Кафедра "Локомотиви"
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ENG: The department "Locomotives"
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Browsing Кафедра "Локомотиви" by Author "Bolzhelarskyi, Yaroslav V."
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Item Determination of Integrated Indicator for Analysis of the Traffic Safety Condition for Traction Rolling Stock(Kaunas University of Technology, Kaunas, Lithuania, 2018) Bodnar, Borys Ye.; Bolzhelarskyi, Yaroslav V.; Ochkasov, Oleksandr B.; Hryshechkina, Tatyana S.ENG: Traffic safety is a major priority in railway transport operation. Locomotive facility is one of the responsible units in general system of railways. A complex and cumbersome system of indicators is used in locomotive facilities to analyze the operation. The existing system makes it difficult to analyze the general level of work organization in the locomotive facilities. Purpose of the study is to determine the methodology of forming a certain dimensionless indicator (or group of indicators) that will reflect the general level of safety in the locomotive facilities. As the research methodology it was chosen principal component analysis as the corresponding mathematical apparatus, which makes it possible to analyze the existing indicators characterizing the performed work and the traffic safety condition with the necessary degree of informativity. As a result, the main components and the degree of their influence on the general level of traffic safety in the locomotive facilities are set. The indicators that have the most influence on the technical and safety components of the integrated indicator of traffic safety condition are determined. Originality of the work is that it for the first time proposes the concept of index of traffic safety condition and the method of its determination using the principal component analysis. Practical value of the work lies in the fact that the ranking of technical and safety components according to the degree of their influence on the general traffic safety index has been performed. Also, the locomotive units which have the greatest influence on the traffic safety condition and reliability were determined.Item Mathematical Model of the Derailed Train Wheel Motion(Silesian University of Technology, Poland, 2016) Bodnar, Borys Ye.; Bolzhelarskyi, Yaroslav V.; Laushnyk, Igor P.ENG: It is developed a mathematical model of the derailed train wheel motion, which makes it possible to determine a change in its speed when moving on the track panel. When constructing the model the methods of theoretical mechanics and train traction were used. It was found that the highest speed reduction occurs as a consequence of the wheel impact on the sleeper. The model allows creating a generalized mathematical model of the train motion in the emergency mode.