bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of robustness of information embedding into digital images DWT domain using QIM method against destructive effects and steganalysis
Authors: Evsutin O O , Melman A S , Filippov A A , Chernov I D
Published: November 2020

Steganography is one of effective solutions to ensure information confidentiality. For this purpose, secret information is embedded into a cover object, for example, a digital image. However, embedded data can be detected using steganalysis techniques. As a result, an attacker can apply destructive effects to the stego-image and destroy the embedded data to prevent their hidden transmission. Therefore, this paper presents a study of robustness of information embedding into digital images DWT domain using QIM method against destructive effects (JPEG compression, brightness change, etc.) and statistical steganalysis at the same time. The results will help to increase the efficiency of information embedding into DWT domain of digital images.
Mathematical model as a means of predicting effectiveness of well intervention for near-wellbore space
Authors: Gabdrakhmanova K F , Izmaylova G R , Mikhaylov M O
Published: November 2020

The conclusion about the appropriateness of using this or that type of well intervention equipment should be based not only on the technological and economic efficiency but also on a mathematical model. The existing geological and field restrictions for the selection of impact objects for each type of well intervention should not also be overlooked due to the fact that in this case the use of a mathematical model is more appropriate. A fundamentally new method of multifunctional regressive mathematical modeling for evaluating the technological efficiency of processing the bottom-hole zone with an increase in the oil recovery coefficient is described. A new algorithm for determining the dependence of the technology efficiency is proposed, the obtained multivariate regression model is checked for statistical reliability and significance, the forecast for the increase in oil recovery coefficient is calculated
Methodological basis of simulation and cognitive modelling technology of socio-economic systems
Authors: Ginis L A
Published: November 2020

The results of the study are presented in the article, the purpose of which is to provide a methodology for modeling studies and forecasting the development of social and economic systems (SES) based on fuzzy hierarchical cognitive approach. The task of developing methods of SES formalization is being solved. Basic methods: system analysis, hierarchical multilevel system theory, control and decision-making theory, graph theory, fuzzy set and fuzzy logic theory, simulation modeling. The subject of the study is a generalized model of the socio-economic system. The paper describes the theoretical foundations of the original simulation-cognitive modeling technology developed to model socio-economic systems. The technology combines crisp and fuzzy cognitive models. The theoretical-multiple metamodel of the complex system under study is disclosed, the identification model of which is based on the metamatrix developed by the author. There is presented an integrated diagram of the methodology of application simulation-cognitive methodologies of SES, its stages are indicated. The practical application of the methodology will make it possible to develop science-based management solutions to ensure the safe and sustainable development of SES and to take into account the human risk factor.
The use of a production approach in the development of decision support systems for medical purposes
Authors: Gruzenkin D V , Novikov O S , Sukhanova A V , Kukartsev V V , Tynchenko V S , Mikhalev A S
Published: November 2020

This article discusses the application of the production approach to the implementation of decision support systems, the input for which is a number of signs, and the output is a number of response actions. The general solution using the Cartesian product of sets is described. In addition, block diagrams and diagrams are given for visualization of theoretical material, and an example of an existing medical system implemented on the basis of the described solution is also considered. The relevance of traditional approaches to the development of a decision support system is proved along with the growing popularity of artificial neural networks.
Method for increasing the dynamic range of digital images based on modular arithmetic
Authors: Guzhov V I , Ilinykh S P , Khaidukov D S
Published: November 2020

The article proposes a new method of synthesis of digital images from several digital images to increase the dynamic range of intensity. The method is based on modular arithmetic. The increased range is divided into several residual classes. The full value of the intensity is calculated as the solution of the system of comparisons of residues for given modules. An analysis is made of the stability of the proposed method to the nonlinearity of the transfer characteristic and digital image recording devices under various types of interference. To this end, the maximum range for changing the brightness of a digital image is limited. By selecting the magnitude of the modules and the maximum brightness value, the distance between the diagonals in the decision table is selected so that this distance is greater than the level of distortion and (or) interference. Experimental validation of the method has been performed.
Scaling algorithm designed to reduce circuit costs for modular digital filters
Authors: Kalmykov I A , Sidorov N S , Tyncherov K T , Vorohov A A
Published: November 2020

Currently, there is a tendency to increase the speed and accuracy of data processing in computer networks (CN). It is possible to meet these requirements through the use of new technologies in CN telecommunication devices that rely on residue class codes (RNS). In these codes, input values are presented as sets of remainder moduli of the RNS base selected. As a result, arithmetic operations are performed in parallel, which provides an increased speed of signal processing. Therefore, RNS codes are used in high-speed modular digital filters (MDF). To advance the accuracy of digital signal processing in MDF, the number of RNS bases is increased, which leads to greater circuit costs. It is possible to remedy this shortcoming by scaling an MDF response. Hence, it is crucial to develop a scaling algorithm to reduce circuit costs for MDF implementation.
Algorithm for assessing effectiveness of renewable energy facilities placement
Authors: Kirichenko A S , Kirichenko E V
Published: November 2020

Criteria affecting the choice of an optimal option for placing renewable energy facilities with regards to the methodology for calculating the capacity and amount of generated energy have been selected. The features of calculating a spatial data matrix are shown. An algorithm for creating a spatial data matrix for renewable energy resources applicable to the Krasnodar Territory is presented. An algorithm for choosing the best option for placing renewable energy facilities is presented.
Data sharing by means of multiple fog robot servers
Authors: Klimenko A B , Ivanov D Y
Published: November 2020

Fog robotics is an entirely new direction in the robotic field, inspired by the fogcomputing concept. Some fog architectures have been developed for robots groups and robot swarms, yet, to the best of our knowledge, there are no developed mechanisms of data sharing and replication in such structures. So, they are in the focus of this paper. The distributed ledger-based architecture for the fog robot servers is considered and described, as well as some models have been developed to estimate the time needed for data sharing. Simulation results show the expediency of consensus methods usage for distributed ledger-based.
Modeling the management of fluctuations in stocks in production
Authors: Kukartsev V V , Tynchenko V S , Petrenko V E , Milov A V , Ezhemanskaya S N
Published: November 2020

The article describes a simulation model that describes the fluctuations of the system. It is possible to track changes of fluctuations in stocks levels, as well as in production. Fluctuations occur when the behavior of the model deviates above or below the equilibrium point. If the oscillations damp, they will become less and less and eventually disappear in the absence of an external force that stimulates them. This model was built with the help of the program Powersim Studio 7 Express. The input interface of the model is shown. It includes such data as “Equipment correction time”, “Changing timeout”, “Inventory”, “Equipment” and “Expected demand”. This model contains three constants, two auxiliary variables, two drives and three streams. An experiment was conducted on the input data. As a result of the experiment an output interface was created and it includes such graphs as “Behavior “Expected Demand”, “Order Level” and “Production” during the simulation” and “Comparison of “Equipment” and “Required Equipment” during the simulation”. According to these graphs, it is possible to track the actual and necessary equipment used in production, as well as understand how much needs to be produced to cover the discrepancies between stocks and desired stocks, as well as expected consumer demand.
Dynamic model of the work team composition in the organization
Authors: Kukartsev V V , Tynchenko V S , Dzhioeva N N , Kukartsev V A , Yamshchikov A S
Published: November 2020

The article presents a dynamic model of the composition of the labour collective in the organization. The model is built, taking into account the following categories of workers: «Executives», «Specialists», «Employees», «Workers» using Powersim Studio. Our model is multidimensional. A model management interface was created, which includes an input interface through which data is entered, as well as an output interface that allows seeing the difference between new employees and experienced ones. During the experiment, a model of the life cycle of an employee in an organization from hiring, adapting, working to experienced employees to the subsequent dismissal was considered. Based on the calculations, it was concluded that the recruitment rate, the speed of dismissals and the total number of employees affect the reception of new employees.
Fuzzy formalization of the multi-stage processes temporal description
Authors: Lomazov A V , Lomazov V A , Rumbesht V V
Published: November 2020

The problem of constructing the periodization of socio-economic and organizational-technological processes, which makes it possible to divide them into stages for a more detailed study, is considered. The methodological basis of the study is the conceptual apparatus of L. Zadeh’s theory of the linguistic variable in combination with expert assessment technologies. According to the specifics of the description of non-stationary processes, a linguistic variable has been developed, the values of which (temporal terms) correspond to the stages of the process. A new type of temporal terms that are semantically described by bitrapezoidal membership functions is proposed, and an expert procedure for constructing these terms is indicated. A system of algebraic operations on temporal terms is proposed and justified (by statements on properties), which allows formulating syntactic and semantic rules for the transformation of terms. The proposed formal linguistic description of the stages allows the analysis of socio-economic and organizational-technological processes using the procedure of fuzzy inference based on a fuzzy production rule about the subject area, which can help increase the scientific validity of management decisions.
Mathematical description of commutation in multipulse rectification schemes with voltage asymmetry
Authors: Neyman L A , Neyman V Yu , Linnik K S
Published: November 2020

Modern achievements in the field of construction of transformers and Converter technology allow creating integrated multipulse rectifier units that meet the currently increased requirements of electromagnetic compatibility between different consumers of electric energy and the network feeder. Current rectification carried out with the help of valve devices is closely related to commutation processes, the widespread use and distribution of which requires accurate consideration of the factors that determine them. One of the important questions is the degree of influence of the structural asymmetry of the transformer converter of the number of phases on the overlap angle and on the rectified voltage in the commutation zone. The paper offers a mathematical description of the steady-state process for solving a wide group of practical problems, including commutation periods for the case of converter asymmetry with an arbitrary number of ripples of the rectified voltage.
Modelling transients in high-order electrical circuits in Matlab Simulink
Authors: Neyman V Yu , Prokopov A V , Less V M
Published: November 2020

The relevance of the study is due to the need to improve and expand the possibilities of calculating electrical circuits in transients. As an object for research, linear electric circuits of the second and higher order with zero initial conditions are considered. The main goal of the research is the task of performing dynamic calculations when simulating transients in linear high-order circuits by the methods of structural simulation in the Matlab Simulink software environment. The main attention is paid to the issues of constructing structural diagrams of high-order electric circuit models. The basis for the description of processes is the equation, compiled according to the laws of Kirchhoff, linking the instantaneous values of currents and voltages of the elements of the electric circuit through their parameters. Examples of numerical modelling using variants of models of structural circuits of the electric circuit are given. The advantages of the method of simulation structural modelling in the calculation of dynamic circuits with respect to existing analytical methods for calculating transients in high-order circuits are also considered in this paper.
Finite-element modelling of electrodynamic processes as a method of determining the optimal number of turns on a winding of a machine press electromagnetic motor
Authors: Neyman V Yu , Balabanov A M
Published: November 2020

This article presents the optimization problem solution employing the methods of finite-element modelling of electrodynamic processes for choosing the number of winding turns in an electromagnetic motor driving a machine press. The subject of the investigation is a new methodology for identifying optimization solutions to a differential equation describing the finite-element model of the electromagnetic motor and analyzing its calculated dynamic characteristics. The object of the investigation is a cylindrical construction of an electromagnetic motor with two working gaps and a combined composite armature. The basis of the finite-element model is a computational scheme and a software package created at the Department of Applied Mathematics at Novosibirsk State Technical University. It is illustrated that the applied computing apparatus and the software package allow performing an accurate search for the optimal number of turns on a winding of an electromagnetic motor at the design stage with due consideration for the required geometric parameters and the magnetic properties of the structural materials employed for obtaining the maximum final velocity of the armature in motion.
Impact investigation of road characteristics on the accident rate based on the neural network modelling
Authors: Pechatnova E V , Kuznetsov V N
Published: November 2020

The use of neural networks promotes flexible non-linear modelling. Also, it is the perspective direction. The article investigates the influence of the main road characteristics on the accident rate. Twelve variables are selected as the main road characteristics. The result of modelling is the two-layer feed-forward neural network with hidden sigmoid nodes and linear output nodes. The operability of the model is estimated by calculating the index of regression by training, validation and testing. The results are acceptable for the intended purpose. The resulting model can be used for assessing and forecasting the safety rate on the two-lane roads with the intensity of 120 to 340 cars/hour. These include a significant part of the streets of CIS countries and other states. Besides, the neural network model can become the basis for the development of software products for assessing the accident rate based on road characteristics or can be implemented in existing software.
The removing of multiple reflections from a curved interface at the common-source seismogram
Authors: Rabinovich E V , Demianenko A V , Turkin A S
Published: November 2020

The proposed simplified version of the original solution for the actual problem of removing multiple reflections from a curved interface at common-source seismogram is suggested. The solution to this problem is complicated in the framework of the approach based on using a reflected wave’s hodograph. The proposed solution is based on the analytical expression for describing a reflecting interface structural form. The expression is obtained using the location algorithm based on solving only direct kinematic seismic problems. There is an analytical expression; one can calculate the propagation paths of the multiple reflections and its arrival times at the receivers of the observation base. If a seismic wavelet is detected in a limited range, including a multiple reflected wave arrival time, it is possible to remove the detected wavelet for eliminating its distorting effect to the direct reflected signal.
Analysis of the stationary availability factor of fault-tolerant three-layer local area networks
Authors: Rahman P A
Published: November 2020

This scientific paper is devoted to the fault-tolerant local area networks with three functional layers: core, distribution and access. The reliability analysis of three-layer networks using the reliability model of the group of identical and independent restorable elements and offered by the author formulas for calculation of the stationary availability factor of three-layer local area networks with single and multiple distribution subgroups are discussed. Finally, an example of calculation of the stationary availability factor of the fault-tolerant three-layer local area network with two distribution subgroups is presented.
Using cloud-based machine learning technologies in limited funded social research
Authors: Romanchukov SV , Berestneva OG , Berezhnova EV
Published: November 2020

This work is devoted to the description of cloud solutions for machine learning, which are already used in the business data analysis and may be applicable in the social sciences. First of all, the article is addressed to specialists in sociology/psychology/economics/gender studies, who need a deep analysis of the accumulated data, but at the same time do not have sufficient expertise in the field of mathematics, machine learning and Big Data processing and/or do not have sufficient funding to support the staff of professional analysts or data scientists. Using as an example one dataset, the size and structure of which are comparable with those for various social studies, we go through all stages of training and testing the model in Google Cloud AI and IBM Watson Auto AI, comparing their advantages and disadvantages.
Stress-deformed state of a fixed support of the unit with account of influence of near back technical devices with geometric deviations
Authors: Rubtsov A V , Kulakov P A , Mukhametzyanov Z R , Farshatov A R , Bayazitov M I , Kovshova Yu S , Gimaltdinov I K
Published: November 2020

The normative and technical documentation in the field of industrial safety establishes permissible deviation standards at which the equipment can be operated at a given technological mode and regular monitoring of the technical condition. As a rule, the main method for detecting deviations is visual and measuring control, as well as geodetic measurements, allowing fixing the admissibility or inadmissibility of geometric deviations. However, the current methods do not provide the calculation of structures with geometric deviations under current operating loads with the determination and assessment of the places of the occurring maximum stresses, as well as their values. The stress-strain state of the process equipment also does not provide the assessment from the effects of neighboring technical devices that are in the common technological system and have various geometric deviations during installation. In this paper, we study the relation of technical devices that are in a common technological system and have geometric deviations such as deviation from verticality and the displacement of the edges by the stress-strain state of the fixed support of a horizontally located apparatus.
Modeling a stressed-deformed state of a technological pipeline with a displacement of edges
Authors: Rubtsov A V , Kulakov P A , Mukhametzyanov Z R , Farshatov A R , Bayazitov M I , Kovshova Yu S , Gimaltdinov I K
Published: November 2020

During installation or repair of pipeline routes, a deviation such as a displacement of the edges of the docking elements, which is formed due to a certain mistake in preparation for welding and welding of the section, is possible. The permissible values of the displacing edges are regulated by the state standard and other regulatory and technical documentation in the field of design, installation, operation and repair of process pipelines. When identifying displacement sizes not exceeding the permissible limits, the pipeline is allowed further operation. In the future, to ensure reliable operation of the pipeline, a periodic assessment of its technical condition is carried out according to current standards. However, even the allowable displacement of the edges is a kind of stress concentrator and can be a source of crack nucleation and further destruction, which will lead to an emergency. Current methods for diagnosing and extending the life of pipelines do not include measures to assess the maximum stresses of welded joints with offsets. There is no analysis of how the displacement of the edges in certain areas affects the stress-deformed state of the entire pipeline as a whole, and what impact do co-locate technical devices have with possible geometric deviations during installation, for example, deviations from verticality. In this paper, we study the interconnection between the effects of technologically neighboring apparatuses and deviations from verticality formed during installation, as well as areas of displacement of the edges of the processing pipeline to the stress-deformed state of the pipeline as a whole.
Hierarchical approach to artificial intelligence
Authors: Zhigalov K , Avetisyan K , Konyukhov V Y , Osmaev A D
Published: November 2020

There are three promising directions of artificial intelligence in the 21st century: focused solutions, i.e. solutions used only in a specific field; artificial intelligence of the general direction – a neural computer capable of performing any intellectual action typical for a man or a society and development of artificial superintelligence with scientific creativity, wisdom and communication skills. This paper is aimed at considering a hierarchical approach to the application of artificial intelligence. It is assumed that the hierarchical approach will allow more accurately choosing the required type of solution when dealing with any automation task.
Use of HTTP filtering devices in automated control systems based on the technology of the Industrial Internet of Things
Authors: Budnikov K I , Serdyukov O V , Kurochkin AV , Nestulya RV
Published: November 2020

The use of the Industrial Internet of Things (IIoT) technology helps to increase the efficiency of the enterprise and reduce production costs. IIoT devices send large amounts of data that tied directly to production and related factors to a cloud storage. In addition, IIoT devices are used by engineering personnel through wireless devices. One of the protocols for interacting with IIoT devices is HTTP using embedded web servers. Establishing a secure HTTPS protocol connection is not always possible or justified due to its resource consumption. In this situation, to increase security, it is appropriate to apply an additional HTTP filter to regulate the access of mobile devices being used by engineering personnel to access to IIoT devices, as well as to certain features that specific devices provide over HTTP. The paper discusses HTTP filtering devices on Gridex-II hardware platform of the industrial type. The results of their bench tests with standard and improved filtering algorithms are presented.
Towards the species of the auto relock schemes of the high-frequency feedback loops of the stabilization systems
Authors: Gurov M G , Gurova E G
Published: November 2020

In this paper, we discuss existing and propose new schemes of the feedback auto relock. These schemes provide a closing loop of the logic sequence: keeping stabilization point - automatic search of the stabilization ranges and lock points. The addition correctors to update old and to create new feedbacks schemes were proposed. These correctors allow extended or potentially infinite operation time, for correction signals.
Theory and practice of positioning a solar panel to obtain peak power points at weather stations
Authors: Kochmarev K O , Malozyomov B V , Kuznetsova Svetlana Yurievna , Ignatev I V
Published: November 2020

This paper discusses various methods for positioning solar panels in space for autonomous power supply of weather station equipment. The principles of operation of these methods are described; their advantages and disadvantages are indicated. An effective positioning calculation was also made for one of them. The basic conditions under which one or another method is worthwhile are identified. It is determined that depending on the territorial location and environmental conditions, various positioning methods can be selected.
Analysis of the mathematical modelling results of displacements and deformations induced by the construction of the escalator tunnel of "Mining Institute” station in Saint Petersburg
Authors: Novozhenin S U , Vystrchil M G , Bogdanova K A
Published: November 2020

The article presents the results of mathematical modelling of geomechanical processes that occur during the construction of an escalator tunnel using EPB TBM at the «Mining Institute» station in Saint Petersburg. A numerical model was built using the finite element method implemented in «Plaxis 3D» software. Hardening soil model was used for modelling of soil massif. The analysis of the distribution of displacements and deformations in the main cross-sections of the displacement trough is performed. Issues of assessing the harmful effects of underground construction on undermined buildings and structures are considered. Based on the research, we can conclude that the construction of a tunnel is safe for undermined buildings with strict tunnelling technologies compliance.
Development of autonomous traction system of electric vehicle with electronic differential and fuzzy control system
Authors: Popov N S , Anosov V N , Vilberger M E , Domakhin E A , Anibroev V I , Singizin I I
Published: November 2020

The article discusses the optimal layout of an autonomous vehicle traction system. In modern society, a special place is occupied by environmental issues. From year to year, a huge amount of statistics is published that reflect the scale of the damage that human products cause to the environment. Today, the main “pest” on the planet is surely cars with an internal combustion engine. At the same time, a complete rejection of motor transport, both in Russia and in the world, is impossible, because the life of modern man is inextricably linked with the constant movements, which are not always possible through urban electric transport. In recent years, many manufacturers of transport systems see the way out in autonomous electric transport systems development, which, in the future, will be able to replace vehicles with an internal combustion engine. In this article traction system variants, choice of electric motor optimal location, and also the control systems analysis which would correspond to requirements to the given technical process are considered.
Justification for the parameters of extraction panels under the conditions of increased water inflows using computer models of rock mass
Authors: Sidorenko A A , Belova D V , Sirenko Y G
Published: November 2020

The purpose of the research is to increase the efficiency of underground mining of flat coal-bearing seams with powered longwalls in the areas characterized by complex hypsometry and high water inflows. The modern global trend to increase the size of extraction panel (the length of longwall and the length of column) during the development of flat coal-bearing seams is shown. The results of the development of a three-dimensional model of the array are presented, which allows building profiles of the earth surface and the developed seams in the areas with complex hypsometry. The applicability of the use of such models to determine the rational place for the formation of dismantling chamber is shown. The interrelation between the length of longwall and the length of extraction panel during the mining thick coal-bearing seams is shown. The assessment of the additional costs and damages caused by the division of the extraction panels into two parts is carried out to ensure an upward order of mining reserves under the conditions of increased water inflows. The field of rational application of the division of extraction panel into two parts for the conditions of the mine site named after V.D.Yalevsky is determined.
Robot technological system of analysis of cybersecurity information systems and communication networks
Authors: Maksimova E A , Sadovnikova N P , Baranov V V , Gromov Yu Yu , Lauta O S , Tret’yakova L V
Published: November 2020

The article presents the authors’ views on the organization of the modern system of cybersecurity. We considered the tasks, assigned to the monitoring subsystem and reconnaissance of cyberspace as a source of preventive hardware and software effects on the opposing side. The shortcomings of the existing structures of such subsystems are analyzed and the requirements to the intelligent automated system of cybersecurity are specified. The article offers hardware and software solutions, based on the development of a mobile robotic system for audit the stability of the network infrastructure and applications to existing and future cyber threats. A variant of the functional scheme of a robotic system with a universal housing is presented and with a set of mechanical drives, depending on the characteristics of the problems to be solved. For providing high functional flexibility and speed of the robotic system it is proposed to use fuzzy neural networks. The union of two independent theories - neural networks and fuzzy logic - allowed creating neural-fuzzy systems, having a high level of intelligence and independence in decision-making. The advantage of hybrid neural-fuzzy technology of modeling and information processing is the ability to view the generated rules and giving them a meaningful linguistic interpretation. A reasonable conclusion is made, that is the main meaning of that is the main meaning of the shift of creation concepts and using of artificial intelligence - transition from individual systems to distributed information processing and the development of multi-agent intelligent systems.
Speed regulation in vector control systems of synchronous motor drive
Authors: Matiukhova E S , Kucher E S
Published: November 2020

This article examines speed control systems in AC electric motors based on a permanent magnet synchronous motor. Special focus will be on the methods of parametric synthesis of controllers for controlling the speed of a synchronous motor with permanent magnets by deviation. The developed automatic engine control system should provide fixation, processing, robustness to signal, and parametric disturbances. The article also presents the results of digital modelling of a vector control system for a permanent-magnet synchronous motor and comparative analysis of these methods for synthesizing an engine control system based on the results.
Design of determining performance indices of positioning drive using computer vision laboratory bench
Authors: Popov N S , Domakhin E A , Anibroev V I , Singizin I I
Published: November 2020

The right choice of an electric machine directly affects the quality indicators of the technological process. Positioning accuracy and movement repeatability are key parameters for the robot. A servo drive with position feedback is most suitable for these requirements. A robot based on DC servo drive was built for educational purposes. In order to determine the quality indicators of the drive control, an experimental setup was built, and software was developed for the experiment using computer vision. As a result of the obtained data analysis, significant shortcomings of this drive type were detected.
Traction characteristics modeling of a linear motor for driving an electromagnetic press
Authors: Aksyutin V A , Less V M , Prokopov A V
Published: November 2020

The research relevance is connected with the need to improve the calculating methods of the linear press motor used in the drive of the press. As a research object, a cylindrical electromagnetic engine, powered by a pulse voltage source is examined in this paper. The results of the traction characteristics modeling of an electromagnetic motor, which determines the useful mechanical work and the efficiency of the electromagnetic press, are presented here. A simplified model is proposed in the form of an equivalent magnetic circuit of an electromagnetic motor. The calculation is based on the law of the total current for a closed magnetic circuit, depending on the core position coordinate. By solving differential equations of the second order, simple analytical expressions are obtained that allow calculating the electromagnetic traction force depending on the current and the position coordinates of the moving core of the electromagnetic press motor. An example of calculating the traction characteristics of calculating an electromagnetic motor is considered based on the created model. The results of comparing the calculated traction characteristics with the results of calculations obtained by other researchers are also presented.
Investigation of the heating mode of nonmagnetic products in the induction system with permanent magnets
Authors: Aliferov A I , Morev A E , Promzelev V A
Published: November 2020

The relevance of the work determined by the fact that at the present time in the area of new energy-saving electrotechnologies for heating of non-ferrous metals products focus is on induction heating in a transverse magnetic field, meanwhile not it is covered by the heating method in a transverse magnetic field a large range of products with rectangular cross-section made of non-ferrous metals. Currently, such products are heated in the induction heating installations in an alternating longitudinal magnetic field while electrical efficiency is not greater than 0.5. The attractiveness of heating of such products in the transverse rotating magnetic field of the permanent magnets is its potential to achieve electrical efficiency equal to 0.75-0.85. In the presented article, it is discussed performed studies of heating of aluminium products with rectangular and cylindrical cross-section to a temperature of 550 ° C.
Simulation of dynamic modes of power supply systems equipped with diesel generators, at inferior power quality
Authors: Bulatov Yu N , Kryukov A V , Van Huan Nguyen , Hung Tran Duy
Published: November 2020

The article provides results of studies aimed at implementation of power supply systems (PSS) computer-based models in conditions of inferior power quality, where the PSS include backup diesel generators. The main aim of the study was to research these generators synchronization with the PSS network. The simulation was performed in the MATLAB environment using the Simulink and SimPowerSystems software packages. Based on the results obtained, it can be concluded that the self-synchronization method can be used for turning on diesel generators for parallel operation with PSS. After the synchronization processes completion, an improvement in the quality indicators of electricity in the PSS network and at the interfaces with the power supply system in terms of asymmetry and harmonic distortions.
Improvement means of charge batteries for electric car
Authors: Ivanov V V , Myatezh S V , Dubinina I V , Savluk I G
Published: November 2020

This article discusses different means to charge electric car batteries, identifies trends in the development of a non-contact method of energy transfer, the calculation of the electrical parameters of the inductors for the implementation of the contactless charge of the battery of the electric vehicle. Produced simulation magnetically coupled system to confirm the theoretical results.
Critical pipeline of the acyclic wave processor
Authors: Khusainov A A
Published: November 2020

This paper is devoted to studying the performance of an acyclic wave processor consisting of heterogeneous processor elements having various delays. Data channels have sufficiently large buffers. The main result is the proof of the conjecture that for an arbitrary amount of input data, an acyclic wave processor contains a pipeline whose operating time is equal to the data processing time using the entire wave processor. This pipeline is called critical. For partially testing the conjecture, a multi-threaded application simulating the work of a two-dimensional pipeline has been developed. Earlier, the author proposed an algorithm for calculating the input processing time, the complexity of which depends not only on the number of stages but also on the amount of data. The proven conjecture eliminates this drawback, it allows building algorithms for calculating data processing time, the complexity of which does not depend on the amount of data. In particular, for any class of acyclic wave processors that have some algorithm of polynomial complexity for listing maximum pipelines, it is easy to construct a polynomial algorithm for calculating the data processing time for an arbitrary volume.
Algorithms for determining the maximum power point for photo modules at weather stations
Authors: Kochmarev K O , Malozyomov B V , Boginskaya O A , Ignatev I V , Gavrilova Zh L
Published: November 2020

The work is devoted to methods for increasing the energy efficiency of photovoltaic modules. Various algorithms for determining the maximum power points and their application to obtain the maximum possible efficiency when using solar panels are considered. The principles of the operation of algorithms are described; their advantages and disadvantages are indicated. Their comparison was carried out according to the main significant parameters. The most suitable algorithm for application at a weather station has been selected.
Vehicle energy consumption as factor of combined power plant parameters’ definition
Authors: Kulikov K I , Schurov N I
Published: November 2020

The development and creation of innovative transport systems, environmentally friendly and energy-efficient vehicles must be considered as the strategic direction of the global transport industry. The equipment improving and its operation modes optimization allows efficient use of available traction drive resources. The implementation of innovative technologies using modern storage devices and non-traditional fuels provide high-efficiency electricity usage by the electrical complex. The hydrogen fuel usage is considered in this article as one of the common areas of electric vehicles development. Hydrogen is the first element of the Periodic Element System and the most common in the universe. On Earth, by the number of atoms in compounds (17%) Hydrogen is second only to oxygen (52%). Hydrogen is non-toxic - combustion products are water vapors, it has the highest combustion heat per unit of mass compared to other types of fuels. All these factors, coupled with the current trends of the widespread implementation of energy-saving technologies, are encouraging the world’s car companies to move from the advancement of the traditional car to the design of new types of vehicles using Hydrogen as the primary source of energy.
The concept of creating an adaptive sensorless system for monitoring the load of electromechanical equipment
Authors: Varykhalov D A , Pimenova O N , Ugarov G G , Moshkin V I , Lappi F E
Published: November 2020

The concept of building sensorless systems for monitoring the load of electromechanical equipment is proposed based on the possibility of determining the instantaneous value of mechanical power based solely on the values of currents and flow connections that determine the operating modes of the machine. A criterion for evaluating the efficiency of an electric machine is proposed in the form of an optimal energy conversion mode, characterized by the theoretically maximum achievable level of the developed mechanical power of energy conversion. It is shown that it is possible to determine the mechanical power developed by an alternating current electric machine based on the flow coupling associated with the winding and the current flowing in this winding. The optimal phase shift angles for the motor and generator modes of operation of an electromechanical energy Converter, which form the maximum mechanical power of energy conversion, are determined.
Diagnostics of emergency conditions of the engine DC
Authors: Menshchikov I A , Ugarov G G , Moshkin V I , Petrenko Y V
Published: November 2020

The article presents the results of an experimental study of the diagnostic process and mathematical processing of diagnostic information using logarithmic spectral analysis of the values and shape of the current in the DC armature circuit with various damage to the armature winding. Diagnostics of the state of DC electric machines is an important practical task. Failure to detect timely violations of the operation of individual components of the machine, in particular, damage to the armature winding can lead to serious accidents at work. Most of the currently used diagnostic systems have been developed based on studying the design of electrical machines and physical processes of converting electromagnetic energy, both experimentally and by analyzing mathematical models. Today’s available measuring and computing technologies have made it possible to use many previously studied phenomena in diagnostics. They have also become the basis for searching for new signals that enrich diagnostic information.
Issue of maintenance of energy converter factor of the cavitation heat generator at constant level
Authors: Porsev E G , Malozyomov B V
Published: November 2020

The problems of converting mechanical energy into heat, which involves the use of cavitation phenomena in a moving fluid to obtain heat in an amount exceeding the electrical energy at the entrance to the system, are considered. Recommendations are given for production to generate heat for the heating buildings and hot water to reduce primary energy consumption and increase the level of environmental safety.
Study of the patterns of change in absorption current over time and its use for measuring insulation resistance
Authors: Solomentsev K Yu , Lachin V I , Dyachenko V B , Plotnikov D A , Khovpachev A A , Solomentsev Ya K
Published: November 2020

The article presents a computer simulation of absorption currents in dielectrics. The results of the study of changes in the absorption currents in time, as well as accelerated measurement of the insulation resistance taking into account the absorption current, are considered. When measuring the insulation resistance of electric power facilities, the absorption current which flows through the insulation and drops to zero in a very long time may initially exceed the leakage current. The article analyzes various patterns of representing the absorption current and proposes a new formula containing exponential and power functions. An approach is proposed for accelerated measurement of insulation resistance using extrapolation of absorption currents, that is, the calculation of the value (forecast) of the steady-state current in the measuring circuit, without waiting for the end of the absorption current flow and transients.
Mathematical modeling and analysis of electrical complexes for power quality improvement on the basis of active and passive filters
Authors: Sychev Yu A , Abramovich B N , Prokhorova V B
Published: November 2020

The necessity of usage of electrical complexes for power quality improvement on the basis of active and passive filters is proved in the paper. The main tasks, which must be solved by these complexes in the area of power quality improvement, are indicated. The mathematical models and relationships of the main topologies of these complexes are developed and proved. The computer simulation models have been developed on the basis of the mentioned mathematical models and relationships. The results, which have been obtained during simulation, showed the satisfactory level of power quality improvement. Also the obtained results should be considered as the theoretical basis for the structural and parametrical synthesis of the electrical complexes for power quality improvement on the basis of active and passive filters in centralized, distributed and combined power supply systems.
Modern approach to enterprise information systems
Authors: Alchinov A , Tavbulatova Z K , Dudareva O V , Ivanov M Yu
Published: November 2020

As computing systems and facilities evolved, and as they expanded into industry, it became necessary to integrate specific computing devices and information systems built on them into single information-computer environments. At the same time, the developers of information computation system (ICS) faced many problems.
Development of functional fault-tolerant system
Authors: Zhigalov K , Kuznetsova S Yu , Sygotina M V
Published: November 2020

Before you begin to develop a fault-tolerant system, you should specify the system requirements. Besides high fault tolerance and performance, the computing system shall be highly available. Such systems include NUMA systems with non-uniform memory access, SMP systems with symmetrical multiprocessing and MPP mass-parallel systems. The ultimate choice of architecture largely depends on whether maximum performance, scalability, or fault tolerance and availability are needed.
Development of an algorithm for determining the diameter and number of compressor stations of a gas pipeline in the C++ programming language
Authors: Ivanik S A , Eroshkin S O , Koshelkov I A , Shalygin A V
Published: November 2020

The paper considers the possibility of selecting the optimal diameter of a gas pipeline with a length of more than 1000 km and a capacity of 10 million m3 per year of natural gas using an algorithm developed in the C++ programming language in order to minimize time costs. The results of calculations for three options of pipeline diameters - 820, 1020, 1200 mm are considered to justify the proposed algorithm. The gas pipeline strength in the longitudinal direction was checked for the inadmissibility of plastic deformations and general stability using standard calculation methods laid down in the program. Temperature differences and parameters of the pumped product are taken into account.