bluuebunny/crossref_metadata_2025 huggingface dataset:
Justification of the financing schedule for an enterprise’s innovative project using dynamic programming
Authors: Eremeev D V , Stupina A A , Kukartsev V V , Tynchenko V S , Leonteva A A , Pavlenko A A
Published: November 2020

Get additional profit, increase the profitability of sales, reduce costs - the main goals of any enterprise. To achieve these goals, it is necessary to constantly analyze the available opportunities both in current activities and when investing. The article considers one of the methods for optimizing the investment program by finding the best option for the ratio of cost and time of own and borrowed sources of financing for an investment project. Various forms are considered as additional sources of capital: budget financing, issuing a bonded loan, a credit line, loans from various banking institutions. The results obtained allow us to make balanced management decisions about the structure of project financing. The final data is used to form the overall financial plan.
Simulation and dynamic model of the control process of the lighting system of industrial premises of large areas
Authors: Kukartseva O I , Tynchenko V S , Antamoshkina O I , Markevich E A , Pilipenko A E , Leonteva A A
Published: November 2020

The article presents a simulation-dynamic model of the control process of the lighting system of industrial premises of large areas. The model is based on the system dynamics method, which is widely used in many areas. The presented model of the lighting system includes three levels, two streams, and other variables that are used in the process of its operation. The input interface allows you to enter data into the model using the PowerSim Studio program. This work consists of several elements: the model itself and three graphs that show the results of three experiments with different input data. The results are presented in a table with output data, which is reflected in the program in the output interface and indicates that with a large number of lamps and with the highest values of possible breakdowns, the number of lamps that will stop burning increases. The model is designed for operational management of the system and ensuring appropriate lighting of premises, as well as maintaining inventory and the desired quality of lighting of production premises of large areas.
Realization of APS-planning at custom small-scale manufacturing
Authors: Vinnichenko M V , Noskova E E , Akhmetov R P
Published: November 2020

The main characteristics of a production order as a planning and accounting unit in the manufacture of products with a complex technological composition are considered. Algorithmic implementation of the annealing method is executed as an algorithm APS-planning to get production work schedule of the equipment and loading workplaces enterprise wide with in execution of order, order book, including new orders into an existing one production schedule. The influence of order characteristics on planning results when building a production plan using the developed APS-planning algorithm based on the annealing method is shown. Recommendations to assign control parameters of algorithm for APS-planning with considering production planning results for orders with different characteristics in order to build optimal production plans are made.
The apperception of information in cognitive analysis
Authors: Tsvetkov V Ya , Rogov I E , Kozlov A V , Titov E K
Published: November 2020

The model of apperception of information in cognitive analysis is studied in the article. The content of the holistic image formation is described with highlighting the receiving process (reception) of original perception (perception) and consciousness (apperception). The difference between reception, perception and apperception is shown. The article introduces a new model for the formation of a system image in a cognitive analysis. The content of the cognitive chain of medical information analysis is revealed. Three stages of cognitive analysis are described. The article introduces a new model, i. e. the apperception information model. This model serves as the basis for the formation of an information image in cognitive analysis. This model serves as the basis for diagnostics. Apperceptive analysis and modelling are described.
Distribution law of the percolation threshold in one-dimensional bond problems
Authors: Yakunina T V , Udodov V N
Published: November 2020

A one-dimensional lattice percolation model is constructed for the bond problem at flowing along non-nearest neighbors. Arbitrary parameters were taken (percolation radius, number of nodes in a one-dimensional lattice and number of experiments). Based on original algorithms operating on a computer faster than standard ones, the values of the percolation threshold were obtained with the corresponding error. Based on these data, the hypothesis about the normal distribution of the percolation threshold is tested. Using Pearson’s criterion it was shown for the first time that there is no reason to reject this hypothesis for one-dimensional problems of bonds and sites with an arbitrary percolation radius.
New information technologies in the analysis of electroencephalograms
Authors: Eskov V M , Filatov M A , Grigorenko V V , Pavlyk A V
Published: November 2020

Today, the evidence of the Eskov–Zinchenko effect is becoming increasingly widespread. In this case, it is proved that any set of human body parameters is unique (statistically unique). Now we are also applying this effect to the neural networks of the brain. An analysis of electroencephalograms shows that brain biopotentials are not statistically stable. For the electroencephalograms analysis, it is proposed to create paired sample comparison matrices and find numbers k of the sample pairs that can have one (common) general population. It was found that these numbers k depend on the physiological state of the test subject. For example, for epileptic patients, number k increases dramatically, and it usually does not exceed 30-45% of all 105 pairs in each of such paired comparison matrices.
Application of the modern information technologies for design and monitoring of business processes of transport and logistics system
Authors: Zolkin A L , Faizullin R V , Dragulenko V V
Published: November 2020

The principles and functional diagram of the business processes of the transport and logistics system are presented in the article. Based on these, the use of modern information technologies for the design of business processes and their continuous monitoring is justified. The possibilities and areas of application of the computer assisted platform “AnyLogic” are illustrated. An example of designing of a distribution business process for transport using the cloud-based information system “AnyLogic” is shown.
Impact of data normalization methods and clustering model in the problem of automatic grouping of industrial products
Authors: Ahmatshin F G , Kazakotsev L A
Published: November 2020

We compare the results of splitting batches of industrial products (semiconductor devices) into several prospective homogeneous production batches using the standard k-means and p-median clustering models with various normalization methods. In the case of clustering problems, quadratic Euclidean distances are the most popular. We use them as well as the Mahalanobis distances to calculate the differences (distances) in the normalized space of the industrial product features, and compare the clustering results with the use of the Rand index, and empirically establish the advantage of the p-median model.
Application of various metrics to assess the program code quality
Authors: Gorbachenko I M , Gorshkov E V , Filipkina T N
Published: November 2020

This article discusses the main metrics for assessing the quality of program code. The results of the study of various metrics for assessing the quality of a software product are demonstrated. Previous displays the results of applying different metrics on an example of program code for calculating the values systems s linear algebraic equations Gauss method languages Pascal and C ++. Conclusions on the use of various metrics are formulated.
Prediction of technological process parameters in aluminum production based on artificial neural networks
Authors: Mikhalev A S , Lugovaya N M , Penkova T G
Published: November 2020

The paper presents the theoretical aspects to construct a decision support system for assessing the technical condition and efficiency of the technological process in aluminum production. The key parameters that characterize the technological state of the electrolysis cells include the cell voltage, amperage of anodes and “noise”. This study is aimed at methods of machine learning as it relates to forecasting these parameters. Forecasting relies on recurrent neural networks. The method of maximum accuracy was used to elicit the neural network architecture. The results obtained in the tests run on the suggested model of forecasting are deemed acceptable in terms of predicting the technological process indicators. The introduction of the decision support system into the production management process will allow us to timely detect the technological disruptions and take measures to prevent their occurrence, which in turn will increase the efficiency of aluminum production.
Theoretical explanation of the ultrasonic action pulsed mode on liquid to reduce cavitation
Authors: Golykh R N
Published: November 2020

The article is devoted to theoretical studies of the possibility of reducing cavitation in a medium by using a pulsed exposure mode. A model of the formation and propagation of pulsed ultrasonic vibrations in a liquid is proposed. Pulse shapes are obtained taking into account the distortions arising in the technological volume. On the basis of the identified shapes, the shapes and positions of cavitation zones were calculated, which showed a decrease in the volume of zones in which cavitation bubbles arise under impulse action compared to continuous.
Modeling the spread of pests and forest fires to assess the quality of plant raw materials in the forestry complex
Authors: Marchenko R A , Yarovoy S V , Shurkina V I
Published: November 2020

The Krasnoyarsk Territory and the Siberian region as a whole have the largest reserves of forest resources among the regions of Russia. However, the problem of rational and integrated use of forest resources is becoming more and more urgent. The presence of a large volume of unclaimed wood resources, including in the form of wood damaged by pests and forest fires, requires the development of methods that allow processing such wood using the optimal technology. Such research has been carried out by the scientific laboratory “Deep processing of vegetable raw materials” of the Reshetnev Siberian State University of Science and Technology. For information support of such studies, it is necessary to be able to assess the volume of damaged wood based on the forecast of the dynamics of processes affecting wood, taking into account external control influences. The aim of this work is to develop models and algorithms with which this forecast can be carried out. The article discusses the processes of the spread of pests and forest fires as objects of modeling, examples of such processes are considered. A method for describing the dynamics of distributed processes in the language of classical mechanics, as well as an agent-based simulation model of the dynamics and localization of the processes of the spread of insect pests and forest fires, is presented. The work of the model is based on GIS data and is reflected on a map of the real area. The model uses several types of agents that imitate both the process itself and the fight against it.
Development of the algorithm for graphematic analysis and isolating of semantically significant constructions in poorly structured text
Authors: Rabin A V , Petrushevskaya A A
Published: November 2020

The article presents the results of analyzing the process of detecting patterns in semi-structured and unstructured texts. Text preprocessing is aimed at removing terms that do not carry useful information, bringing the words of the text to a single representation and forming a set of indices of a text information resource - statistical, linguistic, structural. An algorithm for graphematic analysis has been developed as the first stage of automatic processing of texts in natural language. The algorithm makes it possible to single out semantically significant natural language constructions in a semi-structured text using graphematic descriptors, to detect and replace abbreviations and abbreviations.
Towards the structuredness of non-coding regions of chloroplast genomes
Authors: Gorban I K , Senashova M Yu , Sadovsky M G
Published: November 2020

A triplet frequency dictionary is stipulated to be a structure of non-coding DNA fragments of chloroplast genomes. We retrieved the ensembles of the non-coding regions from 391 terrestrial plants and studied the distribution of the fragments in the Euclidean metric space. An interplay between the cluster composition of the set of the dictionaries and the taxonomy of the genome bearers was analyzed.
Hybridization of linguistic and statistical methods of text analysis for describing the subject area in the form of a fuzzy ontology
Authors: Rabin A V , Petrushevskaya A A
Published: November 2020

The algorithm for selection of n-words and formation of a description of the subject area in the form of a fuzzy ontology based on the hybridization of linguistic and statistical methods of text analysis has been developed. The input data of the algorithm are text sequences in machine language, the result of the algorithm operation is the description of the subject area in the form of a fuzzy ontology. The definition of classes of fuzzy ontologies in accordance with the source code is carried out using several machine learning algorithms that combine methods of data preparation and prediction. Methods “Bootstrap”, “Bagging” and “Random forest” were used to classify text sequences. A feature of the developed algorithm is the need to represent ontology objects mainly in the form of one-words with maximization of the number of relations between objects.
Ensembles of optimal binary sequences of length 22n
Authors: Leukhin A N , Bezrodnyi V I , Voronin A A , Merzlyakov A S , Parsaev N V
Published: November 2020

The problem of constructing ensembles of optimal binary sequences of arbitrary period is of great practical importance and urgency, as the electromagnetic spectrum is becoming increasingly congested. The solution to this problem will allow designers of asynchronous wireless communication systems to overcome this congestion, by using ensembles of sequences tailored to their system requirements. This work aims to develop a systematic method for constructing ensembles of sequences with optimal correlation with arbitrary period. Optimality can be strict, or asymptotic, as the period tends to infinity. The problem is of fundamental importance in information theory, with wide-ranging applications to wireless communications, navigation, radar, digital watermarking, and related fields.
Features of application of informational networks in the field of transport infrastructure
Authors: Zolkin A L , Aygumov T G , Aygumov K G , Malikov V N
Published: November 2020

The concepts of universality and general applicability of information networks as well as the issues of using networks in specific directions are considered in the article on the example of the convergence of transport infrastructure and information networks. An analysis of modern information networks has been carried out and the following three main directions have been identified: infrastructure as a service, platform as a service, software as a service. The basic principles of convergence of information networks and transport infrastructure are presented on the example of a transport and logistics system. The issues of use of the modern information technologies for continuous monitoring of transport infrastructure are considered.
Investigation of the problem of classifying unbalanced datasets in identifying distributed denial of service attacks
Authors: Bolodurina I , Shukhman A , Parfenov D , Zhigalov A , Zabrodina L
Published: November 2020

This paper examines the impact of data balancing algorithms in the network traffic classification problem on various types of distributed denial of service attacks on the CICDDoS2019 dataset, which contains information about reflection-based and exploitation-based attacks. The results of computational experiments have shown the effectiveness of data balancing algorithms such as naive random sampling, synthetic minority sampling, and adaptive synthetic sampling in identifying network attacks. A comparative analysis of various data sampling approaches has shown that the adaptive synthetic sampling method with the random forest algorithm demonstrates the highest classification accuracy.
The study of current situation in the development of information and telecommunication networks within the Eastern Siberia territory
Authors: Chuvashova M N , Mylnikova A A , Gorbacheva A K , Druzhinin G V , Moskvitina N V
Published: November 2020

The territory of Eastern Siberia (Siberian Federal District) is characterized by non-homogeneous location of production and information facilities. The climate in most of the territory is sharply continental. There is widespread permafrost, mountain terrain and low population density in some places. Thus, these factors indicate that it is impractical to develop some parts of this territory. However, a number of industrial cities are located in the northern territories, thus supporting the development of ICT to link with regional centers. The article analyzes the current situation in the development of information and telecommunication networks within the territory of the regions of Eastern Siberia based on aggregated groups of statistical indicators in the period from 2005 to 2018. Drawing on the correlation analysis, a linear relationship was revealed between the selected statistical indicators. A comparative analysis of one of the statistical indicators was carried out according to all ten actors of Eastern Siberia. The diagram shows the ratio of the level of development within the territory of each region, which makes it possible to determine the level of development of information and telecommunication networks in detail.
Search for forms of a single-tube resonator of increased q-factor
Authors: Gadirova T T , Abdulova N A , Shirinova A V , Quliyeva A I , Kravets O Ja
Published: November 2020

The article is devoted to the search for forms of single-tube resonators of high q-factor for vibration density meters of a liquid. In tube resonators, the source of energy loss is the reactive forces that occur during vibrations in the places where the tube is fixed. Therefore, the search for high-q resonator forms is reduced to finding ways to reduce the loss of mechanical vibration energy in the supports. The existing methods of synthesizing resonator forms – heuristic and electromechanical analogies - are analyzed. The advantage is given to the method of electromechanical analogies, as scientifically justified. An algorithm for synthesizing the shape of a high-q resonator is formed. Using the proposed algorithm, a generalized form of a high-q resonator is synthesized, which is a rigidly pinched tube at the ends, symmetrical with respect to the vertical axis of symmetry, with three sections – the Central one and two identical peripheral ones, differing in their mechanical parameters from the Central one. In particular, the form of a resonator in the form of a tube with a step-variable cross-section is proposed.
Risks during the operation of technological equipment at a hazardous production facility
Authors: Valeev S I
Published: November 2020

The paper gives an overview of the performance of technological equipment subject to the influence of various kinds of defects. The possibility of reducing the operational risk during the operation of equipment with the considered defects is considered. Particular attention is paid to the influence of a defect in the base metal of the “delamination” type on the further safe operation of technological equipment. The design of equipment with flaking-type defects was performed by the finite element method using the ANSYS software package. The results obtained permit to conclude that delamination does not significantly affect the load-carrying capacity of the equipment as long as it does not propagate locally.
Research of vibroacoustic signals in diagnostics of technical condition of engines of beet harvesters combines
Authors: Rogovskii I L , Zapadlovskij O S , Voinash S A , Maksimovich K Y , Sokolova V A , Alekseeva S V , Taraban M V
Published: November 2020

The authors of the experimental studies have proved from the possibility of vibration signals to detect the faults and changes in the parameters of the technical condition of engines of beet harvesters combines at the primary stages of their occurrence. Ensuring the predicted reliability of the conclusions, regarding the technical condition of the mechanisms and system of the engine, it can be achieved using the statistical evaluation of the correspondence of the temporal frequency fragments of the vibroacoustic signals and their correspondence to the rotational speed of the crankshaft. The authors investigated the difference between physical models and methods of their mathematical description in different parts of the frequency range and proved the feasibility of dividing it into three frequency subbands: low (0–200 Hz), medium (200–1000 Hz) and high (1 to 10–20 kHz). The authors found out that the series of harmonic signals of engines are characterized by the amplitudes, frequencies and initial phases, whose algebraic sum of ordinates at any given time is equal to the ordinate of the non-sinusoidal signal. Therefore, the Fourier series should be written as the sum of an infinite number of harmonic components of different frequencies. To distinguish the spectrum of the vibroacoustic signal in the diagnosis of the technical condition of engines of beet harvesters combines, it is necessary to use a Fast Fourier Transform. The processing of vibroacoustic signals in the diagnosis of the technical condition parameters of engines of beet harvesters combines is carried out using digital filters, which are implemented by the author’s algorithm.
Ultrasonic tool for the realization of combined action during the drilling of extraterrestrial objects
Authors: Khmelev Vladimir N , Barsukov Roman V , Nesterov Viktor A , Genne Dmitry V , Quan Qiquan , Golykh Roman N
Published: November 2020

The article is devoted to the problem of the efficiency increase of ultrasonic drilling of hard materials for the studies of the soils of the planets, asteroids and other space objects. It is proposed the solution of the problem by the help of developed device, which is able to realize simultaneously with ultrasound the action by low-frequency macro-oscillations and rotational motion of the leading edge of the tool. The tests of the practical construction of the developed device showed the possibility of the speed increase of the ultrasonic drilling due to the additional low-frequency oscillations and pseudo-rotation in up to 1.5 times.
The model of energy distribution during electron beam input in welding process
Authors: Kurashkin S O , Tynchenko V S , Seregin Yu N , Murygin A V , Kukartsev V V , Tynchenko V V
Published: November 2020

Modeling is one of the most important parts of applied research, the processes for which carrying out full-scale experiments is either expensive or highly labor-intensive. The article deals with the problem of modeling the energy distribution at the stage of electron beam input during welding. The solution to this problem will allow not only to reduce the cost of testing the technological parameters of electron beam welding of products with new geometry or from new materials, but also to support the decision-making of the technologist when optimizing the manufacturing process of existing products. Based on the theory of thermal processes, mathematical models have been developed that consider the characteristics of the materials to be welded and the technological parameters of the electron-beam welding process. In the course of experimental studies, the energy distribution was simulated when the electron beam was introduced for structures made of two different materials with different geometries. The obtained models for calculating the temperature at the input section not only supplement the complex of existing mathematical models of the electron beam welding process, but also allow expanding their application for calculating and optimizing the welding process, taking into account the excess temperature at the electron beam input section. In the future, this will allow considering the temperature spread at the input stage and obtaining a more stable quality of the welded seam with fewer root defects.
Reconditioning of continuous casting machine rollers by laser cladding
Authors: Makarov A V , Kudryashov A E , Nevezhin S V , Gerasimov A S , Vladimirov A A
Published: November 2020

The article presents the results of research of structures, compositions and tribological characteristics of coatings for continuous casting machine rollers. The coatings under research were obtained by methods of arc and laser cladding. The experiments were carried out on cylindrical samples of steel 20Cr13. A flux cored wire PP-Np-25Cr5VMoSi was taken as a material for cladding by the arc method. Sparingly alloyed iron-based powder Fe-Co-Cr-Mo was chosen as the material for laser cladding. The estimation of coating properties was carried out by the method of structural and phase analysis. Friction coefficients and wear rates for each cladding material were determined. The article offers an explanation of the differences in the properties of the coatings, which is based on the analysis of their formation conditions, as well as an assessment of the effectiveness of laser cladding in reconditioning of metallurgical equipment parts.
Algorithm for calculating the distribution of temperature fields at the stage of input and output of an electron beam in the welding process
Authors: Kurashkin S O , Tynchenko V S , Seregin Yu N , Petrenko V E , Kukartsev V V , Tynchenko V V , Bukhtoyarov V V
Published: November 2020

The article deals with the problem of modeling the distribution of temperature fields at the stage of input and output of an electron beam during welding. The use of such models will make it possible to simplify the adjustment of the technological parameters of the electron beam welding process, as well as the creation and development of more efficient control algorithms by replacing full-scale experiments with model ones. The mathematical apparatus of the solutions proposed in the article is based on the theory of thermal processes and the theory of welding processes, on the basis of which mathematical models of energy distribution are built. For the practical implementation of computations, the article proposes a block diagram of algorithmic support that allows as to apply mathematical models in modern modeling systems such as MATLAB. Using the proposed solutions, a number of numerical experiments were carried out for a product made of VT-14 titanium alloy and two products of different thickness made of AMg6 aluminum alloy. The obtained distribution of temperature fields, as well as the effective values of technological parameters, practically coincides with the results of earlier full-scale studies.
Experimental study on parameters of Fabbster and Picaso 3D personal printers with XZ-Head Y-Bed and XY-Head Z-Bed kinematics
Authors: Brovkina Yu I , Strizheus V A , Shipilov P A
Published: November 2020

The use of additive technologies greatly simplifies the production of parts of complex shapes. Improving the quality and increasing the speed of printing are urgent tasks for studying the possibilities of applying 3D printing technologies. The experimental study of the kinematic characteristics of 3D printers, considered in the current article, enables to identify problem areas in the designs of existing models of devices for innovative production of non-standard configuration parts, which must be taken into account when designing new.
The assessment of stressed-deformed state of tube bundle of the heat-exchange apparatus with the fixed pipe grids
Authors: Zakirnichnaya M M , Rubtsov A V , Kulakov P A , Galiullina N J
Published: November 2020

Ensuring reliable operation of heat exchange equipment is the key to continuous and efficient operation of the entire technological unit or assembly as a whole. During installation, repair or operation, various deviations of the construction elements of the heat exchangers from the values specified by the project are possible. One of the possible scenarios of such deviations is the deviation of the transverse baffles of the tube bundle from the vertical design position during installation. Since the transverse baffles in the tube bundle play the role of supporting constructions, when they deviate from the vertical design position and at the same time are exposed to operational loads, it is possible to form zones of concentration of increased stresses in the heat transfer pipes, and then the occurrence of defects in these zones. Currently, the work on modeling heat-exchange equipment using specialized software systems for assessing the stress-deformed state taking into account the influencing factors and identifying the most unfavorable zones with maximum effective stresses is relevant. This paper investigates the interconnection between the magnitude and direction of deviation of the transverse baffles from the vertical design position on the stress-deformed state of the tube bundle of the heat exchanger with fixed tube grids along the rows of heat transfer tubes.
Diagnostics of damages in the pre-destruction zone during low-cycle loading in pipeline systems
Authors: Kulakov P A , Rubtsov A V , Afanasenko V G , Galyautdinov D D
Published: November 2020

The paper considers the methodology for determining the location of fatigue destruction using non-destructive testing methods, as well as the assessment of the residual resource. The metal of the main pipeline was tested to test the determination of the stress-deformed state. The main causes of the destruction of pipeline systems were investigated and the choice of non-destructive testing methods that were adequate in terms of the diagnostics of main pipelines was justified. The developed methodology for testing low-cycle fatigue of samples of main pipelines that were in operation allows us to establish regularities of change in the stress-deformed state and magnetic characteristics of the material of main pipelines at various stages of its life cycle. The iterative cyclic experimental studies carried out make it possible to determine the potential destruction zone and evaluate the effect of the number of cycles on the residual resource of the pipeline. Experimental data correlate with data obtained using a digital network-centric system.
Reliability-based topology optimization as effective strategy for additive manufacturing: Influence study of geometry uncertainty on resulting layouts
Authors: Kharmanda G , Antypas I R
Published: November 2020

The effectiveness of Additive Manufacturing (AM) is to fabricate very complex configurations that can be resulting layouts from topology optimization. The topology optimization can be classified into two models: Deterministic Topology Optimization (DTO) and Reliability-Based Topology Optimization (RBTO). The DTO may lead to unrealistic designs since it provides a single solution for a given design space. However, the RBTO is considered as a topology generator which provides several layouts. This way the designer can overcome the manufacturing constraint problems such as overhang, minimum feature size, anisotropy …, that may lead to a failure during the production process. Two RBTO strategies based on the Inverse Optimum Safety Factor (IOSF) are presented in this work: Objective-Based IOSF Approach and Performance-Based IOSF Approach. These approaches can be efficiently used as a topology regularization procedure. In addition, to consider the geometry uncertainty, different layouts can be obtained when increasing the reliability index values in order to provide more choices for designers. The geometry uncertainty is applied here in a manner to not affect the boundary conditions which can lead to change the structure’s functioning. The resulting RBTO layouts in this work, are too organic which leads to manufacturability problems. To use the conventional manufacturing procedures, classic CAD primitives must be used to simplify the geometry, that may lead to lose the optimality. Because of this manufacturability difficulty, AM is then obligatory. The RBTO being a good design tool for AM, paves the way to the next developments to overcome other fabrication constraints considering the reliability index values as a topology regulator.
Improving the selection methodology rational ways to restore parts when repairing machines
Authors: Leonov O A , Shkaruba N Zh , Vergazova Yu G , Golinitskiy P V
Published: November 2020

Features of quality assurance of production at machine-building enterprises of repair profile are considered. It is revealed that a large number of methods and means of restoring worn parts are used in the repair of machines − mechanical processing, surfacing and welding, metallization and spraying, electrolytic build-up, plastic deformation, and many others. A critical description of the existing theoretical positions on the choice of the most appropriate ways to restore details is presented. It is revealed that the existing methods are based on the criteria of manufacturability, durability and economy and consider the problem of whether it is appropriate to choose a particular method of restoration for only one part forming a joint. A model has been developed to optimize the cost of repairing parts that form a joint, taking into account both the cost of restoring each part and the cost of processing them. Calculations are made for a certain probability of failure and a given resource according to the criterion of the lowest total costs.
Quality assessment of spare parts for the final drive reduction gear used in the MTZ-82.1 tractors
Authors: Lazar V V , Skorokhodov D M , Kazantsev S P , Kataev Yu V , Sergeeva N A
Published: November 2020

The main machine repair problem and the main hidden defects are determined. The analysis of the protocols of the machine test stations showed that the greatest number of tractor failures occurs in the final drive gearboxes. To study their quality, such spare parts as the shaft, front axle half-shaft and the gear were selected. The main physical, mechanical and geometric parameters of the investigated spare parts, necessity and reasons for high quality control for qualitative production of spare parts are considered. Controlled geometric defects, methods and means of control of transmission spare parts are determined. Means of measurement for comparison of indicators and control accuracy are proposed.
Analysis of the wave phenomenon stability in network-like industrial constructions
Authors: Provotorov V V , Tkachova S A , Part A A , Volkova A S
Published: November 2020

Weak solutions of the initial boundary value problem for the second order hyperbolic equation with distributed parameters on an arbitrary oriented graph are considered. Weak solutions are determined by an integral identity, replacing the equation, the initial and boundary conditions. This indicates the spaces in which the search a weak solution is proposed, the conditions of weak solvability of such a problem and the consequent analysis of the stability of the solution are given. The central idea that defined all the content of the work is to apply the Fourier method to analysis evolutionary initial boundary value problems. Namely, the presentation of the solution in the form of a generalized series of Fourier, followed by an analysis of the convergence of this series and series, obtained by his one-time member differentiation. A essential role will play the system of generalized eigenfunctions and spectral characteristics of the elliptical operator of the hyperbolic equation. This considers homogeneous boundary conditions of the first genus (Dirichle conditions), the analysis of stability for the boundary conditions of the second and third genus is similar. The results are fundamental in the study of the control problems of oscillation of network-like industrial constructions, first of oll under studying the question of damping antenna constructions of different types.
Multichannel measuring device with two switches
Authors: Shaydurov V V , Korneeva A A , Chzhan E A
Published: November 2020

The paper presents a scheme of a multichannel measuring device with two switches for temperature control on board of the spacecraft. This scheme is based on the multiplicative use of switches, which provides a much more measurements compared to analogues with two separate switches.
Modeling the distribution of internal stresses in surface strengthened layer of steel parts after cementation and hardening
Authors: Rogovskii I L , Titova L L , Voinash S A , Sokolova V A , Pushkov Yu L , Krivonogova A S , Kokieva G E
Published: November 2020

Based on the analysis of existing trends in mechanical engineering, it is established that the complexity of modern gear parts imposes on the material increasing technological requirements for stamping, machinability, welding, hardenability, cementing and gouging in the hardening process, which explains the need for alloying, chemical elements. The influence of different compositions of steels for gears on the level of internal stresses that occur in the parts during heat treatment has been studied. The optimal composition of complex-alloyed cementing steel is established. Analysis of the results of modern research allows us to state that the residual stresses in the surface layers of steel parts after cementation and hardening may be appropriate. These are the cases when their direction of residual stresses is opposite to the direction of stresses that arise during the operation of steel parts. Complex alloying with titanium and niobium allows to increase manufacturability of steel and, as a result, to increase operational indicators of products of mechanical engineering of details. In the course of research, it was found that the level of grooving of parts in the process of chemical-thermal treatment will provide tolerances of 0.029 mm, steel 12Cr3Ni (minimum P and S) – 0.055 mm and is directly dependent on the level of internal stresses.
Influence of a 3D printer dynamic characteristics on building products printing accuracy
Authors: Emelyanov R T , Prokopev A P , Turysheva E S , Terehova I I , Pindur S V
Published: November 2020

The results of studying the dynamics of a construction 3D printer of manipulator type are considered. The analysis of the relevance of the 3D printing in road construction use, comparison of the technology with traditional methods of concrete structures construction is carried out. The choice of the investigated device type has been substantiated. A brief description of the construction 3D printer device, its element base and operating principle, illustrations of the research object and graphic materials are given. Forming without formwork using sliding formwork is considered, the mixture is compacted by the vibrator of the installation. A model of a construction 3D printer has been developed, which makes it possible to study the dynamic processes of interaction of the sliding formwork of the installation with a concrete mixture during construction products 3D printing. The temporal values of vibrations of the construction 3D printer trolley have been determined. The graphs of the oscillatory process of 3D printing and the time dependences of the electric current in the starting and operating modes were obtained.
Production chains configuration based on a systematic approach
Authors: Melamed N V , Sokolova V A , Iljushenko D A , Voinash S A , Alekseeva S V , Gogolevskii A S , Trepkova S A
Published: November 2020

The formalization of production tasks has been carried out, including the tasks of selecting individual links in the production chain (suppliers, carriers, warehouses) and choosing production chains based on the principles of a systematic approach. Hierarchical structures are constructed (basic criteria and alternatives are defined) for two classes of production problems of choice - the choice of a link in a production system and the choice of a configuration option for a production chain (network).As calculation methods, it is proposed to use methods for processing inaccurate pairwise comparisons to solve multi-criteria decision-making problems. An extension of the DS/AHP method is proposed in the paper. A new method for analyzing hierarchies to solve the problem of multi-criteria decision making using the Dempster-Scheifer theory differs from existing methods in that pairwise comparisons of elements, both at the level of alternatives and at the level of criteria, are replaced by the choice of the most preferred groups of elements. It takes into account the fact that the multi-criteria decision problem might have several levels of criteria. Moreover, it is assumed that expert judgments concerning the criteria are imprecise and incomplete. A numerical example explains in detail and illustrates the proposed approach.
Investigation of the linear shrinkage of photopolymer material during the technological preparation of the production of engine parts
Authors: Vdovin R A
Published: November 2020

The paper presents the results of the study of the effect of linear shrinkage on the geometric dimensions of products (samples) made by layer-by-layer application of a photopolymer material and subsequent curing with an ultraviolet source. This technology is becoming especially relevant in modern engine building, with the diversified nature of production. Also, the technology of layer-by-layer synthesis of a photopolymer material has found wide application in the manufacture of master models of gas turbine engine blades, since the blades have a developed spatial shape and increased requirements for geometric dimensions. The results presented in the work make it possible to estimate the value of linear shrinkage numerically for its further compensation during the technological preparation of production.
Air traffic control with prognosticated flight trajectory
Authors: Markelov V V , Shukalov A V , Zharinov I O , Zharinov O O , Kostishin M O
Published: November 2020

The satellite navigation and precision inertial system development quality leap provided a significant increase of the object position definition accuracy characteristics. This technology implementation in aviation led to possibility of flights in the given trajectory coordinates through a geodesy system without application of ground radio beacons to navigate. Of course, there is also a possibility to make a flight with a random route connecting airports of taking off and one of landing with optimal trajectory keeping in mind the limitations of air space restricted areas including sometimes the zone landscape. Logically to continue the transformation from the flights with radio beacons to navigate to the flights of so called zone navigation they need to form a given route and its sections connected to the way points with clearly defined geodesy system coordinates. So there is a possibility of accurate aircraft movement trajectory prognostication in a route and the prognostication of its navigation characteristics. There are some principles proposed of a control algorithm being applied during the aircraft movement in prognosticated navigation trajectories.
Determination of microrelief parameters of spherical parts processed by centerless grinding
Authors: Reshetnikova O P , Iznairov B M , Vasin A N , Davidenko O Y , Belousova N V , Semochkin G A
Published: November 2020

In the processing treatment of cleanoff and finishing operations of the parts with abrasive tools, very important tasks are both predicting their results depending on the assigned modes, and the appointment of modes depending on the required quality of the processed surfaces. In the article, the parameters of the microrelief formed as a result of centerless grinding of a complete sphere are determined analytically. The influence of the aging process on the formation of spherical surface roughness is determined. Calculations of the arithmetic mean deviation of the micro-profile of a spherical surface are given, depending on the number of working strokes of the grinding wheel.
The use of a heating element to combat soil freezing to the working bodies of machines
Authors: Zenkov S A , Dryupin P Yu
Published: November 2020

The development of wet cohesive soils at negative temperatures leads to soil freezing to the working bodies of earth-moving machines, which leads to a decrease in the useful volume of buckets and, consequently, to a decrease in the productivity of the machine. This article discusses the thermal effect on the simulator of the working body of an earth-moving machine. As a heat source, a tape heating element was used, namely, a carbon heating flexible tape. The technical characteristics of this heating tape and its technical device are presented. The results of experimental studies of the heating of the ladle simulator are presented and the temperature-time characteristics of the heating tape are constructed. The one-factor regression equations for the heating temperature of the bucket simulator at different ambient temperatures are presented. Research has been carried out on the effect of heating the bucket simulator by the heating tape belt on the soil shear force.
Mathematical model of the operating process of a mower for mowing vegetation in the near-trunk strip
Authors: Apazhev A K , Polishchuk E A
Published: November 2020

Due to the limited areas suitable for use for the agricultural production needs in the North Caucasus region, a promising direction is the development, for the cultivation of fruit crops, slope lands characterized by favourable soil and climatic conditions. At the same time, the most effective method of developing slope lands is terracing. Among the variety of different ways of maintaining soil in gardens, in terraced gardening, in order to minimize soil erosion processes, as well as provide plants with moisture and the required nutrients, a sod-humus system is used, which provides for mowing vegetation growing in the aisle and near-trunk strip for mulch. The design features of the terraces impose restrictions on the agricultural units working conditions, among the many of which it is necessary to highlight the possibility of approaching the row line for processing plants from only one side. The designs of mowers currently used in industrial horticulture, for the complete removal of vegetation from the near-trunk strip, require the passage of the unit along each side of the row line, which cannot be provided in terraced gardening conditions. Based on the foregoing, the development of a new design of a mower for mowing vegetation in the near-trunk strip, as well as in the zone of the near-trunk circle, which allows maintaining and increasing soil fertility on slope lands, is relevant in the conditions of mountain and foothill gardening in the Central part of the North Caucasus.