Andrii
@ukrndiv.com.ua
Deputy Director for Research
STATE ENTERPRISE "UKRAINIAN SCIENTIFIC RAILWAY CAR BUILDING RESEARCH INSTITUTE"
EDUCATION
Research Fellow in Electromechanics
RESEARCH, TEACHING, or OTHER INTERESTS
Energy, Energy Engineering and Power Technology, Mechanical Engineering
Scopus Publications
Scopus Publications
Andrii Sulym, Yurii Pavlenko, Dmytro Fedosov-Nikonov, Tetiana Popova, Ján Dižo, and Miroslav Blatnický
MDPI AG
The present study focuses on scientific and experimental research on corrosion damage to the bodies of subway cars. The main purpose of the research is to assess the degree of corrosive wear on the main load-bearing metal structures of the subway cars after the end of their service life in order to determine the possibility of their further operation. Scientific and experimental research was conducted under the conditions of the municipal enterprise “Kyiv Metro” on subway cars of the series (models) Yezh, 81-714/717 and 81-714.5/717.5, which had reached the end of their service life. The main methodological approach of the research consisted of conducting technical diagnostics of the subway cars using standardized non-destructive testing methods. The goal of the research was achieved by solving two main tasks. The first task was to determine mathematical expressions describing the dynamics of changes in the thickness and degree of corrosive wear of the metal structures of the studied subway cars, depending on number of years in operation. The second task was to determine the possibility of extending the service of the subway cars after reaching the end of their service life. The scientific novelty of this study lies in determining the degree of thinning and the development of corrosive wear of the metal structures of the studied subway cars depending on the type of structure and service life. The practical significance of the obtained results lies in the possibility to predict the residual strength resources of the individual elements of the metal structures of the studied cars using the corrosive wear criterion. It was established that the 092GS material of the main metal structures of the subway car bodies is sufficiently resistant to corrosion processes. The results of the research show that the metal structures of the subway cars studied had a margin of safety and, therefore, their service life could be extended.
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.
O Bialobrzheskyi, O Todorov, A Postil, M Bezzub, and A Sulym
Dnipro University of Technology
Purpose. Development of a method for determining the cable line substitution scheme parameters based on the components of its instantaneous power. Methodology. Determination of unknown parameters of the cable line mode using the harmonic balance method. Determination of the U-shaped substitution scheme elements parameters is performed using power harmonics and their balance at the corresponding frequencies. For frequency-dependent elements, it is taken into account that the same power harmonic can be formed by different current and voltage harmonics. Findings. A method for determining the parameters of the cable line substitution scheme using the power components of its elements is proposed, which is distinguished by the fact that the total number of system equations for determining the parameters can be increased due to the use of power. The study of the proposed method for determining the cable line substitution scheme parameters based on the power components, based on the model compiled in the visual programming package, allowed us to establish that the largest parameter determination error is characteristic of active conduction. Originality. With the instantaneous power determination of the cable line substitution scheme reactive elements, it was found that during the calculation of the instantaneous power there is a peculiarity of taking into account the voltage harmonic number depending on the combination of harmonic numbers. Practical value. The proposed method can be developed on the sectioning of the U-shaped line substitution scheme to determine the change in the cable line substitution scheme parameters during its operation without disconnecting the line, unlike existing methods.
O Bialobrzheskyi, I Reva, S Yakimets, and A Sulym
Dnipro University of Technology
Purpose. Substantiation of the methodology for calculating an indicator characterizing the pulsating current power distortion. Methodology. When analyzing the power of direct and alternating sinusoidal currents, the features of the ratio of a root-mean-square norm to its mean value, known as the invariance power factor, are noted. In this case, the root-mean-square power value acts as a normalizing parameter. Using a combination of direct and sinusoidal (pulsating) current, the dependences of the invariance power factor on the ratio of direct and alternating components are obtained. Findings. Taking into account the interaction of the current and voltage components of different frequencies, the corresponding power component is highlighted, called interference power. With its use, by analogy with the invariance power factor, the interference power factor is introduced. The interference power factor behavior for AC non-sinusoidal current circuit and DC pulsed current circuit of rectifier was investigated, as a result of which a difference was established in the interference power factor dependence in these circuits. Originality. The obtained dependences of the interfere power factor on the ratio of DC and AC components for current and voltage prove the versatility of its application for assessing power distortion in both DC and AC circuits, as proved by the example of a circuit with a single-phase controlled rectifier. Practical value. The results obtained can be used to assess the electrical power distortion level in electric complexes and systems of various kinds of current and kind of energy, including when it is taken into account. This is a prerequisite for the measures development to improve the electricity quality.
Andrii Sulym and Pavlo Khozia
IEEE
O Bialobrzheskyi, A Gladyr, S Yakimets, and A Sulym
Dnipro University of Technology
Purpose. Justification of the need for electrical energy quality technical accounting based on the results of monitoring a 10 kV traction substation transformer mode. Methodology. Measurements of the current and voltage at secondary busbars of a 10 kV traction substation and monitoring of the electrical energy parameters in the observation interval were carried out. Using the Fourier analysis methods, a current and voltage harmonics level was analyzed. For the current and voltage fundamental harmonic, the positive, negative and zero sequences components are analyzed using the Fortescue transformation. Based on the secondary voltage side current discrete spectrum, the calculation of power loss growth in cable line and transformer windings was carried out. Findings. As a result of measuring the electrical mode parameters on the transformer secondary voltage busbars, a significant distortion of current and voltage, as well as significant fluctuations in active and reactive power, were established. During the observation interval, significant changes in the power factor are noted. Based on the calculation of additional losses from current higher harmonics in the cable line, it has been established that the current load of the line can be reduced by 10% while eliminating the current higher harmonics. A similar calculation of loss growth carried out for the traction transformer showed that in the analyzed case its load should not exceed 87.8% of the nominal one. Originality. A significant level of harmonic current distortion on secondary voltage busbars of the traction transformer leads to its underutilization, whereas the voltage distortion level, as an electrical energy quality indicator in accordance with current standards, remains within the permissible range. This requires a revision of electrical energy quality indicators, from the standpoint of power, which is due to both current and voltage. Practical value. The indicators obtained as a result of calculations can be used to correct the load of traction substation transformers. The introduction of the obtained indicators into the set of parameters for electrical energy technical metering is a prerequisite for the development of measures to improve the electrical energy quality.
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 O Sulym
IOP Publishing
Abstract In the article a comparative analysis of existing methodologies and approaches on the parameters determination of the capacitive energy storages for a metro train with energy recovery systems was performed, disadvantages of each of them were determined. A complex approach for estimation of the on-board capacitive energy storage parameters was proposed; the point of approach consists in determination of the rational power and energy capacity for two parameters of the storage system at once – mass and payback period. The complex approach is based on theoretical researches, which require simulation of the metro train equipped with recuperation system operation by mean of developed software. The objective function was represented and boundary values for the power and energy capacity during determination of the rational parameters of the on-board capacitive energy storage using a complex approach were specified. The recuperation system with rational parameters of the on-board capacitive energy storage for specified service conditions in Public Utility Company “Kyiv Metropolitan” and chosen research metro train was specified. Amount of energy stored due to the installation of the energy storage system with rational parameters was estimated.
D V Fedosov-Nikonov, A O Sulym, V V Ilchyshyn, O M Safronov, and M B Kelrikh
IOP Publishing
Abstract Transportation of goods in large containers with loading length of 80 feet is one of the promising directions of railway transport development. However, despite considerable experience in construction of long-wheelbase flat cars, occasionally problems with the strength of load-bearing elements arise at the calculation, design and manufacture of such products. The article presents the technical characteristics of a long wheelbase flat car, as well as the results of experimental studies of fatigue tests of its load-bearing elements. The optimization of the design of the long wheelbase flat car was achieved both by increasing the sizes and shapes, and by using materials of increased strength. An analysis of the study’s results of an improved design showed the compliance of the values of the safety factor of fatigue strength and the service life of the flat car with regulatory and technical documentation. The conducted studies allow us to make recommendations regarding the design, rebuilding and testing of long wheelbase flat cars. The primary results of fatigue tests of the main load-bearing structural elements within the scope of experimental studies turned out to be mostly below acceptable values. This article contains facts confirming it. The results of experimental studies to determine the fatigue strength proved that the design elements require improvement and strengthening.
Oleh Todorov, Olexii Bialobrzheskyi, and Sulym Andrii
IEEE
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