Kara Serhii
@uz.gov.ua/about/activity/science
Department of Engineering
The Rail Transport Scientific and Engineering Institute branch of JSC "Ukrzaliznytsia"
EDUCATION
Volodymyr Dahl East Ukrainian National University. Speciality: railway transport, locomotives. Bachelor, master, Ph.D.
RESEARCH, TEACHING, or OTHER INTERESTS
Modeling and Simulation, Mechanical Engineering, Mechanics of Materials
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Oleksij Fomin, Pavlo Prokopenko, Serhii Kara, Václav Píštěk, and Pavel Kučera
Elsevier BV
Oleksii Koshel, Svitlana Sapronova, and Serhii Kara
Private Company Technology Center
The object of research is strength indicators of load-bearing structures of special rolling stock (dump cars). The research problem is the appearance of the same type of cracks in the girder beams of dump cars, the repair of which is not provided for by the current repair documentation. Malfunction analysis, control tests, strength studies by calculation and experiment were carried out. The analysis of malfunctions of cars in operation helped prove the place of occurrence of fatigue defects – the girder beam. This made it possible to determine specific zones of load-bearing elements, in which during control tests of cars, on the basis of taking into account data on fatigue defects, it is necessary to measure stress parameters. The results of the control tests showed that the lowest value of the fatigue resistance reserve factor n=1.6 for the dump car is found in the zone on the girder beam in the area of the pivot beam. The value of n is within acceptable limits. Normative calculations were carried out and a separate calculation (emergency) mode was additionally defined in the SolidWorks Simulation 2019 software package (France). Based on the results of the dump car stress calculations, it was established that the maximum equivalent stresses in the load-bearing structures of the car occur during its unloading due to twisting, and the stress vectors are at an angle of 45°. During the calculation of individual load modes, the stresses exceed the permissible values. In order to ensure the necessary strength conditions, it is proposed to introduce a reinforcing pad into the girder beam of the dump car, due to which the calculated stresses are within the permissible limits. The research will contribute to devising the recommendations for the restoration of dump cars, for designing modern structures of special rolling stock, and for improving strength determination processes
Mykola Gorbunov, Serhii Kara, Olegas Lunys, and Gediminas Vaičiūnas
Springer International Publishing
Mykola Gorbunov, Václav Píštěk, Maksym Kovtanets, Olena Nozhenko, Sergii Kara, and Pavel Kučera
JVE International Ltd.
The article examines the work and key elements of the automated system for supplying abrasive material using a managed pneumatic dispensing. Proposed to manage the flow of abrasive material using continuous (for the case of emergency braking) and pulse form of dosing. Using the pulse form that allows dosing of abrasive material in a wide range, providing a number of additional options to control the sand system. Developed a functional diagram of the automatic flow of abrasive material supply system, which provides control over the flow of abrasive material and its comparison with the reference case, according to the gradation performance of the system (algorithm of dosing). The main elements of the developed system are analyzed.
Mykola Gorbunov, Juraj Gerlici, Sergey Kara, Olena Nozhenko, Ganna Chernyak, Kateryna Kravchenko, and Tomas Lack
Jan Evangelista Purkyne University in Usti nad Labem
In the article the issue of perspective running parts for freight cars of new generation is considered and additions to the outdated existing classification of bogie are developed, namely introduction of such types of suspension is suggested.The results of theoretical studies are presented by means of modeling the movement of the car in the software "Universal Mechanism" to determine the influence of the first stage of spring suspension in Barber type bogie (type 18-100 and analogues) on energy efficiency (resistance to movement) and the estimated value of the decrease in resistance to movement.A concept for a fundamentally new design of a freight car bogie for high-speed traffic has been prepared, based on fundamentally new technical solutions with elastic-dissipative bearing elements, as well as a concept for the modernization of the Barber-type bogie (type 18-100 and analogues) by introducing axle suspension on the 1520 mm gauge.
Mykola Gorbunov, Vaclav Pistek, Maksym Kovtanets, Olena Nozhenko, Sergii Kara, and Pavel Kučera
JVE International Ltd.
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.