Browsing by Author "Okorokov, Andrii M."

Now showing 1 - 4 of 4
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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.
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    Determining the Vertical Load on a Container with a Floor Made of Sandwich Panels Transported by a Flat Wagon
    (TECHNOLOGY CENTER PC, Kharkiv, 2024) Lovska, Alyona O.; Stanovska, Iraida; Kyryllova, Valeriia; Okorokov, Andrii M.; Vernihora, Roman V.
    ENG: The object of this study is the processes of perception and redistribution of vertical loads in the structure of a container with a floor made of sandwich panels under operational modes. To ensure the strength of the container, as well as the safety of the cargo transported in it, it is proposed to design a floor based on sandwich panels. It is assumed that each of these panels is made of two metal sheets in a layer between which an energy-absorbing material is placed. Given the presence of energy-absorbing material in the structure of the sandwich panel, the vertical dynamic loads acting on the cargo container during its transportation will be reduced. To substantiate the proposed solution, mathematical modeling of the vertical load on the container during its transportation by a flat wagon was carried out. It is found that the accelerations acting on the container of the improved design are 5.7 % lower than those acting on the container of standard design. The calculation of the strength of the container was carried out under operational schemes of its loads. It has been established that the strength of the container is ensured. A special feature of the results is that the reduction of the load on the container is achieved not by strengthening its structure but by introducing flexible connections into it. The field of practical application of the results is railroad transport. The conditions for the practical use of the findings are the use of energy-absorbing material in the structure of sandwich panels that form the floor of the container. The results of the research will contribute to improving the strength of containers under operating conditions, the safety of the cargo transported in them, as well as increasing the efficiency of the functioning of container transportation.
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    Development of a Simulation Model of Grain Delivery in Global Supply Chains
    (National University of Life and Environmental Scienсes of Ukraine, Kyiv, 2024) Khomenko, Yurii; Matsiuk, Viacheslav; Okorokov, Andrii M.; Gorobchenko, Oleksandr
    ENG: The main export shipments of grain to Ukraine are carried out through commercial seaports of the Black Sea, while the complex and multiphase transportation process creates delays and leads to additional costs at the points of connection of various types of transport. The purpose of the study was the process of transporting grain cargo for export through commercial seaports. Ukraine is a developed agricultural country that produces a significant share of the world’s grain volume, most of which is exported. The optimisation simulation model of multimodal grain cargo transportation developed in the study, in contrast to the existing ones, is a multiphase process with many initial parameters, subsystems, and technological elements that adequately reflect all components of the technological process of organising transportation by road, rail, and sea, and helps to optimise these processes. The model consists of several transport and technological subsystems, each of which corresponds to the process of grain transportation by road, rail, or water. The minimum total duration of cargo transportation from the place of origin to the moment of sending grain cargo for export by sea was chosen as the optimal criterion. To establish the minimum required number of replications and the minimum required model time, a series of experiments were performed, where the key and systematic modelling measurement parameter is the total time of grain delivery by land, from the point of origin to the sea trade terminal. As a result of modelling, the optimal number of rolling stock of different types of transport and the transportation time for each phase of the process were determined. Logistics operators of the agro-industrial sector can apply the model to improve grain delivery routes and schemes, evaluate and improve technological parameters, and minimise transportation time and costs.
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    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, Oleksandr
    ENG: 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.