Факультет "Транспортна інженерія" (раніше ф-т "Механічний")
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ENG: Faculty of "Transport Engineering" (formerly Faculty of Mechanical Engineering)
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Browsing Факультет "Транспортна інженерія" (раніше ф-т "Механічний") by Author "Babyak, Mykola O."
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Item Improving the Dependability Evaluation Technique of a Transport Vehicle(Kaunas Univ. of Technology, Lithuania, 2020) Babyak, Mykola O.; Neduzha, Larysa O.; Keršys, RobertasEN: The safety of vehicles depends on the dependabiliti of its elements, which should guarantee the trouble-free operation throughout the entire service life. The concepts of "safety" and "dependabiliti" for the vehicle are inseparable. Therefore, all structural components throughout the entire service life before the onset of the limit state must guarantee trouble-free operation of rolling stock with the installed system of maintenance and repair, i.e. be in working condition as long as possible and perform all necessary functions. Regarding the relevance in predicting the technical condition of a vehicle, authors present improving the dependabiliti evaluation technique of its facility by the value of a safety factor. The impact of actual operating conditions of rolling stock on durability and operability (on the example of a pantograph) is taken into account. The nearest relation between the dependabilitiof a structure and a safety factor and parameters of probability distributions of stresses is determined. Improving the technique can be used to evaluate the dependabiliti of the facility from the viewpoint in the individual prediction of operability and life of the structural elements for the vehicle based on observations over the process of their wear. This will increase the safety and dependabilitiof operation for all complex structures.Item Relationship Between Rolling and Slip Resistance in Rolling Bearings(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2016) Bondarenko, Lеоnid M.; Babyak, Mykola O.; Yakovliev, Serhii O.; Istin, S. О.; Moskalev G. Yu.ENG: Purpose. About one of the causes of slip rolling is known from the second half of the 19th century, it was believed that the slip resistance appears at the place of contact due to different speeds on the arc of contact. Only in the mid-20th century it was proved that this resistance is negligible in rolling resistance. However (for some unknown reason) it is ignored the fact that in practice in rolling bearings may rotate both the inner ring with a stationary outer one, and vice versa almost in equal relations. It is not taken into account the fact that the ball or roller in the rolling bearings runs the different distance along the roller path of the outer and inner bearing cages in one revolution. This fact is not taken into account in determining the calculated values for the friction coefficient of a rolling bearing reduced to the shaft. Therefore, the aim of this work is to determine the influence of path length on the track riding the outer and inner race of the bearing on the determination of the calculated value of the coefficient of friction of rolling bearings is given to the shaft. Methodology. The solution technique is based on the theory of plane motion of a rigid body, the theory of Hertzian contact deformation and the analytical dependencies for determination of coefficient of rolling friction. Findings. The obtained dependences on determination of rolling resistance of the balls or rollers along the bearing tracks of inner and outer bearing cages as well as path difference metering of the rolling on them allows to analytically obtain the rolling resistance and slipping for any size of bearings and different devices of bearing units. It is also possible at the design stage of rolling nodes to handle not only the design but also the content of the node. Originality. Using the analytical dependences for determination of the rolling resistance of bodies at point and line contacts, and also account for the difference in the path of the rolling ball or roller on the outer and inner cages of the bearing one can more accurately find the rolling resistance in the bearings. Practical value. The obtained dependences allow designing the bearing units with minimal energy consumption.Item Simulating the Operation of the Pantograph-type Current Collector(KTU leidykla „Technologija“, Kaunas, Lithuania, 2022) Babyak, Mykola O.; Kalivoda, Jan; Neduzha, LarysaENG: The usage of electricity to increase the safety and environmental friendliness of transportation is a very important issue. The common feature in the work of different types of electric transport is the dependence on reliable contact with the conductor from which it receives power. The reliability of the constant movable contact between the conductor with current and electrical equipment depends on the precise operation of the pantograph complex mechanism. To simplify the planning calculations and approbation of structures, a pantograph model with two degrees of freedom is proposed. It gives an adequate description of the real system and improves the mathematical apparatus while calculating the forces and dynamic displacements of the pantograph mechanisms for electric transport.Item Transportation Optimization of Homogeneous Freight in the Transport Systems(KTU leidykla „Technologija“, Kaunas, Lithuania, 2022) Babyak, Mykola O.; Neduzha, LarysaENG: There are situations where, due to various circumstances, a large number of direct routes in the freight traffic running (which were traditionally used) can not satisfy transport users. Then there is a need to find new routes for the transportation of freight from departure points to destinations. The authors present an example to solve the transport task for the setting transportation routes in an extensive network, taking into account the specifics of transportation of homogeneous freights on concrete sections of railways. This allows optimizing the plan of transportation for homogeneous freightes in the transport systems. This is relevant for the development of new transport routes, especially in modern conditions.