Наукові публікації та патенти в рамках виконання держбюджетних науково-дослідних робіт 2020 р.
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Browsing Наукові публікації та патенти в рамках виконання держбюджетних науково-дослідних робіт 2020 р. by Author "Mikhailov, E."
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Item Clarification of features of the wheel movement with a perspective constructive scheme on a rail(2020) Mikhailov, E.; Semenov, S.; Kliuiev, S.; Dižo, J.; Blatnický, M.; Gerlici, J.; Harušinec, J.; Kovtanets, M.The article presents the continuation of studies of the features of the wheel movement the traditional and perspective constructive scheme on a rail. Unlike the traditional design, the perspective constructive scheme of the wheel allows independent relative rotation of the support surface wheel and of its guide surface (flange) relative to their common axis of rotation. Previous authors’ works did not take into account the influence of the level of slippage in the main contact of the wheel with the rail on the value of the slippage rate in its flange contact. This article further examines the influence of this factor for both wheel designs. The results of the presented studies confirm the possibility of reducing slippage in the flange contact with the rail for a wheel of a promising design scheme in comparison with a traditional wheel. Reducing the power of friction forces in the contact of the wheel flange of a promising design scheme will reduce the resistance to movement of such a wheel along the rail, especially in curved track sections.Item Study of rail vehicles movement characteristics improvement in curves using fuzzy logic mechatronic systems(2019) Kapitsa, M.; Mikhailov, E.; Kliuiev, S.; Semenov, S.; Kovtanets, M.The article deals with the effectiveness of reducing the level of force interaction of the rail vehicle wheels with rails in curved sections of the track through the use of mechatronic position control systems for wheel pairs in the rail gauge in the horizontal plane. The approaches to the creation of such a mechatronic system operating on the principles of fuzzy logic are described. To determine the angles of attack of wheels on the rails, it was proposed to use the acoustic emission indicators of the contact of the wheel with the rail. To determine the direction of curvature of the rail track, it is advisable to use data from navigation systems. The study of the dynamics of the rail vehicle during the passage of a curved section of the track in real time was carried out using the Matlab/Simulink software package. The proposed mechatronic control system for the position of the wheel sets in the horizontal plane allows to ensure their optimal installation under various driving conditions in the rail gauge. This makes it possible to minimize the angles of attack of the wheels and reduce the forces of the horizontal interaction of the wheels with the rails.Item The issue of improving of the design of a railway wheelset(2020) Mikhailov, E.; Semenov, S.; Dižo, J.; Blatnický, M.; Kovtanets, M.; Kliuiev, S.The article analyses one of the significant drawbacks of traditional wheelsets of rail vehicles, which consists in the occurrence of elastic deformations of bending of its axis in operation. It has been established that this is due to the irrational scheme of transferring vertical loads from the topsides of the rail vehicle. The magnitudes of these angles determine the additional (elastic or plastic) displacements of the points of the contact of wheels with the rails transversely of the rail gauge when the wheelset is subjected to the static and dynamic loads during the movement. A possible way to eliminate this disadvantage of the traditional wheel pair is to change the loading scheme of its wheels with vertical loads. This is possible to perform by changing the traditional design of a wheelset and abandoning its traditional axis using independently rotating wheels (IRW). The use of wheel pairs with IRW eliminates another significant disadvantage of traditional wheelsets. It is associated with high torsion stiffness of the axles of such structures, which does not allow the wheels to rotate relatively to each other. This causes increasing of wheel slip on rails when moving in curved sections of the track and it also limits the speed of steady movement of rail vehicles in straight tracks. However, when using wheel pairs with the IRW, they are not centred in the rail gauge. At the same time there is long contacting of a flange of one of the wheels on the rail with a high level of wear. Improving the dynamics of rail vehicles with IRW and reducing wear of wheels and rails is possible by means of mechatronic systems to control the position of wheelsets in the track gauge.