Factors that generate power supply voltage and current distribution in traction networks are considered. Determination methods of the current distribution in the substation area for double power supply sections of a traction network for transport route are provided. A calculation method of currents in...

This paper is devoted to the study of the energy characteristics of the traction power system of urban electric transport, the development of a methodology for evaluating currents distribution in traction networks and the development of progressive concepts of traction power supply systems. For the implementation...

The work presents the results of comparative chemical and thermal processing analysis of components at one of the small enterprises of the Central Black Earth Region and one of the plants in France. The modern examination equipment allows carrying out the metallographic studies more accurately, developing...

One of the possible fields of application of wet magnetic separation waste of ferruginous quartzite was considered in the paper. For Belgorod and neighbouring regions, the problem of this waste utilization is quite acute. The most effective specific surface of the filler, by which the averaging of grains...

The paper proposes the social potential of rural areas. It gives the comparison of the quality of the population life of different countries through the criterion of expenditures and consumption of home economics. It also compares the rates of introduction of residential houses and improvement of housing...

The transient processes, associated with the management process of drawing glass rods, are observed. To solve this problem, mathematical models are used; the zones, in which the glass rod (light guide) is formed, the actuator, including a motor, a transmission mechanism. These models allow us to determine...

Technological equipment in various industries uses an abrasive effect on the object being processed, and the continuity of the contact of the working organs with it is often disrupted. Sometimes such regime is maintained intentionally, that is, periodic contact of the treated object with the abrasive...

Nowadays, many countries of the world are witnessing the tendency of refocusing the building materials industry upon the types of concrete, whose distinguishing characteristic is the reduced consumption of portland cement. The studies aimed to develop effective composite binders and expand the raw materials...

Comparative analysis of various electric heating elements used for room heating is presented. Advantages of flat plasma-sprayed electrical heaters in terms of energetic and thermal parameters are shown. Dependencies of specific surface power and temperature distribution through heater substrate width...

In the article, the options of mines aeration by means of ejector fan installation are examined, as well as the principle of this installation functioning and its potential are shown. Basing on the investigations conducted and the functioning results received, the possibility of application of the ejector...

A number of issues arose due to the transfer of animal husbandry to the industrial basis. They are associated with high stocking density of animals in a limited space. They are primarily the high energy consumption for creation of optimal microclimate, the increase in the risk of spreading infections...

The article is devoted to synthesis of an optimal regulator of the process of recovery of the braking energy of trains using an AC traction electric drive. The optimality criteria, mathematical description of the system of energy recovery, suitable for the maximum principle of L. S. Pontryagin application,...

Major requirement to the design of oil and gas industry pipeline systems is the provision of their safety under actual operating conditions taking into account the actual technical properties of the used items. Experience shows that the actual operating conditions of pipeline system objects are characterized...

Paper presents the results of studying the features of recording acoustic emission waves recorded by fiber-optic sensors. Fiber-optic sensors are used as an elastic medium that receives acoustic emission waves. For this purpose, the optical fibers are embedded in the polymer composite material during...

One of the ways of solving the problem of organising transport and technological service of oil-and-gas production processes is considered in the paper. The authors propose analysing the operation of the system of transport servicing of electric power generation management, when extracting oil and gas,...

In the paper, the methodology of creating a rational system of providing special vehicles, operating in the oil-and-gas sector, with spare parts is presented. As a result of the study, the criteria of effectiveness of providing with spare parts were determined. The method of rational distribution of...

This article is devoted to the development of technical solutions and structures aimed at improving energy efficiency of solar plants in the regions with temperate continental climate through the adaptive control of coolant velocity. The main development stages of the adaptive control system and its...

The paper features the analysis of sustainability of Belgorod Region enterprises dealing with production of construction materials and building structures exemplified by five largest and well-known enterprises of this industry: JSC Melstrom, JSC Stroymaterialy, OJSCÿPlant ZhBK-1, OJSC Belgorodasbestotsement...

On the basis of a previously developed mathematical model of electromagnetic power transfer between phases, an investigation of effectiveness of the functioning of the arc steel furnace EAF-100 with coplanar construction of the secondary current lead in the modes of "short", "medium" and "long" arc discharges...

The article is devoted to the analysis of one of the most popular sections of scientometrics - research fronts, in the direction of industrial science. There are quite a large number of serious studies in the field of industry which are highly cited, which confirms their relevance and necessity for the...

To ensure trouble-free operation and lifetime of lithium-ion storage batteries (LISB) for spacecrafts, it is advisable to use bypass devices (BD) with a power element of a thermal drive made of smart material with shape memory effect (SME). The authors presented experimental results of the effect of...

The most important task at the present stage of the formation of modern society is the intensive development of the national economy on the basis of the latest achievements of science and technology. The building materials industry in the Russian Federation is one of the most energy-intensive industries....

Currently, development and implementation of new technologies has come to the fore in every field of industrial production. Interest to additive manufacturing grows in Russia and abroad, including application of such technologies in architecture and construction, allowing production of forms and structures...

The article reviews the problems, emerging while planning, managing and evaluating the efficiency of material flows of enterprises, identifies and justifies the necessity of using integrated platform of management on the basis of systems and process theories. Moreover, the article provides the conceptual...

The article examines the trends in the development of business processes regulation in Russian companies. At the present stage of the formation of a market economy in Russia, in the conditions of large-scale structural reorganization of the country's economy as a whole, the description and regulation...

A large number of regions are attractive for the application of renewable energy equipment, including those that are using the solar energy potential. But the volatile nature of the solar radiation flux requires specific forecasts and calculations of its intensity. Besides, installations under urban...

This paper considers the major factors influencing cement flowability and its conservation in humid environment with the presence of processing additives during grinding. It describes cement flowability quantitative measurement methods developed and introduced by the authors and implemented on the basis...

The article presents the structure of a subminiaturized eddy-current transducer (EST) of a transformer type with the exciting, measuring and compensation windings, which is based on the pyramid-shaped core providing the localization of the magnetic field on the area of 0.0025 mmý. It also presents the...

The paper presents practical aspects of experimental research and numerical modeling of stress-strain parameters of the proposed construction element - plastic tube concrete (PTC). The obtained experimental data indicating the loss of load-bearing capacity enabled one to perform finite element analysis...

Investigation results on specific erosion of copper tubular electrodes of the arc plasmatron for air heating are presented. The decisive influence of spatial stabilization of the arc discharge and current strength on the value of specific erosion is shown. The conditions of optimal erosion of electrodes...

The paper provides a brief summary of costs necessary to obtain nanosized magnesian powders when utilizing amorphous magnesite by-products. It also describes new methods accounting and allocation of common costs among products when processing and utilizing amorphous magnesite by-products in dynamic market...

The proposed mathematical models for the calculation of the temperature field and the process of nucleation and growth of a grain in the electrode material of a plasmatron allow conducting numerical simulation of various modes of operation of a hollow cathode and evaluating the change in the structure...

Adaptation of the technology for a 3D building printing system aimed at producing non-autoclaved aerated concrete allows solving a task of how to create wall structures with high thermal insulation properties without using other materials, and with the increase of molding devices' productivity due to...

By using the heat balance equation and a modified Fourier law's formula considering the relaxation of heat flow and temperature gradient, a model of the local non-equilibrium process of plate heating with ultrashort laser pulses, modelled by heat flow of time-variable second-class boundary conditions,...

Spent galvanic solutions are highly aggressive and contain substances, suitable for reuse. Regeneration of these solutions represents both an environmental and economic issue of actual problem. The efficiency of electrochemical regeneration chromate electrolyte of anodic oxidation was monitored. The...

The article considers development of the technology of recovering disturbed soils intended for nature protection purposes on the territory of Bovanenkovskiy oil, gas and condensate field of Yamal peninsula. In the course of operation, blend composition and consumption rates of seed material were selected,...

Equipment used at the enterprises implementing oil and gas technologies is potentially hazardous and should be of high degree of reliability. Reliability of equipment reduces the number of defects appearing during the operation process. One of hazardous and unpredictable defects is fracture. If there...

The paper is devoted to the effectiveness increase of monitoring the value of seam pressure when operating oil-producing wells. This problem is relevant for well operation when using subsurface measuring systems. In such cases, seam pressure is determined by recalculation of the dynamic level value,...

In this article the importance of using superconducting technologies in power industry together with SMART GRID, based on the analysis of program documents and scientific works, has been done, which will allow the maximum extent to solve its problems. The physical principles of contactless suspension...

The article is dedicated to the estimation of oil displacement efficiency. It is obligatory for the estimation of mineable reserves, feasibility study of oil recovery efficiency and control of the field development. The complexity of its laboratory determination is caused by the labor intensity and duration...

Traditional technologies of chitosan producing may negatively affect the main quality parameters of chitosan (molecular weight, the degree of deacetylation) due to hard alkali-acid treatment of raw materials. The authors propose an alternative technical approach. It involves the use of electrohydraulic...

The task of developing import-substituting technologies for processing and storage of products of goats lactation with relevant equipment should be solved by the following actual reasons: biochemical characteristics as the objects of food nanobiotechnology, the seasonal nature of production of these...

Tough climatic conditions of the North impose special requirements for mining machines operating in that area. The article analyzes failures of Komatsu D-375A and Komatsu D-375A5 to assess the effects of operating conditions on reliability of their components and systems. Statistical analysis is used...

Development of mineral fields requires use of various machines. In the North, truck operation goes hand in hand with failures. Statistical analysis identified the effect of ambient temperatures on operating efficiency of BelAZ-7540 dump trucks. It was established that the number of failures increases...

The article introduces simple regulations of simple method specifications, based on structural synthesis method, for controlled rectifiers of the single-phase alternating current development. It is proved that the structural synthesis method is useful in improvement of zone rectifiers' circuits and in...

This paper introduces prospects for further development of a single zone-phase rectifier, aimed to research and improve it. A new radial type circuit and its advantages are provided as well. Based on these studies, the ways of single-phase rectifiers power factor improvement are suggested. The ladder...

The opportunity of application of Stirling engine with non-conventional and renewable sources of energy was considered in the paper. The advantage of such use was demonstrated. The expression for the thermal efficiency of the Stirling engine was obtained. It was shown that the work per cycle is proportional...

The process of icebreaker interaction with the ice cover is described, the method of calculation of resistance during the motion of ships by continuous motion in smooth continuous ice is given. The semi-empirical method of calculating the ice resistance is divided into components and includes not only...

The study is directed to conclusion and approbation of the new defining relations that describe arousal and change of stress fields in isotropic material during crystallization, taking into account temperature strains and structural shrinkage. The statement of the crystallization problem and numerical...

The authors conducted a review of a number of pumps for pumping oil and oil products of a traditional cylindrical (radial) construction. Their critical analysis is presented in the paper. In addition, the shortcomings and advantages of the pump are described. The designs of axial centrifugal pumps were...

The method of calculation of intermediate diametrical sizes and allowances is considered in the article when designing the technology of manufacturing machine parts. This method makes it possible to ensure the quality of manufacturing machine parts by preliminarily determining the adjustment dimensions...

The paper considers the solution of the photogrammetric problem of measuring the planar objects dimensions with projective distortions that are characteristic for low-altitude photography. It is shown that a bird's eye view transformation technique allows estimating the area occupied by planar objects...

In isolated power systems for energy-intensive consumers with changing power consumption, there is a need to investigate how different operating and consumption modes influence the system parameter and quality of electricity. This issue is relevant for power systems, which include energy-intensive consumers...

To reduce losses in the zero conductor of three-phase alternating current networks, it is proposed to use a switching device made on the basis of semiconductor thyristors, in order to enable the single-phase consumer to be connected to the required phase of power supply in order to reduce asymmetry....

In the conditions of autonomous functioning of special equipment, there is a need to use its internal sources. This can be accomplished using a heat recovery system of the internal combustion engine. For this purpose, the authors suggest a heat accumulator. The mathematical modelling of the thermal state...

The article considers a wind-solar generator based on special electric machines for power supply of various objects. The subject of this article is a wind-solar generator intended for simultaneous conversion of solar energy (using a photoelectric converter) and wind into electrical energy according to...

The engine-separator of combined design is considered in the article. The subject of this article is temperature field investigation of the engine-separator with a combined design. The purpose of this paper is to review and analyze the application of an oil separation unit based on a separator engine...

The work proposes the model of turbulent transfer in a boundary layer, which reflects the influence of periodic control actions on turbulent transfer factors. It provides the opportunity of reasonable turbulent transfer management. The list of actions, which influence turbulent transfer intensity, is...

A method for studying the thermal state of turbomachine blades is presented. A numerical investigation method takes into account the phenomenon of gas-dynamic temperature stratification. The possibility of increasing the efficiency of cooling turbine blades due to the phenomenon of gas-dynamic temperature...

In the overall balance of oil reserves of Russia, high-paraffin oils (HWO) make up, by different estimations, from 55 to 75%. Asphalt-resinous and paraffin depositions (ARPD) are contained in the composition of oils in almost all oil-producing regions of the Russian Federation (RF). High content of paraffin...

This paper presents the methods of synthesis for speed systems control of induction motor drives, which in accordance with the principles of vector control are represented as a dynamic multi-input/multi-output object. Under the influence of uncontrolled signal and parametric disturbances, the synthesized...

Based on the concepts of local non-equilibrium thermodynamics, mathematical models for heat, mass and momentum transfer have been developed with space-time nonlocality taken into consideration. Derivation of transfer differential equations is based on taking into account both specific flows (of heat,...

The climatic pecularities of the Russian Federation territory that determine the duration of the heating season are considered. The number of operating heating sources of large, medium and low power is reflected. The equipment wear rate of the heating sources is defined. The emphasis is placed on the...

The article outlines the transition from analogue to digital protection for DC traction network, selection methods of protection and their settings. The first trial uses results, suggestions for further enhancements of adjusting methods, using monitoring and increasing the level of automation and mathematical...

The industrial powder waste from thermal power plants such as fly ash is used as asphalt or mineral filler due to its properties and dispersibility. However, the conflicting data on the fly ash usage are due to the different compositions, dispersibility, reaction capacity of the used fly ash. This paper...

The paper outlines different solutions to address the problem of progressive collapse when designing buildings and structures and proposes possible modes of progressive collapse of structural systems. It presents the requirements stipulated by regulatory documents for assessing progressive collapse of...

The paper describes the development of composite binders with low water demand, obtained by intergrinding Portland cement, Muroplast hyperplasticizer, and tailings of magnetic separation of jaspilites from the Kursk Magnetic Anomaly. The obtained composite binders possess high strength properties after...

The authors of the paper present the results of theoretical research of the pulsed operating mode of linear electric sieve mill of grain cleaning machine MVR-2 (SU - 0.1). It is shown that when using a linear electric drive in the grain cleaning machine in a pulsed mode, the productivity is increased...

The article aims to study the change of instantaneous values of differential current in power transformer protection circuits during magnetizing inrush when the unloaded transformer is connected to a power source and when a fault occurs in the protected area. Also, time behavior of the unbalance current...

The article describes a technique to calculate the reliability of a fixing element of a metal-polymer insert of a combined mold for casting products from thermoplastics. To do this, the stress-strain state of the metal-polymer fixing element is calculated by the force of ejection. The characteristics...

The article describes the technology of combined metal-metal-polymer molds to cast plastic products. The economic feasibility of this technology is confirmed by comparing the processing layouts to obtain a mold for the same product, machining and using a metal-polymer as a forming surface material. The...

The paper consideres the occurrence of fretting corrosion on nominally fixed surfaces of highly loaded parts of mining machines and mechanisms. The authors give examples of wear and damage of critical parts operating under fretting. The mechanisms of fretting corrosion when using wear-resistant coatings...

A technique for controlling the shape of the surface and the defects of the cutting tool by an optoelectronic system of the light field is proposed. The physical and information models of the optical-electronic light field recorder, the mathematical model of the edge of the cutting surface of the tap,...

The determination of the current technical resource of the electric transport system is an important characteristic that allows one to define not only the current reliability of the system, but also to predict it for the future. If the maintenance of electrical equipment is carried out to restore the...

The paper reviews the electric traction network analysis, the distinctive features of its functioning, innovative switching to digital protection, the first results of trial operation, proposals for further improvements, using the monitoring and level increase of the automation operating system of the...

The paper describes methods for setpoints setting of digital protections (terminals) in traction DC networks. A technique for their improvement and protection settings in a complete scheme is proposed. Besides, the main technical characteristics of digital protection and automation devices are listed....

Achievement of required indexes of diesels is impossible without processes improvement of fuel spraying and mixture formation. Modern diesel fuel equipment does not provide a demanded number of the above-mentioned processes fully. Quality improvement of the processes is a goal of the study. Constructions...

The relevance of the article is due to the need for wider use of the alternative fuels in internal combustion engines. Advantages of using fuels of vegetable origin as motor fuels are shown. Experimental research of diesel engine D-245.12S functioning on mixtures of diesel fuel and mustard oil of various...

The relevance of the article is due to the need for wider use of the alternative fuels in internal combustion engines. Advantages of using fuels of vegetable origin as motor fuels are shown. Experimental research of diesel engine D-245.12S functioning on mixtures of diesel fuel and mustard oil of various...

To study the effect of various types of magnetic field concentrators on the energy and thermal characteristics of the induction heating system of noncylindrical billets in the magnetic field of rotating permanent magnets, a numerical model was developed. The model allows solving the conjugate electromagnetic...

The dynamics of a heavy nonhomogeneous ellipsoid of rotation on a horizontal fixed plane with friction is analysed. It is assumed that the mass centre of the spheroid coincides with its geometric center and that the geometric axis of symmetry is the axis of dynamic symmetry. The frictional force is proportional...

During writing this work, the fuzzy controller with a double base of rules was studied; it was applied for the synthesis of the automated control system. A method for fuzzy controller adaptation has been developed. The adaptation allows the fuzzy controller to automatically compensate for parametric...

A method of eddy-current defectoscopy of graphite electrodes is considered in the article. Imitation modeling of electromagnetic processes was performed, and a device based on a microcontroller for monitoring the integrity of the graphite electrodes was developed. The device has electrotechnical characteristics...

Lithium-ion battery (LIB) technology further enabled the information revolution by powering smartphones and tablets, allowing an unprecedented performance of these devices against reasonable cost. Currently, this battery technology is on the verge of carrying the revolution in road transport and energy...

Reliability of the power system depends on coordination and coherence of continuous processes of production, transmission, distribution and consumption of electric energy. It is offered to consider a power supply system of Russia as a four-level hierarchical system due to the terms of uninterrupted operation...

Diffusion of individual xenon atoms in the bulk of UO2 nanocrystals with free surface is studied using the molecular dynamics approach. Two sets of the pair potentials of interaction of the Xe atom with uranium and oxygen ions are considered. For both sets, interstitial migration is observed, as well...

In this paper, the authors consider determination of the modes of heat treatment of gray cast iron parts that have been subjected to diffusion surface alloying. The type of hardening treatment under consideration makes it possible to obtain a layer of high-carbon steel on the surface of the cast iron...

Multifunctional studies have already proved the efficacy of nanotechnological solutions to be applied in the civil engineering. This is largely due to the tendency in the product quality increase in terms of the basic exploitation characteristics, as well as, the formation of end-products unique properties....

Pulsed electromagnetic machines of shock action based on new vibro-impact technologies are widely applied in industry. Such machine striker mechanical vibrations frequency is equal to or multiple of the frequency of the supply network. The research purpose is the impact energy increase while pulse linear...

The development of modern methods of analysis and synthesis of electromechanical systems, including the main structural link of which is an electromagnetic drive, causes an increased interest in the creation and improvement of mathematical models of machines and devices that most objectively reflect...

The article specifies measuring data of air parameters and their volume flow in the shafts and on the surface, collected in BKPRU-2 (Berezniki potash plant and mine 2) (®Uralkali¯ PJSC) in the normal operation mode, after shutdown of the main mine fan (MMF) and within several hours. As a result of the...

The aim of this paper is to study the structure formation in the composite powder material "copper- Ti3SiC2" and to study erosion-resistance of tool-electrode made from this material by EDM of metal alloys. The influence of Ti3SiC2 content on the properties (porosity, hardness, strength, electrical resistance,...

The structure of the predictive control system of the test facility "Artificial lungs" is developed. The statement of the task of optimal control of actuating mechanisms of the test facility "Artificial lungs" is formalized: the equation of object control in the form of differential equations is formulated,...

When preparing cement raw slurry, in order to regulate its aggregative stability and flowability, a coal-alkaline additive is used, which not only changes the surface properties of disperse particles, but also intensifies the portland cement clinker synthesis process. Adding of coal-alkaline reagent...

The paper describes a complex method for forming aircraft panels as well as automated plants for bending, peen forming, sanding, and shot peening. It also describes calculation methods for technological conditions which compensate for the effect of the residual stress on the shape of parts

The definition of the concepts of theoretical and operating moisture of building materials is given in the paper. The estimated moisture is determined. To determine operating moisture, the analysis methods are used. The issues with the estimated moisture based on field studies are presented. Methods...

The system of assumptions of the mathematical description of the process of chemisorption of carbon dioxide in a regenerative cartridge is formalized. The authors developed a mathematical model suitable for carrying out imitation studies of the static and dynamic characteristics of the chemisorption...

The paper reviews research data of reactive power compensation for Metro electric power substations. According to comparative analysis of Metro, it is necessary to compensate reactive power in order to reduce its the negative consequences, which are also presented. Reactive power compensation ensures...

The article discusses the influence of the non-sinusoidal form of the voltages of the supplying three-phase network on the quality of the rectified voltage from multipulse rectifier with a circular outline of the valve shoulder. The research aims at identifying the most stable rectification circuit during...

Onrush of additive technologies might allow a 3D concrete printing method to become more profitable and efficient for building unique constructions than traditional methods of building. Until the XXI century, the science paid special attention to phenomena and processes at two levels: microscopic scale...