Vol 18, No 1 (2017)

Architecture and civil engineering
CONSTRUCTIVE DECISIONS OF STEEL BEAMS MADE OF THIN-WALLED COLD-FORMED PROFILES
Frolovskaya A.V., Shambina S.L., Petrova J.M.
Abstract

The article considers the worked out optimal variant of a constructive design for a steel covering beam having a compound cross-section made of thin-walled cold-formed sections. Numerical studies have been carried out for various options of beams taking into account reduction of cross-section. Tests were made of the created an optimal variant of a beam in full size.

RUDN Journal of Engineering Researches. 2017;18(1):7-13
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RESTORING BASIS POINTS AT DEFORMATION MONITORING
Tereshin A.A., Neguritsa D.L., Kirkov A.Y.
Abstract

This article discusses one of the possible methods of restoring the strong points of observation stations at deformation monitoring. It is shown that can be used to restore the coordinates of thereference frames so-called “stable point”. Such points are characterized in that their coordinates in the interval between two measurements do not change over the range of accuracy of measurement adopted.

RUDN Journal of Engineering Researches. 2017;18(1):14-19
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METHODOLOGY FOR STRENGTH ANALYSIS OF NORMAL CROSS-SECTIONS OF REINFORCED CONCRETE HYDRAULIC STRUCTURES STRENGTHENED WITH CARBON COMPOSITE MATERIALS
Rubin O.D., Lisichkin S.E., Frolov K.E.
Abstract

The way to strengthen concrete structures in civil engineering by adding external reinforcement using carbon fiber composites is widely spreading in recent years. A method for calculating the strength of reinforced concrete in hydro technical constructions with reinforcing by carbon fiber composite materials was invented with the aim to justify the solutions of strengthening concrete structures. It was taken into consideration that the characteristic features of mass reinforced concrete structure with sand operating loads which including backpressure of water in the cracks and in opened construction joints. It has evolved the relations for calculation of strength in normal cross section of bending reinforced concrete member of hydro technical constructions which strengthening with external reinforcement by carbon fiber.

RUDN Journal of Engineering Researches. 2017;18(1):20-28
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REINFORCED GYPSUM-POLYSTYRENE CONCRETE MIX AS THE THERMAL INSULATION OF PIPELINES IN THE HEATING STATION
Svintsov A.P., Gusamov M.T., Shumilin E.E.
Abstract

Results comparison of efficiency of thermal protection of basalt fibers and gypsum polystyrene concrete. The thermal efficiency of the piping of the heating system depends on the thermal insulation. Effective heat protection to create the conditions to reduce losses of heat for heating of buildings.Thermal efficiency of protection depends on the physical properties of the material and the thickness of the insulation layer. The optimum thickness of thermal insulation is an important element in the rational use of materials and thermal energy.Thermal protection must ensure the surface of the insulation temperature of not more than 45 °C if the coolant temperature is over 100 °C. Thermal protection must ensure the surface of the insulation temperature of not more than 35 °C if the coolant has a temperature below 100 °C.Heat insulating material based on gypsum polystyrene concrete created at the RUDN University. Crushed or granulated polystyrene can be used for the production of this material. The material has a density of 300 kg/m3. Strength under axial compression is an average of 0.6 MPa. Coefficient of thermal conductivity equal to an average of 0,074 W/(m °C).Calculation and comparison of the effectiveness and cost of the thermal protection of various materials are presented. This material is more than six times less thermal insulation made of basalt fiber.The use of plaster polystyrene for thermal insulation of pipelines and equipment of calorific points to successfully solve the problem of decrease in losses of heat at operation of heating systems.

RUDN Journal of Engineering Researches. 2017;18(1):29-39
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EFFICIENCY USE HIGHFITTING WITHOUT CLUTCH WITH CONCRETE IN THE MONOLITHIC BEAMLESS FLOORS
Kuznetsov V.S., Polehina G.E., Shaposhnikova Y.A.
Abstract

Calculation of the strength of beamless floors without reinforcement with concrete adhesion can be refined by taking into account the work of the rope as part of the cabling system. This paper considers the limits of applicability of high-strength reinforcement making full use of its strength in order to achieve the most efficient designs.

RUDN Journal of Engineering Researches. 2017;18(1):40-47
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MODELING OF TECHNICAL COATED FABRICS FOR TENSILE STRUCTURES
Kustov A.A.
Abstract

In this article, the laboratory tests executed with a research objective of mechanical properties of technical coated fabric are described. Experiments included uniaxial tensile tests in the warp and weft directions. For measurement of displacements and deformations on a surface of a sample the method of digital images correlation has been used. The numerical simulation of material has been constructed and calculated to simulate the experiments. Good convergence between results of laboratory and numerical researches is shown

RUDN Journal of Engineering Researches. 2017;18(1):48-57
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Innovative software engineering research
THE NONLINEAR BENDING OF SIMPLY SUPPORTED ELASTIC PLATE
Mathieu G., Tyekolo D., Belay S.
Abstract

In this article, assumptions in Classical Plate Theory (CPT) are explained; followed by concepts involved in Finite Element discretization for elastic Plate bending in CPT. Computer implementation aspects and Numerical Results of CPT elements are also included for analyzing nonlinear bending of simply supported elastic plates.

RUDN Journal of Engineering Researches. 2017;18(1):58-69
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UMBRELLA TYPE SURFACE FOR A SPORTS CENTER
Kozyreva A.A., Rynkovskaya M.I., Tupikova E.M.
Abstract

The practical examples of umbrella-type shells and domes, methods of their genesis are given in the article, the prospects for future application are considered. Two innovational umbrella type surfaces of six equal elements, proposed for adaptation by Strength of materials department of PFUR, their application illustrated by the sports center roof.

RUDN Journal of Engineering Researches. 2017;18(1):70-78
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Mechanical engineering and power-plant
OSCILLATIONS MULTILAYERED COMPOSITE RODS FROM MATERIALS IN THE FIELD OF CENTRIFUGAL FORCES
Nurimbetov A.U., Dudchenko A.A.
Abstract

We study the vibrations of multilayer composite rod. In order to influence the definition-tion features multilayered rods, clarify the roles and forms orthotropy-layers fluctuations regarded rod of arbitrary cross section and a compressor blade Nye. The numerical results obtained for ratios compared with the results calculated by ANSYS program.

RUDN Journal of Engineering Researches. 2017;18(1):79-90
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ANALYSIS CONDITIONS FOR RELIABLE ATTACH OF WORKPIECES DURING LATHE MACHINING ON THE MASHINES WITH NUMERICAL SOFT-WARE CONTROL
Belousov Y.V.
Abstract

In the article the conditions are properly secured work pieces when turning on CNC machines. The mathematical expressions that guarantee no damage while fixing in the chuck work pieces of ductile and brittle materials. Expressions allow determining the minimum length of the fastening pieces in the cartridge for these materials, as well as for the calculation of permissible cutting forces. It is shown that by adjusting the processing conditions may prevent damage to the work piece surfaces at the impossibility of changing their length in the fixing chuck.

RUDN Journal of Engineering Researches. 2017;18(1):91-96
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ARTIFICIAL NEURAL NETWORK APPROACH TO TRAFFIC FLOW CONTROL
Kazaryan D.E., Mihalyev V.A., Sofronova E.A.
Abstract
A problem of optimal urban traffic flows control is considered. A mathematical model of control by the traffic lights at intersections using the controlled networks theory is given. It is a system of nonlinear finite-differential equations. To present a large scale road networks the model contains the connection matrices that describe interactions between input and output roads in subnetworks. The traffic flow control is performed by the coordination of active phases of traffic lights. A control goal is to minimize the difference between the total input flow and total output flow for all subnetworks. In this paper, a neural network approach for urban traffic road network parameters adjustment is presented. A simulation is conducted under a microscopic traffic simulation software CTraf. Results demonstrate that neural network reinforcement training obtain good parameters of the network model.
RUDN Journal of Engineering Researches. 2017;18(1):97-106
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COMPUTER MODELING OF MUTUAL DIFFUSION OF TWO-COMPONENT MEDIUM
Nazarov A.V.
Abstract

The article presents the results of computer simulation of the process of mutual diffusion of two- component medium. We developed and tested an algorithm simulation of diffusion in a two coextensive medium by cellular automaton and algorithm modeling diffusion neravnoobemnoy environment by direct Monte Carlo simulation. The simulation determined the dependence of the diffusion length of the number of particles participating in the process, and plotted the ratio of components of the medium influence the length of the diffusion process, which may be used to estimate the parameters of the real practical diffusion process.

RUDN Journal of Engineering Researches. 2017;18(1):107-114
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SYNTHESIS OF CONTROL FOR GROUP OF AUTONOMOUS ROBOTS WITH PHASE CONSTRAINTS BY MULTI-LAYER NETWORK OPERATOR WITH PRIORITIES
Diveev A.I., Shmalko E.Y.
Abstract
We consider a control system synthesis problem for the small group of autonomous robots with state constraints and several possible initial conditions. The main control task for team of robots is to move the robots out of some current position to the specified terminal position without colliding with each other. Typically, the control synthesis for the group of robots consists of two phases: stabilization of the robot with respect to some point of the state space and the design of optimal trajectories. The trajectories must ensure that the robots move from the initial states to certain states of the terminal set without collisions. To avoid collision, the control system uses priorities based, for example, on a distance between the robot and its end position. Since there are phase constraints, ordinary stabilization of robots cannot ensure the safe movement of robots from different initial conditions to the terminal positions. The paper presents our new approach to solving the stabilization problem with phase constraints by multi-layer network operator. We show an example of synthesis of control for the group of four robots.
RUDN Journal of Engineering Researches. 2017;18(1):115-124
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METHOD OF BINARY ANALYTIC PROGRAMMING TO LOOK FOR OPTIMAL MATHEMATICAL EXPRESSION
Diveev A.I., Lomakova E.M.
Abstract
In the known methods of symbolical regression by search of the solution with the help of a genetic algorithm, there is a problem of crossover. Genetic programming performs a crossover only in certainpoints. Grammatical evolution often corrects a code after a crossover. Other methods of symbolical regression use excess elements in a code for elimination of this shortcoming. The work presents a new method of symbolic regression on base of binary computing trees. The method has no problems with a crossover. Method use a coding in the form of a set of integer numbers like analytic programming. The work describes the new method and some examples of codding for mathematical expressions.
RUDN Journal of Engineering Researches. 2017;18(1):125-134
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Innovative use of mineral resources
MODELING OF UNDERGROUND MINE WORKINGS IN CONSOLIDATING THE SOIL-ARRAY
Velichko D.V., Dronov A.N., Tereshin A.A.
Abstract

The article deals with the analysis of computer modeling of stability of underground workings in the ground array strengthen cement mixtures. Based criteria by which the results of the computer simulation, the optimum strength of reinforced soil-array. It is shown that this technology can be used to strengthen in the sinking of underground mine workings in the loose soil.

RUDN Journal of Engineering Researches. 2017;18(1):144-148
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BENTONITE CLAYS FROM 10TH KHUTOR DEPOSITE: FEATURES OF GENESIS, COMPOSITION AND ADSORPTION PROPERTIES
Belousov P.E., Krupskaya V.V., Zakusin S.V., Zhigarev V.V.
Abstract

The article is dedicated to the study of mineral composition and genesis of Desiatiy Khutor deposit of bentonite clays located in the Republic of Khakasia. The mineral composition of natural samples and fraction < 0.5 mm was studied in details by X-ray diffraction. On the basis of the geological structure,tectonic and mineragenous zoning data, the deposit was designated to a particular genetic type of deposits, lying among coal-bearing rocks. Promising areas for bentonite exploration were highlighted within this bentonite- bearing province.

RUDN Journal of Engineering Researches. 2017;18(1):135-143
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DIVERSIFICATION OF THE MINING PRODUCTION
Japarov V.H.
Abstract

The urgency of the problem of the survival of the mining industry due to the fact that they are in the new economic policy without government involvement and investment can ensure economic prosperity as the mining and processing of the remaining mineral reserves uneconomic.The purpose of work consists in justification of diversification of the technology field development on the basis of involvement in the production of non-conforming raw materials and processing his unconventional methods of leaching and mechanical activation.Methods. The possibility of extraction of metals from sub-standard raw material is confirmed by field and laboratory experiments, including industrial.Results. Made a critical analysis of the contribution of scientists Ossetia to the development of scientific and technical progress of mining technology. The conditions of recovery of the mining and ore - processing production in the mining region on the example of the Republic of North Ossetia- Alania. For the deposits of Sadonsky ore province and their counterparts recommended combined scheme design, including elements of technology with the laying of the cavities hardening mixtures, underground and heap leaching of poor and off-balance ores and the leaching of tailings with activation in a disintegrator.In conclusion, it is concluded that the conversion of the mining and processing industries is an instrument of economic and social problems of depressed mountain region.

RUDN Journal of Engineering Researches. 2017;18(1):149-156
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Reviews
RETsENZIYaI vanov V.N., Romanova V.A. Konstruirovanie poverkhnostey prostranstvennykh konstruktsiy. Vizualizatsiya poverkhnosteyv sistemakh MathCad i AutoCad: monografiya. M.: ASV, 2016. 410 s.
Myskova O.V.
Abstract
RUDN Journal of Engineering Researches. 2017;18(1):157-159
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