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MICROANALYSIS OF THE FRICTION SURFACES OF SOLID LUBRICATING COATINGS OF VARIOUS TYPES OF APPLICATION
Authors: P.N. KHOPIN, Dr. Sc., V.V. GRIB, Dr. Sc.
Abstract: As a result of the studies, it was found that the optimal thickness of the solid lubricant coating for suspension application is from 20 ± 5 microns (according to domestic literature data) to 7,62...12,7 microns (according to the US instructions), for magnetron deposition – 1 micron. During friction, the initial thickness of the suspension coating (~20 µm) decreases so much (2...3 µm) that contact of the highest microroughnesses occurs through the MoS2 lubricating film, which is also observed for magnetron applied solid lubricant coatings. Optimal roughness of base processing before suspension deposition is Ra = 0,3...0,6 µm, for magnetron deposition ‒ 0.2 µm. With a decrease in the roughness of the base processing before magnetron deposition with Ra = 0,05...0,4, the friction coefficient of the interface decreases from ff = 0,05 to 0,02.
Keywords: solid lubricating coatings, suspension and magnetron deposition, coating thickness, base roughness.
TRIBOTECHNICAL PROPERTIES OF COMPOSITE COATINGS
FOR END MILLING CUTS
Authors: M.Sh. MIGRANOV, Dr. Sc., A.M. MIGRANOV, Postgraduate
S.R. SHEKHTMAN, Dr. Sc.
Abstract: The results of theoretical and experimental studies of the tribotechnical characteristics of composite multilayer coatings for cutting tools during milling are presented. A decrease in the friction coefficient, an increase in the service life of the cutting tool and a decrease in the thermal loading of the cutting zone during milling operations with the use of wear-resistant coatings are established.
Keywords: composite multilayer coatings, milling, secondary structures, entropy, tribosystem.
WEAR-RESISTANT COATINGS FOR CUTTING TOOLS
AFTER IONIC MIXING
Authors: .Sh. MIGRANOV, Dr. Sc., A.M. MIGRANOV, Postgraduate
Abstract: The paper presents the results of a study of the proposed way to increase the wear resistance of “duplex” coatings applied to cutting tools, which are due to preliminary diffusion saturation of the tool surface with nitrogen (known as ion nitriding) followed by physical deposition of a hard coating (Ti, Cr) N. The proposed coating was applied to a high-speed steel tool, but before that a layer with an impurity of ions was implanted on the nitrided surface, and then a hard coating was deposited. As an additional, transition layer, a metal was used: Ti, Zr, W and Al in combination with three non-metals N, C, and O.
At the stage of the triplex-processing process, these ions were implanted into the surface of the substrate, creating a modified layer. To assess the effect of these modified layers
on the tool life, a series of field experiments were carried out under the conditions of blade cutting. The best results were achieved with "triplex" treatment with titanium ion implantation.
Keywords: wear resistance, duplex coatings, hard coating, tribotechnical characteristics, modified layer, "triplex" treatment.
CORRELATION FUNCTION AND SPECTRAL DENSITY OF RANDOM FLUCTUATIONS IN THE AMOUNT OF CARGO ON THE CONVEYOR
Authors: V.P. DYACHENKO, Cand. Sc.
Abstract: The article presents analytical dependences of the correlation function and the spectral density оf the integral load on the conveyor belt in the conditions of random cargo flow, which is specific to mining enterprises. Mathematically, the process of cargo entering the conveyor is considered to be a Markov exponentially correlated random process. The probabilistic parameters of the desired load on the conveyor are determined for two models of random cargo flow: the classical model and the one proposed in earlier works of the author of this article. The analytical dependences obtained in this work can be applied to model the speed control system of a belt conveyor depending on random fluctuations in the input cargo flow, as well as to determine the probabilistic characteristics of random fluctuations in the load on the drive and the maximum tension
of the conveyor belt, the amount of methane released by transported coal in mine workings.
Keywords: belt conveyor, calculation of the tension of the belt, the traffic, the load on the actuator, Markov random process probabilistic characteristics.
PROBABLE DISTRIBUTION OF LOAD AND STRENGTH OF PARTS
FOR DISC SAWING MACHINE
Authors: A.A. PETSYK, Postgraduate, M.V. SECRETOV, Cand. Sc.
Abstract: The paper considers the issues of reliability of stone sawing machines using the example of a diamond disk machine. With the help of the probabilistic strength calculations carried out in the work, the main optimal geometric parameters of the gear-rack drive of the disk machine were found: modulus, diameter, width - and it was determined that the resulting operating stresses are very sensitive to changes in the listed geometric parameters. On the basis of the calculated data, graphs of dependencies were built, showing the significance and necessity of using probabilistic calculations, in order to determine the degree of influence of the parameters of the rack and pinion transmission of the disk machine on bending fatigue.
Keywords: stone sawing machine, probability distribution, random variables, rack and pinion transmission.
OPTIMIZING A HYDRAULIC EXCAVATOR
Authors: N.D. KHARITONOV, Postgraduate, S.G. GUBANOV, Cand. Sc.
Abstract: The paper considers the issue of finding the optimal angle of penetration of
the bucket into the rock in a hydraulic excavator. The study was carried out using
3D modeling and simulation technology using Autodesk Inventor software. For this, a model of the working body of the excavator was created, on which the calculations
were made. The final result of the study was graphical dependencies, which show
the change in the angle of penetration of the bucket from the angles of deflection of
the working boom, which allows us to conclude about a rational angle of deflection at which it is possible to reduce the working cycle of the excavator. Given the human factor and the incomplete autonomy of the excavator's working cycle, this study is more applicable to automated excavation, which the modern engineering community is striving for.
Keywords: hydraulic excavator, modeling, calculation and simulation.
ALGORITHM FOR OPTIMIZING THE HYPERPARAMETERS
OF A MULTILAYER PERSEPTRON FOR SOLVING THE PROBLEM
OF PREDICTING THE TECHNICAL STATE OF A SPACE VEHICLE
Authors: G.A. ZUBKOV, Researcher
Abstract: The article is devoted to the development of an algorithm for optimizing the hyperparameters of a multilayer perceptron for training the feedforward algorithm, which solves the problem of predicting the technical state of a spacecraft. The relevance of predicting the state of spacecraft is due to the increasing level of complexity of the tasks performed by the analysis sector of the mission control center. The proposed algorithm includes the determination of the empirical distribution of hyperparameter values with a random search for values from this distribution, as well as further search for the values of the model hyperparameters on the grid. The use of this algorithm made it possible to significantly reduce the time for finding the optimal hyperparameters in comparison with other methods of searching for hyperparameters. A qualitative assessment was made by comparing the total time of finding the hyperparameters using the algorithm and using other methods.
Keywords: neural network, multilayer perceptron, hyperparameters, optimization, spacecraft, machine learning, grid search.
FEATURES OF 3D MODELING OF PEAT IN THE GEOINFORMATION ENVIRONMENT MICROMINE
Authors: T.B. YAKONOVSKAYA, Cand. Sc., A.I. ZHIGULSKAYA, Cand. Sc.
Abstract: One of the most important tasks of paramount importance for the design of a peat mining enterprise is the construction of an information model of a peat massif. In the article, the authors show the result of modeling a peat deposit in the Micromine mountain geographic information environment (GIS) using system approaches to processing geological information from various peat schools. As a result of modeling on the informational data of detailed exploration, three versions of the geological model of the «Olchevskoe» peat deposit were obtained. In conclusion, the authors cite the following conclusions: first, a wide range of software packages has been developed on the software market for mining enterprises; secondly, the system principles embedded in the software are the same, but for the purposes of a particular mining enterprise, mining and geological conditions and the type of deposit, it takes a lot of time to adapt mining geographic information systems; thirdly, depending on the underlying theoretical and systemic principles in the informational description of a peat deposit, the created 3d models will differ significantly.
Keywords: geographic information systems (GIS), modeling of deposits, 3d model, scientific peat schools, Micromine.
SYNTHESIS OF REGULATING DEVICES
IN AUTOMATIC CONTROL SYSTEMS
BY THE EQUAL SPEED OPERATION LINE METHOD
Authors: B.I. MARGOLIS, Dr. Sc., K.I. MAKAROV, Undergraduate
Abstract: The article describes a method for calculating the settings of regulators in automatic control systems using lines of equal speed operation. The development of the extended frequency response method for solving the problem of synthesizing systems with a given speed is proposed. The examples of calculating the settings of regulators in the MatLab environment are considered. The graphs of the transient process and quality characteristics of control systems were obtained.
Keywords: automatic control system, regulator, transient process, extended frequency characteristics, speed operation, quality indicators.
DATA PROCESSING IN A MOBILE SYSTEM OF IMITATION
OF ISOLATING RESPIRATORY EQUIPMENT
BASED ON NEURAL NETWORK TECHNOLOGIES
Authors: A.D. OBUKHOV, Cand. Sc., D.L. DEDOV, Cand. Sc., M.V. ZVEREV, undergraduate
Abstract: The paper considers the problem of information processing in the subsystem of the training complex ‒ a mobile system for imitation of self-contained breathing apparatus. Two problems have been identified: the need of determine new calculation formulas after replacing the system components with analogs and predicting values in case of loss of data packets during their wireless transmission. To solve them, data processing algorithms have been developed based on neural network technologies, which make it possible to automate search for calculation formulas during the transition from system components to analogs and reduce the number of data packet losses by predicting missing values. Experimental studies have confirmed the adequacy and effectiveness of the proposed algorithms. The use of neural networks in solving information processing problems has improved the accuracy of this process.
Keywords: neural networks, data processing, missing values restoration, forecasting, training complexes, simulation systems, mobile development.
MORPHOLOGICAL METHOD OF SYSTEM ANALYSIS
IN SOLVING APPLIED PROBLEMS OF INDUSTRIAL SAFETY
Authors: N.M. PUZYREV, Cand. Sc., D.V. MARTYNOV, Cand. Sc.,
N.B. BARBASHINOVA, Lecturer
Abstract: When solving problems aimed at improving the level of industrial safety in ergatic systems, it is necessary to take into account a fairly large number of factors that form a complex interconnected structure. To solve this type of problem, the possibility of using various methods of system analysis is proposed and justified. The morphological method of analysis of complex systems can be considered the most effective way in which a large number of initial parameters can be taken into account. As an example, the solution of the problem of reducing the sound pressure level to the standard level in the production room is considered. An example of calculating the criterion of compliance with the standard level of safety in solving the problem of reducing the level of sound impact on personnel is proposed.
Keywords: industrial safety, system analysis, morphological method.