Кафедра електроніки, фізики та СМАРТ-систем

Постійне посилання на фондhttps://repository.lntu.edu.ua/handle/123456789/80

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2021 - 20255

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Автор: search.filters.author.Zabolotnyi, OlegКвартиль та наукометрична база: search.filters.custom_quartile.Scopus (Q4)

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Зараз показуємо 1 - 5 з 5
  • Ескіз
    Item type:Наукова стаття,
    Methods of Evaluating the Wear Resistance of the Contact Surfaces of Rolling Bearings
    (2021) Svirzhevskyi, Kostiantyn; Zabolotnyi, Oleg; Tkachuk, Anatolii; Zablotskyi, Valentyn; Cagáňová, Dagmar
    In modern conditions of development of mechanical engineering, high priority is given to experimental and material science aspects of assessing the wear resistance of conjugate friction surfaces, which consist of the selection of materials with high wear resistance characteristics. However, this way, you can only reduce the intensity of the wear process, but not control the wear process itself and, most importantly, the changes in the state and performance of the mating surfaces that occur as a result of the wear process. The durability of machines is laid down at the design stage and depends on the design scheme, materials used, lubricants, and other factors. An increase in the durability of mated machine parts is impossible without creating modern engineering methods for calculating wear resistance, which would consider the physical and mechanical characteristics of materials (friction pairs, modes of operation of the load node, and angular velocity), external friction conditions (environment, and lubrication), as well as the design and technological features of the friction interface. During the wear of two contiguous bodies, the unevenness of one surface is exposed to the unevenness of the other surface. In this case, the irregularities of the more durable material act similarly to the abrasive elements, cutting off the thin chip from the micro-irregularities of the surface of the less durable material. At the same time, the irregularities that cut this chip wear themselves out, just as cutting abrasive tools wear out.
  • Ескіз
    Item type:Наукова стаття,
    Modeling the Dynamics of Centerless Mortise Grinding on Rigid Supports
    (2025) Chalyj, Vasyl; Moroz, Serhii; Tkachuk, Anatolii; Zablotskyi, Valentyn; Zabolotnyi, Oleg
    The paper examines the influence of the dynamic parameters of the machine and the geometry of the adjustment of rigid supports on the formation of undulations of the surfaces of roller bearing rings. A complex mathematical model of the machine tool system for centerless mortise grinding was developed, and the influence of the dynamic parameters of the machine tool and the geometry of the setup of rigid supports on the formation of undulations of the processed surfaces was analyzed. The SWaAGL-50 mortise centerless grinding machine’s technological system is presented as a linear mechanical model, and the elastic movements along the ОХ axis are considered. Based on the equations of kinetic and potential energies compiled in the form of Lagrange, the equations of motion of the relevant elements of the technological system were obtained. The formula of the dynamic accuracy function was found, which characterizes the inconsistency of the movement of the grinding wheel and the part.
  • Ескіз
    Item type:Наукова стаття,
    Increasing the Speed and Performance of the Drupal CMS Server for Industrial IoT Technologies
    (2023) Satsyk, Viktor; Cagáňová, Dagmar; Reshetylo, Oleksandr; Zabolotnyi, Oleg; Tkachuk, Anatolii
    In this paper, the methods of increasing the speed and performance of the Drupal CMS-based server in IIoT technologies were analyzed. Three main load parameters were taken into account: processor time (CPU), level of server RAM usage, and disk memory usage level; on three pages of the WEB site (main, list of blogs, and a page with one blog) and two research methods were applied: generalized and detailed. Based on the results of the analysis of four options for optimizing Drupal CMS for IIoT technologies: basic, using additional installed modules, servers, and configurations, and Drupal Hooks, effective, simple, cost-effective methods were synthesized that guarantee an increase in server speed and productivity. It was found that the optimization of configurations and Drupal Hooks is the most effective since after its implementation, the response of a page with one blog increased by 9.32 requests per second; built-in optimization is extremely simple to implement and inefficient, while server-side optimization is inefficient, most complex and expensive to implement.
  • Ескіз
    Item type:Наукова стаття,
    The Structure of Automated Control Systems for Precision Machining of Parts Bearing
    (2022) Trokhymchuk, Ivanna; Svirzhevskyi, Kostiantyn; Tkachuk, Anatolii; Zabolotnyi, Oleg; Zablotskyi, Valentyn
    One of the ways to improve the quality of bearing parts is the introduction of automatic control systems to improve the technological reliability of machines and increase the accuracy of machining of roller bearing rings. A significant advantage of these systems is that it is possible to compensate for technological factors by cheaper means compared to such as increasing the rigidity of the technological system, processing in modeswith lower productivity, processing using more passes, usingmanualmethods to compensate for wear of cutting tools, maintaining the required rigidity of the machine and the accuracy of its elements through periodic repairs. These methods are associated with either a loss of cyclical productivity or a significant loss of unproductive nature. Therefore, the errors of automated control systems should be considered as processing errors or as a scattering field of the dimensions of parts manufactured on a machine equipped with an automatic control system for precision machining. The share of error of the most automated control system in the total balance of the total size error is quite small and does not exceed 10…20%. The task of improving the accuracy and ensuring stability in technological systems is complex, so it is solved only by a comprehensive method by improving the accuracy of all elements of the technological system. Thus, automated control systems for precision machining of bearing parts is one of the main subsystems of flexible automated production in the concept of Industry 4.0.
  • Ескіз
    Item type:Матеріали конференцій,
    Basic Stations Work Optimization in Cellular Communication Network
    (Springer International Publishing, 2021) Tkachuk, Anatolii; Zablotskyi, Valentyn; Zabolotnyi, Oleg; Cagáňová, Dagmar; Yakymchuk, Nataliia
    The paper proposes an algorithm that automatically determines the test data amount, depending on the bandwidth of the network channel, so the measurement procedure eliminates operator error. This is especially true during daily measurements, which are carried out on different days of the week. Daily measurements allow to estimate the base station single sector workload, a small area or the entire network as a whole. It is necessary to analyse the network operation and to optimize its problem areas. According to the results of the research, the authors of the paper revealed the hours of maximum and minimum load and load extrema, which is characterized by the fact that the number of subscribers using the cellular network for voice calls or data transmission is the maximum. The regularity of cases when the subscriber terminal is registered in the network but it is impossible to make a voice call or transmit data is revealed. If such a case is isolated, there is no need to change the network or perform optimization. However, if the network overload occurs at certain intervals, it is recommended to optimize the problem area of the network by dynamic power control or installation of an additional transmitter. This method of adjusting base station receivers is suitable for use in 4G and 5G networks.