-carbonic
quick-cutting alloys. The dependences of cutting forces on cutting modes are
investigated. The dependences of cutting forces on physical and mechanical
properties of treated metals are set. For each pair “cutter-treated metal” the
impact on cutting force of pressure, temperature and friction condition in
contact zone are researched.
3 ill. Bibl. 3. Russ.
construction of approximate mathematical model of dynamics of a following
mechanism of a rotary profile – grinding machine.
B. Navrozashvili, T. Mchedlishvili, K. Gvazava, T. Mchedlishvili. “Problems of Mechanics”. Tbilisi, 2005, ¹ 1(18), pp. 62 – 66, (Russ.).
On the basis of kinematics of relative motions of grinding pneumatic actuators and rough work-piece, realized in rotary – grinding machine for processing profile-composite wood details, it is obtained new mathematical dependencies of expressions for deformation of pneumatic actuators, kinetic and potential energies of investigating system, generalized forces and partial derivatives of central components of potential energy, necessary for construction of a simplified model of dynamics. 2 ill. Bibl. 2. Russ.
To the question
of constructing a mathematical model for dynamics of electric locomotive during
its motion on straight sections of railway line. G. Chkhaidze, A. Chkhaidze, T. Mchedlishvili. “Problems of Mechanics”. Tbilisi, 2005,
¹ 1(18), pp. 67 – 73, (Russ.).
The questions connected with constructing a mathematical model for dynamics of system “electric locomotive railway line” taking into account dynamic phenomena in chains of tractive drives are considered. Mathematical expressions for kinetic and potential energies, generalized forces, and also a scattering function of energy for considering system during the motion of electric locomotive on straight section of railway line are obtained. 2 ill. Bibl. 7. Russ.
The algorithms of construction of stiffness matrices of finite elements for thin-walled airframe structures from composites. D. Kilasonia, N. Beridze. “Problems of Mechanics”. Tbilisi, 2005, ¹ 1(18), pp. 74 – 82, (Russ.).
The detailed algorithms of construction of a stiffness matrix of rectangular lamellar finite element from laminated composites, taking into consideration both bending and diaphragm effects which can be used for the approximation of shell airframe structures, and their particular versions for the flange of spars and walls of both longerons and ribs developed. The algorithm of construction of a stiffness matrix of laminated composite rot is also given. 3 ill. Bibl. 5. Russ.
On the issue of manufacturing automobile gas ballons. M. Shvangiradze, T. Gerkeuli. “Problems of Mechanics”. Tbilisi, 2005, ¹ 1(18), pp. 83 – 87, (Russ.).
A brief review of classification and designs of automobile gas balloons of high pressure is given in the article. The question of reinforcing balloons with a basalt string which is well produced in Marneuli Region, Georgia is raised in the article. The kinematics of process of winding is studied on the basis of which a special winding machine is projected and produced at present. 6 ill. Bibl. 1. Russ.
STABILITY OF PROCESS OF DISTRIBUTION OF THE STILLAGE.
M. Baghdasaryan, A. Markaryan. “Problems of Mechanics”. Tbilisi, 2005, ¹ 1(18), pp. 88 – 91, (Russ.).
At distillation of wheat spirit as a secondary material a great quantity of a malt – residue, which is a valuable forage for domestic animals, is formed. For mechanization of the process of dispensation of a malt – residue, a conforming fodder distributor providing regulation of output of the feeding slop is developed. For the concrete design parameters of the distributor, the graphs of dependencies reflecting profiles of the model of adjusting gear are obtained, which provides necessary constant output of malt - residues during dispensation. 3 ill. Bibl. 1. Russ.
Building of a
roundabout road in a crossing section. T. Churadze,
T. Kupatadze. “Problems of Mechanics”. Tbilisi, 2005, ¹ 1(18), pp. 92 - 97, (Russ.).
On a basis of investigation of the traffic capacity of a crossing section of railroad, the analysis of building of a roundabout road in the zone of Surami mountain ridge is carried out. The questions of building of double-track tunnel in complicated engineering-geological conditions are considered. 2 ill. Bibl. 7. Russ.
of transcaucasian trunk railway in south direction.
T. Kupatadze. “Problems of Mechanics”. Tbilisi, 2005, ¹ 1(18), pp. 98 – 103, (Russ.).
It is considered the questions of a history of a building of the south direction railway Teephlis-Kars. It is underlined the important political, strategic, economic and cultural significance of the stated line development for all the Transcaucasus, in particular for Armenia. 1 ill. Bibl. 5. Russ.