4_2022_sen_11

Title of the article MODELLING OF GEOMECHANICAL STATE OF THE ROCK MASS DURING THE LARGE SCALE MINING OF UNDERGROUND SPACE
Authors

ZHURAVKOV Michael A., D. Sc. in Phys. and Math., Prof., Head of the Department “Theoretical and Applied Mechanics”, Belarusian State University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

NIKOLAITCHIK Mikhail A., M. Sc. in Phys. and Math., Head of the Research Laboratory “Applied Mechanics”, Belarusian State University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KLIMKOVICH Mikita M., Master’s Student of the Mechanics and Mathematics Faculty, Belarusian State University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section GEOMECHANICS
Year 2022
Issue 4(61)
Pages 97–104
Type of article RAR
Index UDK 539.3+51-74, 539.214, 539.424, 622
DOI https://doi.org/10.46864/1995-0470-2022-4-61-97-104
Abstract The article considers the mechanical and mathematical modeling of the process of subsidence of the Earth’s surface during the mining of rock mass by a pillar mining system. The task is to study the influence of the waste space on the state of the rock strata located at different depths (Horizons) at each stage of the process of rock movement. The purpose of the study is to develop a numerical geomechanical model of a rock mass using a pillar mining system, which makes it possible to correctly identify the characteristic zones formed as a result of mining operations in the rock column, and also provides an opportunity to simulate the process of formation of the daily surface subsidence trough. Computational numerical schemes of model problems are constructed using finite element and discrete element modeling algorithms. Based on the results of numerical modeling, it is shown that the characteristics (linear dimensions and maximum subsidence) of the subsidence trough obtained in accordance with the developed geomechanical model are close to the characteristics calculated by the engineering methodology used in the conditions of the Starobin potassium salt deposit (Republic of Belarus). At the same time, as the depths of mining operations increase, the discrepancies between them increase. The analysis of the reasons for this behavior is carried out. The nonlinear nature of the change in the boundary angles of displacement in the layers of the rock strata with an increase in the depths of mining is presented and conclusions explaining these changes are noted. The application of the obtained modeling results is to substantiate the possibility of reducing the size of the security pillars around the mine shafts and ground objects with an increase in the depths of mining operations, thereby reducing the amount of mineral reserves left in the bowels and increasing the economic indicators of extraction.
Keywords finite element modeling, block elements, Coulomb–Mohr model, layered rock mass, pillar mining system, zone of collapse, zone of fracturing, boundary displacement angles, displacement trough
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4_2022_sen_10

Title of the article ON THE CHOICE OF MODERN STRUCTURAL METAL MATERIAL FOR HIGH-DUTY MECHANICAL SYSTEMS. PART 2
Authors

SOSNOVSKIY Leonid A., D. Sc. in Eng., Prof., Professor of the Department “Locomotives”, Belarusian State University of Transport, Gomel, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section TRIBO-FATIGUE SYSTEMS MECHANICS
Year 2022
Issue 4(61)
Pages 89–96
Type of article RAR
Index UDK 669.13.018; 669.131.7
DOI https://doi.org/10.46864/1995-0470-2022-4-61-86-96
Abstract It is shown that when solving the problems of assurance of quality, reliability, competitiveness of high-duty mechanical systems, metal and a complex of its mechanical and service properties are of fundamental importance. Steel cast iron MONICA (Mo–Ni–Cu) (patent BY, no. 15617) exhibits an unconventional and unique ability to lose brittleness (increase viscosity) with increasing strength. In terms of service properties, it is not inferior to alloyed heat-strengthened steels. This makes it possible to recommend it for the manufacture of many and various highly loaded parts and assemblies of modern technology. The article provides several examples of the effective use of MONICA for the manufacture of cast knives for cutting and chopping devices of forage harvesters (Hi-Tech), large-sized gear wheels with a diameter of 500 mm for final drives of agricultural combines (know-how), as well as experimental cast rails for railway transport (Hi-Tech). A complex of laboratory and full-scale tests has convincingly proved that one brand of the new structural material fully provides the required operational reliability of many and different tribo-fatigue systems, the performance of which is determined by many and different criteria (fatigue, wear, friction, crack resistance, etc.) under the action of high repetitive variables and shock-cyclic loads. This determines the unconditional efficiency and competitiveness of critical mechanical systems (tribo-fatigue systems) for modern machines and equipment.
Keywords metal; mechanical and service properties; limits of strength, fatigue, crack resistance; wear resistance; stress-strain and limit states; modification; microstructure; MONICA
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4_2022_sen_8

Title of the article METHODOLOGICAL RECOMMENDATIONS ON TOPOLOGICAL OPTIMIZATION OF POWER STRUCTURES USING NUMERICAL MODELING TOOLS
Authors

IVCHENKO Vadim I., Deputy Head of the Republican Computer Center of Mechanical Engineering, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

SHMIALIOU Aliaksei V., Ph. D. in Eng., Deputy Director General for Research, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

TALALUEV Aleksey V., Head of the Republican Computer Center of Mechanical Engineering, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

OMELIUSIK Aleksey V., Junior Researcher of the Republican Computer Center of Mechanical Engineering, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section COMPUTER MECHANICS
Year 2022
Issue 4(61)
Pages 68–79
Type of article RAR
Index UDK 004.942
DOI https://doi.org/10.46864/1995-0470-2022-4-61-68-79
Abstract Methodological recommendations are proposed for the development of the process of topological optimization of load carrying structures adapted for the use of additive technologies. The stage of postprocessing of the polygonal geometry of the part generated as a result of optimization is considered in detail. The validation stage is included in the process of topological optimization by comparing the calculated and experimental data to assess the operability (strength) of the optimized structure. For the option of manufacturing load carrying structures by 3D printing, it is planned to conduct studies of the mechanical properties of the material obtained on a 3D printer, taking into account the printing settings and the orientation of the material layers relative to the applied load during testing. An example of approbation of the proposed methodological recommendations is given on the example of a load carrying hook included in the design of a wheeled transport anti-ram device. The optimization was performed in the SolidThinking Inspire software environment (Altair Engineering, USA). The results of the calculated and experimental determination of the destructive load are presented for the initial and optimized hook design. For the experiment, the hooks were made of ABS plastic using FDM technology. Finite element models of hooks were developed in the ANSYS Workbench software package (ANSYS, USA). Assignment of material properties, boundary conditions and applied load is performed in the LS-PrePost application, calculation in the LS-DYNA solver (ANSYS, USA). The calculated and experimental efficiency estimates were 44.4 and 57.8 %, i.e. their difference is within 13.4 %. The zones and the nature of the destruction identified by calculation and experimentally completely coincide. The results obtained confirm the correctness of the proposed methodological recommendations, the selected modeling approaches and the determination of the properties of the material of the structure manufactured by 3D printing.
Keywords computer-aided design, modeling, topological optimization, methodology, power structure, weight reduction, stiffness increase, strength, ABS plastic, 3D printing, FDM technology
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4_2022_sen_9

Title of the article GENERALIZED SOFTWARE STRUCTURE OF THE V2X COMMUNICATION PLATFORM AS PART OF THE ONBOARD INFORMATION AND ANALYTICAL SYSTEM
Authors

HOLOD Egor A., Junior Researcher of the Department of Active Safety and Control Systems, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KARPUK Nikolay V., Deputy Head of the Department of Active Safety and Control Systems, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

DUBOVSKY Vladimir A., Ph. D. in Eng., Senior Researcher of the Department of Active Safety and Control Systems, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

ISAEVICH Michael V., Deputy Head of the Scientific and Technical Center — Head of the Special Design Bureau, OJSC “Ekran”, Borisov, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section COMPUTER MECHANICS
Year 2022
Issue 4(61)
Pages 80–85
Type of article RAR
Index UDK 612.76
DOI https://doi.org/10.46864/1995-0470-2022-4-61-80-85
Abstract Currently, the world’s largest automakers are paying special attention to the development of automated driving technologies. Increasing the level of vehicle automation improves traffic safety and efficiency. For this purpose, a set of algorithms based on artificial intelligence, specialized devices and sensors for navigation and assessment of the road situation are used. Another way to increase the level of automation is the use of V2X technologies, which allow vehicles to communicate wirelessly with all road users. The implementation of these functions requires the availability of special services, high quality transport infrastructure, specialized roadside equipment, as well as on-board communication platforms, which include V2X modules. The article provides an overview of the known V2X on-board modules, indicates the main functions of the developed V2X communication platform. International regulatory standards for DSRC and C-V2X technologies are noted, including recommendations and requirements for the hardware of onboard equipment. An additional composition of the software for the onboard information and analytical system for interaction with the V2X communication platform is determined. A block diagram is described and a preliminary software package for a breadboard model of the V2X communication platform is considered. The requirements are clarified for hardware and software resources.
Keywords DSRC technology, C-V2X technology, V2X platform, onboard information and analytical system, CAN interface
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4_2022_sen_7

Title of the article FORMATION, STRUCTURE AND PROPERTIES OF MODIFIED WITH FORSTERITE MICROARC OXIDATION COATING ON МЛ10 (ML10) MAGNESIUM ALLOY
Authors

KOMAROV Aleksandr I., Ph. D. in Eng., Head of the Laboratory of Modification Technologies of Engineering Materials, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

ROMANIUK Alexandra S., Researcher of the Laboratory of Modification Technologies of Engineering Materials, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

SHIPALOV Dmitriy A., Electrical Engineer of the Laboratory of Modification Technologies of Engineering Materials, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section MECHANICAL ENGINEERING MATERIALS AND TECHNOLOGIES
Year 2022
Issue 4(61)
Pages 61–67
Type of article RAR
Index UDK 621.794.61
DOI https://doi.org/10.46864/1995-0470-2022-4-61-61-67
Abstract The structure, phase composition, microhardness, and adhesive strength of a coating on an МЛ10 (ML10) magnesium alloy modified with Mg2SiO4 forsterite during microarc oxidation (MAO) have been studied. Sodium silicate additives were used as a forsterite precursor. A pattern has been established that reflects the minimum concentration of sodium silicate in the electrolyte composition, at which silicon compounds participate in the formation of a ceramic coating on magnesium and are introduced into it, forming complex compounds (Mg2SiO4). With the chosen MAO parameters and the basic composition of the electrolyte, the modification with silicon compounds begins with a concentration of sodium silicate in the electrolyte of 4 g/l. It has been established that at this concentration, a developed interface is formed, which increases the adhesive strength of the coating. In addition, the presence of forsterite in the coating leads to an increase in the thickness and microhardness of the coating.
Keywords microarc oxidation, zirconium oxide, magnesium alloy, modification, forsterite, microstructure, phase composition, microhardness
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