Browsing by Author "Fomin, Oleksij V."
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Item Determination of Up-To-Date Directions of Development of Domestic System of Testing and Certification of Railways Rolling Stock("Ukrmetallurginform" STA", Ltd, Dnipro, 2016) Fomin, Oleksij V.; Murashova, Nataliia H.; Shvets, Angela A.EN: In the paper, researches results of development of system of tests devoted to up-to-date directions determination and certification of rolling stock and its components are provided. Necessity of synchronization of diagrams and domestic standards of test and certification activities in the field of rolling stock with European legislation is proved. Results and features of the experience analysis of appropriate types of activity of the European countries advanced enterprises are provided.Item Experimental Studies on the Strength of a Flatcar during Shunting Impacts(MDPI, Basel, Switzerland, 2023) Vatulia, Glib; Gerlici, Juraj; Lovska, Alyona O.; Fomin, Oleksij V.; Okorokov, Andrii M.; Pavliuchenkov, Mykhailo; Petrenko, Dmytro; Kravchenko, OleksandrENG: The increasing demand for container transportation makes it necessary to equip the wagon fleet with appropriate flatcars in good technical condition. The study deals with the determination of the strength of the flatcar during shunting impacts using the finite element method. The flatcar model 13-401 modernized with fixed fittings for securing containers on the frame was used as a prototype. The authors determined the fields of the maximum equivalent stresses in the bearing structure of a flatcar. The strength calculation was made in SolidWorks Simulation. It was found that, during a shunting collision, the maximum equivalent stresses to the flatcar were about 418 MPa and they were concentrated in the fixed fittings. The strength was also studied using the method of electric strain gauging. The research included different impact speeds. The test results showed that the maximum difference between the stresses obtained theoretically and experimentally was 17.0%. The strength model of the flatcar was tested using the Fisher criterion. The study demonstrated that the damage to the bearing structure of the flatcar and containers could be reduced when applying an improved interaction diagram.Item Research into a Possibility to Prolong the Time of Operation of Universal Semiwagon Bodies that Have Exhausted Their Standard Resource(НВП ПП «Технологічний Центр», Харьків, 2018) Okorokov, Andriy M.; Fomin, Oleksij V.; Lovska, Alyona O.; Vernigora, Roman V.; Zhuravel, Irenа L.; Fomin, Volodimir V.ENG: The intensification of utilization of railroad cars predetermines the wear of their bodies as the most loaded element of design and necessitates the introduction of new cars. To reduce the cost of manufacturing new car designs, it is proposed to prolong the operation of universal open top wagon bodies beyond standard 1.5 operation terms. When carrying out calculations for strength under conditions of wagon building enterprises, the normative magnitudes of loading are applied, which do not take into consideration possible wear in the elements of bearing structures of open top wagon bodies under operation. This can lead to a significant error when determining a possibility to extend a period of operation of open top wagon bodies that have exhausted their standard resource. Therefore, when substantiating a possible prolongation of the operation period of cars it is important to take into consideration, at the stage of strength estimations, the refined magnitudes of dynamic loads acting on them in operation. To investigate dynamic loading acting on a open top wagon body during an impact at shunting, which is the case of the greatest loading to its structure, we employed mathematical modeling. The results of present research allowed us to conclude that the acceleration that acts on the bearing structure of a open top wagon with the wear characteristic of 1.5 terms of operation during an impact at shunting is about 4g. In addition, research into dynamic loading of the bearing structure of a open top wagon body during an impact at shunting was performed using computer simulation based on the software CosmosWorks. The research results showed that the maximum accelerations of a open top wagon body make up approximately 5g. To verify the adequacy of the developed models, we used the Fisher criterion. Results of the calculations have shown that the hypothesis of adequacy is not contradicted. The research results obtained were taken into consideration when determining strength indicators of a open top wagon body with the wear characteristic of 1.5 terms of operation. To this end, we constructed a spatial computer model of the body of a base open top wagon, model 12-757, whose bearing elements are of the thickness corresponding to the minimally defined one. The calculation employed a method of finite elements. Based on the performed calculations it was determined that the maximum equivalent stresses do not exceed the permissible ones and make up about 345 MPa, which makes it possible to draw a conclusion about the possibility of further utilization of a railroad car. The study conducted would help determine the feasibility of prolongation of service operation of open top wagons that have exhausted their standard resource.Item Transversal Displacement of Freight Wagons Bogies(Published by AIP Publishing, 2019) Fomin, Oleksij V.; Shvets, Angela O.; Hauser, Vladimír; Prokopenko, PavloEN: This paper is focused to the study of the influence of lateral displacement of open box type cargo wagon bogies on their main dynamic indicators and indicators of the interaction of rolling stock with rails. The theoretical study was carried out using the model of spatial oscillations of the five wagons set. During the calculations, the change in the angle of rotation of the central axis of the wagon body was considered, which leads to a mutual transverse displacement of the bogies. As a result of research, the dependences of the indicated indicators of a freight wagon on the magnitude of the angle of rotation of the body and speed of movement were obtained.