INFLUENCE OF THE SIZE OF CLEARANCE ON THE ACCURACY OF BASIC KINEMATIC AND
DYNAMIC PARAMETERS OF BRAKE GEAR OF A RAILCAR.
N. Davitashvili, G.Sharashenidze. “Problems of Applied Mechanics”. Tbilisi,
2004, ¹ 1(14), p. 9-15 , (Engl.).
In present work, the accuracy of the basic kinematic and dynamic parameters of brake gear of a railcar’s wheel with one-sided press of shoes taking into account increased clearances in all joints is investigated. The problem of accuracy is investigated with the use of a computational program, developed for the most loaded links of joint. There are obtained the numerical characteristic parameters for frictional forces and reaction, and also for the angular velocity of rotation of intermediate link with the different values of the coefficient of dry friction. Results are represented in the form of graphs and diagrams of the dependence of parameters being investigated. 4 ill. Bibl. 8. Engl.; summ. in Russ.
KINEMATIC ANALYSIS FOR A PLANE ANALOG OF FIVE-LINK MANIPULATOR. G. Naruslishvili.
“Problems of Applied Mechanics”. Tbilisi, 2004. ¹ 1(14). p. 16-21 , (Engl.).
It is given the kinematic investigation of a plane analog of five-link manipulator, replacing the displacement of operational unit of a mechanism along a spiral line. The functional dependence between the low of motion of the manipulator and the parameters of the plane analog is given. 4 ill. Bibl. 6. Engl.; summ. in Russ.
BRIDGE DECK DISPLACEMENT CONTINUOUS MEASURING DEVICE AND PERIODICAL REALIGNMENT
SYSTEMS FOR SLOW MOVING LANDSLIPS DESIGNED TO MINIMIZE TRAFFIC INTERRUPTIONS.
G. Danieli, G. Fragomeni, D. Mundo. “Problems of Applied Mechanics”. Tbilisi,
2004. ¹ 1(14). p. 22-29, (Engl.).
The paper presents the most recent developments on electronic bridge control studied for a bridge located along a southern Italian Motorway in an area where a landslip is in slow yet continuous motion. A previous bridge was closed for beam misalignment caused by the landslip action. A new bridge was recently designed with much sturdier foundations, but even during the initial construction phases it was evident that a static solution was undesirable, if not impossible. Jet, based on the observations of the last twenty years, tire foreseen movements are relatively small, 20 cm being the maximum horizontal measured displacement in that period. A further version of the bridge has thus been proposed, characterised by lighter and longer decks, in order to negotiate the section with fewer elements. Moreover, the monitoring and repositioning systems have been thoroughly redesigned, to allow an almost continuous adjustment of the bridge decks, severely limiting the realignment times, in order to reduce traffic interruptions. A reduced number of interferometer lasers have been used in the project, using rotating drums with mirrors individually preset to sweep the entire measuring field. Lifters will substitute the props as active connections between pillars and decks, thus being able to support all traffic induced dynamic stresses in both vertical and horizontal direction. On the top of each lifter an elastic interface bearing strain gauges will enable the measurement of tangential stresses as well as uneven distribution of the load, providing further information on the necessity of beams realignment. 10 ill. Bibl. 11. Engl.; summ. in Russ.
SELECTED SAFETY MODELS OF ELEMENTS AND SYSTEMS IN THE ENGINE ROOM. Z. Matuszak.
“Problems of Applied Mechanics”. Tbilisi, 2004. ¹ 1(14). p. 30-39, (Engl.).
The idea of technical safety system had been characterised. Presented were basic models of technical safety systems regarded highest measures of safety. Chosen measures of safety were included. Safety measures were illustrated with Kolmogorow equations. A safety analysis on the basis of the Engine Room technical system with renewable elements was presented. It was illustrated, among others, with Kolmogorow equations. Measures of readiness and unreadiness as well as other measures of unreliability were indexed. 3 ill. Bibl. 4. Engl.; summ. in Russ.
NEW REFRIGERANTS ALTERNATIVE TO FREON IN REFRIGERATION INSTALLATIONS, HEAT
PUMPS AND AIR CONDITIONERS. B. Zakrzewski,
T. Lokietek. “Problems of Applied Mechanics”. Tbilisi, 2004. ¹ 1(14). p. 40-46, (Engl.).
The threats for a safety and protection of an environment caused by means of the refrigerated cargo transport were introduced in an article. Further step was the introduction of coefficient of the Total Equivalent Warming Impact TEWI, which contains of three components: the emission of refrigerant to atmosphere, the recycling of a substance and influence of an efficiency of devices on CO2 emission (the consumption of an electric energy is connected with CO2 emission by its production). In the effect of a calculations of the row of solutions for refrigerating installations with different refrigerants, the actual influences on TEWI coefficient was shown. 6 ill. Bibl. 18. Engl.; summ. in Russ.
KINEMATIC PECULIARITIES OF TEA PRUNING APPARATUS (TPA) WORKING TOOLS. N. Gabunia,
N. Pkhakadze. “Problems of Applied Mechanics”. Tbilisi, 2004, ¹1(14), p. 47-53,
An analysis of kinematic peculiarities of working tools of tea pruning apparatus as well as a table of main values of their kinematic parameters and transfer functions, which enable to make calculations with practically any degree of reliability with the use of modern computer facilities, are given. 3 ill, bibl. 4. Russ.
SUBSTANTIATION OF THE CRITICAL RATE OF FREE CUTTING OF VEGETABLE MATERIALS.
R. Makharoblidze, Z. Makharoblidze, Ph. Ksovreli. “Problems of Applied Mechanics”.
Tbilisi, 2004, ¹ 1 (14), p. 54-56, (Russ.).
On the basis of the theory of percussion, taking into account the contact stresses at dynamic percussion of the cutting tine with the vegetable material, a formula for calculation of the critical rate of percussive free cutting, is deduced. The formula enables to determine more substantially, constructive, kinematic and dynamic parameters of the rotary working organs of the cutting and harvesting agricultural machines. The theoretical results are supported by the practical example. Bibl. 3. Russ.
SUBSTANTIATION OF THE CRITICAL RATE OF ROTARY TILLAGE.
R. Makharoblidze, G. Charakashvili, K. Torikashvili, P. Benashvili. “Problems of Applied Mechanics”. Tbilisi, 2004, ¹ 1 (14), p. 57-59, (Russ.).
Having used the results of theoretical research of the process of percussive interaction of a rotary tiller’s working organs and top-soil, a formula for calculation of the critical rate of rotary tillage, is deduced. The formula enables to determine more substantially, constructive, kinematic and dynamic parameters of the rotary tilling machines. The theoretical results are supported by the numerical example. Bibl. 2. Russ.
DEVELOPMENT AND EXPERIMENTAL RESEARCHES OF AUTOMATIC MOISTURE METER OF A FISH
FLOUR. À. Khurtsilava, T. Japaridze. “Problems of Applied Mechanics”. Tbilisi,
2004, ¹ 1 (14), p. 60-65, (Russ.).
Automatic moisture meter of a fish flour ABPM-1, which without participation of the man continuously measures, shows on a scale and registers on the diagram humidity of a semifinished item of a fish flour on an exit from a continuously working drying drum is developed and is experimentally investigated. The experimental researches are carried out with the purpose of definition of a degree of influence of temperature changes on the indication of the device, and also error of measurement of humidity of moisture meter. Moisture meter has a standard exit on the automatic regulating device. The groups of the characteristics of the indication of the device and increment of capacity of the gauge as functions of humidity on various temperatures of a fish flour is given. 3 ill. Bibl. 8. Russ.
THE DEVELOPMENT OF KEY CRITERIA FOR CREATION OF SMALL MECHANIZATION FOR SURFACE
TREATMENT OF ROAD PAVEMENT IN THE LIGHT OF MODERNIZATION OF APPROPRIATE CONSTRUCTIONS
AND BUILDING TECHNOLOGIES. V. Goglidze. D. Burduladze, P. Nadirashvili, B.
Goglidze. “Problems of Applied Mechanics”. Tbilisi, 2004, ¹ 1 (14), p. 66-68,
The problem of road dress treatment was discussed. The current methods of a surface treatment are characterized with high cost and complexity of technology of construction, which entails the necessity for taking further efforts to modernize them. The most promising in this direction is utilization of bitumen mastic instead of bitumen. The method of road surface treatment has been recommended using l-1.5mm-thick hot bitumen mastic with further graveling. 2 ill. Bibl. 3. Russ.
WORKING OUT ANALYTICAL MODEL FOR DEFINITION OF ECONOMY AND TOXIC OF DIESEL
LORRIES. O. Ghelashvili, N. Navadze, G. Emiridze. “Problems of Applied Mechanics”.
Tbilisi, 2004, ¹ 1 (14), p. 69-71, (Russ.).
It is given the analysis of the fuel economy and toxic of diesel lorries and it is received the models for a definition of the amount of thrown out an unhealthy matters depending on the operational lorry’s and its engine’s parameters, permitting analytically definite the toxic of the concrete lorry in a concrete operational conditions. 1 ill. Bibl. 3. Rus.; res. Engl.
THE CAD SYSTEM OF SINGLE PHASE PWM INWERTORS WITH SINUSOIDAL OUTPUT VOLTAGE
. G. Bareghamyan. “Problems of Applied Mechanics”. Tbilisi, 2004,
¹ 1 (14), p. 72-75, (Russ.).
The CAD of high power single-phase stabilizatied invertors with the pulse-width-modulated sinusoidal output voltage is described. The system allows to calculate: the voltage and current in the circuit, the power losses in separate branches and the preliminary estimation of the efficiency of the invertor, as well as other design parameters. It is possible not only to calculate the ideal circuit, but also to take account of the important parameters of the real circuit. 4 ill. Bibl. 6. Russ.
CALCULATION OF BASE OF SUPER-FAST RAILWAY AND MAIN ROADS.
T. Churadze, V. Goglidze, M. Moistsrapishvili, N. Kvachadze. “Problems of Applied Mechanics”. Tbilisi, 2004, ¹ 1 (14), p. 76-79, (Russ.).
It is formulated and in analitic form solved the problem of a multi-layered plates on the elastic Winkler’s base within the limits of the theory of elasticity. It is defined the moments of deflection from a vertical load for the separate layers of a plates in the transversal direction and the efforts of shear on a contact of the adjacent layers from the horizontal force. It is obtained an expression for a calculation of the summary moment of deflection from a vertical and horizontal loads. 2 ill. Bibl. 3. Russ.
DEVELOPMENT OF THE CIRCUITS OF TARGET (DAY OFF) HUMP-YARD PARKS AT SORTING
STATIONS. G. Telia. “Problems of Applied Mechanics”. Tbilisi, 2004, ¹ 1 (14),
p. 80-85, (Russ.).
Are investigated and the rational circuits target of hump-yard of parks, and also sphere of their application are offered; the technique on account of number and productivity pull-out of ways in target (day off) neck of hump-yard of park is developed. 2 ill. Bibl. 4. Russ.
DEFINITION THE CAPACITY OF SORTING COMPLEXES AND ITS INDIVIDUAL ELEMENTS FOR VARIOUS EXPLOITATION CONDITIONS. L. Bokuchava. “Problems of Applied Mechanics”. Tbilisi, 2004, ¹ 1 (14), p. 86-89, (Russ.).
The definition methods of capacity of sorting complexes and its individual
elements are offered. With the aid of original formula are made calculations,
on which base is drawn up the diagram, determining the possibilities of marshaling
yard processing abilities in various conditions. 2 ill. Bibl. 2. Russ.
DYNAMICS OF DEEPENED STRUCTURES IN GEOLOGICALLY DIFFERENT ENGINEER CONDITIONS. V. Japaridze. “Problems of Applied Mechanics”. Tbilisi, 2004,
¹ 1 (14), p. 90-99, (Russ.).
In work the deepened structure as a deformed resilient-plastic system schematized in form of the two-mass of three-mass system, loaded by a indulatory ground’s pressures on a cover and a foundation. It is made the dynamics calculation of the structure. 7 ill. Bibl. 2. Russ.
MEANS OF WORKING OUT METHODS OF FIGHT FOR PURITY OF THE AIR.
N. Gheladze. “Problems of Applied Mechanics”. Tbilisi, 2004, ¹ 1 (14), p. 100-102, (Russ.).
It is made the classification of the methods of fight for a purity of the air, against the formation of nitric oxides when burning the organic fuels and oils and given the evaluate its effectiveness. The results given in the table. It is chose the method of a work out of a technology of suppression of the NOx’s formation. Bibl. 5. Russ.
THE INFLUENCE OF MOTION PART PROFILE OF HILL ON MARSHALLING YARD PROCESSING
ABILITY. A. Koreli. “Problems of Applied Mechanics”. Tbilisi, 2004, ¹ 1 (14),
p. 103-106, (Russ.).
The analysis of various factors influence on processing ability of sorting hill is carried out for South countries, including Georgia, specifically, using the parallel lowering regime of train from the hill. In the article is given analysis of various factors influence on processing ability of sorting hill, specifically, using the parallel lowering regime of train from the hill, also is offering regulation possibilities of motion part profile of hill for rise marshalling yard productivity working. 2 ill. Bibl. 4. Russ.