Browsing by Author "Kovtanets, M."
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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 Development of the theory and methodology of controlling the local tribological contact thermomechanical loading.(2018) Gorbunov, M. I.; Kovtanets, M.; Kostyukevich, A.; Nozhenko, V.; Vaičiūnas, G.; Steišūnas, S.Theoretical and experimental studies have been carried out, which confirmed the fact that the contact temperature is the most important factor affecting the entire complex of service properties of the contacting materials. The authors of the paper propose the control of the frictional interaction of the tribological contact by controlling the temperature by forced cooling, which will stabilize the coefficient of engagement of the wheel with the rail.Item Experimental study of temperature stabilization process in tribological contact of brake friction pairs under the impact of forced cooling(2020) Gorbunov, M.; Prosvirova, O.; Kovtanets, M.Item Experimental study of the influence of friction surfaces cooling parameters on the efficiency of the braking system of a railway vehicle operation.(2018) Gorbunov, M. I.; Prosvirova, O.; Kovtanets, M.; Nozhenko, V.; Bureika, G.; Skrickij, V.The purpose of the study is to evaluate the effect of cooling frictional surfaces on the efficiency of the braking system by experimentally determining the coefficient of friction and the temperature of the interacting surfaces under different methods and regimes of cooling. Experimental research established that the mathematical model of the disc brake thermophysical characteristics, which takes into account the adaptive cooling system, ensures a satisfactory match of the results of calculations to experimental data; the discrepancy does not exceed 10-12%. Analysis of the experimental data obtained allows concluding that adaptive cooling of the brake friction surfaces has a positive effect on the braking efficiency. Thus, the coefficient of friction when using this system is 15-30% higher, depending on the performance and temperature of the cooling air, than without its use. The average integral temperature of surfaces in frictional interaction is lower by average of 20-30% compared to the case when adaptive cooling is not used.Item Experimental study of the limit-maximum adhesion coefficient(2020) Gorbunov, M.; Kovtanets, M.; Kovtanets, T.Item Innovative risks of introducing advanced technical solutions in transport(2020) Gorbunov, M.; Nozhenko, V.; Kovtanets, M.; Porkuyan, O.This article contains the analysis of possible investment ways for the development of industrial technologies on the example of railway transport and the associated decision-making process. A risk assessment method was used in this study when introducing innovative technical solutions for improving friction interaction in a two-point «wheel-rail» contact, which is based on the Monte Carlo method. The result of simulation modeling is forecasting of the most and least risky technical solutions for introducing them in railway transport and reducing such risks.Item Reducing the wheel-rail system wear intensity with thermomechanical impact.(2019) Gorbunov, M. I.; Kovtanets, M.; Bureika, G.; Kovtanets, T.Item Research to improve traction and dynamic quality of locomotives(2017) Gorbunov, M. I.; Pistek, V.; Kovtanets, M.; Nozhenko, O.; Kara, S.; Kučera, P.The article reviews and analyzes available theoretical and experimental studies aimed at improving the tractive and dynamic characteristics of locomotives. Based on the information received, the authors formulated the following tasks of further research to increase and stabilize traction and coupling qualities of the locomotive.Item Slipping and skidding occurrence probability decreasing by means of the friction controlling in the «wheel-braking» pad and «wheel-rail» contacts(2017) Gerlici, J.; Gorbunov, M. I.; Kravchenko, K.; Domin, R.; Kovtanets, M.; Lack, T.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 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.Item To the Emergency Stop of the Train in Case of Derailment.(СНУ ім. В. Даля, 2021) Mogila, V.; Kovtanets, M.; Kovtanets, T.; Vakulik, M.The current state of the technical base of Ukrainian railways is characterized by the critical deterioration of the rolling stock. Locomotives and cars of worn-out types lose their initial running properties over time and cause an increased impact on the train structure, thus creating a direct threat to the safety of the trains. In order to maintain the existing rolling stock in a condition that ensures that it meets the requirements of operational safety, technical solutions are required, which are taken on the basis of a scientific substantiation of their effectiveness, first of all from the point of view of ensuring the safety of traffic. Prospective plans for renewal of the fleet of vehicles involves the supply of traction rolling stock (TRS) and cars with improved technical characteristics. Because of the lack of current system of admission to the operation of new rolling stock, which would meet international standards for the requirements of traffic safety, at the time of renewal of the appropriate regulatory framework. For this purpose it is necessary to develop methods and means of evaluation of the characteristics of the rolling stock with the ultimate goal of ensuring the safety of the trains. The work is devoted to the further development of methods and means of scientific research aimed at solving the scientific-applied problem of ensuring the technical operation of the vehicle fleet as modernized by scientifically grounded technical solutions, as well as the new generation. The work presents a technical solution for improvement of the device for emergency stop of the train when the car is derailed by the fact that as a spring two rod magnets are used, one of which is fixed in the body of the pneumatic cylinder and the other on the seismic mass, and the core permanent magnets are directed one on one by one poles, which will ensure increased reliability and speed of the device. The use of the proposed design will increase the reliability and speed of the device for emergency stop of the train when the car is derailed, which contributes to improving the safety of the trains.