Problems of Tribology = Проблеми трибології - 2022 рік

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https://elar.khmnu.edu.ua/handle/123456789/11892

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Перегляд Problems of Tribology = Проблеми трибології - 2022 рік за Автор "Makovkin, O."

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  • Ескіз
    Документ
    Thermal comfort formation of the bus interiordepending on the power unit layout
    (Хмельницький національний університет, 2022) Holenko, K.; Voichyshyn, Y.; Horbai, O.; Burian, M.; Popovych, V.; Makovkin, O.; Голенко, К.Е.; Войчишин, Ю.В.; Горбай, О.З.; Бур’ян, М.В.; Попович, В.В .; Маковкін, О.М.
    Energy consumption and thermal comfort are among the issues that research engineers of heating, ventilation and air conditioning systems deal with when investigating the most feasible solutions for their implementation. Existing methods of thermal comfort assessment are not optimized in two important and interrelated aspects: achieving thermal comfort(a) at the lowest possible energy consumption(b). Thermal comfort is situationally achieved when occupants perceive the ambient temperature, humidity, air movement and thermal radiation as ideal and do not prefer warmer or colder air or a different humidity level. Thermal comfort is defined by ASHRAE Standard 55 as a subjective concept characterized by the sum of sensations that create physical and mental well-being in a person. That is, he /she is in a state in which he/she feels comfortable and does not need to change one or more environmental parameters. Many studies have been conducted according to the international standards for thermal comfort in vehicles. The presence of a large number of people in the bus leads to a deterioration of the air quality in its interior. The loss of quality is mainly caused by gases resulting from breathing and other organic particles. The presence of moisture, combustion products, particles can also reduce the air quality in the interior. Air quality is affected by the design features of heating, ventilation and air conditioning systems, which largely depend on the location of the power unit, which is the subject of the research. The influence of the bus enginelayout is analysed in the presented work: for the rear- engine layout, the location of the engine vertically in the interior and other cases are also considered. Special fans are installed in the engine compartment to remove heat emitted by the engine.
  • Ескіз
    Документ
    Tribological properties of anode-spark coatings on aluminum alloys
    (Хмельницький національний університет, 2022) Dykha, O.; Babak, O.; Makovkin, O.; Posonskiy, S.; Диха, О.В.; Бабак, О.П.; Маковкін, О.М.; Посонський, С.Ф.
    It is established that at present the technology of anode-spark coatings in general is well studied. However, the lack of recommendations for the choice of modes of technological processes and tribological characteristics in different operating conditions limit the widespread introduction of this technology. The task of this work was to analyze the processes of anode-spark coatings, improve technology and study the wear resistance of samples processed by this and traditional anode technology. The development of technology for the application of protective coatings on valve metals in the conditions of spark discharge included the choice of electrolyte and mode of operation of the bath: voltage, current density, hydrodynamic conditions and other parameters. Wear resistance tests were performed on a special installation. Structurally, the installation is made in two positions, which allows you to test two samples with different load conditions at a constant sliding speed. The design of the installation implements the friction scheme of the liner shaft. The study of anode-spark coatings in the mode of limiting lubrication was studied in the environment of industrial oil. The wear criterion was the weight wear of the samples according to the results of weight measurements before and after wear. It is established that prolonged electrolysis in the conditions of sparking leads to the formation of anode coatings that exceed in their properties the films obtained by non-sparking oxidation. Comparative studies of the wear resistance of anode-spark coatings and galvanic anode coatings under the same test conditions showed that the wear of anode-spark coatings is almost twice lower for the entire load range. The considered technology is recommended for increase of wear resistance of elements of devices from the aluminum alloys working in the conditions of corrosion and mechanical wear.