Collection of Research Papers of the National Mining University最新文献

{"title":"Drilling mechanical hydrogen extraction at mining enterprises of Ukraine","authors":"O. Davydenko, R. Ahaiev, S. Shypunov, V. Yavorska, M. Kononov","doi":"10.33271/crpnmu/72.249","DOIUrl":"https://doi.org/10.33271/crpnmu/72.249","url":null,"abstract":"Purpose. Increasing the technical and economic indicators of well mechanohydraulic production due to the selection of the type and optimal formulation of drilling flushing fluids. In today's conditions, the lack of energy carriers requires involving a wider range of natural phenomena in energy production, looking for reliable ways and methods of increasing the efficiency of production. The use of energy also forces the introduction of resource-saving, environmentally safe geotechnologies in the energy-intensive technological processes of mining, transportation, crushing and beneficiation of minerals in the conditions of powerful mining enterprises of Ukraine. The methods. The study of the features of the creation and implementation of a progressive complex hydraulic program for the construction of wells was carried out using modern methods of analytical analysis and experimental research, in particular by using general principles of mathematical and physical modeling, methods of processing research results in the environment of МАТHCAD, control and measuring devices and materials. Findings. Development and operational implementation of justified resource-saving ecologically safe geotechnologies and environmental protection strategies. Flushing fluid treated with direct current can be used to increase the technical and economic indicators of the well drilling process. The originality. Dependencies have been established that describe the process of formation under the influence of a rock-destructive tool of individual rock particles that are exposed to the action of the boundary layer, and others that fall into the zone of action of the laminar sublayer. A dependency has been established that describes the process of leaving parts of the sludge that are not carried away by the flow of washing liquid, which, in turn, leads to its further grinding and increased wear of the rock-crushing tool. Practical implementation. Data were obtained on the adsorption reduction of hardness, which is a consequence of the increase in the affinity of the collapsing rock to the washing liquid. This is reflected in the intensive binding of water (hydrate) shells on the inner surface of microcracks or in their mouths. The parameters for improving the efficiency of iron ore extraction in the conditions of deposits of Ukraine are given and substantiated, in particular, a careful approach to the process of regulating the pH level of cleaning agents, taking into account the geological and technical conditions of drilling operations and the intended purpose of wells","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76959992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of the effect of topological optimization of metal parts","authors":"I. Matsiuk, O. Koptovets, E. Shliakhov, P. Diachkov","doi":"10.33271/crpnmu/72.144","DOIUrl":"https://doi.org/10.33271/crpnmu/72.144","url":null,"abstract":"Purpose. The purpose of this article is to evaluate the efficiency of using the “Shape optimization” option in the Fusion 360 software product of the American company Autodesk for the details of the braking system of a mining electric locomotive. Methodology. With the advent of modern computer programs, the content of the design engineer’s work has changed, the design process has been reduced to the development of a 3D model of a metal product, which can then be subject to stress-strain analysis and, based on the results of this analysis, low-stress areas of the product which can be removed are be determined, that is, the weight of the metal used is reduced. Of particular importance is generative design, which is a new design technology. It is based on the use of software that can independently generate three-dimensional models that meet specified conditions without the involvement of a designer. Essentially, in the “human-machine” system, creative functions are passed to the computer, which deals well with them. The second most important technology is topological optimization (Shape optimization), which is applied to a model already developed by the designer in order to improve it. Findings. The paper presents the results of the research on reducing the weight of the parts of the braking system of the mine electric locomotive due to the topological optimization of their structures in the Fusion 360 software product. The removal of unloaded areas of the product was performed using the special option “Shape optimization” of this program.The effect of weight reduction in products after topological optimization is estimated to be approximately 35-45%. Originality. The use of topological optimization in the details of the braking system of the mining electric locomotive is a new approach to optimizing the structure and obtaining parts of reduced mass. Practicalvalue. The application of topological optimization at the design stage helps to find a construction design option with the most rational distribution of material and voids in a given area taking into account strength and stiffness, and, thus, significantly reduce its weight.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79049598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The justification for using mobile crushing and screening plants in quarrying industrial minerals","authors":"B. Sobko, L. Hrytsenko, V. Kriachek","doi":"10.33271/crpnmu/72.007","DOIUrl":"https://doi.org/10.33271/crpnmu/72.007","url":null,"abstract":"Purpose. Industrial minerals mining technology justification using mobile crushing and screening plants. Methodology. Analytical, statistical, graph analytical methods and experimental research were used on working quarries. Findings. The research made it possible to establish the influence of the migmatites mining technology by mobile equipment on the capacity of the extraction-loading and transport equipment. The following conclusions can be made based on the studies of the complex influence of the factors of the industrial minerals mining technology by mobile equipment on the example of the Odarivsky deposit of migmatites. Using mobile crushing and screening equipment located in the quarry allows for increasing Excavator Productivity for loading crushers' hopper at 16.7% compared to the loading in haulers and increases the productivity of haulers at an average of 25% compared to the cyclic technology in which the crushing and screening equipment is located on the surface, and haulers carry out the transportation of raw material from the quarry. The increase in the productivity of mining transport equipment is achieved due to the absence of downtime of the excavator while waiting for haulers and the maximum use of the vehicle's load when transporting finished crushed stone products with a high bulk density. Originality consists in establishing the peculiarities of industrial minerals mining and establishing the dependences of changes in the productivity of mining transport equipment when using mobile crushing and screening equipment directly on the working sites of the quarry. Practical value. The results of the research made it possible to justify the complex mechanization of the cyclic technology of raw material extraction with the use of mobile crushing and screening equipment for the application in Odarivsk migmatite deposit, which increases the efficiency of the use of extraction and loading equipment and haulers, which ultimately reduces the need for transport equipment and improves the efficiency of the mining as a whole during the industrial minerals mining for the production of aggregates.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84544627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mathematical simulation of rock mass destruction zones by explosion","authors":"M. Kononenko, O. Khomenko, I. Sadovenko, V. Sobolev","doi":"10.33271/crpnmu/72.040","DOIUrl":"https://doi.org/10.33271/crpnmu/72.040","url":null,"abstract":"Purpose. Improving the parameters of the rock mass destruction zones by a blasting, depending on the pressure of the explosion products in the charging cavity and the physical and mechanical properties of rocks by combining analytical and numerical mathematical simulation. The methodology of research. Using the theory of elasticity and the main provisions of the quasi-static wave hypothesis of the mechanism of destruction of a solid medium under the action of an explosion, an analytical simulation of the parameters of the formation of crush zones and grinding of a rock mass around the charging cavity under its explosive load was carried out. After the change in the stress-strain state of the massif under the action of the explosion, numerical simulation of the crushing zones, intensive grinding and cracking by the finite element method was carried out. To establish the suitability of the obtained analytical models for calculating the radii of the indicated zones, the results of analytical and numerical simulation were compared. Findings. Analytical models have been developed for the radii of the zones of crushing, intense grinding and cracking, which are formed around the charging cavity in the rock mass under its explosive load, taking into account the pressure of the explosion products, the tensile-compressive strength of the rocks, their structural structure, and fracturing. Numerical simulation of the destruction of rocks around the charging cavity established the power-law dependences of the change in the radii of the crushing zones and the grinding of the massif depending on the diameter of the charging cavity, the pressure of the explosion products, and the compressive strength of the rocks. By comparing the results of analytical and numerical simulation for rigid boundary conditions of a homogeneous non-fractured massif, the discrepancy between the radii of the indicated zones is found to be 4, 8 and 6%, respectively. The originality. The radii of the zones of crushing, intense grinding and cracking, established by mathematicalsimulation, formed during the explosive destruction of the rock mass, change according to a power law dependence on the diameter of the explosive charge, the pressure of the explosion products in the charging cavity, the strength of the rocks in tension-compression, the coefficients of the rock structure, structural weakening and compaction, determine the increase in the accuracy of estimating the parameters of the destruction of the rock mass up to 50%. Practical implications. Based on mathematical models of the radii of the zones of crushing, intense grinding and cracking, which are formed in the rock mass around the charging cavity under the action of an explosion, improved parameters of drilling and blasting operations are determined for mine workings, special-purpose cavities and breaking of the massif.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85793228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of ideas about the mechanism of coal-overlaying formation displacement in terms of its influence on local gas-drainage parameters in the Western Donbas conditions","authors":"V. Bondarenko, I. Salieiev, I. Kovalevska, H. Symanovych, M. Shyshov, O. Malova","doi":"10.33271/crpnmu/72.027","DOIUrl":"https://doi.org/10.33271/crpnmu/72.027","url":null,"abstract":"Purpose. The research purpose is to study the mechanism of the influence of geomechanical-technological factors on the location parameters of the gas-drainage wells behind the longwall face in the area of stope operations under the conditions of weakly metamorphosed rocks. Research methodology. An integrated approach is used, including an analysis of existing research on the gas release patterns in the mine workings of extraction sites and local gas-drainage parameters, analysis of geomechanical processes, development of schemes for modeling by the finite element method, substantiation of methodological approaches for conducting experimental research into the rock pressure manifestations in extraction working, taking into account existing tendencies of the influence of stoping face advance velocity. Research results. The views on the mechanism of the stratified mass texture transformations of weak rocks have been developed during the study of the optimal extraction site gas-drainage parameters. The deformation development schemes have been constructed for any layer of the main roof behind the area of longwall face conjugation with the extraction working, displacement of coal-overlaying formation rocks along and across the extraction site with the location of gas-drainage wells. Based on the conducted research, recommendations on the rational location of gas-drainage wells have been obtained. Scientific novelty. The main characteristics of the weakly metamorphosed rock displacement process in the area of stope operations are studied in a spatial formulation, and the mechanism of the influence of geomechanical-technological factors on the expedient location parameters of gas-drainage wells behind the longwall face is represented on the relevant schemes. Practical value. The reliability of the proposed location parameters for gas-drainage wells behind the longwall face in the conditions of weakly metamorphosed rocks of the Western Donbas has been analyzed, taking into account the stoping face advance increased velocities.The conclusions drawn on the basis of rock displacement tendencies in the coal-overlaying formation are summarized in the schemes for identifying the mechanism of rock mass deformation near the area of stope operations.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":"190 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79504013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acid systems usage for inflow intensification technologies experimental justification","authors":"O. Aheicheva","doi":"10.33271/crpnmu/72.239","DOIUrl":"https://doi.org/10.33271/crpnmu/72.239","url":null,"abstract":"Purpose. Research and experimentally substantiate the use of acid systems for inflow intensification technologies. To study the peculiarities of the mechanisms and methods of restoration of the near-outbreak zone of the reservoir. The methods. 1. Diagnosis of the causes of deterioration. 2. Selection of appropriate reagents for processing. 3. Selection of the method of delivery of the agent into the reservoir (design). 4. Modeling (calculation). 5. Prediction of the final productivity of the well. Findings. There are some physical means of diverting the injected acid composition for selective treatment, which include: the use of rubber-coated balls added to the injected fluid composition to plug the receiving holes, and the use of packers that isolate the zone necessary for cleaning during operation from the rest of the wellbore. Mechanical methods of selective cleaning differ from others in that they completely cover non-target intervals, directing the entire flow of the reagent to the open area. The originality. Increasing the effectiveness of the influence of hydrochloric acid solutions on the near-cut zone of wells is one of the factors in the effective development of oil deposits in carbonate reservoirs. To solve this problem, geological and technological justification of the choice of wells and technological parameters of influence in specific geological conditions of the deposits is necessary. Practical implementation. A significant number of technologies proposed today for the intensification of the subsurface zone with hydrochloric acid indicate a great variety of productive layers in terms of their occurrence, geological-physical and physico-chemical properties of reservoir rocks and fluids that saturate them, differences in development technology that must be taken into account when influencing increasing its efficiency. Acid treatment is one of the traditional and generally accepted methods of restoring by dissolving the rock and the subsequent formation of highly permeable channels. In order to maximize the effect of the treatment, the active part of the composition (acid) should be redistributed to evenly treat all clogged areas, and the entire composition after working out should be easily removed at the stage of washing and development after the operation.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87351127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of the use of composite materials for further application in the support of mine workings","authors":"I. Sheka, I. Salieiev, M. Shyshov, O. Malova, V. Pochepov, O. Mamaikin","doi":"10.33271/crpnmu/72.062","DOIUrl":"https://doi.org/10.33271/crpnmu/72.062","url":null,"abstract":"Purpose. To analyze composite materials and prospects of their use for roof support in coal mines. Research methodology. To achieve this purpose, we used analytical data on the market of composite materials, the volume of their production capacity, and cost indicators. Data on the physical and mechanical properties of composite materials and their quantitative indicators were used. Research results. The areas of application of composite materials in industry are analyzed and summarized. The analysis shows that composite materials are used in many areas of industry: medicine, construction, defense, etc. A comparative analysis of the physical and mechanical properties of carbon fiber-reinforced plasticand steel shows that this composite material has identical (and sometimes even better) properties than metal materials. The study concluded that it is better to use carbon fiber as a support material for mine workings in coal mines. The advantages and disadvantages of carbon fiber-reinforced plasticas a roofing material for coal mine workings are evaluated. It is clarified that the current limiting factor is the cost of carbon fiber-reinforced plastic, but over time, their price will decrease and their demand will increase. It is concluded that the use of this composite material in the elements of mine support can increase the pace of their implementation, reduce the labor intensity of the work performed and improve the working conditions of miners while lightening the structure. Scientific novelty. The physical and mechanical properties of composite materials have been analytically determined and it has been substantiated that carbon fiber-reinforced plasticsupports can be used in the support of preparatory workings in coal mines. Practical value. The obtained results prove that the support made of carbon fiber-reinforced plasticwill facilitate the design of the support, which, together with the acceleration of the shift operation, will contribute to the development of underground coal mining.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84751060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research of temperature phenomena during the mechanical processing of steels and iron","authors":"V. Derbaba, O. Bohdanov, V. Ruban","doi":"10.33271/crpnmu/72.202","DOIUrl":"https://doi.org/10.33271/crpnmu/72.202","url":null,"abstract":"Purpose. Research of temperature phenomena in the cutting zone of steel and cast iron blanks in the conditions of industrial production by methods of computer modeling of non-stationary processes of heat exchange during mechanical processing and the search for the optimal material for a cutting tool. The methods. Research methods were based on the basics of the theory of cutting and cutting tools, the theory of heat conduction in relation to the contact surfaces of the cutting tool and the workpiece in the cutting zone. Use of an application program for modeling thermal phenomena during mechanical processing of metals and alloys. Determination of optimal cutting modes taking into account temperature changes. Findings. A computer experiment confirmed that the optimal cutter materials when processing 30X steel is a tool made of P6M5 material, and it is better to use a tool made of VK8 material for processing ChCh20 cast iron. With the same cutting parameters (cutting depth, feed, cutting speed, tool geometry), the contact surfaces heat up less, and therefore the tool will lose its cutting qualities more slowly and will last longer, with the proper quality of the final product. If there is a lack of cutters made of optimal materials in the conditions of limited capabilities of the enterprise, it is possible to use a non-optimal tool material for mechanical processing of steels and cast irons with small cutting depths of up to 1 mm and at low feed - 0.2 mm/rev. At greater depths of cutting and feeding (t > 1 mm, S > 0.2 mm/rev), temperatures in the cutting zone rise rapidly, increasing by 20-40ºС, which negatively affects the processing process and reduces the stability of the cutting tool. The originality. Optimum modes of cutting and brands of materials of parts and workpieces, which will ensure high quality of processing, have been established. Research of thermal processes of the tool-workpiece system with determination of the temperature at any point on the contact surfaces. Practical implementation. Using the application program allows you to determine the temperature of the appropriate point of the cutting wedge, simulate the distribution of the thermal field for different cutting modes (cutting depth, feed, cutting speed, tool geometry) and set their optimal values, taking into account the material of the cutter and the workpiece. This will significantly speed up the preparation of the technological process of mechanical processing, ensure the required quality and minimize costs.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":"94 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74871608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of product processing modes in modeling and programming of machining on machine tools with program control","authors":"V. Ruban, V. Derbaba, O. Bohdanov, Ye. S. Shcherbyna","doi":"10.33271/crpnmu/72.222","DOIUrl":"https://doi.org/10.33271/crpnmu/72.222","url":null,"abstract":"Purpose. To solve a scientific and technical problem related to the technological support of high-performance machining of a cast iron part by optimizing and controlling its machinability with a hard-alloy tool on multi-axis CNC machines using CAD-CAM systems. The methods. The methodological basis of the work is a systematic approach and analysis of the study of the object of research, based on the use of: numerical and graphical-analytical research methods in order to establish a systematic relationship between turning parameters and the properties of the material being processed, tool geometry and its stability, parameters of cutting modes with the corresponding indication in the control program for the CNC machine. Findings. Numerical research results have been obtained for a scientifically based approach to solving the technical problem of high-performance turning of cast iron parts on multi-axis machining centers, which contains a set of adjusted methods and algorithms for predicting their machinability with ensuring the reliability of hard alloy cutting tools. The results obtained were compared with known works related to the study of machining processes of various grades of steels, alloys, and cast irons, the assessment of the reliability of cutting tools, the accuracy and roughness of the machined surface, and the results of measurements of cutting force parameters. The maximum relative error of the calculations did not exceed 6-8%. The originality. Establishment of a complete and systematic connection of machining parameters with the properties of the processed material, tool geometry and design and technological factors of the part for the calculation of an optimized automated production technology. In the mathematical and statistical processing of experimental data, which made it possible for the first time to obtain complex dependencies in a form convenient for calculation and analysis, which give a clear picture of the effect of each parameter of the turning process on its energy and time indicators when compiling a rational technology for machining a part of complex geometric shape in a CAM system. Practical implementation. It consists in selecting and justifying the optimal geometric parameters of cutting tools and equipment, establishing the nature of the influence of the conditions of turning cast iron on the main process parameters - machining time and operating parameters depending on the hardness of the part material and tool material. Practical recommendations are given on the optimal use of CAD-CAM systems, adjustment of process results and operating parameters to obtain optimal results at the stage of production preparation.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89673341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mathematical substantiation of mine locomotive braking efficiency under pulsiting braking torque","authors":"A. Monia","doi":"10.33271/crpnmu/72.153","DOIUrl":"https://doi.org/10.33271/crpnmu/72.153","url":null,"abstract":"Purpose. Determination of braking torque parameters that provide high braking performance of a mine locomotive by mathematical modeling of the braking of a mine locomotive by a disc brake that creates a pulsating braking torque. The methods. Forced vibrations of the elements of the wheel-motor unit (WMU) of a mine locomotive in the process of braking with a disc brake are studied by the methods of differential calculus and mathematical modeling. Integration of the system of differential equations is performed by the Runge-Kutt method. Findings. A comparative analysis of a mine locomotive braking by a disc brake, which creates a constant and pulsating sinusoidal braking torque with a different number of sinusoid periods per revolution of the wheel pair, is carried out. It has been proved that the pulsating sinusoidal braking moment generated on the axle of the wheel pair equal to the sum of the constant component and the amplitude of the oscillations of the variable component multiplied by the sine of the product of the number of sinusoid periods per revolution of the wheel pair by its angular coordinate provides higher braking characteristics than the constant braking moment. It is shown that pulsating braking torque reduces the braking time and braking distance of the mine locomotive. The values of the amplitude of oscillations, which depend on the average value of the braking torque, and the number of periods of the sinusoid per one revolution of the wheelset, at which the greatest effect is achieved, are determined. The originality. For the first time, a mathematical model has been developed for braking a mine locomotive by a disc brake, which creates a pulsating braking torque on the axle of the wheel pair, depending on its angular coordinate, taking into account the nonlinear dependence of the adhesion coefficient on relative slip, on the basis of which the efficiency of a disc brake with a multi-sector disc is shown in comparison with a disc brake with a homogeneous disk under various conditions of the rail track. Practical implementation. The research results make it possible to determine the parameters of a disc brake with a multi-sector disc located on the wheelset axle and on the engine shaft, which provide the highest braking efficiency.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88078984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}