Browsing by Author "Zhuravel, Irenа L."

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Especially the Functioning of Railway Stations in the Conditions of the Organization of Transport Dangerous Goods
(Дніпропетровський національний університет залізничного транспорту ім. академіка В. Лазаряна, Дніпропетровськ, 2016) Kozachenko, Dmytro M.; Zhuravel, Irenа L.; Zhuravel, Vyacheslav V.
ENG: Purpose. Ensuring a sufficient level of transport safety is an important task in the context of development of railway transport as a part of international transport corridors and under increasing freight traffic volumes. The intensification of the transport process when there is the significant depreciation of fixed assets actualizes the development and implementation of methods to of improving the safety of railway transportation of dangerous goods, as well as technological and organizational measures, which are directed decrease of risks of emergency situations with its goods. Methodology. The methods of system analysis and theory of the railways operating management were used. Findings. The regulatory framework of the dangerous goods transportation by rail was characterized. The main indicators of the dangerous goods transportation under modern conditions of railway transport functioning were investigated. A detailed structure of the factors, which influence on the stations operating conditions during the transportation of dangerous goods was developed, and the measures of the stations technology improving in order to increase the traffic safety were proposed. Originality. Authors had detailed features of the functioning of the railway stations functioning under the dangerous goods transportation management. Practical value. Taking into account the factors and implementation of the proposed measures will improve the safety level of dangerous goods processing at railway stations.
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.