№4(21), 2005

SUMMARIES

Numerical simulation for the gear diagnostics using joint time-frequency Wigner-Ville Distribution. T.B. Geramitcioski, L.R. Trajcevski. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 9-16, (Engl.).

This work paper used date from a numerical simulation to develop and evaluate the fault classification algorithm. The fact that the Wigner-Ville Distribution (WVD) can represent the energy of a gear vibration signal was used for the gear diagnostics. A novel method for gear damage detection using a new gear fault detection parameter based on the WVD and is called NP4 detection parameter. This parameter is calculated from a time-domain power signal derived from the WVD. The novelty of the NP4 parameter is in the application of the previously defined statistical parameter called kurtosis and its interpretation for gear fault detection. The sensitivity of this gear fault detection parameter to the gear damage is demonstrated on the numerical simulation example. Also, in this paper is developed software in Matlab for solved the Wigner-Ville Distribution and NP4 detection parameter. 4 ill. Bibl. 6. Engl., summ. in Russ.

The no_x emission calculation for marine diesel engine using operation parameters. T. Borkowski. “Problems of Mechanics”. Tbilisi, 2005, № 4(21),
pp. 17-24, (Engl.).

Continued environment legislative trend generates a desire for marine engine real time exhaust emission data, with a view to their use in a feedback control strategy in conjunction with other reduction techniques. An experimental study is conducted to investigate the use of phenomenological multi-zone models to predict NO_x emission, based on marine diesel engine operation parameters. 5 ill. Bibl. 7. Engl., summ. in Russ.

The cylinder pressure analysis of marine diesel engine. P. Kowalak. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 25-31, (Engl.).

Some pressure transducers cause difficulties with determination of the absolute cylinder pressure value. A base pressure has to be defined in the scaling algorithm. To determinate the characteristic difference two sets of the cylinder pressure samples, during scavenging process collected, and statistical analysis conducted. The results shows advantage some scavenging periods and more valuable for scaling. 2 ill. Bibl. 3. Engl.; summ. in Russ.

THE PROPOSAL OF OIL-FIRED BOILER TEST. J. Myśków. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 32-36, (Engl.).

The paper shows the proposal of oil-fired boiler test according to the existing rules-energetic parameters (mainly – maximum load capacity of boiler) and the toxic compounds in the exhaust gases. The test should be carried out during sea trials. 5 ill. Bibl 2. Engl., summ. in Russ.

On the problem of intellectualization of railway sensors.
K. Kutateladze, N. Davitashvili, C. Barkan, N. Mgebrishvili, T. Nadiradze, O. Chudakova,
M. Tatanashvili. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 37-44, (Engl.).

Comparative analysis of railway sensors used in the systems of signalization, centralization and block systems of the railway transport, is carried out. On the basis of intellectualization of railway sensors, for the purpose of elimination of their shortcomings, a new multifunctional system, ensuring railway traffic safety, is offered and analyzed. With the use of intellectual sensors, a device ensuring counting of rolling stock’s axles and units, determining of the speed of movement and degree of wheel pairs’ wear with great precision and identifying of the moving units, is elaborated. 3 ill. Bibl. 10. Engl.; summ. in Russ.

Determination of contact line of mated surfaces of space transmittion in gears. R. Gogaladze, S. Barbakadze, M. Bibiluri, L. Gogoladze. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 45-48, (Russ.).

There are elaborated special methods of determination of surrounded cogged surfaces. Contact line of cogged surfaces and touch surface are defined. A goal of researches is conducting of examination of space cogged transmittion according to touching trensformations and their following practical realization. 2 ill. Bibl. 5. Russ.

Methods of catalysis coating of fuel injection elements of diesel engines. O. Klyus. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 49-53, (Russ.).

The рaper presents methods of ion implantation, anti wear and electric-spark ignition in catalysis coating on parts of fuel injection elements of diesel engines. 4 ill. Bibl. 2. Russ.

OPTIMIZATION OF PRECISION TOOLS FOR ASSEMBLING ELECTRICAL SCHEMES. M. Amiridze. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 54-58, (Russ.).

The work deals with optimization of geometric parameters of micro welding tools discussing the tools, materials and working parts used in designing an integral micro system. It considers the urgency of the issue, the goal of the work and main objectives as well as the ways to achieve it. The paper contains the key conclusions derived from the research. The result of this work are based on the experiments and the theoretical research carried out by the author. 3 ill. Bibl. 6. Russ.

AUTOMATED PROJECTION OF PIECESE BODY’S MILLING MANUFACTURING ON MACHINE CENTRES. T. Gegechkori, L. Tediashvili. “Problems of Mechanics”. Tbilisi, 2005,
№ 4(21), pp. 59-62, (Engl.).

The structural scheme of the automatized projection system of body pieces’s manufacturing process on machine centres and the means of her realization are given. 3 ill. Bibl. 4 Russ.

To the question of determination of basic power parameters for cutting process on a special planer. O. Rukhadze, M. Shvangiradze. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 63-68, (Russ.).

In this paper, the brief survey of power parameters in the process of cutting on a special planer by means of a wide tool at the trimming of ingots both in continuous metallurgical cycle, i.e. in hot state, and in cold state, in given. The question of creating of a new type cutting tool is studied, which is designed and produced in the laboratory of the Department of engineering tools of Georgian Technical University. 4 ill. Bibl. 3. Russ.

FOR THE ISSUE OF TREATMENT THE FLAT SURFACES BY ROLLED DISKS. T. Gerkeuli, Z. Gerkeuli. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 69-72, (Russ.).

In this article there is discussed the issue about possibility and expediency of treatment the flat surfaces by rolled disks in lightened condition. There is showed principal scheme of treatment. Directions of powers acting in deformation hearth are defined by carried out analysis. Calculation formula of supplying power during treatment is made. 2 ill. Bibl. 2. Russ.

The Theory of the moving wheels considering enological Characteristics of the soil. R. Makharoblidze, I. Lagvilava, J. Dzirkvadze. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 73-78, (Russ.).

The calculating formulas of the size of the wheels and forces of resistance are been gotten for the using of combing classical theory of moving wheels and enological methods. The estimation is drawn about influence of permanent relaxation of the soil and speed of taking wheels of these indicators. 1 ill. Bibl. 5. Russ.

Water steam as plasma forming environment. Z. Sabashvili,
D. Tavkhelidze, Z. Mchedlishvili. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 79-82, (Russ.).

The offered article is devoted to the problem of examination of physical and chemical processes arising in plasmatrons during usage of water steam as plasma forming gas. Here, based on the original scheme of plasmatron, water is submitted directly in to the field of an arch. The specified scheme can be successfully used as thermo-generators of different purpose. 4 ill. Bibl. 4. Russ.

About a numerical solution of the modified problem of Dirichlet, for a case of the broken contours. M. Kublashvili, Z. Kapanadze. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 83-87, (Russ.).

The modified problem of Dirichlet, for a case of the broken Liapunov’s contours which solution is reduced to a solution of a singular integral equation of the first sort is investigated. Circuits of a high degree of an exactitude of a numerical solution of a task in view are developed. In paper the realized numerical experiments are reduced also. Bibl. 5. Russ.

Exact-solution of the problem of nonstationary convective heat transfer in a flat channel. V. Tsutskiridze. “Problems of Mechanics”. Tbilisi, 2005,
№ 4(21), pp. 88-91, (Russ.).

Investigation has been made of the nonstationary convective heat transfer problem for laminar steady-state viscous incompressible fluid flow in a flat channel. In the case of a parabolic – type velocity profile an exact solution of the problem of found in form of the Fourier – integral expansion in an actial coordinate and series expansion by degenerate hypergeometric functions. Bibl. 9. Russ.

MATHEMATICAL MODELLING OF MUD EARTH FLOWS. A. Phrangishvili,
T. Obgadze, Z. Tcveraidze, I. Mathiashvili. “Problems of Mechanics”. Tbilisi, 2005, № 4(21),
pp. 92-94, (Russ.).

In work on the basis of a method of averaging Voinich-Sianojentski the mathematical model of a mud earth flow, as biphasic continuous environment of the second order is under construction. Adequacy of the constructed mathematical model is checked on experimental data Begnold, Savage, Tevzadze and Xerxeulidze. In work results of comparisons of theoretical calculations with experimental data are resulted. Bibl. 10. Russ.

MATHEMATICAL MODELLING OF AVALANCHE STREAMS AND CALCULATION OF DEFINING PARAMETERS WITHIN THE LIMITS OF RETURN VARIATIONAL STATEMENT KUPRADZE-BREBBIA. A. Phrangishvili, T. Obgadze, Z. Tсveraidze, I. Matiashvili. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 95-100, (Russ.).

In work on the basis of a method of averaging Voinich-Sianojentski. The mathematical model of a biphasic liquid describing current of avalanche streams is under construction. On the basis of return variation statement Kupradze-Brebbia and with use of method RO - functions Obgadze-Gabrichidze, the algorithm of calculation of problems, flows of bodies of the complex geometrical form a biphasic stream of a liquid is under construction. Bibl. 12. Russ.

On the numerical solution of dirichlet problem in the case of unknown open boundary curve. Z. Kapanadze, O Kvachadze, T. Chankotadze, M. Kublashvili. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 101-105, (Russ.).

In this paper we considered the solution of dirichlet problem when the equation of integration curve is unknown and it is given only by group/ The algorithm of high order exactness for numerical solution is suggested. The corresponding numerical experiments are given. 1 ill. Bibl. 6. Russ.

Nonsteady teat exchange during laminar liqud flow in a rouns pipe conscdering friction heat. V. Tsutskiridze. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 106-109, (Russ.).

Friction heat been studied for its effect on nonsteady heat exchange during laminar liquid flow in a round pipe. 2 ill. Bibl. 8. Russ.

Selection of the parameters of aerodynamic suspension devices.
R. Zukakishvili. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 110-114, (Russ.).

In this paper, the possibility of decreasing the moment of friction in supports of suspension devices at use of bearings with autocompensation is examined. 4 ill. Bibl. 4. Russ.

A NEW DIRECTION IN THE VIBROPNEUMATIC TECHNIC. G. Eradze, M. Jikia. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 115-118, (Russ.).

In article it is considered problems of the wrong scientific approach to a question of reduction of a vibrating background of manual pneumotools. In the proof to this the pre-production model of the manual pneumoshock tool twice reducing vibration a background is made and tested. For founders new generation of a design pneumatic instrument is offered to take into account scientific experience of authors. 1 ill. Bibl. 4. Russ.

CREEPING DEVELOPMENT EMPIRICAL LAWS IN POLYMERIC FIBROUS COMPOSITE MATERIALS. A. Dumbadze, J. Kanchaveli. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 119-125, (Russ.).

The most reliability of exponential empirical dependence as compared with power dependence is proved to describe complete full stretch deformation for considered polymeric fibrous composite materials P.F.C.M. in elastic stress and low temperatures Т=20ºC conditions. Relative errors reduction ways are offered. The result of researches allows to determine, precisely enough, laws of development of residual deformations and movings in working designs, and also to use them in calculations. Bibl. 6. Russ.

DIAGNOSTICS OF PARAMETERS OF THE CARS RATED SCHEMES AT STEPPED DISTURBANCES. B. Bandzeladze, V. Tsitadze. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 126-131, (Russ.).

Diagnostics of parameters are shown on the model of the car’s hanger bracket. It is determined, that the method of Laplace transformation permits to use broad spectrum of piece-linear functions as external disturbances. These functions are given in suitable tables which represent operational calculations. 1 ill. Bibl. 3. Russ.

NEW CONSTUCTIVE SCHEMAS OF TEMPORARY ERACTABLE BRIDGES, QUICKLY DEPLOYABLE IN EXTREME CONDITIONS. E. Medzmariashvili, N. Tsignadze,
G. Bedukhadze. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 132-136, (Russ.).

Structural schemes of rapidly deployable eractable bridges with various types of underway basis and span constructions were worked up-to-date engineering solution. The design drawings of eractable metal bridge’s set with falcate moduls - KM -01T were created. It’s modular elements for short bridge crossing were made in manufacture conditions, and factory tested on the proving ground and in field environment. With consideration of accumulated expirience and outcomes of conducted tests the bridge’s set KM -02T was worked up and produced and successfully tested in natural conditions. 6 ill. Bibl. 2. Russ.

Method of compulsion of crushing apron and fibrous-optical light-leader on surface of construction for definition of tensely-deformed state. M. Manjavidze, A. Natroshvili, T. Nareklishvili. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 137-141, (Russ.).

It is work out the method of the compulsion of a crushing apron and construction of the fibrous-optical light-leader. It is formed the model for the analysis of the tensely-formed state. 3 ill. Bibl. 2. Russ.

ANALYSIS OF CIRCULAR LINING WITH CONSIDERATION OF ELASTIC AND RHEOLOGICAL EFFECTS OF ROCK MASS AND STRUCTURE TECHNOLOGIES.
G. Datukishvili, Z. Kviriashvili. “Problems of Mechanics”. Tbilisi, 2005, № 4(21), pp. 142-147, (Russ.).

The methods of analysis of cast in-situ concrete lining of circular outline is developed considering the technology of tunnel construction and rock creep by substitution of integral time operators with the apparatus of approximated time functions. 1 ill. Bibl. 8. Russ.