bluuebunny/crossref_metadata_2025 huggingface dataset:
Soil strengthening using fine composite binder based on carbide slurry
Authors: Panchenko A I , Kharchenko I Ya , Mirzojan M
Published: December 2020

It is shown that increasing the strength and impervious properties of strengthened soil massifs, keeping at the same time the low cost, is possible by use of injecting compositions based on the fine composite mineral binder – bio-silicon oxide together with the carbide slurry. The carbide slurry has fine particles size less than 10 μm. Aqueous suspensions based on bio-silicon oxide with the carbide slurry have required workability due to low viscosity and sedimentation of not more than 1.2%. Such suspensions had a sufficiently good penetrating ability and allowed transforming of the sandy soil into ground concrete in 28 days. Strength values of 12.5 MPa and 11 MPa were achieved using lime and carbide slurry, respectively. A distinctive feature of the carbide slurry application is that it is a waste product It also solves the environmental problem.
Burnout resistance assessment of air tuyere in blast furnace
Authors: Skripalenko M M , Kobelev O A , Sayfullayev S D
Published: December 2020

To assess the burn resistance air tuyere in blast furnace using the finite element method (axisymmetric problem), DEFORM-2D software was used. Ceramics with a slurry coating applied to it was used as thermal insulation for protection against air tuyere burnout. The resistance to air tuyere burnout with the selected thermal insulation on its outer surface is estimated by calculating the stress intensity.
Searching for a rational schedule of a burnishing process with superimposition of ultrasonic vibrations
Authors: Martynov E M , Zhelezkov O S
Published: December 2020

An ultrasonic finishing treatment unit was used for experimental researches to find effective burnishing modes. Based on the research findings of an obtained surfaces microtopography the following parameters were determined: Ra – arithmetical mean deviation of the profile and Pc – average number of profile end points per 1 cm of the surface length, by which the quality of treatment was evaluated.
The quality study of composite galvanic coatings, obtained using electroerosive powders
Authors: Ageeva E V , Khardikov S V , Altukhov A Yu , Novikov A N
Published: December 2020

Actual is the task of creating the so-called composite galvanic coatings (CGC), introducing hardening additives in the form of finely dispersed powder into the solution. During the experiments, a coating was applied using a standard composition, and then a coating with the addition of EED powder in an amount of 5 g/l of solution. The microstructure of the obtained coatings was investigated using a Quanta 200 3D scanning electron microscope. Testing the hardness of the samples along the transverse section was carried out using the DM – 8 automatic microhardness analysis system. It was experimentally established that the composite galvanic coating has a clear boundary with the substrate and a transition friable layer of up to 30 μm. In this case, the presence of vertical cracks up to 50 μm in size was noted. It was shown that a composite coating obtained with the addition of an electroerosive powder in an amount of 5 g/l of solution has a microhardness 12% higher than a coating using a standard electrolyte composition.
Calculation on seismic resistance of box-shaped structures of large-panel buildings
Authors: Usarov M K , Mamatisaev G I
Published: December 2020

The article is devoted to the theoretical calculation of the box-shaped structure of large-panel buildings on dynamic effects, taking into account the spatial work of transverse and longitudinal walls under dynamic effects, set by the base displacement according to a sinusoidal law. The problem is solved using the finite difference method.
Morphology features of molybdenum carbide synthesized by DC arc discharge plasma in air
Authors: Vassilyeva Y Z , Pak A Y , Yakich T Y , Mamontov G Y
Published: December 2020

This paper presents the XRD and SEM analysis results of molybdenum carbide powder synthesized by DC arc discharge plasma in air. The regularities of the phase composition distribution in the reaction zone are revealed. It was determined that in the arcing zone the initial molybdenum is completely processed, the hexagonal molybdenum carbide has the greatest yield. As a distance from the arcing zone increases, the fraction of cubic molybdenum increases, orthorhombic molybdenum carbide and graphite phases decreases. According to SEM data, the features of element composition and morphological types of samples collected from different parts of the reaction zone were revealed.
Optimization of technological modes for moulding composites using vacuum infusion technology
Authors: Maung Pyi Phyo , Thant Kyaw Phone , Malysheva G V
Published: December 2020

The aim of this study is to optimize the resin infusion time of carbon fiber reinforced plastic laminates depend on temperature gradient using vacuum infusion technology. At room temperature the resin infusion time of moulding large composites part cause production slowly. So the infusion time must be considered in the production of large composite part. We can decrease the resin infusion time by heating the mould with greater temperature logically. But there will be thermal damage in finished composites product. In this paper we studied the resin infusion time and proper temperature gradient without losing its composites properties. This study leads to the development of rapid production in vacuum infusion technology.
Models of intelligent CAD in engineering divisions with training elements
Authors: Burdo G B , Bolotov A N
Published: December 2020

The paper considers one of the issues of automated process control system for machining processes. The proposed approach is based on the implementation of such elements as the information accumulation, analysis, generalization, and knowledge elicitation. Such method allows creating new technological patterns, so it means that there are some elements of artificial intelligence in an automated system. The signs that form new knowledge are identified signs that correspond to a certain level of technological process decomposition. In order to increase the reliability of obtaining quality solutions, it is planned to involve experts for the most critical situations. Currently, the proposed method is undergoing experimental testing.
Determination of maximum productivity the technological system of multi-product chemical plant
Authors: Karpushkin S V , Krasnyanskiy M N , Malygin E N , Mokrozub V G
Published: December 2020

The mathematical formulation of the problem to determining the maximum productivity of a fixed hardware design for a technological system of multi-product chemical plant for a specific product is proposed. The algorithm for solving this problem involves checking and ensuring that the conditions for the suitability of the apparatus stages of the system for processing batches of the specified product are met. An example of the problem solution for a specific multi-product chemical plant is given.
About one method of modeling high-gradient temperature fields in the welding of shell structures made of carbon and high-alloy structural steels
Authors: Mironova L , Nigay R , Nigay E
Published: December 2020

A method is proposed for modeling high-gradient temperature fields in welding processes of shell structures made of carbon and high-alloy structural steels based on the graph-analytical method for studying the behavior of a function determined by the differential heat equation. The method consists in approximating a family of interpolating cubic splines constructed from temperature measurements at the reference points of the welded contour during the welding process. The analytical dependences of the distribution of temperature fields due to the design features of the welded joint and the welding process are obtained.
Dynamics of the beam laying on the elastic basis of the Pasternak model carrying the moving constant load
Authors: Erofeev V I , Lisenkova E E , Malkhanov A O , Tsarev I S
Published: December 2020

A system consisting of a guide along which a heavy mass moves is considered. A guide is considered to be a homogeneous beam lying on the elastic base of the Pasternak model. The features of bending wave generation by a moving load are studied. Based on the general solution of the problem, an expression is obtained for the pressure of the waves (the forces of resistance to motion).
Target training of technologists in a virtual enterprise environment
Authors: Cherepashkov Andrey A , Voronin Valeriy N , Sharaukhova Anastasiya G
Published: December 2020

The article discusses the project personnel’s problems of CAD training integrated into complex automated systems. To accelerate adaptation and development of CAD skills among users of CAD systems in a digital design and production environment, specialized educational and research virtual enterprises (ERVEs) are created. The target training of engineering technologists is considered in detail. The structure and composition of means of informational and methodological support of ERVEs are substantiated. The use of ontological analysis for constructing optimum trajectories for training specialists in a virtual educational environment is proposed.
CAD-technology is a tool for teaching bachelor students industrial technology
Authors: Danilova E A , Antropova T V , Skotnikova A A , Borodulina S V
Published: December 2020

The vast majority of special disciplines in technical fields are studied bachelor students over one semester. This time is not enough for developing comprehensive knowledge of industrial technology and product forming processes. In addition, visit to training machine laboratories does not always allow student to fully explore the features of a particular technological process. As a problem solution, students may use CAD-technology in practical classes for computer simulation of various technological processes. Methods for solid body model constructing should correspond to the workpiece forming method in production environment. Such tasks would allow students to understand better the technology and features of manufacturing workpieces on different machines. This is especially important in the conditions of distance learning, when students have no opportunity to personally visit industrial laboratories and perform work on special equipment.
Simulation of operation of a flow sensor of variable pressure differential
Authors: Kharitonov Alexander , Busigina Elena , Nikitina Olga , Maslennikov Ygor
Published: December 2020

In operation the results of study of influencing of uniform depositions and residual deformations of a diaphragm are introduced flow sensor of variable pressure differential on magnitude of coefficient of the expiration. The results are obtained by a numerical modeling of operation of the sensor by finite element method with usage of the program Ansys. The move of air in the channel of a constant cross-section was modeled. Statistical treating and analysis of the obtained results are fulfilled by facilities of the program Statistica Enterprise. The quantitative estimation of influencing of each of the indicated factors on magnitude of coefficient of the expiration is given.
A study of the cultivator suspension’s strength based on its solid model in Autodesk Inventor Professional
Authors: Telegin V V , Telegin I V
Published: December 2020

The article is devoted to the study of the stress-strain state cultivator suspension in the Autodesk Inventor Professional program. To solve this problem, a solid-state suspension model has been developed. Four schemes of the application of external forces and restrictions on the suspension parts movement are described, which describe the condition of the cultivator in critical situations - the suspension’s paw clings to an obstacle. The calculations were performed in the “stress analysis” environment. The obtained results made it possible to justify the possibility using two of the four considered schemes to formulate a plan for a comprehensive study of the cultivator’s health when various changes are made to its design. The ultimate goal of design changes is to reduce metal consumption and the use of more affordable materials in the manufacture of the cultivator frame.
Analysis of industrial performance in terms of achieving quality goals
Authors: Anikeeva O V , Ivakhnenko A G , Storublev M L
Published: December 2020

An approach is developed to analyze the results of the industrial enterprise in terms of achieving quality goals. The results of approbation of the developed approach are presented on the example of ZAO NPP ‘ANA’ (St. Petersburg). Based on the mathematical models created earlier by the authors, stability conditions are obtained depending on the values of the parameters of the enterprise quality management system, which enables to solve the problems of managing the state of this system as a subsystem of general management. For the study, the following were used: apparatus of the automatic control theory, Data Mining methodology, and elements of a Balanced Scorecard.
Formation and selection methodology of digital transformations programs for an industrial enterprise using machine learning algorithms
Authors: Lukina S V , Makarov V V , Dobrolyubova M F , Krutyakova M V
Published: December 2020

The article developed a Methodology for the formation and selection of digital transformation programs of an industrial enterprise using machine learning algorithms. The method allows creating a set of valid alternative options for digital transformation programs for the production activity of an industrial enterprise by a set of workarounds for a multilayer graph model. The choice of the optimal program is carried out by assessing the weights of the workarounds of the graph by a set of Key Perfomance Inticators (KPIs). The method is based on the presentation of the structure of an industrial enterprise by weighted oriented graphs which determine the structure of a neural network, and its subsequent training on arrays of source information. Each hidden layer of the graph model determines any component of the production structure of the enterprise, and the neurons in them are the components of this structure. As a basic part of the digital transformation is determined a automated workstation and a cyber-physical system. The PyTorch library for the Python 3.8 programming language is used as the main tool for implementing the method.
Operational control algorithm of parameters of high-pressure sodium lamps based on a statistical time series model
Authors: Semenov A D , Volkov A V , Shchipakina N I
Published: December 2020

The developed operational control algorithm parameters of a high pressure sodium lamp is considered in this work. We used a mathematical model to develop the algorithm. An analytical method was used to describe the operation of a sodium lamp based on differential equations as well as an algorithm for evaluating time series. The mathematical expectation and dispersion were also evaluated. The described models for quality control of sodium lamps have been tested in production. The obtained simulation results coincide with the results of the experiment. Using a series of tests based on the proposed control method we confirmed the adequacy of the developed model.
On reqularization and vector optimization of machine design variables
Authors: Matusov L B
Published: December 2020

The correct determination of the feasible solutions set and the set of Pareto-optimal solutions are the most important in engineering optimization problems. To create a machine with optimal parameters, you need to know exactly the boundaries of the feasible set on which to search for these parameters. And to claim that the resulting machine design is optimal, we need to approximate the Pareto set with the necessary accuracy. To create a feasible set the method of obtain his constrains was proposed. Earlier, the results of our research on determining the rate of convergence of this method and approximation of feasible set of solutions were solved. In this paper, the problems of approximation and regularization Pareto optimal set are solved. Due to the fact that the set of Pareto-optimal solutions is not stable, even small errors in calculating the values of the system performance criteria can significantly change this set. It follows from this that, approximating a feasible solutions set with a given accuracy, we cannot guarantee approximations of the Pareto set. Such problems are called ill-posedaccording to Tikhonov. In these case reqularization of the Pareto-optimal set is a solution of these ill-posed problem.. To get a complete solution to this problem, acceptable for most practical tasks, is quite difficult. In this paper, this problem is solved for criteria that satisfy Lipschitz condition. The results obtained here are not only theoretical in nature, but are already used in the design and identification of parameters of mathematical models of machines.
Deformations and casting defects depending on the gating system for gas turbine engine castings
Authors: Inozemtsev A , Dubrovskaia A , Dongauzer K
Published: December 2020

The article covers researching the processes of pouring, crystallizing and cooling to room temperature, while simultaneously solving the related task of the stress-strain behaviour of the casting process in course of the heat-protective panels manufacture. The influence of the technological parameters of casting onto the development of the deformation defects was evaluated. The works were performed on incorporating predeformation into the burn-out model for compensating temperature deformations during casting, and on production and control of the above casting with predeformation.
Digital enterprise comprehensive evaluation
Authors: Polyanskov Yu V , Yardaeva M N , Lipatova S V , Lutoshkin I V
Published: December 2020

The article presents a method for a comprehensive evaluation of the activities of an aircraft building enterprise. Based on an integral presentation of management principles ‘just in time, risks management’ and ‘design to cost, risks management’, an assessment of the required quality and volume of production is proposed, considering the aggregated nature of indicators and the heterogeneous structure of the enterprise. An automation algorithm for the developed method is described. The methodology for implementation and use of the tool for comprehensive assessment of the aircraft building enterprise is presented.
Calculation and design of mechanical transmissions with the help of various computer-aided design in conditions of educational process
Authors: Kurasov Dmitry
Published: December 2020

The field of application of computer-aided design (CAD) is an integral part of the design of real-world products of construction, lifting-and-transportation, road vehicles, as well as the design of electronic products. Computer-aided design allow you to solve the most time-consuming and time-consuming tasks, carry out calculations, help you to represent the most accurate visualization of an object (3D visualization). The calculation and design of mechanical transmissions using CAD, which form the basis of most working machines, is an important component of the educational process in the training of future specialists in technical areas. In this work, some modules of computer-aided design have been analyzed to apply them to the educational process in the calculation of mechanical transmissions.
Applicability of statistical modelling in problems of cardiopulmonary resuscitation device’s state control
Authors: Osipov K , Krugovoy A , Novikov V
Published: December 2020

The methods of experimental study of complex machines cardiopulmonary resuscitation are developed. They involve the statistical modeling of the tested objects on the basis of technical parameter values and adaptive filtering, utilizing Kullback-Leibler information measure as a criterion of the state estimation. The measuring information on technical parameters obtained during their tests is analyzed as an example.
Multi-operation machine with tool redundancy as a two-component recoverable system with instantly replenished time reserve
Authors: Peschansky A , Kharchenko A , Yagyaev E
Published: December 2020

The object of the research is the technical system of a multi-operation machine tool, the tools of which can fail and be restored. The failed tool remains functional for some time due to a temporary reserve until a parametric failure occurs, the magnitude of which is random. All random variables describing the system have general distributions. The apparatus for constructing a mathematical model of the described system is a semi-Markov process with a discrete-continuous phase space of states. The stationary distribution of the embedded Markov chain is defined explicitly. For systems with parallel connection, the stationary time between failures of the system, the stationary time spent in the state of failure and the stationary system availability factor are found by the series of connections with disconnection and without disconnection of elements. The dependence of the stationary characteristics of the system on the size of the time reserve is demonstrated with a numerical example.
The Blagonravov Continuously Variable Transmission: importance of internal force functions for torque transforming
Authors: Yurkevich A V , Tereshin A V , Soldatkin V A
Published: December 2020

It is shown that the use of properties of the potential force field generated by the elastic forces to transform mechanical energy enables us to provide infinite kinematic and significant power ranges of mechanical transmission. An example of a kinematic diagram of the Blagonravov continuously variable transmission implementing this method is given. It is shown that the use of elastic forces in a continuously variable transmission with kinematically provided oscillatory motion of internal links in combination with mechanical rectifiers provides in the stop mode of the transmission the energy return to the drive motor while maintaining a significant moment on the transmission driven shaft. The mechanism of formation and the role of power functions in the transformation of the moment are described. The possibility of independent control of power functions and the rotational speed of the drive shaft of the transmission is shown. This property is fundamental and practical.
The influence of the hardening curve of a material on the results of torsion tests of notched specimens
Authors: Erpalov M V , Pavlov D A
Published: December 2020

The article is devoted to the study of rheological properties of metals and alloys in a hot state. A method for torsion testing of materials is considered. It is known that the strain heterogeneity is observed along the gauge length of cylindrical specimens during torsion. Its value can reach several tens of percent, depending on a material and the quality of specimen preparation. Therefore, torsion tests are often carried out on specimens having a notch of a certain shape. In this work, the method of finite element modeling is used to study the effect of the hardening curve of a material on the strain distribution along the gauge length of specimens with a circular notch, as well as on the strain evolution in the minimum section of the notch. Using 12Kh18N9T steel and VT–16 and VT–33 titanium alloys as an example, three different variants of a hardening curve are considered, namely, monotonic hardening, monotonic softening, and also the curve with a local maximum of stress. The results of the study have shown that the stress-strain behaviour of a material has a significant effect on the strain distribution along the notch length of the specimen. In addition, the dependence of the strain value in the minimum cross-section of the specimen on the twist angle cannot be predicted. It makes difficult to control a test setup when it is necessary to provide accurate strain rate values during the test. The use of notched specimens for torsion testing requires the development of new automatic-control systems for changing the strain rate values in the minimum cross-section of the notch according to a specified time law.
An algorithm for controlling the visco-elasto-plastic model for studying shock interaction processes
Authors: Lapshin V , Zenkov E
Published: December 2020

In engineering practice, dynamic processes are crucial. Therefore, modeling and research of these processes are urgent tasks. To study the shock processes, a mechanorheological visco-elasto-plastic model was developed. An important parameter of the model is a force corresponding to the occurrence of plastic deformations. An improved algorithm and a new computer program for studying impact processes using the visco-elasto-plastic model with adjustable elastic-plastic transformations were developed. Differential model motion equations were built. The conditions of transformations were studied for the transition from elastic to plastic deformations, from the loading stage to the unloading one. Functions of the model were described, an algorithm of the model was developed and described.
Vibration and impact properties of magnetorheological elastomers
Authors: Minaev A Ja , Korovkin Ju V , Valiev H H , Stepanov G V
Published: December 2020

The paper describes experimental research into the dynamic properties of magnetoactive elastic polymers. Tests on a vibrostendshow that in certain ranges the test material is able to change the frequency of resonance vibrations under the influence of magnetic fields. Experimental data obtained during testing a sample of magnetorheological elastomer under the load produced by an unbalanced rotor of an electric motor are presented. The results of impact load action are shown.
Hydropress assembling automation of interference fits with steel and titanium parts
Authors: Romanov A V , Shchenyatsky A V , Petrov A V
Published: December 2020

The main aspects of assembling automation of hydropress connections are considered – increasing the assembling performance, its stability and ensuring the quality of hydropress connections. A control system for the technological complex of hydropress assembling on a base of fuzzy logic methods has been developed, it provides the control of technological assembling modes, including: pressing speed, oil pressure, control of the force and pressing length, without identifying the parameters of assembling process, as well as the guaranteed presence of liquid friction in the non-linearity conditions of assembling process. The structure and control algorithm of automated hydropress assembling that ensure the maintenance of the working oil pressure during assembling are proposed. The algorithm is based on a set of feedbacks: pressure and position sensors, that provides a qualitative transition from boundary to liquid friction. A prototype of the technological complex of hydropress assembling of interference fits has been developed, that allows to assemble joints with a coupling diameter up to 50 mm in an automated mode. The results of experimental studies of automated assembling of steel and titanium joints are presented.
Practical aspects of constructing a specialized control system for compact machines
Authors: Nikishechkin P A , Kovalev I A , Kazaryan O V , Grigorev N S
Published: December 2020

In the presented article is considered the task of constructing a specialized system for implementing numerical control of various compact machine solutions that allows to process wood or metal or create parts from model plastic based on additive technologies. The control system must be flexible and, by its principles of construction and programming, be close to classical CNC systems, but not possess excessive functionality and corresponding price. The development of such compact machine-tool solutions will make it possible to use them both for small productions and for training specialized specialists in working with numerical control systems and in their programming.
Questions process simulation of metal forming
Authors: Novokschenov S L , Yatsenko S N , Milushev E H , Shibaev P B
Published: December 2020

Today, enterprises are faced with the problem of reducing the terms of design and technological preparation of production, which ultimately has a significant impact on the cost of production. In reducing time, CAD / CAM / CAE systems and CAD processes help today. In this regard, the aim of the article is to develop a model that allows you to choose the main technological equipment with a sufficient degree of reliability for hot forming processes. Research method, finite element method, which is used to analyze the stress-strain state of the forging. The results of the study are expressed in the obtained dependence, which allows you to choose the main technological equipment by weight of forgings. The conclusions obtained from the study are based on multivariate calculations by the finite element method for forgings of varying degrees of complexity, covering the most common range of crank hot stamping presses with a nominal force of 6.3 to 40 MN. The practical significance of the research results is to reduce the time of design and technological preparation of production by 15%. The proposed methodology and / or its results can be applied at enterprises engaged in the manufacture of parts by metal forming.
Development of a method and decision support system for distributing orders of a machine-building enterprise
Authors: Medvedev Stepan , Aksyonov Konstantin
Published: December 2020

The efficiency of the machine-building enterprise depends on the efficiency of management decisions at all levels, which affect the implementation of production orders, rational use of production resources. The use of modern information technologies which are based on mathematical methods allows you to make the right management decisions in a timely manner to improve the efficiency of the enterprise.
Hybrid device for automatic assembly
Authors: Vitliemov Pavel , Markov Krasimir
Published: December 2020

This paper presents a hybrid device for experimental investigation of the possibilities for enhances of the assembly processes’ quality. The developed hybrid device provides a successful running of the assembly, surmounting certain errors in the positioning of the parts and fending from breakage situations during wedging and jamming of the assembled parts. In the paper is presented in detail the device’s control system as two levels hierarchical structure.
Tracking of small-sized air objects
Authors: Filatov V I , Popov A M , Valiyev R M , Sidorov D E
Published: December 2020

Modern capabilities of tracking air objects are developing at a rapid pace. The article proposes a method for detecting and identifying small-sized air objects during their tracking.
Investigation of cylindrical hydrocyclone for emulsion separation
Authors: Valeev S I
Published: December 2020

Experimental studies of velocity and pressure fields in a cylindrical hydrocyclone to separate emulsions with a low content of light impurities (not more than 1%) are carried out. The obtained data enable us to conclude that in a cylindrical hydrocyclone optimum conditions for the separation of liquid particles are provided.
Diversification instruments for machine-building enterprises
Authors: Prilutskaya M A , Murukina A D , Tipner L M , Kalinina N A
Published: December 2020

Improving the competitiveness of engineering products, import substitution and increasing high-tech exports are priority government tasks. The development of the high-tech products production is ensured through the diversification of engineering enterprises. The study revealed a number of problems that machine-building enterprises are facing when mastering the production of new products. The diversification methods and tools used largely determine the effectiveness of activities throughout the entire product life cycle. The authors consider the value analysis method as a key instrument for implementing the diversification strategy. Value analysis includes a variety of instruments, such as conducting marketing and patent research, reverse engineering, cooperative chain design, and others. The determination of the company’s preparedness for diversification is of particular importance. The article presents an approach to assessing the key functional areas of the enterprise that indicate its preparedness for diversification.
Influence of concentration-time parameters on nitride coatings formation on VT6 titanium alloy and their stability during subsequent treatment
Authors: Gvozdeva O N , Shalin A V , Stepushin A S , Ovchinnikov A V
Published: December 2020

The possibility of using a titanium nitride coating as a «protective» layer against the penetration of hydrogen into VT6 titanium alloy semi-finished or finished products was shown in this article. It was found that the titanium nitride coating does not dissolve during high-temperature vacuum annealing and «isolates» sample sides from hydrogen penetration, which allows to form a linear gradient structure during subsequent thermal hydrogen treatment.
Simulation of the electromagnetic processes in a metallurgical furnace with two bottom electrodes
Authors: Kazak Oleg , Starodumov Ilya
Published: December 2020

The paper presented electromagnetic processes occurring in an ore reduction furnace with two bottom electrodes. The physical and mathematical formulations of the problem are given, as well as the methodology and algorithm for the numerical simulation of the problem.
Numerical modelling of spatial distributions of the pH value and electric field in a liquid electrode
Authors: Askhatov R M , Kashapov N F , Kashapov R N , Chebakova V Yu
Published: December 2020

This paper presents a mathematical model of sodium hydroxide electrolysis with inert electrodes, which allows calculate the amount of gas released, as well as the spatial distribution of the electric field and the pH value.
Technology transfer as a factor in improving the competitiveness of industrial enterprises
Authors: Ahmedova Sibel
Published: December 2020

The publication examines the importance of technology transfer for enhancing the competitiveness of industrial enterprises in Bulgaria. The nature, characteristics and main forms of technology transfer are analyzed. On this basis, summaries of the current state of technological transfer in Bulgarian industrial enterprises are made.
Improving methodology for calculating scaffolding formwork of monolithic slabs in building constructions
Authors: Kondratenko V E , Devyatiarova V V , Albul S V , Kartyshev D S
Published: December 2020

Currently, when designing various residential buildings, there has been a tendency to use monolithic reinforced concrete to cover significant spans. The article proposes the calculation of the outside racks of volumetric scaffold. The bearing capacity of the outside racks is reduced due to eccentric compression of the racks. Alignment of the bearing capacity of the racks provides a span decrease in the placement of outside racks. At the same time, all racks experience central compression and work in the same conditions. This article is a continuation of the paper dedicated to the calculation of volumetric scaffolding of monolithic slab formwork, published in this volume. Article considers the calculation of the outside racks of formwork scaffold, which, in contrast to the intermediate ones, experience bending stresses due to asymmetric load.
Comparative analysis of adaptive systems for automatic stabilization of the water level in the drum boiler
Authors: Livshits M Yu , Igonin I D , Sevastyanov P A , Khapalina A A
Published: December 2020

The comparative analysis of two kinds of adaptive systems for automatically maintaining the water level in the drum of large boilers of thermal power plants is carried out with the stabilization of their dynamic characteristics in the face of changing parameters of the control object. The analysis is carried out with the purpose of determining the most effective adaptation method and development on its basis, a typical local adaptive automatic control system for various paths of energy steam boilers. As a control object, for example, the drum boiler feed circuit is selected because the process of changing the water level in the drum due to a violation of the material balance between water supply and water consumption is the most responsible and complicated due to the astatic type of its transfer function. Both systems are unidentified and contain a reference model in the adaptation loop. The advantages and disadvantages of the analyzed systems and the prospects for the application of adaptation methods laid down based on their construction are established.
Use of convolutional neural networks for segmenting images of roads from satellite
Authors: Seliverstov Ya A , Seliverstov S A , Naryshkin R S , Kripak M N
Published: December 2020

The article developed a technique for using convolutional neural networks for automatic segmentation of roads in images obtained from satellites with a synthesized aperture. The analysis of the subject area and the relevance of this study. The development of a neural network based on U-net was carried out in Python 3x using the libraries TensorFlow, TensorBoard, Pandas, Numpy, Scipy, Matplotlib, Sklearn. The neural network was trained on a training sample of 1200 images prepared by hand marking. The accuracy of the developed model when testing on prepared samples was 68%. According to the results of the study, conclusions were drawn and prospects for further functional development of the developed tools were determined.
Mathematical processing of experimental data of the agricultural working body
Authors: Belousov Sergey V , Belousova Anna I
Published: December 2020

The work is devoted to experimental researches, namely, obtaining a comparative assessment of the quality parameters of the technological process of layer-by-layer soil treatment, in comparison with the serial and proposed working bodies. The article has an analytical character, which is expressed in the fact that the analysis of experimental and energy parameters of an arable unit with various working bodies is given. The quality of the technological process of layer-by-layer tillage with additional working bodies was determined. The conclusions outline the main results achieved so far.
Increasing the mobility of tracked vehicles during curvilineer motion with partial skidding
Authors: Vyaznikov M V , Vyaznikov A M
Published: December 2020

A method for determining the forces and moment of resistance for curvilinear motion of a tracked vehicle on deformable soil is presented. It is assumed that in the patch of contact with the ground, the track performs both rotational and translational motion. Under these conditions, the real law of friction has a fundamental difference from the classical Coulomb’s law. To describe this process, a friction model based on the first-order Pade expansion is proposed, generalized to a flat rectangular contact pattern of the tracked mover with the ground. The determining factor in this process is sliding of the tracked mover relative to the ground. It limits the realizable traction force and the boundary conditions for the adhesion of the tracks to the ground in the contact pattern. The interpretation of these physical processes occurring in the contact pattern, based on the theory of combined friction, makes it possible to use this mathematical model in the structure of the algorithm of an automatic motion control system to solve the problem of controllability in case of partial side skid, which will further increase mobility and maneuverability of tracked vehicles.
Technological support for the durability of the balancing suspension of the car
Authors: Rodichev A Yu , Novikov A N , Gorin A V , Tokmakov N V
Published: December 2020

The article presents an analysis of vehicle suspension failures. One of the main malfunctions is the wear of the rear axle balancer. Dimensional chains are shown that describe the working clearance in a sliding bearing for various types of repairs. Describes how to repair the balancer of the car suspension. The dependence of the wear of sliding bearings on the gap in the pair “sliding bearing - the axis of the balancer” is obtained. A promising method is proposed for reducing the working clearance in the sliding bearing of the balancer of the automobile suspension by applying film antifriction coatings.
Local adaptive road control crossroads
Authors: Kashtalinsky A S , Parsaev E V , Teterina I A
Published: December 2020

Exploring the properties of traffic flow, collecting and processing statistics on the marker indicators and criteria that characterize these properties is an important task on the road to the implementation of adaptive and intelligent traffic management systems in cities. The article provides an overview of the methods and indicators that allow forming a theoretical basis on the patterns of movement of transport on sections of the street and road network. This base is the source of the initial information for the introduction of adaptive control systems at isolated crossroads in urban environments.
Theoretical model of non-linear tire slip
Authors: Abdulgazis A U , Podrigalo M A , Abdulgazis U A
Published: December 2020

The authors carry out the analysis of research studying the phenomenon of slipping of a wheel with a pneumatic tire. It is established that the increase in the slip angle results in the slip coefficient decrease. The values of the slip coefficient for three types of tires are determined experimentally. The previously proposed analytical expression, which makes it possible to quite accurately formulate the nonlinear relationship of the slip angle with the lateral force acting on the elastic wheel, is clarified.
A new approach to assessment of vehicular traction dynamics
Authors: Abdulgazis Aziz , Podrigalo Mikhail
Published: December 2020

The work shows the inaccuracy of the statement that the traction moment on the traction wheel is an internal force and the tangential reaction on this wheel is an external force. The author proves that the rolling resistance moment of the vehicle wheels is an internal force, and the losses caused by this moment should be covered by the transmission efficiency factor. The paper revises the equation for traction dynamics of the translational motion of a vehicle, which can be used in the analysis of its traction-speed properties.
The Air Suspension Synthesis for the Single-axle Transport and Technological Module
Authors: Vetrogon A A , Ostrenko A G , Kharchenko A A , Soustova L I
Published: December 2020

The present paper contains a theoretical justification of composition (assembly of elements or structure) and design of an air suspension of a single-axle transport and technological module. Application of mathematical simulation proves the feasibility of using an independent suspension with air bellows, but without any antivibration devices (shock absorbers). The feasibility concerns the transport and technological module of the proposed design.
The dynamics and strength of the carrying structure of a flat wagon while conducting fire from it
Authors: Fomin O , Lovska A , Kichuk Ya , Urum N
Published: December 2020

The dynamic loading of the flat wagon supporting structure during the military equipment transportation and conducting fire from it is investigated. A flat wagon model 13-401 by the construction of Dniprodzerzhirsk Car Building Plant (Ukraine) was chosen as a prototype. It was taken into account that the flat wagon was loaded with two anti-aircraft systems of muzzle energy of 89 kJ. The accelerations acting on the supporting structure of the flat wagon are determined using mathematical simulation. At the same time, it was taken into account that a simultaneous shot from two anti-aircraft systems is carried out. The solution of the mathematical model was carried out in the MathCad software. It has been found that the longitudinal accelerations of the flat wagon supporting structure were about 36 m/s2, and the vertical ones were about 5 m/s2. The obtained accelerations were taken into account when determining the equilibrium stability of the flat wagon, considering the conducting fire. The stability factor in this case was about 9. The calculation results of the strength of the flat wagon supporting structure are presented. The calculation was carried out in a quasi-static state. It has been established that the maximum equivalent stresses occur in the areas of frontal stops of the automatic coupling and amount to about 300 MPa. The results of the research will contribute to the creation of innovative flat wagon load-bearing structures for the military equipment transportation with the possibility of firing while moving.
Ways to improve the mathematical model of a freight car for the execution of forensic railway-transport expertises
Authors: Batig A , Kuzyshyn A , Sobolevska J , Milyanych A , Hrytsyshyn P
Published: December 2020

According to statistics, receipts of forensic railway-transport expertises related to the derailment of freight wagons annually grows. At the same time, an analysis of the available mathematical models of freight wagons for the study of such cases showed that at present they are not sufficiently detailed to the extent that it is necessary to analyze the causes of rolling stock derailment. Therefore, taking into account the main reasons that occurrence of such railway accidents over the last five years on the railways of Ukraine, the article selects the main directions for improving the mathematical model of a freight wagon. These directions, in turn, should cover the whole plural of factors (explicit and hidden) and identify the most significant ones regarding the circumstances of the derailment rolling stock off the track, established on the basis of a computer experiment. An algorithm and a mathematical model are proposed taken into account the influence on the dynamics of the wagon of process of closing gaps in the axle-boxes and slides, and the equations of motion of the wheelset are supplemented by a guiding force, whose value is one of the main indicators of the stability of the rolling stock.
Mathematical model of a motor-grader movement in the process of performing working operations
Authors: Shevchenko V , Chaplyhina O , Pimonov I , Reznikov O , Ponikarovska S
Published: December 2020

The design features of a motor-grader help it perform a wide range of working operations, which puts it on a par with the main machines in the construction industry. Unlike other earth-moving machines, the motor-grader can perform work operations not only in a cyclic mode, but also in a continuous action mode. Considering these features, not only productivity should be addressed as the main indicator of the efficiency of this machine, but also the indicators of the quality of the working operations performed, in particular, the indicators of road-holding ability in the process of performing continuous working operations. The work has substantiated and developed a mathematical model of the motor-grader movement during working operations. This model makes it possible to predict the expected trajectory of the motor-grader on the basis of deterministic dependencies, which enables to assess the indicators of road-holding ability. The difference between the proposed model and the existing ones is the consideration of a two-stage mode of machine movement: plane motion at the first stage and rotational around the stop point at the second. When describing the external forces acting on the motor-grader, the differences in the formation of resistance forces on the blade during various working operations are taken into account.