Известия Нац. академии наук Беларуси. Сер. физ.-техн. наук, 2002, No.4 / Издания академии / Научные журналы
Известия Нац. академии наук Беларуси. Сер. физ.-техн. наук, 2002, No.4
|Известия Национальной академии наук Беларуси
СЕРИЯ ФИЗИКО-ТЕХНИЧЕСКИХ НАУК
Издатель: Беларуская навука, Минск, Республика Беларусь
Номер 4, 2002
Prokopchuk N. R., Tolkach O. Ya.
The method of lifetime estimation of tubes from polymeric materials.
Summary: The developed technique differs by response, low material consumption, broad propagation of underlying hardware. Using of the given method allows to reduce terms, to save materials and power resources at creation of new technologies and competitive production, and to execute incoming testing of raw material, certification of off-the shelf production from polyolefines and to reveal disturbance of technological modes of processing.
Grechikhin L. I., Ivashchenko S. A.
Interaction energy of particles at vacuum-plasma coatings creation. pp. 11--17
Summary: The physical model of particles interaction at vacuum-plasma coatings formation is considered. The technique for binding energy calculation in solids is suggested, taking into account the change of effective nucleus charge.
Based on calculations carried out the principles of hardening vacuum-plasma coatings design with specified physico-mechanical operating performances are suggested.
Belotserkovsky M. A., Kukareko V. A., Sukhotsky P. G., Kalinovsky D. M.
Influence of spraying media content on the structure and properties of gas-thermal wire coatings. pp. 18--23
Summary: Conditions and modes of gas-flame spraying of wire materials influence on structure of coatings and amount of oxides. These conditions can cause creations of abnormally high concentrations of equalized remaining austenite.
Chichko O. I., Sobolev V. F., Anisovich G. A., Chichko A. N.
On the computer analysis of stresses and strains of 3-d part, subjected to hear treatment. pp. 24--29
Summary: The integral characteristics of thermal stressed detail state based on the thermal elasticity (relative and displacement deformations, normal and tangent stresses) and on the share of detail elements are offered. The computer calculations of three-dimensional deformations and stresses of detail "shaft" with changing space dimensions are given on the basis of equilibrium and thermal conductivity equations.
НАДЕЖНОСТЬ И ДОЛГОВЕЧНОСТЬ МАШИН
Gorbatsevich M. I., Dzyun V. A., Kunovsky E. B., Nikolaenok S. L.
Acoustically active surfaces localization of automobile constructions using intensimetry technique.
Summary: The reduction of heavy truck drive axle noise has been obtained by using sound intensity technique for sound active surfaces localization.
Zakharik Yu. M., Rukteshel O. S., Zakharik A. M.
Circuit analysis of automobile clutch control systems. pp. 34--38
Summary: Analysis of systems of hydro-mechanical, pneumo-mechanical, hydro-pneumatic, electro-pneumatic, electro-hydraulic types showed the advantage of electro-pneumatic, electro-hydraulic systems.
Yashcheritsyn P. I., Rakomsin A. P., Filonov I. P., Kojuro L. M.
The increase of products competitiveness by technological methods.
Summary: The applying of an electromagnetic surfacing with plastically deformed surface allows to increase a wear resistance of parts in 2.5 times and fatigue resistance up to 1.4 times as contrasted to hardened steel 45.
Levdansky A. E., Vilkotsky A. I., Levdansky E. I.
Investigation of a multistage flowing mill at a selective decomposition of sylvinite ores. pp. 43--47
Summary: The article is devoted to exploration of a grinding operation of sylvinite ore in a multistage flowing attritor. The outcomes of experimental explorations of the above-stated attritor are presented. The potential possibilities of applying of an attritor are reviewed during preliminary opening-up ores of sylvinite to floatation.
Gafo Yu. N., Kashitsin L. P., Shiroky I. V., Sosnovsky A. V.
Powder material meltback at heat transfer with a part, heated with electric current. pp. 48--50
Summary: New method of building-up welding wear resistant coats on machine parts surface has been developed. The technology for realization of this method on practice is presented. The formula, defining association between time of process of a building-up welding and parameters of an obtained coverage is obtained. The characteristics of received coats as well as advantages of this method are shown.
РАДИОЭЛЕКТРОНИКА И ПРИБОРОСТРОЕНИЕ
Narkun Z. M.
Electric capacitance of a system of round and elliptic shells, placed inside a round shell.
Summary: A method is proposed for calculating the electrical capacitance of a system of round and elliptic shells and shells in the form of plate placed inside a round shell. The method is based on precise constructing the electrostatic field potential. An algorithm for deriving approximate formulae is presented. Some particular cases are considered.
Bordusov S. V.
Optimum pressure choice in processes of microwave plasmachemical treating of materials. pp. 59--61
Summary: The procedure of the speeded up definition of optimum pressure for processes of a microwave plasmachemical removing of materials from a solid surface in requirements of a rough vacuum is designed.
The procedure based on definition of value of plasma forming gas pressure at which the underload delay time of beginning a microwave breakdown in gas in relation to the beginning of generation of ultra high frequency radiation in requirements of pulsatory mode of a magnetron operation is observed. The experiments have shown that at such pressure the peak rate of plasmachemical material removing from a solid surface is ensured.
Chernobai I. A.
Industrial ultrasonic gas flowmeter-counter with extended range of measurable flow. pp. 62--71
Summary: The operational algorithms of interference-free ultrasonic method of the flow velocity measuring have been described and on its base the development of the industrial ultrasonic gas flowmeter-counter with extended range of the measurable flow has been presented. The principles of the functioning of the developed ultrasonic flowmeter-counter have been explained with assistance of the clock diagram.
Chemobai I. A.
Performance, algorithms and of the metrological tests of the industrial ultrasonic gas flowmeter-counter. pp. 72--77
Summary: The most substantial engineering performances, operational algorithms of the measured information processing and results of the metrology tests of the industrial ultrasonic gas flowmeter-counter with extended range of the measurable flow have been presented. The reached level of the instrumental error is negligible low, however it is necessary to proceed to the multi-channel measuring scheme for the reaching of the 0.5 accuracy class.
Pashkevich A. P., Kozhevnikav M. M.
Neural network stability for motion synthesis problem of robotic manipulators.
Summary: The paper deals with the stability of a topologically ordered NRG neural network, which is applied to robotic manipulator motion synthesis. The sufficient conditions of existence and uniqueness of the neural network equilibrium as well as the conditions of its stability are proposed. These conditions have been successfully applied to design of the motion control programs for industrial robotic-manipulators.
Samoshkin M. A.
The automation of parallel-consequent reading of graphical data and hierarchical systems efficiency estimation. pp. 83--90
Summary: The ways of automatic parallel-sequential reading of a graphic information with selection of a critical step of a grid and aperture of a scanning beam are built. The analysis of existing methods of an estimation of the characteristics of hierarchic systems is made. The capability of an estimation of the hierarchic system benchmarks is shown depending on the characteristics ob its components.
Matskevich A. N., Nudnov E. V.
The synthesis technique of an identification of robust servo system with stochastic structure. pp. 91--98
Summary: The technique of synthesis of the identifier of generalized perturbations robust with random structure of the servo-mechanism operating in conditions unmonitored interval of non-stationary change of parameters of the system and the characteristics of external perturbations is surveyed.
Konchak V. S., Kolesnikovich A. N.
The adjustment method of control signal parameters at loading mode simulation at single-component workbench.
Summary: The method of constructing of an iterative control procedure for research of mechanical constructions on the single-component stand is proposed. The coordinates of each consequent point of controlled parameter are calculated by results of two previous samples. The method will be utilized at workbench test of the objects having nonlinear natures.
Markov V. A., Plekhov I. M., Shishlo B. M.
Separation of viscous and crystallizing frops from gas (vapor). pp. 103--105
Summary: The design of separation device for division of drops of viscous and crystallizing solutions as well as the results of experimental researches of studying influences of mode and geometrical parameters on efficiency of separation of phases and hydraulic resistance of a construction are resulted in the article.
Migoun N. P., Gnusin A. B.
The influence of penetrant testing temperature regime on sensitivity threshold. pp. 106--113
Summary: The problem of temperature effect of heated parts at two stages of penetrant testing (penetrant and developer application) upon method sensitivity is considered. The analytical expressions for determination the limit depth of capillary penetration, optimal depth of diffusion impregnation of cylindrical defects and threshold sensitivity with allowance for parts heating are obtained. It is shown, that two kinds of thermal effect (both at the stage of penetrant application and further heating of inspected parts during a development process.) result in reaching the optimal values in terms of sensitivity threshold and duration of penetration stage.
ТЕПЛОФИЗИКА, ТЕПЛОЭНЕРГЕТИКА, ТЕПЛОМАССООБМЕН
Vasiliev L. L., Zhuravlyov A. S., Ovsyannik A. V., Novikov M. N., Vasiliev L. L. Jr.
Heat transfer at liquefied propane boiling in capillary porous structures.
Summary: Heat transfer process at propane pool boiling on single horizontal tubes with porous coating and in metal ceramic structures of heat exchanger evaporators with channels for vapour evacuation was investigated. Porous coatings were applied by electric arc spraying (stainless steel) or sintering of metal powder particles (copper), structures of evaporator with steam exhaust channels were produced by hydrothermal synthesis technology of aluminium oxide ceramic.
Experiments were carried out at the heat flux ranges from 102 to 105 W/m2. The influence of porous coating parameters on heat transfer intensity was studied. The results of research show that an application of metal porous sprayed or sintered copper powder covering allows one to increase significantly the heat transfer intensity for propane boiling as compared with a smooth surface.
Ceramic oxide aluminium Аl2О3 porous structures made by hydrothermal synthesis method can be considered as an alternative to another kinds of wicks. The results obtained can be applied in the chemical industry, refrigerator engineering, electronics, etc.
Нил Николаевич Дорожкин (К 75-летию со дня рождения). C. 120--121
для чтения статьи
A.V. Luikov Heat and Mass Transfer Institute of The National Academy of Sciences of Belarus is 50 years old. pp. 122--123.
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Разработана и поддерживается Николаем Н. Костюковичем. Последнее обновление: 2 декабря 2006 г.
Создана при участии Игнатия И. Корсака
Копирайт © 2003-2006 Национальная академии наук Беларуси
Копирайт © 2002 Издательство "Беларуская навука"