Известия Нац. академии наук Беларуси. Сер. физ.-техн. наук, 1998, No.3
/ Издания академии / Научные журналы
Известия Нац. академии наук Беларуси. Сер. физ.-техн. наук, 1998, No.3
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Известия Национальной академии наук Беларуси
СЕРИЯ ФИЗИКО-ТЕХНИЧЕСКИХ НАУКИздатель: Беларуская навука, Минск, Республика Беларусь |
Номер 3, 1998
СОДЕРЖАНИЕ
МАТЕРИАЛОВЕДЕНИЕ
Lomov S.V., Harvud R., Dymovskii A.S., Gordienko A.I.
Mathematical modeling of slanting impact on a fabric barrier. pp. 3--8
Summary: A model for mathematical modeling of oblique ballistic interaction of a rigid projectile and a woven textile multilayered target is presented. It uses the finite difference description of the target deformation. The ultimate deformation criteria for yarn rupture is employed; the difference of yarn strength in a woven structure and in free state is accounted to. The Lagrangian approach is used; the finite difference net undergoes a transformation when a projectile slips on the target surface. The comparison with an experimental data is given.
Matusevich Yu.I., Matusevich V.Yu., Krul L.P.
Polyethylene of low density as glue-melt for thermoglue interlayer fabrics. pp. 9--14
Summary: A possibility has been studied to obtain a powder with a fraction ratio closed to that of the imported powder Schaettifix 1820 from the home produced granulated low density polyethylene using cryoengineering. The powder obtained has been shown to be useful as an adhesive covering to produce interlayer fabrics for textile industry.
Matusevich A.S. †, Makarova Zh.E.
Rolling of metal composite materials. pp. 15--19
Summary: Transversally-isotropic sample having additive properties along the fibers was used for strain-stress analysis at the rolling. The theoretical dependencies obtained allow to simulate the composites rolling process.
Yes'man R.I., L'vovskaya O.R.
The analysis of process of interaction between casting and metal form. pp. 20--22
Summary: Thermodeformational (thermostrain) interaction between casting and metal mould has been investigated. Mathematical models have been developed, algorithms of solutions have been realized on PC.
Petyushik E.E., Zagaigora I.G.
The stress-deformed state of elastic two-layer envelope during pressing processes. pp. 23--27
Summary: Non-linear plane axisymmetrical problem calculation of stress-deformed state of elastic two-layer envelope using at powder pressing process has been solved. It is shown that power expenditure on resilient deformation of elastic envelope is no more 5% from pressing pressure. Volume material deformation of envelope causes additional expenditure of energy at pressing.
НАДЕЖНОСТЬ И ДОЛГОВЕЧНОСТЬ МАШИН
Boiko L.I., Goman A.M., Rakova N.L.
Dynamic interaction of oscillating working parts of machine with a source of energy of the limited capacity. pp. 28--36.
Summary: The dynamic model of drive with elastic transmission mechanism is considered. An oscillating processes in such drives are described by the system of non-linear equations. The method of successive approximation is used for its solution. The employment of energy recuperator in a drive with oscillating motion of working parts gives the possibility to improve significantly the dynamic capacities of a drive and to receive them almost the same as a drive with rotation motion of working parts.
ТЕХНОЛОГИЯ МАШИНОСТРОЕНИЯ
Yashcheritsyn P.I., Rakomsin A.P., Sergeev L.E., Sidorenko M.I., Moiseenko P.V., Lebedev V.Ya.
Magnetic-abrasive processing of sharp facets and burrs. pp. 37--40
Summary: It is established that a method of magnetic-abrasive machining can be used for removal of burrs and rounding the facets of parts. The method parameters and processing conditions are presented. It use is most suitable for processing parts with a great difference in diameter sizes such as gears and spline shafts.
Dvornik A.P.
Investigation of dynamic characteristics of pick-up cutter-loader. pp. 41--45
Summary: The result of experimental investigation have been discussed of cutting regime effect on dynamic characteristics of pick-up cutter-loader operation. The results are used to compute actuating mechanism drives.
Pashkevich M.F., Pashkevich V.M., Mrochek Zh.A., Kozhuro L.M.
Methods of calculation and technological opportunities of friction driver units. pp. 46--52
Summary: Friction driver units face surfaces of cylindrical parts for transmission of a torque are used rarely than driver dogs in spite of their obvious advantages. It depends on limited experimental data concerning their technological potential as well as unsatisfactory methods of calculation. It is stated in this article a clarified methods of power calculation of the friction driver units of face type and methods of estimating the conditions of cutting, admissible by means of these very units under different types of machining. Mathematical formulas for calculation of a coefficient of friction have been obtained on the basis of experimental investigations. Utilization of these formulas provides high accuracy of the power calculation of the friction driver units.
Ustinovich D.F., Yashcheritsyn P.I.
Opportunity of high-speed magnetic processing. pp. 53--57.
Summary: The suggestion is made of the hypothesis concerning the possibility and efficiency of high-speed magnetic processing and the ways leading to its implementation are developed. The results of the hypothesis experimental testing are discusses.
Belitskii A.V.
A machine-tool for a bilateral finning of flat finned elements of heat exchangers . pp. 58--60
Summary: To obtain finning of high productivity and quality as well as providing flat finned heat exchanging elements of a considerable length a machine-tool for a bilateral finning has been used. Two synchronized rotating faceplates with cutters and feed drive make it possible to obtain stable and continuous billets feed to the cutting zone.
Klimovich F.F., Fedortsev R.V., Filonov I.P., Kozeruk A.S.
Investigation of the laws of bilateral forming of precision spherical surfaces. pp. 61--64
Summary: The description of the method of lenses bilateral forming at finishing operations is presented. Mathematical model is designed and the research calculation results of forming regularities of precision spherical surfaces according to the offered method are presented. The results of the research calculation correlate with the experimental data.
Gurchenko P.S.
Superficial thermal hardening of gear wheels with application of induction heating. pp. 65--74
Summary: Our technology and equipment of non-deformation hardening of surface of gears are remarkable for high temperature and high speed of heating, for no heat-treatment's deformations and high productivity, for low prices and ecological cleanliness. New technology of hardening is secure reaching of hardness for gears from any kind of steel. And now Minsk Automobile Plant harded the gears of transmission by our technology. Under the hardening of gears with 229 mm in diameter and 51 tooths the productivity of one mounting is composed of 25 gears at hour. Our tests determined that gears from cheap steel 40KH), which were harded by our technology doesn't yield to ordinary steels (18KHGT and 20KHN3A) which were saturated by nitrogen and carbon.
РАДИОЭЛЕКТРОНИКА И ПРИБОРОСТРОЕНИЕ
Novitskii O.A., Demchenko A.I.
Calculation of magnetic systems of magnetogalvanic sensors on the basis of Hall transformers. pp. 75--78
Summary: Technique of calculate of magnetic topography of concrete magnetic system of magnetogalvanic sensor is described here. This method based on particular features of magnetic material formed the system.
Bel'ko V.M., Rai K.S.
Semi-Marcovian model of functioning of spare elements to complex radioelectronic systems. pp. 79--83
Summary: Is developed semi-Marcovian model of functioning of spare elements for radioelectronic means. The formula for account of probability of stay semi-Marcovian process in a limiting condition is received. Results of account on the computer under the received formula are submitted. Results of accounts show, that the characteristics of semi-Marcovian process much depend on a kind of distribution law of emergency deliveries time at identical arithmetic mean.
ТЕХНИЧЕСКАЯ КИБЕРНЕТИКА
Kuleshov A.Ya., Samoshkin M.A.
Automatic capture of halftone images on the basis of photoelectric transformers and modeling of main parameters of input means. pp. 84--92
Summary: The method of automatic capture of halftone images are developed based on photoelectric transformers. Computer modeling of image detector with matrix photoreceiver is implemented and optical signal via optical-electronic tract is investigated. The original technical solutions are considered and a choice of main parameters of input means is explored.
Vysotskii M.S., Pet'ko V.I., Kukonin V.E., Kruchinskii V.V.
Investigation of the phenomenon of frequency substitution and its use for the spectral analysis of signals over Nyquist frequency. pp. 93--99
Summary: Phenomen of frequency substitution in spectral analysis that allow to establish modification mechanism of phase spectrum onto real frequencies is investigated. Method of signal spectrum analysis over Nyquist frequency and samples confirmed this method are proposed.
Rakovich A.G., Svirskii D.N., Kuchinskii S.P.
Modeling of level-by-level form-building in compact laser industrial systems. I. Errors of form-building. pp. 100--102
Summary: The products of the complex form made on technology of level-by-level synthesis have an error in the form of a surface due to footstep derivations. In the article the models allowing to calculate this error and to select an axis of synthesis ensuring least error are represented.
Sadykhov R.Kh., Vershok D.A.
Algorithm of informative features extraction on the basis of the Radon transform in the system of hand-written symbols recognition. pp. 103--107
Summary: The effective algorithm of informative features extraction in a system of handwritten arabic numerals recognition is offered. The algorithm based on the Radon transform allows to obtain informative features which have a form of projection profiles. Besides, the presented informative features are invariant to rotation, shift and scaling transformations. The high recognition rate of the recognition system is confirmed by the experimental results.
Chernyak A.A.
Acyclic monotone graphs: domination and reliability. pp. 108--114
Summary: The problem of computing domination is proved to be NP-hard even restricted to acyclic monotone graphs with the number of cutsets (pathsets) quadratically depending on the graph dimension. The similar problem for acyclic monotone graphs of the fixed degree is shown to be polynomially solvable. It is also proved that the problem of computing reliability is NP-hard even restricted to the class of dc-trivial monotone graph of degree 2 in which the number of cutsets (pathsets) linearly depends on the graph dimension.
МЕХАНИКА
Gladyshev M.T., Sokolskii A.Yu.
Movement of a land-slide. pp. 115--122
Summary: This article deals with analytical and numerical research of one-dimension movement of the land-slide. As a result of this research the problem of one-dimension movement of the land-slide along the flat slope has been solved and the movement scheme of the land-slides has been worked out: the latter gives the possibility to predict its dynamics, the distance of casts and the volume of accumulations. As an example the slide of land towards the road's given.
ТЕПЛОФИЗИКА, ТЕПЛОЭНЕРГЕТИКА, ТЕПЛОМАССООБМЕН
Kolenchits O.A., Minchenkova L.P.
Correction of experimental data on thermal conductivity of nitrogen at high temperatures. pp. 123--130
Summary: The review of literature data on thermal conductivity of nitrogen at atmosphere pressure in wide temperature range is presented. The comparison of these data, the analysis of their discrepancy and correction of the experimental results obtained by shock tube method in the temperature range 1000--6000 K has been made.
ЯДЕРНАЯ ЭНЕРГЕТИКА
Ipatov A.P., Kerko P.F., Pavlyukovich P.A., Rytvinskaya Ye.V., Kiselev S.V., Mosevitskii I.S., Kharlamov A.G., Pavlov G.M.
High-temperature facility for measurement of kinematic viscosity of molten corium. pp. 131--133
Summary: The experimental high temperature facility has been designed, developed and built to examine kinematic viscosity of reactor core melts. The working parameters of the facility are as follows: temperatures -- up to 2750 °C, environment -- vacuum and inert gas, automation treatment of data. Experimental investigations of viscosity of molten corium (78 % w. UO2 22% w. ZrO2) have bean carried out.
АННОТАЦИИ ДЕПОНИРОВАННЫХ СТАТЕЙ
Matyuk V.F., Strelyukhin A.V.
Features of distribution of a normal component of field residual magnetization of flat products at their local magnetization by pulses with different duration of forward and back fronts. p. 134.
Sadykhov R.Kh., Yadlovskii A.N.
Algorithms of construction of wavelet transformations in problems of image compression. p. 134
Dorodeiko V.G., Rubanik V.V.(Jr.)
Titanic nickelide. Ways of reception, property, application in medicine. p. 135
Sadykhov R.Kh., Kuleshova E.I.
Methods of identification of the binary images on the basis of the device of indistinct logic. p. 135
Ibragimov V.A., Chernyavskaya S.V.
On one class of exact solutions of second boundary value problem of the nonlinear theory of elasticity for a plane from harmonic material weakened by an aperture. p. 135.
Lomakina L.V.
To the theory of optimization on the initial data of discrete systems. p. 136
Rodchenko V.G.
Method of informative features classification at construction of system of recognition. p. 136
Gutsalyuk A.I.
Methodology of formalization of the decisions on construction of one of social institutes of the state. p. 137
Gutsalyuk A.I.
Complex adaptive model of an estimation of number of one of social institutes of the state. p. 137
УЧЕНЫЕ БЕЛАРУСИ
Войтович А. П., Витязь П. А., Волотовский И. Д. и др.
Борис Андреевич Коловандин. С. 138--139
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Разработана и поддерживается Николаем Н. Костюковичем. Последнее обновление: 10 мая 2008 г.
Создана при участии Игнатия И. Корсака
Копирайт © 1998-2008 Национальная академии наук Беларуси
Копирайт © 1998 Издательство "Беларуская навука"
