Browsing by Author "Krasnov, Roman V."
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Item Experimental Investigation of Actual Stuation of using and Accounting of Recovered Energy of Regenerative Braking Mode at the DC Traction System(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Bondar, Oleh I.; Ustymenko, Dmytro V.; Kurylenko, Olena Ya.; Kedria, Mykhailo M.; Karzova, Oksana O.; Krasnov, Roman V.; Baliichuk, Oleksii Yu.ENG: Abstract. This paper deals with the problems of enhancement of registration and distribution of electric energy which can be obtained from DC electric locomotives by the regenerative braking. According to theoretical researches, it is possible to return approximately 8 - 12% of electric energy which is consumed for electric traction by using of a regenerative braking mode. However in recent years for electric traction networks of JSC “Ukrainian Railways”, this index doesn't exceed 2.6%. So we consider that the regenerative braking is one of the most prospective ways for energy saving in electric railway transport. Results of the experimental researches which were executed on DC traction substations and VL11M6 electric locomotives are described in this paper. Instantaneous values of voltage and current in different modes have been obtained. The electric energy balance for experimental zone has been performed. Also the ways of distribution and consumption of energy of regenerative braking mode have been analyzed. On this basis of the executed investigations, recommendations about providing of supercapacitor energy storage system for Ukrainian railways are proposed.Item Feasibility Study for Extending the Rolling Stock Component Life(Academic Society of Michal Baludansky, Kosice, 2019) Artemchuk, Viktor V.; Krasnov, Roman V.; Karasev, Oleksandr P.ENG: The article deals with the problem of determining the rational extension of the railway rolling stock component life. It is noted that a key part of the repair development, including on railway transport, is an extended service life of the rolling stock components. Given that a significant proportion of the repair cost is spent for the replacement or repair of worn parts, there is a conclusion that component life must be extended to reduce further repair costs. However, unjustified increase in the service life of all components is not feasible, since the life of individual components may be greater than the life of the entire product. Obviously, it is not expedient to extend the life for all the details, but only that of the most responsible and (or) most worn out, which greatly affect the service life of the assembly or unit as a whole. That is, there is a need to match the life of the entire assembly and individual components. Therefore, in the presented work, theoretical research was carried out to solve the complex task of determining the rational life of rolling stock components taking into account the resource of assemblies and the rolling stock vehicle as a whole. When searching for rational parameters, the durability of components and the factors affecting their life were investigated and the possibilities of various restorative and strengthening technologies were evaluated. The developed approach is flexible and allows for consideration of technological limitations of production, financial constraints and the introduction of life limits for a specific component. Also the article covers the shortcomings of the presented methodology. At the same time it is should be noted that with the development of the diagnostic system, obtaining the necessary data will be less labour intensive and will require less time, and with the development of the necessary software, the accumulation and processing of statistics can be fully automated. In this paper, it is assumed that the presented methodology will make it more attractive to use renewable technologies, save considerable resources and find the necessary restorative or strengthening technology that will bring the life of different components closer to the life of the assembly or mechanism as a whole.Item Improvement of Energy Indicators of Conventional Electric Driving Asynchronous Motors of Non-Standard Technological Equipment at the Enterprises for Repair of Railway Rolling Stock Through the use of Energy-Saving Motors(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Bondar, Oleh I.; Baliichuk, Oleksii Yu.; Karzova, Oksana O.; Krasnov, Roman V.; Marenych, Oksana L.; Ustimenko, DmytroENG: Abstract. The purpose of this work is to study the utilization efficiency of electric driving energy-saving motors of non-standard technological equipment meant for repair of railway rolling stock, in terms of improvement of energy performance, i.e. improvement of efficiency factors and power factors, and decrease of power losses as compared with the most commonly used “conventional” asynchronous motors. There are two options for improvement of the energy performance of electric drives of non-standard technological equipment: replacement of a conventional motor with an energy-saving one similar in terms of nominal voltage, rotational speed, power, etc.; changeover of stator winding from “delta” to “star”. A special technique has been proposed to determine the effectiveness of this changeover in terms of improvement of energy indicators. Comparison of the real values of the energy indicators of conventional motors and energy-saving motors in the case under consideration is required to perform the technical and economic calculations when solving the problem of the expediency of replacement of conventional asynchronous motors with energy-saving motors in the abovementioned equipment.