Browsing by Author "Zhuravel, Iryna L."

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Determining Loading Patterns in the Bearing Structure of a Railroad Flatcar with a Floor Made from Sandwich Panels
(PC TECHNOLOGY CENTER, 2023) Lovska, Alyona O.; Nerubatskyi, Volodymyr; Okorokov, Andrii M.; Vernyhora, Roman V.; Zhuravel, Iryna L.
ENG: The object of research is the processes of emergence, perception, and redistribution of loads in the supporting structure of a flatcar with a floor made of sandwich panels. To reduce the impact of dynamic loads on the supporting structure of a flatcar, as well as the safety of goods transported in it, it is proposed to manufacture floors from sandwich panels. Within the framework of the study, mathematical modeling of the dynamic load on a flatcar when it runs in a loaded state was carried out. It was found that, taking into account the proposed solution, the accelerations acting on the supporting structure of a flatcar are reduced by 8.4 % compared to the typical one. At the same time, accelerations acting on cargo placed on a flatbed car are reduced by 11.7 %. The results of calculating the strength of sandwich panels, when arranged on a flatcar, proved the feasibility of the proposed improvement. The main indicators of dynamics of the improved flatcar structure operated in an empty state were determined. It was established that the flatcar movement is assessed as "good". A feature of the results reported here is that the improved supporting structure of a flatcar contributes not only to reducing its dynamic load but also to improving the safety of transported cargoes. The scope of practical application of the results is the engineering industry, in particular, railroad transport. The condition for the practical application of the research results is the use of energy-absorbing material in the structure of sandwich panels. The study could contribute to devising recommendations regarding the design of modern structures of railroad vehicles and increasing the efficiency of the functioning of the transportation industry.
Revealing the Causes of Delays at Transit Points along an Intermodal Grain Supply Chain
(TECHNOLOGY CENTER PC, Kharkiv, 2025) Khomenko, Yurii L.; Okorokov, Andrii M.; Matsiuk, Viacheslav I.; Zhuravel, Iryna L.; Pavlenko, Olena I.
ENG: This study’s object is the transport and technological system of grain supply along international routes. The issue considered is the emergence of excess cargo weight at the junctions of various types of transport. The study was conducted on the basis of a constructed simulation model built according to the agent and discrete-event principles. It covers both the maximum transportation volumes in one of the Ukraine’s oblasts in 2021 (880 thousand tons) and the forecasted indicators (1–1.5 million tons per year). The application of the model has made it possible to determine the optimal parameters for the fleet of vehicles in a supply chain, guided by the system criterion – minimization of the average delivery time of one ton of grain. It was established that for transporting 1 million tons of grain per year, the optimal composition of the transport fleet should include 92 trucks and four railroad routes. Patterns in the formation of excess cargo weight depending on the estimated composition of vehicles were also determined. With a planned transportation intensity of 1 million tons per year, reducing the number of trucks by 12 units could lead to the accumulation of 237 thousand tons of cargo mass at transit points. Reducing the number of railroad routes by one unit would lead to the accumulation of 544 thousand tons of cargo mass, which corresponds to USD 106 million. The proposed model makes it possible to assess the consequences of delays in delivery, as well as the formation of excess cargo mass at transit logistics terminals and grain elevators.
Scientific Rationale for the Use of Perforation Beams in the Bearing Structure of a Modernized Railroad Flat Wagon for Container Transportation
(TECHNOLOGY CENTER PC, Kharkiv, 2025) Panchenko, Sergii V.; Lovska, Alyona O.; Zhuravel, Iryna L.; Naumenko, Yevheniia O.; Zharovа, Oksana V.
ENG: This study investigates processes related to the occurrence, acceptance, and redistribution of loads in the supporting structure of a railroad flat wagon. The task addressed is to improve the technical and economic indicators of the modernized flat wagon for container transportation by reducing its tare. To this end, the stress distribution fields in the modernized railroad flat wagon structure were determined. It was established that the main longitudinal beams of the frame have a strength reserve, which is due to the underutilization of railroad flat wagon bearing capacity. This leads to an excess sprung mass of its supporting structure. Therefore, it is proposed to introduce perforation in the walls of the main longitudinal beams of a railroad flat wagon. To substantiate this solution, the strength of the bearing structure of a railroad flat wagon was calculated. It was established that the maximum stresses in the bearing structure are 13.6% lower than the permissible ones. The design service life of a railroad flat wagon is at least 32 years. The biaxiality calculation of the bearing structure showed that its greatest values are reached in the middle parts of girdle beams. A special feature of the proposed solution is that it makes it possible to improve the technical and economic indicators of the modernized railroad flat wagon with minor capital investments. The scope of practical application of the results is railroad transport. A condition for practical use of the results is symmetrical loading of the bearing structure of a railroad flat wagon with cargo. The results of the research could contribute to improving the efficiency of container cargo transportation along international routes. In addition, the results might prove useful for designing and fabricating new structures of railroad flat wagons, as well as for modernizing existing ones.