bluuebunny/crossref_metadata_2025 huggingface dataset:
Method for investigating rarefied gas flow around a cylindrical surface at arbitrary Knudsen numbers
Authors: Belov Vladimir N , Mayasov Evgeny G , Pervushkina Elena A , Statuev Aleksey A , Trukhmanov Viacheslav B
Published: November 2021

A moment method for solving the linearized kinetic Boltzmann equation for arbitrary Knudsen numbers is presented. The isothermal flow of a rarefied gas around a cylindrical surface (the limiting cylindrical Couette problem) is investigated. The moments of the collision integral are calculated for the hard sphere model. The moment of resistance force acting per unit length of the surface, the profile of the gas flow velocity in the transient regime, and the gas velocity on the surface are calculated.
Boundary problems in cellular automata for topological insulators
Authors: Fedchenko D P , Novikov V V , Timofeev I V
Published: November 2021

In physics, a topological insulator is a material that simultaneously exhibits the properties of a conductor on the surface and an insulator in the bulk. An abstract model of a twodimensional topological insulator is described in terms of tricolour cellular automata and excitations of a topological insulator are classified.
Analysis of the effect of synchronization of a group of nonexplosive sources on the results of field work
Authors: Maykov O A
Published: November 2021

The article deals with the issues of synchronization of a group of sources for exploration of minerals. A group of 3 impulse sources with different delay times (500,1000,2000 μs) for a two-phase medium is modeled, the upper layer is a water layer 20 meters deep, the lower layer is a layer of sedimentary rocks 350 meters deep. Impulse action is one period of harmonic oscillation with a period of 0.1 s. Time diagrams were recorded at depths of 50 and 100 meters. It is shown that the use of a delay of 2000 μs leads to a halving of the signal amplitude at a depth of 100 meters. The data obtained show that improving the synchronization of a group of sources for the needs of seismic exploration will allow focusing and creating the maximum signal amplitude at a given point.
Computational analysis of the digital footprint using machine learning and artificial intelligence
Authors: Munister V D , Zolkin A L , Malikov V N , Kosnikova O V , Poskryakov I A
Published: November 2021

The article discusses the procedure of step-by-step formalization of the software model of the system for accounting and forecasting the effectiveness of employees of an IT enterprise The issue of control of social interaction is considered. The relational model from game theory based on a specific data model template is proposed. Generalization in form of highlighting the categorical apparatus of metrics that directly or indirectly affect the procedure for assessing work efficiency, downtime or incorrect use of a working device (computer) is proposed. An architectural model of the application is proposed and substantiated, a model of a system for working with metrics is determined, the implementation of the necessary analysis tools in form of a combination of various machine learning algorithms used in systems with a binary classification based on decision making by the operator (the object of analysis) is described. The article summarizes the economic effect of the implementation of this approach in employee control systems.
Development of a prototype of an automated control system for household devices based on the “smart home” technology
Authors: Popov A A , Yakimov S P , Satsuk M M , Artyshko A A
Published: November 2021

The relevance of the studied and solved problem lies, on the one hand, in the possibility of automated control of your home devices, and on the other, in the absence of unified control systems for a smart home as a project. The latter thesis implies the actual absence of such an automated control system among the existing and sold ready-made solutions, which could be expanded by the user himself, that is, by the buyer. In this regard, there is a need to improve and develop our own product in this area. This approach will allow you to combine both the creation of your own working prototype of a smart home, and your own implementation of the automated control system, which will allow each user to refine, modify and implement new devices independently in an already assembled system based on his house or apartment. This article presents the main aspects of the design and software solution used. The software implementation is performed in the JetBrains PhpStorm development environment in PHP, Apache web server, MySQL DBMS.
Data mining technologies in a distributed medical information system
Authors: Bolnokin V E , Mutin D I , Mutina E I , Vyskub V G , Kravets O Ja
Published: November 2021

Proposed a method for solving the problem of identifying hidden relationships in hard-to-structure data that have an implicit character is considered using information mining. Proposed decision trees, the effectiveness of which is illustrated by a specific example. The use of OLAP analysis systems on data presented using in the form of a real or virtual hypercube’s information is an effective tool for the effectiveness of the management for medical monitoring
Decision support in complex organizational systems using neural network technologies
Authors: Kindaev A Yu , Moiseev A V , Vyhristyuk E I
Published: November 2021

In complex organizational systems in which there is asymmetry of information, an important element of effective work is equal access to objective statistics. Because of the benefits to one of the parties in such systems, key elements of effective management and making the right decisions, it is necessary to develop independent approaches. The developed approach makes it possible to assess risks in various situations and with various interactions within the system, and also allows you to recreate the missing information for decision-making from open statistical databases. The key element of the developed approach is the use of self-organizing Kohonen neural networks, which make it possible to classify objects based on the reconstructed information. The importance of the correct grouping of system objects makes it possible to recommend a management decision with greater accuracy. The developed approach allows you to reduce uncertainty (risk), and, as a result, reduce losses and maximize profits.
An improved LogNNet classifier for IoT applications
Authors: Heidari H , Velichko A A
Published: November 2021

In the age of neural networks and Internet of Things (IoT), the search for new neural network architectures capable of operating on devices with limited computing power and small memory size is becoming an urgent agenda. Designing suitable algorithms for IoT applications is an important task. The paper proposes a feed forward LogNNet neural network, which uses a semi-linear Henon type discrete chaotic map to classify MNIST-10 dataset. The model is composed of reservoir part and trainable classifier. The aim of the reservoir part is transforming the inputs to maximize the classification accuracy using a special matrix filing method and a time series generated by the chaotic map. The parameters of the chaotic map are optimized using particle swarm optimization with random immigrants. As a result, the proposed LogNNet/Henon classifier has higher accuracy and the same RAM usage, compared to the original version of LogNNet, and offers promising opportunities for implementation in IoT devices. In addition, a direct relation between the value of entropy and accuracy of the classification is demonstrated.
Principles of securing RESTful API web services developed with python frameworks
Authors: Kornienko D V , Mishina S V , Shcherbatykh S V , Melnikov M O
Published: November 2021

This article discusses the key points of developing a secure RESTful web service API for keeping a student achievement journal. The relevance of using web services has been analyzed. The classification of web applications is given. The features of the Single Page Application architecture were considered. Comparative characteristics of architectural styles of application programming interfaces are given. Requirements to be met by RESTful API services are considered. The basic principles of API security were analyzed. A list of the main vulnerabilities that may appear during the development of the REST API is given. An overview of popular authentication schemes (methods) is given. Comparative characteristics of web frameworks of the Python programming language are given. The main tools used in the development of web API applications are listed. The process of creating a secure prototype of a RESTful web service API in Python using the Flask microframework and a tool for describing the Swagger specifications is presented. The process of configuring the application was examined in detail. The main recommendations for securing a web application, database and web server settings are listed. The key points of ensuring the protection of the developed web application are considered. The results obtained were analyzed.
Agents’ ontologies negotiation in cohesive hybrid intelligent multi-agent systems
Authors: Kirikov I A , Listopad S V , Luchko A S
Published: November 2021

The paper proposes the model for negotiating intelligent agents’ ontologies in cohesive hybrid intelligent multi-agent systems. Intelligent agent in this study will be called relatively autonomous software entity with developed domain models and goal-setting mechanisms. When such agents have to work together within single hybrid intelligent multi-agent systems to solve some problem, the working process “go wild”, if there are significant differences between the agents’ “points of view” on the domain, goals and rules of joint work. In this regard, in order to reduce labor costs for integrating intelligent agents into a single system, the concept of cohesive hybrid intelligent multi-agent systems was proposed that implement mechanisms for negotiating goals, domain models and building a protocol for solving the problems posed. The presence of these mechanisms is especially important when building intelligent systems from intelligent agents created by various independent development teams.
New hybrid signature schemes with increasing level of resistance
Authors: Komarova A V , Menshchikov A A , Korobeynikov A G
Published: November 2021

Post-quantum cryptography is becoming an increasingly popular topic for research around the world. The global cryptographic community is on the verge of standardizing new post-quantum algorithms. The world’s largest organizations conduct their own research in this direction. In this article, two hybrid schemes are proposed. They are constructed on generalized methods of increasing resistance of authentication schemes. Hybrid schemes consist of a combination of two independent signature schemes, one of which is the well-known classical asymmetric electronic signature scheme and another one is post-quantum scheme. Thus, this paper suggests the combining Crystals-Dilithium scheme with Rabin scheme and Elgamal scheme respectively. The paper also provides estimates of public key and signature lengths. Conclusions are drawn about the expediency of using generalized methods of combining with such kind of schemes.
Fractional Riccati equation to model the dynamics of COVID-19 coronovirus infection
Authors: Tverdyi D A , Parovik R I
Published: November 2021

The article proposes a mathematical model based on the fractional Riccati equation to describe the dynamics of COVID-19 coronavirus infection in the Republic of Uzbekistan and the Russian Federation. The model fractional Riccati equation is an equation with variable coefficients and a derivative of a fractional variable order of the Gerasimov-Caputo type. The solution to the model Riccati equation is given using the modified Newton method. The obtained model curves are compared with the experimental data of COVID-19 coronavirus infection in the Republic of Uzbekistan and the Russian Federation. It is shown that with a suitable choice of parameters in the mathematical model, the calculated curves give results close to real experimental data.
Simulation of knowledge development in an innovation system based on neural network model
Authors: Soloviev V P , Rozaliev V L
Published: November 2021

Innovative development is impossible without the support of scientific research capable of forming fundamentally new technological approaches. The process of knowledge development cannot be fully formalized, therefore, management decisions are made in conditions of uncertainty. The models developed on the basis of self-organization are the most effective for predicting the development of knowledge in the innovation system. On the basis of the developed recurrent neural network, the analysis of the influence of the state scientific and technical policy on the formation of the strategies of the actors of the national innovation systems of the BRICS countries is carried out. The determinants of the influence of the state scientific and technical policy on the development of knowledge in the innovation system are revealed.
Quadrature method for broadband measurement of microwave path parameters
Authors: Gimpilevich Yu , Tyschuk Yu
Published: November 2021

A mathematical model has been developed for the procedure for broadband automatic measurement of the complex reflection coefficient and power level in the microwave path based on the quadrature measurement method. Analytical expressions are obtained for the quadrature components at the outputs of a quadrature demodulator connected with a switch to two non-directional measuring probes for the case of an unmatched microwave path. A modified system of nonlinear equations with respect to measured values was formed and solved, which allows setting zero assumptions. A block diagram of a broadband device for built-in automatic control of microwave channel parameters has been developed, which implements the developed measurement procedure and the solution of a system of measurement equations to determine the current values of the power level factor, as well as the modulus and argument of the complex reflection coefficient.
Information and analytical system for environmental monitoring of water bodies
Authors: Popov A A , Satsuk M M , Artyshko A A , Mironov D E , Nechaev N S
Published: November 2021

An integral part of maintaining a favorable environmental situation on our planet is the observation of its individual objects, including special attention is paid to water bodies. This is due not only to the natural human need for its consumption, but also to other aspects of the anthropogenic factor, which includes unintentional pollution of the environment with industrial and other waste. The task of increasing the effectiveness of measures aimed at the effective performance of work on the collection of water and soil samples from individual reservoirs, as well as the collection, accumulation and processing of data on reservoirs through the introduction of a system of environmental monitoring of water bodies is being solved. Such a system will speed up the work of environmental organizations, and also contributes to the formation of a brief set of recommendations for restoration measures and will give an overall assessment of the ecological state of the reservoir. The purpose of this work is to automate the process of accounting and processing information about the results of laboratory studies of various types of samples and tests on the basis of the performed cycle of calculations to form estimates and recommendations on the ecological state of the reservoir and to make final reports.
Analysis of the operational readiness of telecommunication networks
Authors: Pirkhavka A P , Legkiy N M , Kartsan I N , Zhukov A O
Published: November 2021

The article discusses telecommunication communication networks of various topologies. The definition of the operational readiness coefficient is given. The analysis of various networks of different topologies for the reliability of information transmission is carried out. Comparison of the reliability of the ring and radial topologies in terms of the operational availability factor is carried out.
Method for fast classification of MNIST digits on Arduino UNO board using LogNNet and linear congruential generator
Authors: Izotov Y A , Velichko A A , Boriskov P P
Published: November 2021

The paper presents a method for forming a reservoir of a neural network LogNNet using a linear congruent pseudo-random number generator. This method made it possible to reduce the MNIST handwritten digit recognition time on the low-memory Arduino Uno board to 0.28 s for the LogNNet 784:20:10 configurations, with a classification accuracy of ~ 82%. It was found that the computations with integers gives an increase in the speed of the algorithm by more than 2 times in comparison with the algorithm using the real type when generating a chaotic time series. The developed method can be used to accelerate the calculations of edge devices in the field of “Internet of Things”, for example, for mobile medical devices, autonomous vehicle control systems and bionic suit control.
Multimodal neural network classifier of the functional state of the respiratory system
Authors: Filist S A , Myasnyankin M B , Safronov R I , Kuzmin A A
Published: November 2021

At present, the intelligent systems are used to study the functional state of living objects. They are often built on a multimodal basis, i.e. decision-making is carried out through several information channels with the subsequent aggregation of these decisions. In the proposed method, the electrocardiosignal is a source of information. The principle of multimodality is implemented by analyzing of various methods and aggregating the results using neural networks of block and hierarchical structure. The method was tested on the classification of patients with pneumonia with a clear diagnosis. A group of volunteers without pulmonary pathologies was used as an indifferent class.
Mathematical modeling of spatial gas flow in nozzles of nontrivial geometry
Authors: Bitkin S A , Korepanov M A , Koroleva M R , Karpov A I , Makarov S S
Published: November 2021

Numerical modeling of the spatial gas flow in an adjustable nozzle with an asymmetric critical section caused by the overlap of a part of the flow area by a gas flow regulator has been carried out. The mathematical model is based on three-dimensional models of gas dynamics, the method of large particles is used for calculation. When describing the unsteady flow of an inviscid gas, the system of Euler equations is used, written for a computational rectangular plane, taking into account the function of nozzle geometry. The results of calculations of flow parameters along a nozzle path with a uniform outlet section and with an obliquely cut outlet nozzle are presented. Calculations were carried out for completely open critical sections and for half overlapped. For oblique cut nozzles, the overlap of the critical section from the side of the short part and from the side of the long part of the oblique nozzle is considered.
Investigation of the influence of modification of the working tool for the manufacture of niobium case products
Authors: Yu Remshev E , Rasulov Z N , Voinash S A , Sokolova V A , Teterina I A , Malikov V N , Vagizov T N
Published: November 2021

The main production of machine-building enterprises of various industries is the production of metal parts and products, 90-95% of which are manufactured using metal processing by pressure. Ensuring the stability of the technological processes of cold stamping is impossible without the use of interoperative coatings, which play the role of lubrication, preventing the diffusion “setting” (interpenetration at the atomic-molecular level) of the processed materials and tools. Therefore, one of the tasks in constructing the technology for manufacturing parts from these materials is to conduct a test cycle to establish the most acceptable coatings at the intermediate stages of processing. In the process of studying the operability and manufacturability, it is also advisable to use new methods for evaluating quality indicators at separate stages of processing semi-finished products and at the stages of control of finished products, which allows practically eliminating defects due to internal defects, ensuring the uniformity of the microstructure and predicting the operability of finished products during operation. Ensuring the quality of stamped semi-finished products made of refractory metals (niobium, molybdenum) is an urgent task due to the significant proportion of defects during cold stamping of these parts.
Design of replaceable nozzles for connecting pipelines in electron beam welding
Authors: Tynchenko V S , Kukartsev V A , Dokshanin S G , Fedorova A V , Slinitsyna V , Stephanenko O S
Published: November 2021

The article is devoted to the use of electron beam welding for connecting pipelines in the oil and gas industry. The analysis of the proposed approach and equipment for creating permanent pipe-flange connections is carried out. The advantages and disadvantages of the proposed approach are considered. During the work, the welded seam was calculated. A set of interchangeable attachments for the turntable has also been developed. Thus, the purpose of this work is to improve the quality of welded joints of oil and gas equipment through the use of electron-beam welding technology and design of replaceable nozzles for a turntable for an electron-beam welding unit.
Application of electron beam welding as an alternative approach for connecting pipelines in oil and gas equipment
Authors: Cherepanov A I , Kravcova E G , Kukartsev V V , Kuznetsov A V , Minkin A N , Rogova D V
Published: November 2021

The article discusses electron beam welding for connecting pipelines. This approach has been reviewed in the literature. The technology of creating flange connections in the oil and gas industry is considered. The analysis and selection of the most suitable equipment for the creation of permanent joints of complex structures has been carried out. Thus, a literature-patent review of the current state and methods of using electron beam welding for various designs and control methods has been carried out. The analysis of the subject area showed that there is equipment, in particular, the TETA 6E400 installation and a turntable for creating such connections in the area under consideration. The proposed approach will improve the quality of flange-pipeline welded joints and reduce the cost.
Development of the design and justification of the parameters of the guide rapier of the weaving machine
Authors: Djuraev A , Madrakhimov Sh , Erkinov M
Published: November 2021

The article describes the design feature and the principle of operation of the recommended pattern of the weaving rapier guide. On the basis of theoretical studies, graphical dependencies of the parameters of the guide roller were adjusted, the system parameters were recommended by analyzes.
Research of the drawing of bars plate in the refiners
Authors: Vikharev S N , Morkovin VA
Published: November 2021

Object of research of article is the drawing of bars plate in the refiners at refining of chips and wood pulp. On the basis of the theory of contact interaction of bars influence of the drawing of plate on characteristics of contact processes is investigated. The friction coefficient between plate decreases at increase in density of contact of bars. At increase in an angle of crossing of bars rotor and stator and refining of pulp with concentration up to 6% the coefficient of friction decreases. At increase in an angle of crossing of bars chips and pulp with concentration over 10% the coefficient of friction increases. Therefore it is recommended to increase the angle of crossing of bars rotor and stator at refining of pulp of low concentration, and at refining of pulp of concentration over 10% and chips - to reduce, up to a radial arrangement.
Investigation of localization accuracy in UWB relative ranging system
Authors: Krasnov Timur V
Published: November 2021

The hybrid combination of a traditional positioning system with fixed reference points and a relative positioning system based on the relative position of network subscribers on the basis of measuring the distances between them increases the availability of the positioning system for moving objects in harsh environment and the accuracy of their positioning. Depending on the operating conditions, the cascade measurement of the distances between the nodes expands the working area with an acceptable positioning accuracy with the same number of fixed anchors.
Theoretical justification for the development of computer model of MDF structure and its milling process
Authors: Efimova T V , Ischenko T L
Published: November 2021

The main parameter for determination of quality of MDF boardprocessing after milling is roughness of the surface. The well-known models of wood cutting are unsuitable for the assessment of this parameter, since they make it possible to draw only qualitative conclusions about the roughness, they do not allow calculating the numerical value. To calculate the roughness value, the model must take into account the structure of the material and the main parameters affecting the roughness. The purpose of this work is to substantiate the development of a computer model of the MDF structure and the process of its milling using the finite element method. The implementation of this approach will allow, according to the specified parameters of the cutter and modes of its operation, to determine the quality and energy indicators of the milling process from a theoretical point of view. As a result of the work carried out, a detailed theoretical justification for the development of a computer model of MDF structure and the process of its milling was given. Its implementation makes it possible to determine the quality and energy parameters of the milling process according to the specified parameters of the cutter and its operating modes.
Simulation of the kinematics and gas dynamics of the centrifugal dispersion stand
Authors: Zverovshchikov A E , Bolshakov G S
Published: November 2021

The article studies the kinematics and gas dynamics of the centrifugal dispersion stand for spheroidizing hard alloy materials. When studying the process of centrifugal spraying on an experimental setup, it was found that the behavior of particles in the volume of the dispersion chamber is determined by the aerodynamics of gas flows formed in the working chamber. It is assumed that under the influence of gas flows, a spontaneous classification of the particles of the medium occurs, determined by the size of the latter. To study the trajectory of movement of particles of powder material in the working chamber and the deposition process, a gas-dynamic model of a centrifugal dispersion unit in the SolidWorks FlowSimulation application is proposed. The developed model of the centrifugal dispersion unit showed the possibility of operational analysis of the behavior of the gas flow, the trajectory of the particles of the powder material and the temperature of the obtained powder material, depending on the design and technological factors. The simulation results allow one to determine the principles of separation of a heterogeneous medium of particles into fractions, directly at the installation for the implementation of the method.
Computational methods based on fuzzy control algorithms for operational control and identification of control systems in smart production
Authors: Zolkin A L , Losev A N , Sychanina S N , Melnik T E , Buryakova O S
Published: November 2021

The problem of the functioning of complex technical systems is studied in this article. The authors consider the problem of structural and functional redundancy (the complexity of formalizing computational methods for dynamic and nonlinear systems used in modern industrial production). On the example of considering the structure of the climate control subsystem for a closed loop of an industrial unit, a fuzzy configurator model for controlling the operation of a refrigerator is formalized. It is reduced to: linearization of the reading of instantaneous temperatures from various loops of the considered control system, followed by fuzzification and antecedent analysis. Eventually this allows to implement a complex method of fuzzy control and calculation of structural redundancy in any configuration with a different probability ratio. The authors also raise the question of the comparability of the obtained data and application of the developed method as a tool for predictive analytics in technological processes of production management.
Investigation of the influence of the pattern of a disc mill set on the process of obtaining powdered pulp
Authors: Vasilyeva D Yu , Yurtaeva L V , Marchenko R A , Kaplyov E V , Zyryanov D E , Reshetova N S
Published: November 2021

On the market of pulp and paper products, new requests for more narrowly targeted products appear every year. To stay competitive in the market, manufacturers need to use not only traditional types of fibrous materials, but also use with excellent characteristics from the usual cellulose. The article discusses the role of the knife process of pulp grinding. A method for producing powdered cellulose with preliminary grinding in a disk mill is proposed. The paper-forming properties of the pulp and the degree of polymerization of powdered cellulose, depending on the degree of grinding, are given.
Temperature dependence of dynamic and static modulus of elasticity of lightweight expanded clay aggregate concrete
Authors: Medvedev M A , Cherkasov A M , Tararushkin E V
Published: November 2021

The paper presents experimental research the static and dynamic modulus of elasticity of lightweight expanded clay aggregate concrete with averaged density of 1000 kg/m3. The static and dynamic modulus are obtained depending on the influence of temperature in the range from 5 to 50 °C with a step of 15 °C. The dynamic modulus was determined without pre-compression with a testing machine Asphalt Mixture Performance Tester. Besides the modulus of elasticity of lightweight concrete, the temperature dependence of unconfined compressive strength was also determined. Analysis of experimental data showed that with an increase in temperature, strength and modulus of elasticity slightly decrease, which is typical for concretes. For all cases, the temperature dependence can be characterized according to the linear law. Comparison of the static and dynamic modulus of elasticity showed that the dynamic modulus is 60-74% greater than the static modulus over the entire range of the studied temperatures.
Research of the possibility of improving the traction and economic characteristics of a supersonic passenger aircraft engine through minimal modifications to the high-pressure compressor
Authors: Strelets D Yu , Serebryansky S A , Shkurin M V
Published: November 2021

In this paper, the possibilities of improving the traction and economic characteristics of a by-pass turbojet engine of a high-speed passenger aircraft due to minimal modifications of the high-pressure compressor. A thermodynamic model of the investigated engine of a new design in a three-dimensional layout was formed using an automated multicriteria optimization process. A computational assessment of the change in the characteristics of compressor modifications is carried out based on a numerical model of gas dynamics.
On the subject of analyzing the post-buckling behavior of composite sandwich panels with thin skins of variable stiffness under longitudinal compression
Authors: Mitrofanov O V , Nazarov E V
Published: November 2021

The use of variable stiffness panels can be considered as one of the measures to improve the weight efficiency of aircraft structures. The object of research in this work is three-layer panels of variable stiffness loaded with longitudinal compressive forces. The purpose of the work is to evaluate the overcritical behavior of the specified panels when geometrically nonlinear relations are used. The variable parameter of three-layered panels in the case under consideration is the height of the rigid filler, which varies linearly. An analytical solution of the problem of determining the stress-strain state by the Bubnov-Galerkin method is given. The deflection of a panel is represented by two terms, and the problem is reduced to the solution of a nonlinear system of two unknown equations with respect to the values of the deflection amplitudes. Analytical expressions for calculating membrane stresses are given. The practical significance of the work lies in the possibility of estimating the overcritical behavior of a three-layer panel of variable stiffness under compression and the possibility of constructing an algorithm for the optimal design of the panels.
Computer application of the kinematics control system for a virtual stretch-tightening press RO-630-11
Authors: Mikheev V A , Alvarenga Roberto de , Demidova M M
Published: November 2021

A computer application of the control system for the virtual display of a real stretch-tightening press RO-630-11, taking into account its kinematic features, has been developed. The focus is on the research carried out by the finite element method in modeling the processes of shaping a sheet blank by a tightening punch, with a surface oriented relative to the curvature lines and placed on the table of a virtual stretch-tightening press RO-630-11.
Influence of the circumferential speed of the spiked cylinders on the efficiency of cleaning raw cotton
Authors: Rajabov Ozod , Salimov Shukhrat , Temirov Azamat , Yokubov Mukhriddin
Published: November 2021

The article examines the dependence of the speed of rotation of the spiked cylinder of the machine for cleaning the raw cotton from fine impurities on the cleaning efficiency of the machine by different varieties. In addition, the article plotted the speed of rotation of the spiked cylinder as a function of mechanical damage to the seed. Based on experimental studies, the operation of the machine for cleaning cotton raw materials from fine contaminants is based. Experimental studies on raw cotton of medium and fine fiber varieties of hand and machine cotton picking on the value of constant and differentiated peripheral speeds of cylinders fully confirmed the theoretical conclusions. It is recommended to use a differentiated high-speed mode of rotation of the spiked cylinders: When cleaning medium-staple cotton - 10:11:12 m/sec, when cleaning fine-stapled cotton - 9:10:11 m/sec.
Abrasive resistance of polyetherurethane ureas
Authors: Senichev V Yu , Pogorel’tsev E V
Published: November 2021

The relationship between the structure of the polymer chains and the abrasion resistance of segmented polyurethane ureas based on polyoxytetramethylene oligoether was studied. Experimental data were obtained for systems with the hard segments content above 39%. It was found that the function of the volumetric wear of polyurethane-urea samples on the content of hard segments had an extremum; at high contents of these segments (more than 35%), a further increase in this content lead to a deterioration in the abrasion resistance. The reasons for this effect can be associated with a sharp deterioration in the strength and strain properties of the studied elastomers when additional amounts of diisocyanate are introduced into the system, which can lead to the formation of excessive interchain bonds.
Performance improvement methods of hydroficated machine under refrigeration
Authors: Kaverzina A S , Lunev A S , Karnaukhov I V , Pankiv M D , Andreychikov I V
Published: November 2021

In this paper, the problem of the influence of climatic conditions on the performance of a Hydraulic gear is considered. The importance of the work is due to the fact that the methods for solving the problem are proposed, namely, the use of preheating for a Hydraulic gear and an internal combustion engine under refrigeration. The use of hydrofected self-propelled vehicles in the northern regions in winter is considered. The factors determining the technical and economic indicators of hydrofected machines are revealed. The influence of negative temperature on the physical and mechanical properties of hydraulic equipment materials is also considered. Three main directions have been identified in which temperature affects the hydraulic drive. An experiment was conducted in which the dependence of the performance of the machine was revealed using a preheating device for the working fluid and without the device.
Methods to improve hackles in the production of quality yarn
Authors: Kazakov Farxot , Rajabov Izzatulla , Umirov Jamshidjon , Ruziyeva Dilafruz , Aripova Aziza
Published: November 2021

The article covers the analysis of work members and mechanisms of hackles, substantiation of technical parameters and modes of operation in order to improve the quality of yarn, to eliminate thread irregularities, to reduce thread breakage and defects by changing the hackling segments and supply table spacing. The work members of the hackles, the traction forces of the roving and the hackle, as well as the productivity of the machine are theoretically determined. The hackling level indicates the thickness of the fiber layer on the surface of the main drum, or how many fibers fit into a single headset tooth. By varying the spacing between the receiving drum and the supply table, the fibers are better hackled, the degree of hackling increases - the higher the quality of the hackle and the effect on the quality of the roving has been determined theoretically and experimentally.
Robotic wheel structures and their industrial applications based on motion simulations
Authors: Ordoñez-Avila José Luis , Magomedov I A , Bagov A M
Published: November 2021

The following work was done to analyze mobile structures with different arrangements of wheels. Software package Solidworks was utilized in modeling and analysis of the structures. Eight mobile structures were built by rearranging the placement of both driven and free wheels. Each structure has its own unique placement of wheels, hence giving the opportunity to understand the influence of the wheels’ placement on the functionality of the whole structure in terms of speed, stability, and other parameters. Therefore, eight mobile structures were analyzed, and the results were gathered. Adding more driven wheels or free wheels does not improve the performance of the mobile structures. The outcomes of the results illustrated that structure 6 tends to be more positive in terms of energy consumption, torque, and stability. Hence, adding more driven wheels does not improve the performance of the mobile structures.
Analysis of alternative motor-vehicle fuels
Authors: Kovaleva M A , Shram V G , Vinichenko T N , Kravtsova E G , Slashchinin D G , Matkerimov T Y
Published: November 2021

In this paper, the analysis of alternative fuels is carried out: electricity, hydrogen, biofuels (bioethanol, biodiesel, biogas), solar energy, compressed air, gas engine fuel (compressed natural gas, liquefied petroleum gas, liquefied natural gas). The advantages and disadvantages of their use are indicated according to the criteria of environmental safety, cost, and infrastructure development. It is revealed that at the moment, gas-engine fuel, in particular liquefied petroleum gas and compressed natural gas, is most suitable for the transfer of the fleet. The economic and environmental effect of the market expansion is associated with the high environmental friendliness of this type of fuel, low price, large natural reserves, the development of the petrochemical industry of the country, the reduction of financial costs for the repair and reconstruction of physically and morally outdated oil refining and liquid fuel production enterprises, promising technical and technological solutions to transport problems.
Automation of technological processes in the examination of core samples
Authors: Morev A V
Published: November 2021

Currently, there are quite serious problems in the methodology of conducting petrophysical studies. These problems have a significant impact on the process profitability of obtaining analysis results. Improving the efficiency of laboratory analyses is an important direction towards enhancement of the methodological approaches used in the laboratory practice. Automation of the process of recording the volume of water displaced from the chamber of a group capillarimeter while determining the water saturation of standard and full-size core samples is analyzed.
Calculation of the components of the temperature measurement error by a resistance thermocouple of an installed unbalanced bridge
Authors: Leonov A , Shkaruba N Zh , Temasova G N
Published: November 2021

The article has devoted to solving an urgent problem related to the determination and calculation of the components of the temperature measurement error. A grain drying machine had selected as the object of research, in which the temperature of the grain at the exit from the machine is measured with the help of a Cu50 resistance thermocouple installed in an unbalanced bridge. It had found that the scale of the measuring device, calibrated in degrees Celsius, will have a nonlinearity error, which increases towards the end of the measurement range. For the Cu50 resistance thermocouple installed in the grain drying machine, when measuring the temperature in the range of 0 … 100 °C in absolute terms, the nonlinearity error was 0.3 mA, in relative terms - 4.4 %, which is quite large. The measurement error has calculated with a tolerance for the nominal resistance of the thermistor ± 0.1 Ohm, which in the given form was 0.5%. The resulting value indicates that this component will have an insignificant effect on the total measurement error. The measurement error due to the supply voltage drop by 0.2 V in relative form was 4.2 %. Thus, the voltage drops when using an unbalanced bridge will have a significant effect on the measurement result.
Morphological properties of peroxidic pulp from hemp bonfire
Authors: Pen R Z , Shapiro I L , Chendilova L V , Marchenko R A
Published: November 2021

The bonfire (Cannabis sativa) was delignified with the reaction mixture “acetic acid - hydrogen peroxide - sulfuric acid catalyst - water” at a sulfuric acid concentration of 0.45%, a liquid module of 6, and a temperature of 85 °C. The effect of cooking conditions (hydrogen peroxide concentration and process duration) and mass grinding up to 34 … 36 °SR on the morphological properties of technical cellulose fibers - length, width, degree of inhomogeneity (polydispersity) - has been studied. Hemp fibers are inferior in length to those of spruce wood and wheat straw, but more uniform. The widths of hemp and wood fibers are almost the same. Due to its high strength characteristics, peroxide cellulose from bonfire is suitable for use in composition with other fibrous semi-finished products in the production of mass types of paper and cardboard products.
Effect of pulp consistency during refining on physical and mechanical characteristics of handsheets
Authors: Ushakov A V , Alashkevich Y D , Kozhukhov VA , Marchenko R A
Published: November 2021

At the moment, the pulp and paper industry produces a wide variety of types of paper and board, which can serve as an alternative to plastic packaging products. The main requirement for paper packaging is high strength properties, which include: breaking length, resistance to breaking, bursting and tearing. The required strength properties can be ensured at the stage of refining the semi-finished product from which the paper product will be made by changing the consistency of the pulp. Since the influence of the consistency of the pulp during refining on the strength characteristics of the finished product has not been fully studied, it was of interest to find out how the strength properties of castings change when refining the pulp with a change in concentration.
Mathematical models of magnetic circuits of a magnetomodulation DC converter
Authors: Ataullayev N O , Nizomova D F , Muxammadov B Q
Published: November 2021

Monitoring of the operation mode of autonomous power supplies with magnetically modulating DC converters and system control, differential sensitivity, improve accuracy and reliability and monitor its static characteristics in the form of a line graph.
Heating of natural gas before expander - generator unit
Authors: Mukolyants A A , Sotnikova I V , Ergasheva D K , Shadibekova F T , Taubaldiev A A
Published: November 2021

The article discusses the replacement of throttling at the stations of technological lowering of the pressure of main natural gas by an expander-generator technology that allows the production of a cheap one with high environmental indicators. The disadvantage of this method of generating electricity is a significant cooling of the gas at the outlet of the expander, which necessitates its heating. The efficiency of the expander-generator set is largely determined by the adopted gas heating scheme. Achieving such heating temperatures is possible only by using high-potential energy resources, which are present in the technological equipment of gas distribution stations in the form of gas heaters with an intermediate heat carrier, designed to heat gas before expansion. Calculations of the amount of fuel gas required for heating the main natural gas in front of the expander-generator unit at the gas distribution stations under consideration have been carried out. The results of the study of the influence of the temperature of gas heating in front of the expander on the consumption of fuel gas supplied for heating and the numbers of heaters are presented. An analytical dependence of the electric power of the heat pump installation on the difference between the total power consumption of the compressor and the power of the air turbine is obtained.
Analysis and study of energy efficiency by the operation of a voltage stabilizer
Authors: Karimov R Ch , Kuchkarov A V , Xodjalimova M Z , Makhamadjanov R K , Numonov A B
Published: November 2021

This article discusses the analysis and study of the energy efficiency of the operation of a voltage stabilizer using a non-contact voltage relay. In addition, the calculation of the energy efficiency from the use of the stabilizer is presented on the example of the enterprise of the Baysun district power supply of the Surkhandarya region. Summarizing the results of the analyzed and investigated energy efficiency of the prototype of the stabilizer, it can be stated that it fully meets the requirements for such devices and can ensure reliable operation of the power supply network of household electrical receivers with a voltage of 0.4 kV.
Gas-air mixture explosion behaviour research at different temperatures
Authors: Klochkov S V , Minkin A N , Edimichev D A , Krekhov A A , Chistova E V
Published: November 2021

This article discusses gas-air mixture explosion properties depending on its initial parameters. Authors use the heat flow control sensor to obtain the most dangerous concentration range at normal and low temperatures. The dependences of heat flux changes at initial moment of explosion under different conditions are analyzed. The survey setup was a plastic bag filled with a gas mixture. Experiments were carried out with (without) holding the substance and with (without) using the turbulators. The reliability of acquired data was assessed by running a tenfold repetition of each test bench under identical meteorological conditions.
Neuromorphous structures of the adaptive control for technological modules
Authors: Sizykh Viktor , Daneev Aleksei , Daneev Roman
Published: November 2021

The article develops a scientific direction, which is based on the organization of the functioning of a complex technological process according to the rules of a simple, well-studied TP based on the methods of the theory of investment. The main thesis of embedding theory: comparison of complexly organized multiply connected physical systems with relatively simple, well-studied systems. TP in this case is a multi-agent system consisting of a set of parallel TMs - single-layer neural networks with a given topology of connections between agents.