Browsing by Author "Korobiova, Ruslana H."
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Item Improvement of the Method of Time Rationing for Assembling Car Groups on One Track(Dnipro University of Technology, Dnipro, Ukraine, 2024) Kozachenko, Dmytro M.; Gera, Bogdan V.; Taran, Ihor; Korobiova, Ruslana H.; Malashkin, Vyacheslav V.; Hermaniuk, Yuliia M.ENG: Purpose. To improve the method for standardizing the duration of the shunting operation of assembling cars on one track. This can be achieved as a result of solving the following research problems: development of a method for searching the optimal order of assembling cars on one track; distribution parameters estimation of the random value of the duration of shunting operation of assembling cars on one track based on calculation experiments. Methodology. During the research, the methods of theory of railway operation, dynamic programming and mathematical statistics were used. Findings. Research on the assembling process of car group to one track established the distribution parameters of the random variable of time spent for shunting. In the course of the research, the problem of choosing the optimal order of shunting operations during car assembling was formalized and solved as a problem of dynamic programming. The time spent for shunting work was chosen as the optimality criterion. The paper considers the possibility of approximating the data of calculation experiments by analytical dependencies. It was found out that the use of linear polynomials with interaction allows obtaining dependencies describing time standards with a relative accuracy of ±5 %. Originality. The method is improved for developing the time standards for shunting work, which, unlike the existing one, is based on the performance of a series of calculation experiments, each of which solves the optimization problem of finding such an order of assembling cars that ensures minimum time consumption for shunting. Practical value. The methods developed in the work and the dependencies obtained allow improving the quality of decisions made when developing technology and designing railway stations and sidings of industrial enterprises.Item Introduction of Bimodal Technologies for Transportation of Grain Cargoes(KTU, Lithuania, 2023) Malashkin, Vyacheslav V.; Berezovyi, Mykola I.; Korobiova, Ruslana H.ENG: The purpose of the study is to evaluate the effectiveness of bimodal grain cargo transportation in containers in comparison with other methods of their delivery to seaports. The studying of the grain transportation process is carried out using the methods of mathematical statistics, computer simulation and the theory of organization of railway operational work. Estimation of variants of transportation organization was carried out using the methods of economic-mathematical modeling. The originality of the work is that it received the dependence of the cost of grain cargo delivery on the distance, taking into account the design features of rolling stock and the specific functioning of railway stations for its processing. The practical significance of the work lies in the fact that the implementation of its results allows reducing the logistics costs of grain cargo transportation.Item Optimization of Track Distribution of Industrial Railway Stations between Car Designations(Dnipro University of Technology, Dnipro, Ukraine, 2023) Nurzhaubayev, Meiram; Grevtsov, Serhii; Korobiova, Ruslana H.; Manafov, Elshan; Abdukarimov, Sadratdin; Arpabekov, MuratbekENG: Purpose. To improve the method for distributing the tracks of industrial railway stations for the accumulation of car groups between separate assignments. The optimization problem is to find such a distribution of classification work between the industrial marshalling yard and freight stations, as well as such a distribution of marshalling yard tracks between individual destinations, which ensures the minimum time expenditures on shunting work. Methodology. The studies were carried out using the methods of the theory of railway operation, simulation modeling and dynamic programming. Findings. The optimization problem of distribution of sorting work between the marshalling yard and freight stations of an industrial enterprise, as well as searching for such a distribution of marshalling yard tracks between individual destinations, which ensures the minimum time expenditures for shunting work, has been solved. Originality. The paper proposes a method for formalizing and solving the problem of distributing the tracks of industrial railway stations for the accumulation of car groups between individual destinations as a dynamic programming problem. Unlike the existing methods, where the number of tracks is considered as a constraint, in the proposed method, the number of tracks is an objective function argument of minimizing the duration of shunting operations, which improves the quality of the solutions obtained. Practical value. The method proposed in the paper, due to the rational distribution of the existing track arrangement of railway stations, makes it possible to reduce the time expenditures on the making- and breaking-up the trains and shunting transfers and, due to this, increase the carrying capacity of the stations, as well as reduce the cost of production of enterprises.