Proc. of the Natl. Academy of Sciences of Belarus, Ser. Phys.-Eng. Sci., 2007, No.1
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Proc. of the Natl. Academy of Sciences of Belarus, Ser. Phys.-Eng. Sci., 2007, No.1
||Proceedings of the National Academy of Sciences of Belarus
(Vestsi Natsiyanalnai Akademii Navuk Belarusi)
SERIES OF PHYSICAL-ENGINEERING SCIENCES
Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus
Number 1, 2007
MATERIALS ENGINEERING, METALLURGY
Klubovich V. V., Timoshpolskiy V. I., Zhdanovich G. M., Isaevich L. A., Tamila V. A.
Force variables determination of drift-rolling pierced billet process. pp. 5--8
Summary: Force variables of drift-rolling pierced billet process have been determined. Equations for determination of axis strengthening on drift-pin (full drift-pin strengthening) and axis average normal strengthening in mandrel have been obtained.
Kuzmar I. I., Kushner L. K., Khmyl A. A.
The mathematical modelling of electro-diffusion processes at electrodeposition of nickel--ultradispersed diamonds coating from Watts' electrolyte. pp. 9--16
Summary: The mathematical model of the mass transport processes at electrodeposition of nickel from Watts' electrolyte with nano particles of ultradispersed diamonds are reviewed. The distribution of ionic forms in the bulk solution and in the pre-cathode layer has been calculated. The current-potential relationship and limiting currents have been estimated as by theoretically so experimentally which one are adequate among themselves.
Tolstoy A. V.
On the role of cellular structures in forming properties of Cu-Be deformed alloys. pp. 17--22
Summary: The mechanical properties of the Cu-Be deformed alloys and regularity of X-ray diffraction by such structures were investigated. The real submicroscopic structure of quenched and deformed Cu-Be alloys was discovered based on the analysis of X-ray diffractional pictures from positions of the M. A. Kryvoglaz theory and results of TEM researches. The quantitative estimations of dependence of the basic mechanical properties of the alloy on a density of dislocations were made.
MECHANICAL ENGINEERING AND MECHANICS
Vysotski M. S., Doubovik D. A.
Quantitative estimation of the steerability of wheel vehicles. pp. 23--28
Summary: Method of a quantitative estimation of the steerability of wheel vehicles, taking into account a deviation of the actual curvature of a movement trajectory from the curvature of a movement trajectory of the wheel vehicle with neutral turnability, is developed. The method allows in a complex to estimate as size of wheel vehicle reaction on control influences of a driver, as speed of this reaction, and also to carry out optimization of constructive and operational parameters influencing on the steerability on any development stage of the vehicle. Examples of realization of the offered method by calculation and experiment methods are brought.
Zhuravkov M. A., Pleskachevsky Yu. M.
Management of deformation and destruction of deformable rigid bodies by influence of waves of deformation. pp. 29--35
Summary: The method of controlled influence on deformation processes in deformable rigid bodies by the directed external influence on bodies and creations of waves of deformations of irregular structure in them is proposed. The efficiency of a method is shown on examples of model tasks solution. The prospects of the approach at creation of applied technologies in various areas of the modern mechanics are described.
Grudanov V. Ya., Brench A. A., Philippovich M. O.
Influence of geometrical parameters of knives on cutting quality. pp. 36--40
Summary: The main ways of improvement of working parts of machines for fine pounding of meat raw materials are defined. Mathematical equations of dependence of specific power-consuming of cutting process rheological and structural-mechanical properties of minced meat on modes and construction particularities of a cutter are obtained. New cutting knives are designed on the basis of the dependencies obtained and their advantages are experimentally proven compared to serial produced ones.
Bosakov S. V., Guenfoud S., Bouhemame N., Djebala A.
Dynamical analysis of rectangular plate located on elastic foundation of Winkler's type. pp. 41--49
Summary: The treatment of the problem related to the dynamical analysis of the beams and plates resting on an elastic foundation is essential, because currently this type of constructions is largely used. However the calculation of this type of plates, in particular on the dynamics, is related to the great mathematical difficulties and leads often to the unrealizable computational processes. Considering these circumstances, the calculation of the plates resting on elastic foundation completion has not been made until now. This fact determines the need for specifying the existing calculation's methods of this type of structures or proposing other more effective methods. Therefore we propose an approach for resolving the problem related to the determination simultaneously of natural frequencies, the forms of natural fluctuations and the responce of the rectangular plate, resting on elastic foundation typing of Winkler, for the dynamical load. The proposed approach is based on the Gemochkin's method, in which the plate is discretized in a number of identical elements of rectangular form and in the centre of each element a stiffening joint is placed, through which the contact of plate with the foundation is achieved. The damping, the inertia of the foundation and friction between the plate and the foundation are neglected. The proposed approach is applied to a plate, discretized in 9,16 and 25 masses whose results obtained are satisfactory.
Malyutin V. B., Ustsinovich D. F.
Modelling of a surface microgeometry at treating with polymer-abrasive fibre composites. pp. 50--54
Summary: The method is suggested for mathematical description of microgeometry of rough surface the formation of which results from processing with polymer-abrasive fibre composites. The set of spheres has been chosen as a model describing the processing surface and that to be processed. The numerical examples are given for calculating the parameters of curved bearing surface.
Serenkov P. S., Romanchack V. M., Solomakho V. L.
Conception of data acquisition and analysis under the condition of real operation of industrial enterprise quality management system. pp. 55--60
Summary: The algorithm of information modeling as a basis of mechanism of acquisition and analysis of manufacturing processes quality data of a typical industrial enterprise was defined. Requirements and constraints to the model of process quality indexes as function of influencing factors in real process operation were determined. Universal method of approximation of passively registered quality data as an algorithm of approximation by superposition of wavelets in the form of delta-shaped functions was offered.
Kulak M. I., Medyak D. M., Starchenko O. P.
Regularities of pressure influence of print contact on changes of raster dots size. pp. 61--67
Summary: Process of mechanical gain of raster dot in offset technology in a press is considered. The basic scheme of mechanical gain and calculation procedure for a gain with the account of heterogeneity of porous space and paper surface is presented. The calculation of heterogeneity is carried out by means of the fractal theory. Efficiency of key parameters influence of technological process of offset printing on size of raster dot gain is estimated.
POWER ENGINEERING, HEAT AND MASS TRANSFER
Levdansky V. V., Dragun V. L., Smolik J., Zdimal V., Moravec P.
Role of surface processes and size effects in formation of nanoscale particles at deposition from gas phase. pp. 68--74
Summary: The paper deals with the theoretical study of the influence of size effects, surface phenomena and electromagnetic radiation on formation of nanoparticles. It is shown that dependence of the condensation coefficient on the size of aerosol particle, the presence of the adsorbable foreign gas in the system and excitation of gas molecules in the field of resonance (e. g., laser) radiation can substantially affect phase transitions on the surface of nanoscale aerosol particles. The problems of formation of composite nanoparticles and deposition of polymolecular films onto nanoparticles are discussed.
Levchenko S. A., Yakushav A. P., Nikitsin S. N.
Application of the method of integrated resource planning for the analysis of energy efficient technologies implementation in housing-and-municipal sector. pp. 75--80
Summary: The using of the method of integrated resource planning (IRP) and software package LEAP, based on this method, for the analysis of energy efficient technologies implementation in housing-and-municipal sector is shown.
Tyutyuma V. D.
On one particularity of viscous barotropic liquid flow in a straight pipe. pp. 81--85
Summary: It is exemplified on a viscous barotropic liquid flow in a straight pipe that account of elastic volume deformation of the medium cause fundamentally new regularities of viscous flows behaviour. Significant difference of the movement of viscous barotropic medium from the flow of viscous incompressible liquid consists in the fact that if a pressure gradient exists a stabilized rectilinear-parallel laminar movement like Poiseuille flow is impossible for it.
INFORMATION TECHNOLOGIES AND SYSTEMS
Buloychik V. M., Skripko D. M.
Solution to a traffic problem on digital map with use of artificial neural networks. pp. 86--92
Summary: The approach to use of neural networks for the solution to a problem of route searching on a digital map is described. Authors suggest using for this purpose a dynamic neural network with the neurons having complex structure and function of activation.
Pet'ko V. L, Kukonin A. G, Kukonin V. E.
A data transmission method with the lines of electrical power network within a narrow frequency range. pp. 93--95
Summary: The frequency transmission method of data with lines of a power electrical network applying fast Fourier transforms is offered. The efficiency of the method in monitoring systems for a condition of remote objects is shown.
Nesenchuk A. A., Osipyan A. I.
Investigation of robust stability of forth order control systems. pp. 96--104
Summary: Investigation of the root locus portraits for control systems with interval parameter variation has been carried out. The dependence of the root locus portraits configuration from the variable parameters intervals limit values has been defined and main types of the systems root locus portraits have been determined. The method for calculation of the parameter intervals, ensuring robust stability of the initially unstable system has been developed.
RADIOELECTRONICS AND INSTRUMENT MAKING
Zatsepin N. N., Zatsepin E. N.
Some aspects of demagnetization field. Part 1. Determination of true point coefficients of demagnetization along longitudinal axes of flat two-dimensional sample. pp. 105--109
Summary: The problem of determination of true (internal) point demagnetization coefficient of a sample is solved analytically. It is shown that the coefficient is proportional to a demagnetization-magnetization parameter, which depends on size and magnetic properties of the sample.
The particularities of topology of demagnetization coefficients are shown and the results are explained.
Aksenchyk A. V., Kurayev A. A.
Reflex klystrongs and monotrones for centimeter and millimeter wavelength range. pp. 110--118
Summary: The optimization of the microwave generators based on reflex klystrons and monotrones is carried out. The space charge, sagging of fields in the non-grid gap of cavities, electrons relativism are take into account. Calculated designs with grid and non-grid gaps for various accelerating voltages and currents of an electron beam are carried out. It is shown, that the calculated electron efficiency of reflex klystrons can achieve 27, 23, 2,2% at frequencies 10, 50 and 1000 GHz accordinly. The efficiency of monotrones achieves 11, 10 and 1.3% at specified frequencies accordinly.
DIAGNOSTICS AND SAFETY OF TECHNICAL AND ENVIRONMENT SYSTEMS
Rubin I. E., Tarasenko V. V., Tverkovkin B. E., Dneprovskaya N. M.
Time-dependent neutronic calculation method of VVER reactors. pp. 119--121
Summary: A fast calculation space time diffusion method based on rough mesh approximation was developed in order to evaluate transient neutron behavior in light water reactor cores. The method is comparable with the computational codes employing the more precise approaches.
SCIENTISTS OF BELARUS
Nikolay Nikolaevich Zatsepin (On his 90th birthday). pp. 122--123
to read this article in Russian (Win1251)
Irina Aleksandrovna Trusova (On her anniversary). pp. 124--125
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