bluuebunny/crossref_metadata_2025 huggingface dataset:
Consideration of nonlinear properties of new structural materials
Authors: Gelver I S , Kolunin A V , Shudykin A S
Published: September 2019

In recent years, new structural materials (composite and polymer materials, non-ferrous alloys) are widely used in mechanical engineering. For example, in the production of high-pressure vessels, in order to lighten the design, a thin-walled aluminum alloy liner is installed in a strong carbon fiber shell. However, such materials are among the physically nonlinear ones, when, even with minor deformations, there are significant deviations from the Hooke’s law. Therefore, the development of methods to account for this effect and assessment of its impact on the stress-strain state of the design is an actual problem. In this paper, the authors justify the possibility of using the finite element method for nonlinear relationship between stresses and strains. They propose to approximate a real deformation diagram by a cubic parabola. As a result, the calculation data are obtained in the form similar to the linear theory of the finite element method.
Investigation of the influence of the length of the rope suspension of the bridge crane and the length of displacement of the cargo in the controlled sway mode on the time of displacement
Authors: Korytov Mikhail S , Shcherbakov Vitaly S , Titenko Vladimir V
Published: September 2019

The formulas for a complete analytical solution of the problem of moving cargo on a pendulum suspension of constant length along a given trajectory in a plane setting are presented. To set the desired trajectory as a time dependence of the linear horizontal coordinate of the cargo in a limited time interval, two-point Hermite polynomials are used. The field of application of the method is the automatic control of the movement of bridge and gantry cranes, as well as modeling of crane working processes. The application is limited to small angles of deviation of the cargo rope of the bridge crane from the gravitational vertical. The method makes it possible to quickly synthesize the optimal trajectory of the point of cargo suspension movement, which accurately provides the required trajectory of cargo movement. For a series of constant values of the maximum acceleration developed by the point of suspension of the cargo during a single transient process, graphs of the moving time dependences from moving length and cargo rope length are revealed. The functions obtained are not smooth and have a fracture. This makes it impractical to approximate them using the regression equation, due to the high error of the latter. The resulting graphs can be used to determine the time of movement of the cargo depending on the specified length of moving, the length of the cargo rope and the maximum acceleration developed by the drive of the cargo suspension.
Simulation model for the determination of energy losses during vibrations of the working equipment of a earth-moving machine in the transport mode
Authors: Korytov M S , Shcherbakov V S , Titenko V V , Ots D A
Published: September 2019

A simulation model for a earth-moving machine is developed using a motor grader as an example. The model comprises a chassis base frame, a front balancing bridge, rear balancing carts and working equipment – a traction frame with a moldboard. These elements are included in the form of separate moving elements. The simulation model allows the vibrations of the machine units to be explored while it moves along the microrelief of a reference surface, as well as the energy loss due to friction in the suspension elements of the working equipment to be determined. Using this simulation model, the amount of energy accumulated with the help of improved suspension devices for the working equipment of the motor grader can be assessed. This allows for the combination of the vibration damping of the working equipment in the transport mode and the oscillation energy accumulation. The effect of the stiffness and viscous friction coefficients of the hydraulic cylinders for raising and lowering the moldboard with a device for dynamic vibration damping and the accumulation of their energy on the total amount of energy spent on dissipation in the hydraulic components of the working equipment suspension elements is established. The resulting graphical functional dependence allows the optimization of the parameters of the hydraulic, mechanical and electrical parts of the system of the vibration damping and energy storing device to be implemented.
Mechanical action on edges of plastic parts using electrohydraulic effect
Authors: Kovalevsky V F , Skobelev S B , Bezzateeva E G , Bury G G , Poteryaev I K
Published: September 2019

The paper reviews the methods of cleaning plastic parts from flash. The principle of plant operation to obtain L. A. Yutkin electro-hydraulic effect is considered. The design of a pilot plant, as well as replaceable devices used to remove the flash from the edges of plastic parts is presented. The results of experimental studies of the electro-hydraulic effect for deflashing are presented.
Geometrical synthesis of four-bar gear train with related gears
Authors: Krukov V A , Nguyen D T , Plyasov A V
Published: September 2019

The method of optimal geometric synthesis of four-bar cylindrical gear with related gears with one external and one internal gearing is proposed. The method is based on a new calculation system that increases the number of synthesis output parameters to six, which makes it possible to considerably expand the domain of existence of the synthesis problem solution with the simultaneous synthesis of two gearing. The software implementing the proposed technique is described. To solve the problem of nonlinear mathematical programming the library of Optimization Toolbox functions included in Matlab is used. Examples of calculations are given.
Geometric And Computer Modeling of Forming the Gear Wheels with Elliptical Centroid
Authors: Lyashkov A A , Reinhard A J , Murashev G E
Published: September 2019

A fairly simple and accurate methodology of automated forming of the teeth of a wheel with an elliptical centroid is proposed. This methodology is based on computer simulation of the real process of forming and does not require the application of complex mathematical body used in most traditional methods. The key point of the methodology is the proposed solution for determining the instantaneous centers of the cutting tool and the angles of its rotation around these centers. The relative position of the cutting tooth profiles is determined by two arrays of point coordinates: one on the elliptical centroid of the non-circular wheel, the other - on its equidistant curve. Compared to the traditional methods, this methodology is a universal and much more efficient and accurate one, especially for wheels with an elliptical centroid. The proposed automated solid-state computer simulation of the forming allows to obtain not only the envelope part of the profile, but also to observe possible formation of transition curves on it and undercutting, which leads to a qualitative solution of the profiling problem. According to the developed algorithms and programs, a computer model of a non-circular wheel is obtained, on the basis of which a corresponding item used in hydraulic unit pumps is made on a CNC machine.
Development of a measures complex to reduce the technogenic impact of launches of the promising Irtysh launch vehicle in the impact areas of the Baikonur cosmodrome
Authors: Suimenbayev B T , Trushlyakov V I , Yermoldina G T , Suimenbayeva Zh B , Bapyshev A M
Published: September 2019

Scientific and methodological approaches to minimizing the technogenic impact of launches of the promising launch vehicles of the Irtysh type with the oxygen-kerosene main liquid rocket engines of the Baiterek rocket complex in the impact areas of the Baikonur cosmodrome are considered. The basic directions for the reducing the technogenic impact of the worked-off booster of the first stage of the Irtysh type launch vehicle in the impact areas are: determining the optimal site for the worked-off stages (WS) fall in the selected zones of the impact areas that have the greatest resistance and the minimum cost on the restoration of the soil grounds of the site of the WS fall to its initial state - (A); controlled WS descent after separation from the LV into the designated site of the fall with an accuracy not exceeding the size of the selected optimal site - (B). To solve problems of the direction A, it is proposed to create an additional information and analytical system of the impact area. To solve problems of the direction B, possible design solutions are proposed based on the evaporation of unused liquid fuel residues in the WS tanks, and using the resulting vapor-gas mixtures for controlled WS descent to the dedicated zone of the impact area.
Research procedure of radial clearances in rolling bearings
Authors: Tarasov V N , Boyarkina I V , Tarasov E V , Boyarkin G N
Published: September 2019

In the result of the rolling bearing research it has been found that the bearing radial clearance, especially with a small number z of rolling elements z<15 besides technological factors depends on the rolling element location in the bearing during measurement. During operation the simple rolling bearing design is characterized by complex dynamic processes. In theoretical mechanics general technical calculations are carried out for absolutely rigid bodies that are not deformed during the working load application. This position is completely used in design diagrams as the deformations of races and rolling elements are not taken into consideration. If the bearing is manufactured and operated with a nominally reasonable value of the radial clearance, then the probability of its successful operation will be very high. During the bearing manufacturing it’s necessary to take into consideration the radial clearance as a geometric parameter along with other dimensions of the bearing. Analytical expressions for the radial clearance calculation have been obtained for the first time for odd and even layouts of the rolling element location in the bearing operating area. The calculation results for definite bearings are given. The justification of initial clearances and creation of the analytical method for the radial clearance determination represent a crucial task of the rolling bearing theory.
Rotating tethered system for active space debris removal
Authors: Trushlyakov V I , Yudintsev V V
Published: September 2019

A new technique for active debris removal using tethered space tug is presented. Instead of towing the captured debris object by pulling on the attached tether it is proposed to use the rotation of the tethered tug-debris system that allows to apply the tug’s thrust along the tether pushing the system. The rotation of the tug-debris tethered system around its center of mass provides necessary tension of the tether when the tug applies its thrust along the tether. To de-orbit the system the tug should apply its thrust periodically when the orientation of the tether relative to the the orbital velocity vector of the system ensures application of the impulse in the required direction. A simple mathematical model of tethered tug-debris system is developed which allows to estimate required angular rate of the system. A tether control law is proposed that reduces the amplitude of the tether oscillations during applying tug’s thrust.
Study of filler microstructure in magnetic soft composites
Authors: Valiev H H , Ya Minaev A , Stepanov G V , Karnet Yu N
Published: September 2019

Electron and atomic force microscopy were used for the study of magnetoactive filler surface microstructure in a magnetorheological composite. The particles redistribution phenomena of filler aggregates on the surface of elastomers under the action of a small external applied constant magnetic field are visualized. A model is proposed for the interaction of a magnetoactive filler with an elastomeric matrix of the composite, which explains the observed experimental results.
Increasing operation capacity for spherical bearing of indexing spatial mechanism under load
Authors: Zakharenkov N V , Konovalov V E , Kvasov I N , Bigushev Sh M
Published: September 2019

Indexing rotary mechanism is widely used in automatic machines. There are studies of such mechanism kinematics showing its effectiveness. The undertaken strength studies demonstrate the ability of the mechanism to operate under specified loads. Actual tests performed on prototypes exposed inoperativeness of the spherical bearing, namely jamming, under the load. The current work analyzes the failure of the spherical bearing. Factors affecting the jamming are determined as well. Such factors are forces at engagement and the friction forces at spherical surfaces contact. Structural provisions are proposed and considered to solve the issue of jamming and provide the mechanism normal operation.
Mixed Random Sampling of Frames method for counting number of motifs
Authors: Yudina M N , Zadorozhnyi V N , Yudin E B
Published: September 2019

The problem of calculating the frequencies of network motifs on three and four nodes in large networks is considered. Telecommunications networks, cell molecular networks are investigated. The sizes of the investigated networks are hundreds of thousands of nodes and connections. These networks are represented in the form of directed and undirected simple graphs. Exact calculating requires huge computational resources for such large graphs. A method for calculating the frequencies of network motifs using the Monte Carlo method with control of an accuracy of calculations is proposed. The proposed effective method minimizes the value of the coefficient of variation.
Increasing the selectivity of semiconductor gas sensors working at sinusoidal-varying temperature for machine industry safety systems
Authors: Demin I E
Published: September 2019

The article considers the possibility of creating a sensor system on the basis of 50%In2O3–50%Ga2O3 thin films, functioning at sinusoidal-varying temperature, with high selectivity to a number of key industrial gases including ethanol, acetone, ammonia, and propane-butane. A study of temperature and time dependencies of resistance at a sinusoidal-varying operating temperature was conducted. The deviation of the dynamic dependencies of the resistance from the harmonic law was detected, the reason of which should be considered to be the non-linearity of the temperature dependencies of the gas-induced response and the response time constants. The complex shape of the obtained dynamic characteristics was analyzed using Fourier transform. It has been shown that the resultant Fourier images can be used as sources of a large number of information parameters, which are suitable for increasing the selectivity of the sensor system operating in the considered mode of operation. It has been demonstrated that the selection of the amplitudes of the first three harmonics of Fourier images as information parameters allows the unambiguous identification of the type of the analyzed gas.
Control systems design: the technology of simulation and optimization
Authors: Denisova L A , Meshcheryakov V A
Published: September 2019

The simulation and optimization technology is proposed for creating control systems that are designed for heat and power facilities. This paper presents an automatic feed control system of steam generators in the nuclear power plant unit on the basis of microprocessor controllers. The technology of simulation and optimization combines the methods of statistical modelling of disturbance signals, the control system simulation and the controller parameters optimization using genetic algorithm. As the initial data for the model design, we used archival information about processes on the existing unit equipment. The results of simulation studies and optimization of automatic control system’s parameters are derived in MATLAB.
Multistage self-orientating gauge measuring system best fitting parameters for circularity estimation
Authors: Diakov D , Vassilev V , Nikolova H
Published: September 2019

The deviation of circularity estimation of large-scaled details in many cases is a serious metrological problem, which can be solved using a measuring system based on a multistage self-orientating gauge. The purpose of this paper is to study the influence of the gauge parameters on the accuracy of measurement of the circularity deviation and optimization thereof in order to ensure the maximum correspondence between the real and the measured profile. The accuracy of the re-creation of individual and group of harmonic components of the profile is examined. Analytical and experimental research results are provided.
Automatic mixers for the synthesis of functional mixtures with desired properties from small batches
Authors: Evseev A V
Published: September 2019

This study presents the advantages of automatic rotary, biorotary, conveyor mixers compared to existing designs of mixing devices. The relevance and novelty of the development are shown by obtaining a total batch of a mixed product with a given qualitative and quantitative characteristics from the available small batch mixtures, which differ in technological parameters. Quality control for the obtained mixtures is also analyzed.
Complex approach for monitoring the parameters of the wire
Authors: Galagan R , Muraviov A , Tomashuk A
Published: September 2019

The paper briefly describes the diffraction method for measuring the diameter of long-length products such as metal wire, optical fiber, chemical fiber, metal ingots or nonmetal. A method and optical device for monitoring the diameter and surface temperature of such products are proposed. The main advantage of the proposed method is to monitoring the parameters of the heated product even on the defocused image. In this paper we propose a set of methods that can improve the accuracy of measuring the diameter and temperature of such products. The methods are based on optical phenomena and digital image processing methods.
Study of friction between the web and the air turning bar
Authors: Kudryavtsev S A , Kulikov G B , Gersenshteyn I S , Syltanova Y M , Kulikova E V
Published: September 2019

In this paper, we will discuss a method used to reduce friction and ink set-off in web-fed machines through implementing an air cushion between the web and the air bar used to influence the web trajectory. In the available academic literature, there is no study of the friction force between said two surfaces. Our goal is to establish a correlation between air tension, tensile and the web’s width. A specially designed experimental air bar was created; in a series of experiments, air was fed into the gap between the bar and the wrapping web. The results (friction force’s dependence on air tension, tensile and web’s width) are to be taken into account while designing web conductors for web-fed printing machines.
New diagnostic signs of the technical condition of piston compressors on the basis of characteristic function of the vibroacoustic signal
Authors: Kudryavtseva I S , Naumenko A P , Odinets A I , Bardanov V E
Published: September 2019

Topical issues of formation of the system elements of diagnostic signs of malfunctions and defects of piston compressors are considered in the paper. Diagnostic signs are formed on the basis of parameters of vibroacoustic signal. Vibration sensors are installed on various units of the piston compressor. Usually sensors are installed on the cylinder in the axial direction, on the compressor valves, on the crosshead, on the main bearing. Today, there are effective ways to assess the condition of components and parts of piston compressors on the parameters of the vibroacoustic signal, which are developed by the authors of this work. Diagnostic signs are based on statistical parameters of vibroacoustic signal such as the root-mean-square value of vibroacoustic signal, quantile of instantaneous values of vibroacoustic signal, spectral invariants the vibrating acoustic signal envelope. The first two groups of diagnostic traits are formed on the basis of statistical processing of signals for different types of machines. Thus, these features can only be used for a certain type of piston compressors. The appearance of faults and the degree of their hazards are estimated by the spectral inversion of the envelope of vibroacoustic signal regardless of the type of the machine. To increase certainty and reliability of diagnostics in this work it is suggested to use the size of module characteristic function of instantaneous values of vibroacoustic signal at the specified parameter characteristic function. Given that the module of the characteristic function varies from 0 to 1, it can be assumed that the value of the characteristic will not depend on the absolute value of the signal and, accordingly, on the type of machine. In this case, the characteristic function of the vibroacoustic signal is used, which is obtained at certain intervals by the angle of rotation of the crankshaft of the piston compressor in the region of the lower and upper dead points. Using probabilistic-statistical decision-making methods and the probability density functions of the modulus of the characteristic function, which are determined for different states of compressor nodes, the boundary values of the modulus of the characteristic function are obtained. Thus, the authors managed to get a diagnostic sign of faults and defects, which does not depend on the absolute value of the vibration acoustic signal. Thus, it is possible for the authors to first obtain a diagnostic feature of faults and defects on the basis of probabilistic characteristics of the vibration-acoustic signal, which is independent of absolute value of vibroacoustic signal.
Metrological analysis of measurements of elastic deformations in the contact zone of spherical corundum of the tips with the surface of the product
Authors: Leun E V
Published: September 2019

The article analyzes indirect measurements of elastic deformations of ld during video recording of the contact zone between the corundum spherical tip and the surface of the product. These measurements are due to the need to compensate for elastic deformations ld to improve the accuracy of contact measurements of the dimensions of the products characteristic of all measuring instruments: coordinate measuring machines, active control devices and other devices.

The method of measuring elastic deformations ld is similar to the measurement of Brinell hardness, but with a small clamping and immersion in the product of a spherical tip made of high-strength optically transparent material and the implementation of on-line visualization and video recording by a built-in measuring microscope of the formed control zone. Determined the sensitivity of this method, non-linear related to the radius of the spherical tip, Rtip and elastic deformations ld. The obtained expression for the measurement error of the deformations Δld that largely depends on thermal expansion of the tip ΔRtip(ΔT) and the registration error of the zone control Δlzc.
Software and technical implementation of intelligent energy-saving control systems based on industrial controllers
Authors: Yu Muromtsev D , Gribkov A N , Shamkin V N , Tyurin I V , Belousov O A , Belyaev M P
Published: September 2019

Automation and control systems of technological objects are widely used in almost all industries currently. They allow continuous monitoring of the main operating parameters of the object, as well as provide a synthesis of control actions to achieve the best performance indicators of the technological installation, both in terms of performance and energy saving. Therefore, the problem of developing systems for optimal energy-saving control is very significant and relevant. The article deals with the issues of software and hardware implementation of energy-saving systems for managing complex technological objects. The generalized structure of the energy-saving control system software, obtained by decomposing the system into separate functional subsystems and program modules, is presented. The proposed software structure is largely universal and invariant to various control objects. The main components of the technical support of the energy saving control system are considered. A practical example of software and hardware implementation of the system of energy-saving control of dynamic modes of a group of heat engineering devices (multi-section roller-belt drying units) based on industrial controllers is shown.
Algorithmic presentation of printed electronics verification in-process
Authors: Nagornova I V , Bablyuk E B , Lazareva O V , Trapeznikova O V , Charushina E B
Published: September 2019

Printed electronics products manufacturing is in the emerging stage demanding both technological infrastructure and methodological procedures development including performance monitoring system organization. In the study the developed verification in-process algorithm for flexible and wearable electronics production in the case of RFID-antenna, strain-gauge sensor and OLED-pixels based on updated printing techniques and equipment is proposed. It was shown the most valuable monitoring factors impacting deliverable end item quality are production-driven roughness parameters substrate and the underlying layers (elements), their intermixing and thermal post-processing conditions. The tolerance checkpoints parameters, patterns of selected parameters interaction and optimal monitoring stages were fixed.
Modelling of soft starters for automated electric drive
Authors: Nikonova G V , Nikonov A V , Makarochkin V V , Garms P G
Published: September 2019

In this paper we investigated the conditions of favorable start-up of fixed-speed induction motors in order to increase the functional reliability of the engines. The methods of controlled soft start of induction electric motors with a squirrel-cage rotors are investigated. The study of the mathematical model of induction motors for determining the dependencies of reducing the dynamic component of the transient electromagnetic moment and the magnitude of the starting current. A computer simulation to identify the effectiveness of different methods of controlled start-up of induction motor was carried out. To generate the starters’ models, the MatLab modelling application, Simulink and SimPowerSystems block libraries were used. Based on the results of transient processes simulation in MatLab, the comparative characteristics for different methods of starting an induction motor were given.
Feed rate evaluation of mechanical toothed hopper-feeding device with ring orientator for parts, asymmetric at the ends
Authors: Pantyukhina E V , Preis V V , Khachaturian A V
Published: September 2019

The paper considers an advanced design of a mechanical toothed hopper-feeding device with a ring orientator designed for automatic feeding of ax symmetric parts in the form of bodies of rotation, asymmetric at the ends, into technological machines. A new theoretical approach to the mathematical description of the feed rate of the mechanical toothed hopper-feeding device is proposed. This theoretical approach allows a correct assessment of the feed rate for various parts at the design stage of the technological machine, as well as to justify the rational parameters of the hopper-feeding device, in which its feed rate will be maximum.
Improving the quality of manufacture of the differential pinion gears through the integrated application of statistical methods of quality management
Authors: Safarov D T , Kondrashov A G
Published: September 2019

An approach is proposed to ensure a stable spot size in the interfaces of the satellites with the central gear. Characteristics are proposed for estimating the position of the contact patch on the lateral surface of the tooth The characteristics of the contact patch after circular broaching were analyzed using various statistical methods. The dependence of the characteristics and position of the contact patch on the tooth surface on a number of factors has been revealed. Proposed measures for their stabilization.
Application of the conformal mapping for state analysis of track circuits
Authors: Sokolov M M , Lunev S A
Published: September 2019

In the article, we present the results of using conformal mapping for state analysis of track circuits in various mode of operation. The work shows that the state of a track circuit can be derived from its input resistance. The article shows nomograms of input resistances when the rail line characteristics change. Authors regards that the input resistance areas for the control and shunt modes of the track circuit are completely separable over the entire range of variation of the rail line parameters. Nomograms of input resistances can be used in systems for diagnosing and monitoring track circuits.
Approach to the estimation of print layers offset in the printing system
Authors: Trapeznikova O V , Kolozova O A , Trapeznikov E V , Serkova L B
Published: September 2019

A significant number of scientific works and inventions is devoted to the problem of quantitative and qualitative accuracy evaluation of color reproduction, including its automation. Various approaches and methods of managing parameters estimating the quality of color image transmission on various information carriers, including printed media, are used in our country and abroad. However, in estimation the offset of printed layers, along with the control of color-to-color registration, it is important to determine the distance between raster point size and the initial one. The paper considers the approach to solving this problem. It is shown that the method provide not only the area of the nana-pattern estimation, but also the amount of nana-pattern offset relative to the ideal nana-dot.
Choosing the best objects by a set of the qualitative features
Authors: Gegechkori E T
Published: September 2019

It is generally accepted that the choice of the best technical solutions in the design of complex technical systems must be carried out on the basis of a multi-criteria approach. However, it is known that at the initial design stages, developers, as a rule, do not have exact values of basic technical indicators. Moreover, many (if not all) indicators are qualitative in nature, and the probability of making a non-optimal decision increases due to the uncertainty of the initial data. Therefore, it is advisable to try to restrict the choice domain, eliminating the deliberately “uncompetitive” objects. In the well-known ELECTRE method, for this purpose, some “preference” relation is introduced, indirectly determined by the choice of “weights” of particular quality indicators and threshold values of the so-called concordance and discordance indices. Unfortunately this approach is characterized by the lack of a clear operational sense of the weights and thresholds introduced, as well as the possible occurrence of oriented cycles in the preference relation graph. This makes it difficult to interpret the results of applying the procedure for excluding “worst” objects by the ELECTRE method. In this regard, the article proposes a new approach to the problem of choice domain restriction. On the set of the objects under consideration, some irreflexive and asymmetric dominance relation is constructed, allowing a solution according to von Neumann-Morgenstern, which simultaneously is also the so-called C-core. At the same time, the considered dominance relation – unlike the preference relation in the ELECTRE method already mentioned – has a clear “physical” meaning and does not require the introduction of any directly immeasurable parameters like “weights” and “thresholds,” which always question the adequacy of the model to actual decision maker’s preferences system.
Methods of forming the join table
Authors: Zykin S V
Published: September 2019

The present work considers the methods of forming data views as a join table intended to be used in table-driven user applications, such as spreadsheets, multidimensional arrays, etc. The main purpose of the join table is to organize the interaction of such applications with the corporate database. The join table can be used at a physical level. This will significantly reduce the time required to generate custom data views in the applications. The use of the join table becomes inefficient, if it needs to be changed in a short period of time. However, the use of storage devices with associative access or “logic-per-track” devices for data processing will significantly reduce the join table transformation time.
Identification of mathematical models parameters of electromechanical consumers of regionally isolated electrotechnical complexes
Authors: Kovalev V Z , Arhipova O V , Esin S S , Tatevosyan A A , Scherbakov A G
Published: September 2019

This article considers and develops a method for identifying the parameters of mathematical models of electromechanical consumers of regionally isolated electrotechnical complexes. The validity of the proposed method application to identify parameters to determine influence of consumer characteristics on the quality of electrical energy at the point of common coupling is shown. The description of the mathematical model of the electrical energy distribution point consisting of several consumes is shown. The mathematical model is developed in the Cauchy normal form. A modification of the Marquardt method is proposed as an identification tool.
Dynamic Stability of the Valve Electric Drive in Oscillatory Mode
Authors: Kulakovskiy Yu M , Aristov A V
Published: September 2019

The analysis results of the dynamic stability of the electric drive in oscillatory mode by means of the supply voltage phase modulation have been provided. The determining procedure of oscillatory electromagnetic torque and its starting and damping components, as well as of motion law for the motor operating element subject to inertial, damping and positional load has been developed and tested. It was shown that the valve electric drive dynamic stability in oscillatory mode can be estimated from the time behaviour of the torque angle under the dynamic transition to the static stable mode. The natural frequency-regulating algorithm of the electric drive has been determined, operating by regulating one of the phase-to-earth voltages, as well as a pull-in criterion operating under the variation of load parameters by the start of the electric drive on the specified oscillatory frequency. A chain diagram of electric drive in oscillatory mode with variable rest frequency has been contributed. The obtained research results can be recommended for use in engineering of low-frequency electromechanical oscillatory complexes in control and vibration test systems.
Vector space as an area of the operation risks characteristics for asynchronous electric machines
Authors: Kurilin S P , Denisov V N , Dli M I , Bobkov V I
Published: September 2019

The article is written in terms of topological theory for the asynchronous electric machine (AEM). During operation the vector space properties of AEM are changed under the influence of operational aging and operational damage. The information about its current properties is used to assess the AEM routine operating condition and the risks of the operational integrity loss. The authors analyze the vector spaces of the stator symmetric three–phase winding and the AEM rotor 9–phase cage. Their common working area is discovered, which serves as a communication channel for a stator and a rotor. A Working area operational testing methodology is described. Absolute and relative measures of risk for AEM operational integrity loss are introduced.
The PMSM-drive submersible centrifugal pumps efficiency determining
Authors: Lysenko O A , Simakov A V , Kharlamov V V
Published: September 2019

In the paper, the problems of modelling and calculating the electromagnetic moment are considered. The study subjects are submersible induction and synchronous electric motors for centrifugal pumps. This task is relevant, because the requirements for oil production technology are growing. A brief description of the electric submersible pumps (ESPs) is given and the main design features of submersible motors are presented. The software for constructing and calculating the mathematical model of a submersible motor is selected. The field lines pictures in the section of motors are created. Characteristics of moment-current, moment-slip, moment-angle are built. Comparison results of two types of submersible motors are presented.
Getting external load characteristics of the axle-box generator
Authors: Lysenko O A , Songin M V , Kail M S , Yu Marchinskiy I
Published: September 2019

This article addresses the problem of supplying freight railcars. It is about the axle-box generator. The generator uses to power the on-board electronics. The design feature consists in the fact that the generator is installed to the generator’s axle-box and, as a result, it has increased requirements for the weight and size indications. The generator was designed with an external rotor due to the limited space, since the rotor acts as an inductor. The inductor is made of permanent magnets. The stator is made of laminated electrical steel in the six-pointed star form. The winding is made of copper conductor with a cross-sectional area of 0.2 mm2. Characteristics are presented in the form of waveforms and graphs. During the experiment, a number of oscillograms were taken and harmonics were counted. Voltage were also measured at different loads and rotation speeds. The obtained power at an average speed of 30 km/h was 4 W, and at a speed of 80 km/h it was 6.3 W. The method for determining the parameters of the anchor chain equivalent circuit is given.
Multicomponent Emulsified Biofuels for Transport Diesel Engines
Authors: Markov V A , Kamaltdinov V G , Denisov A D , Bykovskaja L I
Published: September 2019

Vegetable oils are a significant raw material resource for producing biodiesel fuels. But while using vegetable oils as fuels, the coking of the combustion chamber elements and injectors’ spraying nozzles. These problems can be solved by supplying water into the combustion chamber through the injectors. The article considers an opportunity of ensuring the stable operation of the diesel engine when it is powered by multicomponent emulsified biofuels. Emulsions of petroleum diesel fuel, rapeseed oil and water were investigated. The results of experimental studies of the automotive diesel engine running on these fuels are presented. According to the test results the efficiency of using these emulsions as fuels for diesel engines was evaluated. The favorable combination of characteristics of fuel efficiency and toxicity of diesel engine exhaust gases is obtained by using an emulsion containing 57% of petroleum diesel fuel, 30% of rapeseed oil and 13% of water (by volume). At the maximum power mode, the replacement of petroleum diesel fuel with this emulsion enabled to reduce exhaust smoke opacity from 16.0 to 7.5% according to the Hartridge scale. By the modes of the thirteen-mode cycle the integral specific emission of nitrogen oxides NOx decreases from 6, 610 to 5, 552 g/(kW·h).
Calculation of resonant modes for power supply systems and development of measures on higher harmonics filtering
Authors: Osipov D S , Kovalenko D V , Eremin E N , Sidorov O A , Ya Bigun A
Published: September 2019

This paper presents the calculation of non-stationary non-sinusoidal mode of the power supply system (PSS) under the condition of current resonance (parallel resonance). Evaluation of the need for higher harmonics (HH) filtering was carried out. To achieve this, measurements of the actual level of HH and other unified power quality indexes were conducted, and oscillograms of the network mode parameters and HH spectrum were constructed. The measurement of unified power quality indexes was carried out with certified and calibrated power quality analyzers Metrel 2792A. These instruments satisfy the effective world standards on power quality and other reference documentation. Resonance frequencies where resonance modes emergence is possible were determined by calculation. Maximum overvoltage ratios for different points of the examined PSS were also determined.
Short-term forecast methods of electricity generation by solar power plants and its classification
Authors: Tyunkov D A , Gritsay A S , Potapov V I , Khamitov R N , Blohin A V , Kondratukova L K
Published: September 2019

The article provides a classification of existing forecast models the generation of electricity by solar power plants and discusses various options for forecast methods for each of the selected models. As a result of the study, it was concluded that the most promising forecast methods are hybrid statistical-adaptive methods.
The role of SiHn radicals generation in the mechanisms of formation of thin films of amorphous silicon
Authors: Baranova L V , Strunin V I , Zh Khudaybergenov G
Published: September 2019

In this research, we studied the processes of configuration changes to the structural elements of amorphous silicon thin films created by the decomposition of reacting gas mixture (silane and argon) in low-frequency glow discharge plasma. We analyzed how concentrations of various local atomic groups and their links depend on deposition parameters. We also defined phase composition and the role of SiHn radicals generation in the mechanisms of formation of hydrogenated amorphous silicon thin films deposited on glass and Sitall substrates.
Multi-criteria synthesis of standing connections of the support of the running screw CNC machine
Authors: Denisenko A F
Published: September 2019

The creation of modern CNC machines requires the development of the design of machine feed drives with specified performance criteria. Ensuring the characteristics of feed drives that meet these criteria is largely related to the reasonable choice of design and technological parameters of standing connections available in the design. It is shown that this task, due to the presence of several conflicting criteria and a significant number of variable design parameters (VDP), is the task of parametric multi-criteria synthesis of compounds. The stages of the procedure of parametric multi-criteria synthesis of stationary machine tools are considered. The design variables and the formation of permissible regions of their variation, determined by the presence of parametric, functional, and criterion constraints, are analyzed in detail. It is indicated that the determination of the solution search area (the Pareto region) is most conveniently performed by scanning using the LPτ -sequence. It is proposed, in connection with the complexity of describing the boundaries of the Pareto region, to use its approximation by the described hyper-parallelepiped. Since the area of the search for solutions is characterized by the fact that any solution belonging to it cannot be improved simultaneously by all criteria, it is proposed to use a generalized criterion, calculated during scanning, when selecting possible deviations of the VDP from nominal values. Calculations performed according to the proposed procedure for the left support of the running screw of the longitudinal feed drive of the CNC machine mod. 1P426DF3, allowed to determine the nominal values and deviations of each of the VDP standing connections.
The influence of aging on the structure and properties of metal 30n8kh6m3styu obtained by surfacing
Authors: Eremin E N , Losev A S , Ponomarev I A , Borodikhin S A , Matalasova A E
Published: September 2019

For surfacing wear-resistant coatings, flux-cored wires based on high-strength steels with the effect of secondary hardening are widely used. The aim of the work was to study the peculiarities of hardening by aging of economically alloyed steel 30N8Kh6M3STYu, obtained by welding wire with flux-cored wire. It has been established that such steel has the best results of durometric properties as a result of aging at a temperature of 550 °C for 2 hours. In this case, the microhardness of the structural components increases 1.2-1.4 times, and the steel hardness reaches 53 HRC. It is shown that the structure of steel after aging consists of martensite and 14 types of compounds of phase components. It was established that steel hardening is due to the formation of complexes of four carbides TiD0.707C0.5, Cr3C2, TiC, SiC, nine intermetallic compounds Cr0.92Mo3.08, Fe0.875Mo0.125, D2Ti, Mo0.984Ni0.016, Ti3Al, Ni3Ti, FeCr, AlFe, NiTi2 and nitride Fe24N10. The rather high values of the hardness of such steel after aging and the insignificant effect of the duration of the effect of heat treatment on the reduction of its values allow us to recommend flux-cored wire created on its basis for surfacing parts operating under conditions of moderate wear at elevated temperatures.
Effect of N2 and Ar on the properties of multicomponent ion-plasma coatings 12X18H10T+Cu+Al
Authors: Guchenko S A , Eremin E N , Zavatskaya O N , Ch Laurinas V , Yurov V M
Published: September 2019

Currently, more and more attention is paid to the creation of complex coatings on machine parts and mechanisms applied by various methods that can increase hardness, wear resistance, corrosion resistance and heat resistance. Improving the physicochemical and mechanical properties of relatively cheap metal alloys, when applied with such coatings, allows increasing the service life of parts, saving material resources. The purpose of the presented work is to create heat-resistant coatings that are not inferior in their characteristics to expensive heat-resistant steels. In the work, the heat resistance of ion-plasma coatings obtained by the method of cathode-ion bombardment at the same time by three electric arc evaporators (Cu, Al and chromium-nickel alloy) in an atmosphere of argon and nitrogen at a pressure of 0.5 Pa was studied. As a result of the measurements, it was established that the coatings obtained have a hardness and wear resistance greater than the nickel-chromium alloy itself; the heat resistance of the applied coatings, especially those obtained in argon, is uniquely high.
Structural-morphological features and fretting resistance of nanostructured topocomposites formed by ion-plasma modification
Authors: Korotaev D N , Poleschenko K N , Eremin E N , Vershinin G A , Tarasov E E , Ivanova E V
Published: September 2019

The article proposes an approach to solving the problem of increasing fretting resistance of lock joints of blades for gas turbine engines through the creation of nanostructured topocomposites with the surface layers in a metastable state having a low shear stability in terms of vibrofriction. The authors implement the method of vacuum combined ion-plasma processing, which allows forming the surface layers of the material with mixed amorphous-nanocrystal structure and purposeful controlling the surface morphology. They show that the proposed flow diagram allows developing the required morphology from the arrays of nano-sized conglomerates of the “asperity – cavity” type on the surface. A comparative study of fretting resistance of nanostructured topocomposites in terms of vibrofriction is carried out. It is established that the specificity of their wear is to reduce the wear rate at the initial stage.
Development of Two-Component Polymer-Polymeric Composites Based on UHMWPE-PP Blends for Additive Manufacturing
Authors: Panin S V , Buslovich D G , Kornienko L A , Alexenko V O , Dontsov Yu V
Published: September 2019

In order to develop extrudable polymer composites for additive manufacturing some mechanical and tribological properties of polymer-polymeric mixtures of ultra-high molecular weight polyethylene (UHMWPE) and polypropylene (PP) have been investigated. The problem of selecting rational compositions with the aim of improving the manufacturability (extrudability) of UHMWPE was solved. It is shown that extrudable 3D-printed UHMWPE composites over their tribomechanical properties (wear resistance, friction coefficient, elastic modulus, yield point, tensile strength, and elongation at break) exceed those of the hot pressing fabricated composite. This is related to more uniform ordered permolecular structure formation with increased crystallinity. It is shown that the composite ″UHMWPE + 20 wt.% PP″ is the most efficient from the standpoint of maintaining high tribomechanical properties and possessing acceptable melt flow rate (MFR) index.