Vol 18, No 3 (2017)

Articles
CAD OF TURBINE PROFILE TYPE A3K7 NACA BY THE METHOD OF NONLINEAR TRANSFORMATION
Vinogradov L.V., Mamaev V.K., Oschepkov P.P.
Abstract

The paper presents the results of designing a turbine profile type A3K7 NACA using CAD, which realizes the method of nonlinear transformation. Girst transformation was used by the authors. All calculations and graphical representations were made in the computer algebra system Mathcad. For the calculation and graphical representations the middle line, defined by coordinates, is approximated with two linear segments in the regions of the leading and tailing edges with specified angles and three nonlinear segments in the form of second order Bezier curves. The coordinates of the matching points of neighbor sections are calculated using an iterative method with an optimization of the correlation index. The coordinate of the bending point was found using the condition of equality to zero of the second derivative of the interpolative contour. The coordinates of the junction point of the leading edge are determined in the paper as ab arc and a series of points of the contour, approximated by a second order Bezier curve. After determining the first and last point of the second order Bezier curve, the coordinated of the middle point on the intersection of tangential lines that start at the first and last point of the curve. After the approximation of three sections with second order Bezier curves the integral function of the blade back (convex side of the contour) of the profile A3K7 considering the leading and tailing edges are made as arcs.

RUDN Journal of Engineering Researches. 2017;18(3):299-307
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MIRROR SPACE ANTENNA REFLECTOR MADE OF COMPOSITE MATERIALS CONSTRUCTIVE APPEARANCE DETERMINATION
Novikov A.D., Prosuntsov P.V., Reznik S.V.
Abstract

This article describes search studies of optimal design and technological solutions for the ultralight mirror space antenna reflectors made of CFRP. The studies included finite element modeling of the reflector temperature and stress-strain state in the geostationary orbit. As a result of comparing the results of a number reflector variants modeling, a design was chosen, with minimal values of temperature displacements and linear density

RUDN Journal of Engineering Researches. 2017;18(3):308-317
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EXPERIENCE OF APPLICATION OF POLYMERIC PELLICLE MATERIALS N CONSTRUCTION OF CRIOGENIC STARTING BLOCK «КРБ-12»
Nekhorosikh G.E.
Abstract

The results of design, fabrication, experimental testing and introduction of technological processes of manufacture of pipelines complex shapes from polymeric film materials, which was used when creating a cryogenic upper stage “12КРБ» is presented.

RUDN Journal of Engineering Researches. 2017;18(3):318-324
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MODELLING OF HEAT EXCHANGE IN FLEXIBLE CONDUCTORS OF HALOGEN LAMPS OF THERMAL TEST FACILITY
Baldzhiev R.S., Alekseyev A.A., Prosuntsov P.V.
Abstract

Current work is dedicated to the evaluation of the possibility of safety use of serial halogen lamps for high power radiating heating test facilities with active cooling of the bulbs. Complex modeling of electrical and thermal processes occurring at various (standard, forced and extreme) facility operation modes has been carried out. The temperature values in the individual elements of the lamp supply system are obtained. A variant of the booth design, which provides the cooling of flexible wires and bus lines by the air flow, is rational from the point of safety and ensuring long-term uninterrupted operation view.

RUDN Journal of Engineering Researches. 2017;18(3):325-337
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MATHEMATICAL MODELING OF DYNAMICS MOVEMENT OF A PISTON SKIRT IN THE CYLINDER OF THE INTERNAL COMBUSTION ENGINE
Smirnov S.V., Makarov A.R., Vorobyev A.A.
Abstract

There examined method theoretical research of sectional piston skirt hydrodynamic lubrication, and influence of piston and connection rod groups options on it.

RUDN Journal of Engineering Researches. 2017;18(3):338-344
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NANOSATELLITE BODY COMPOSITE MATERIAL THERMAL CONDUCTIVITY DETERMINATION COMPUTATIONAL AND THEORETICAL METHOD
Reznik S.V., Prosuntsov P.V., Denisov O.V., Petrov N.M., Lee V.
Abstract

In this paper, we present a technique for determining the thermal conductivity of an anisotropic composite material (CM) of a body of nanosatellite on a contact heating installation. A description is given of the technique of a thermal physics experiment with CM samples in the form of thin-walled plates, which were parts of the body of nanosatellite.

RUDN Journal of Engineering Researches. 2017;18(3):345-352
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SULFIDE ORE MINERALIZATION OF THE URANIUM-MOLYBDENUM-RHENIUM BRIKETNO-ZHELTUKHINSKOE DEPOSIT (MOSCOW BASIN)
Kaylachakov P.E.
Abstract

The article presents new data on mineralogy of the ores of U-Mo-Re Briketno-Zheltukhinskoe Deposit hosted in terrigenous rocks. Sulfides, mainly presented by pyrite, have been studied. Previously unknown mineral forms, such as Se-pyrite, iron selenide - dzharkenite and chalcopyrite, have been found.

RUDN Journal of Engineering Researches. 2017;18(3):353-360
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DEVELOPMENT OF METHOD FOR DETERMINING AND CORRECTING PARAMETERS OF THE WORKING ORBIT OF THE EARTH REMOTE SENSING SATELLITE
Mikhaylovskiy K.V., Gorodetsky M.A.
Abstract

A technique for the complex analysis of the characteristics of orbits used for space vehicles for remote sensing of the Earth (RSE), taking into account their trajectory, is proposed. The results of mathematical modeling of the operating conditions of such devices are presented. The technique is tested taking into account the input parameters of the orbit of the BelKA spacecraft. The technique will be useful in choosing of complex orbital characteristics for RSE spacecraft at the stage of technical proposals.

RUDN Journal of Engineering Researches. 2017;18(3):361-372
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ANALYSIS OF PERFORMANCE A SCANNING ANALOG-DIGITAL CONVERTER OF THE “TIME-IMPULSE” TYPE WITH A COARSELY-ACCURATE SYSTEM OF A COUNTING
Hodorovsky A.Z., Nazarov A.V.
Abstract

Dynamic properties of ADC time-impulse type with a coarse-fine reference system are analyzed. The concept of the acceleration coefficient of the transformation process is introduced, and its dependence on the number of discharges and the number of conversion steps is investigated. Recommendations for the choice of the parameters of the transducers are given. A technique is proposed for the optimal distribution of discharges over the conversion stages, which ensures the best dynamic properties of coarse-accurate converters. It is shown that the implementation of coarse-precision methods provides multiple acceleration of the conversion. The fastest rate increase observed in the transition from a single-stage to a two-step transformation.

RUDN Journal of Engineering Researches. 2017;18(3):373-381
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APPENDIX TO THE CLASSIFICATION OF RURAL SETTLEMENTS IN THE REPUBLIC OF SERBIA ACCORDING TO THEIR URBAN-MORPHOLOGICAL CHARACTERISTICS
Dopudja D.
Abstract

The given article has a goal to present a method of built structure spatial analysis from urban-morphological aspect, through an analytical overview of Serbian village settlements, and to propose its’ update, in accordance with changes that took place in last few decades.

RUDN Journal of Engineering Researches. 2017;18(3):382-390
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FLOTATION PROCESSES DURING THE CONSTRUCTION WORKINGS-TANKS BY UNDERGROUND DISSOLUTION OF ROCK SALT WITH A HIGH CONTENT OF GAS
Malyukov V.P., Starovoytova Y.I.
Abstract

Analyzed experimental and field studies of flotation processes in the construction of mines-tanks for backup of hydrocarbons by the method of underground dissolution of rock salt with a high content of gas.

RUDN Journal of Engineering Researches. 2017;18(3):391-397
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