Перегляд за Автор "Kovtun, O.S."

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  • Ескіз
    Документ
    Electromechanical wear of the contact wire–current collecting insert pair in electric transport systems
    (Хмельницький національний університет, 2026) Kovtun, O.S.; Polishchuk, A.O.
    The article considers the processes of current collection and wear in the sliding electrical contact system "contact wire - current collection insert" of a trolleybus. It is shown that the destruction of contact surfaces has a complex electromechanical nature and is caused by the simultaneous action of mechanical, electrical and thermal factors. The main mechanisms of electrical and mechanical wear of contact elements are analyzed, in particular, electroerosion, abrasive, fatigue and molecular-mechanical wear. The influence of contact pressure, current collector speed, traction current magnitude and properties of contact pair materials on the intensity of destruction of surface layers is considered. It is shown that the uneven distribution of current in the contact zone leads to local overheating of the surface and the formation of electric arcs, which accelerate the electroerosion destruction of contact elements. It is established that the formation of a thin graphite film on the surface of the contact wire can partially reduce the friction coefficient and wear intensity. The results obtained can be used to increase the durability of current-collecting elements of electric transport and optimize their operating modes.
  • Ескіз
    Документ
    Improving the wear resistance of guides: tribological analysis, surface texture and lubricants
    (Хмельницький національний університет, 2025) Dykha, O.V.; Dytyniuk, V.O.; Kovtun, O.S.; Fasolia, V.O.; Hetman, M.V.
    The article considers the main failure modes of guides, in particular wear and contact fatigue, which depend on friction between contact surfaces. The influence of tribological parameters, in particular surface roughness and lubricating structures, on the operational characteristics of linear guides is studied. Particular attention is paid to the dynamic behavior of guides, which determines the accuracy and stability of mechanical systems. To predict wear, mathematical models based on the Archard and Hertz theories were used, which allow estimating load distribution and contact deformations. The influence of lubricants, in particular molybdenum disulfide and hexagonal boron nitride, on reducing the friction coefficient and improving antifriction properties was separately studied. The prospects for using new materials, such as cubic boron nitride, to increase the wear resistance of guides are considered. Methods for optimizing the load between rolling elements, which contributes to increasing the durability of guides, are proposed. The results obtained can be used to improve the designs of high-precision mechanical systems and reduce operating costs.