Pavlo Khozia
Verified @gmail.com
Scopus Publications
Scopus Publications
Andrey Sulym, Pavlo Khozia, A. Fomin, and Oleksandr Bahrov
Technical University of Moldova
The object of this paper is to develop and synthesize a system for managing energy ex-change processes between the overhead line, electric drive of metro vehicles, braking resistor and ca-pacitive energy storage devices. To achieve this goal, the following tasks must be completed. The first task is to create a mathematical model and to define the requirements to control system for energy ex-change processes currently being developed for metro rolling stock with capacitive energy storage de-vices. The second task is to develop a block diagram of a control unit for energy exchange processes. The third task is to synthesize a control system for energy exchange processes on metro rolling stock with capacitive energy storage devices and an algorithm for its operation. The fourth task is to check the functioning of the synthesized control system and its operating algorithm. The most significant result of the work is the improvement of the technical characteristics of the rolling stock, higher pas-senger safety on metro transit, minimization of electricity consumption from the overhead line by in-creasing the use of regenerative braking energy generated by the electric drive of the train, voltage compensation in the overhead line, train operation capability in emergencies due to the implementa-tion of the developed control system. The significance of the results obtained is a synthesis of an adap-tive control system that makes it possible to monitor and manage the energy exchange processes on metro rolling stock with capacitive energy storage devices, considering storage devices charging rate, the train-driving mode and the nature of the energy processes. Keywords: capacitive energy storage, metro, rolling stock, energy exchange processes, control system, braking resistor, electric drive.
A Sulym, O Bialobrzheskyi, P Khozia, and A Lomonos
Dnipro University of Technology
Purpose. To analyze the energy saving reserves under the conditions of implementation and integration of the system in order to find rational driving modes in the general system of managing underground electrified transport. Methodology. The work presents the method for processing data arrays obtained experimentally with the help of a measuring system and theoretically with the use of the “Rational Trajectory” software. Findings. Experimental studies were carried out using a testing system created on the basis of a refurbished train with energy recovery system. Theoretical studies were carried out using the “Rational Trajectory” software, which is based on the principle of solving a multi-criteria problem by the method of the main criterion. The minimum amount of electricity consumption from the overhead contact line was chosen as the main criterion. The software was developed in the LabVIEW graphical programming environment in order to determine the rational modes of driving rolling stock and energy indicators in a given area of its operation. The amount of electricity consumed for traction and the amount of electricity generated by the train during regenerative braking were determined based on the results of experimental and theoretical studies, respectively, under typical and rational modes of driving the train for given identical operating conditions. Originality. Further research on the analysis of energy saving reserves on the rolling stock of underground electrified transport was achieved due to the introduction of a system for finding a rational driving mode. Practical value. It has been established that the implementation and incorporation of the “Rational Trajectory” software into the train control system will save up to 14.7 % of the amount of electricity consumed for traction, compared to typical modes operation on a given track section.
Andrii Sulym and Pavlo Khozia
IEEE
Andrii Sulym, Pavlo Khozia, Eduard Tretiak, Václav Píštěk, Oleksij Fomin, and Pavel Kučera
MDPI AG
This article deals with the method of computer-aided studies of the results of tank container impact tests to confirm the ability of portable tanks and multi-element gas containers to withstand the impact in the longitudinal direction on a specially equipped test rig or using a railway flat car by impacting a flat car with a striking car, in compliance with the requirements of the UN Navigation Rules and Regulations. It is shown that the main assessed characteristic of the UN requirements is the spectrum of the shock response (accelerations) for the interval natural frequencies of the shock pulse. The calculation of the points of the shock response spectrum curve based on the test results is reproduced in four stages. A test configuration of the impact testing of the railway flat car with a tank container is presented, and the impact is performed in such a way that, under a single impact, the shock spectrum curve obtained during the tests for both fittings subjected to impact repeats or exceeds the minimum shock spectrum curve for all frequencies in the range of 2 Hz to 100 Hz. Formulas for determining the relative displacements and accelerations for the interval natural frequencies of the shock wave are given. The research results are presented in graphical form, indicating that the experimental values of the shock response spectrum exceed the minimum permissible values; the equation of the experimental curve of the shock response spectrum in the frequency range 0–100 Hz is described by power-law dependence. The coefficients of the equation were determined by the statistical method of maximum likelihood with the determination factor being 0.897, which is a satisfactory value; a comparative analysis showed that the experimental curve of the impact response spectrum in the frequency range 0–100 Hz exceeds the normalized curve, which confirms compliance with regulatory requirements. A new test configuration is proposed using a tank car with a bulk liquid, the processes in which upon impact differ significantly from other freight wagons under longitudinal impact loads of the tank container. The hydraulic impact resulting from the impact on the tank container and the platform creates an overturning moment that causes the rear fittings to be unloaded.
A Sulym, A Lomonos, O Bialobrzheskyi, O Safronov, and P Khozia
Dnipro University of Technology
Andriy Sulym, Oleksij Fomin, Pavlo Khozia, Oleksii Palant, and Vyacheslav Stamatin
Private Company Technology Center
A.O. Sulym, O.V. Fomin, P.O. Khozia, and A.G. Mastepan
Dnipro University of Technology
Oleksij Fomin, Andrii Sulym, Ivan Kulbovskyi, Pavlo Khozia, and Vadym Ishchenko
Private Company Technology Center