Browsing by Author "Kurhan, Mykola"

Now showing 1 - 29 of 29

The Advisability of Using Dual Gauge for Expansion of the International Traffic
(Printing House “Technologija”, Kaunas, Lithuania, 2020) Kurhan, Mykola ; Kurhan, Dmytro ; Husak, Marina ; Hmelevska, Nelya
ENG: The possibilities of railway transport for the organization of transportation between the countries are not used to the full extent, since there are a number of technical reasons. The usage of dual gauge (1435/1520 mm) is one of the solutions. As an example of using dual gauge is the international project "Rail Baltica", Lviv railway and etc.
Analysis of Feasibility for Implementing European Standard Railway Tracks in Ukraine
(Kaunas University of Technology, Kaunas, Lithuania, 2023) Kurhan, Mykola; Kurhan, Dmytro; Hmelevska, Nelya
ENG: The contemporary challenge at hand pertains to the development of theoretical, methodological frameworks, and practical guidelines for establishing railway mainlines in Ukraine aligned with European standards. The objective of this research involves scrutinizing diverse scenarios and, based on this analysis, evaluating the prospects of constructing European standard railway tracks within Ukraine. The introduction of a 1435 mm gauge railway network on a new route within Ukraine necessitates substantial investments in transport infrastructure construction and procurement of rolling stock. An unbiased assessment and definitive determination of prospective directions demand an examination of key criteria characterizing rail-oriented agglomeration tendencies and the volume of transit transportation for both passengers and freight. Additionally, the analysis takes into account the techno-economic potential of these directions.
Analysis of Stress-Strain State Changes in Railway Tracks During Transition to European Gauge
(IOP Publishing, 2024) Fischer, Szabolcs; Kurhan, Dmytro; Kurhan, Mykola; Hmelevska, Nelya
ENG: The geographical location of Ukraine facilitates its integration into the transportation network connecting European countries. Various options exist for transitioning from the gauge of 1 520 mm to the European standard gauge of 1 435 mm. This paper aims to analyze the changes in the stress-strain state of railway track elements during the reconstruction of existing sections from the 1 520 mm gauge to the 1 435 mm European gauge or to a dual gauge of 1 435/1 520 mm. To perform these calculations, a spatial model of dynamic deformations in the railway track is employed, based on the principles of elasticity theory. The results of the analysis indicate that the post-reconstruction railway track elements do not exceed permissible stress levels. However, the implementation of a combined railway track complicates the stress state of the ballast layer, leading to asymmetric stresses along the length of the sleepers, which vary depending on the track on which trains operate. There will also be a redistribution of stresses acting on the ground structure, which remains in place after years of operation. The research results identify changes in the stress-strain state of the railway track and can be used to justify measures for the appropriate reinforcement of the ballast layer and the ground structure.
The Analytic Hierarchy Process as a Cognitive Tool for Evaluating Switch Components
(CogSust Nonprofit Ltd., Budapest, Hungary, 2025) Kurhan, Mykola; Kurhan, Dmytro; Baidak, Serhii; Khmelevskyi, Vladyslav
ENG: The purpose of this study is to improve the approach to the comprehensive evaluation of switch elements by applying the Analytic Hierarchy Process (AHP). This method makes it possible to determine their priority according to safety and efficiency criteria, as well as to justify optimal strategies for modernization and reconstruction under conditions of increasing train speeds. The scientific approach involves the use of AHP with consideration of the specific operational features of switches on high-speed railways. In particular, the study accounts for higher safety and speed requirements, decreasing maintenance costs, and the reduced service life of structural components. A hierarchy of criteria was developed, along with pairwise comparisons, the calculation of weighting coefficients, and an integrated assessment of alternatives. The application of AHP enabled the determination of the priority of each switch type based on the criteria of traffic safety, speed, operational costs, and service life. According to the analysis, the priorities of the main switch elements were established as follows: frog – 0.395; closure curve – 0.234; switch blade – 0.190; switch curve – 0.181. These results confirm that the frog is the most critical element in terms of its overall impact on safety, speed, and maintenance costs, which is primarily due to its structural complexity and high wear rate (especially under dynamic loads). The findings provide a basis for informed decision-making regarding the prioritization of repair or replacement of individual structural elements, considering the operating conditions of high-speed lines.
Assessment of Combined High-Speed Passenger and Freight Train Movement to Mitigate Environmental Impact
(IOP Publishing Ltd, 2025) Kurhan, Mykola; Fischer, Szabolcs; Kurhan, Dmytro; Hmelevska, Nelya
ENG: The purpose of the study is to investigate the primary reasons for the feasibility of the combined movement of high-speed passenger and freight trains. The research includes the analysis and theoretical synthesis of materials related to the combined movement of high-speed passenger and freight trains in European Union countries. The combination of different train categories on high-speed rail lines is not only possible but also, under certain conditions, advisable. The main reasons for arranging sections of combined passenger and freight movement include overcoming contour or height obstacles and justifying investments in the construction of high-speed railways where the demand for passenger transportation is insufficient and profitability is ensured through additional income from cargo transportation. The combined movement of high-speed passenger and freight trains can reduce environmental impact by ensuring the efficient use of railway infrastructure and decreasing transport emissions. The authors have proposed a comprehensive approach to assessing the effectiveness of implementing the movement of high-speed passenger and accelerated freight trains, considering the net present value and ensuring the capacity of the double-track railway line during concurrent train movements. The research results enable enhancing the stability of railway transportation on high-speed railways.
Determination of the Type and the Length for the Transition Curves on the Directions of High-Speed Train Operation
(Széchenyi István University, Győr, Hungary, 2022) Kurhan, Mykola ; Kurhan, Dmytro ; Husak, Marina ; Hmelevska, Nelya
ENG: In many countries around the world, a cubic parabola is used as transition curves in a simplified form. Today, the properties of many mathematical curves are well studied, which can be used as transition curves. The object of research is the process of restructuring transition curves when organizing high-speed trains operation. The use of modern means of mathematical modelling allows to add a number of dynamic characteristics for evaluation parameters of motion in the curved sections of the tracks. Thus, with an increase in speed for transition curves, both the values of unbalanced acceleration and its change in time, and also the velocity attenuation of oscillations of rolling stock when moving from a transition curve to a circular curve or to a direct section. On the basis of the conducted research, it has been found that when increasing the speed of the vehicle movement in the range from 120 to 200 km/h, the length of the stabilization section increases at the output of the curvature by an average of 20 m for every 40 km/h. The analysis showed that with correctly set parameters of transition curves, which correspond to the maximum speed of movement and radius of a circular curve, the strength and reliability of the bearing elements in the structure of the permanent way and the travel comfort are fully ensured.
Determining the Deformation Characteristics of Railway Ballast by Mathematical Modeling of Elastic Wave Propagation
(MDPI, 2023) Kurhan, Dmytro ; Kurhan, Mykola ; Horváth, Balázs; Fischer, Szabolcs
ENG: The article solves the problem of theoretically determining the deformable characteristics of railway ballast, considering its condition through mathematical modeling. Different tasks require mathematical models with different levels of detail of certain elements. After a certain limit, excessive detailing only worsens the quality of the model. Therefore, for many problems of the interaction between the track and the rolling stock, it is sufficient to describe the ballast as a homogeneous isotropic layer with a vertical elastic deformation. The elastic deformation of the ballast is formed by the deviation of individual elements; the ballast may have pollutants, the ballast may have places with different levels of compaction, etc. To be able to determine the general characteristics of the layer, a dynamic model of the stress–strain state of the system based on the dynamic problem of the theory of elasticity is applied. The reaction of the ballast to the dynamic load is modeled through the passage of elastic deformation waves. The given results can be applied in the models of the railway track in the other direction as initial data regarding the ballast layer.
Development of High-Speed Railway Network in Europe: A Case Study of Ukraine
(Budapest University of Technology and Economics, Budapest, Hungary, 2024) Kurhan, Mykola; Fischer, Szabolcs; Tiutkin, Oleksii L.; Kurhan, Dmytro; Hmelevska, Nelya
ENG: The current task today is the development of theoretical and methodological approaches, as well as practical recommendations for determining the technical feasibility of creating high-speed railway (HSR) lines in the European context. The development of railways in individual countries, followed by the creation of a pan-European high-speed railway network, has raised questions about the compatibility of the technical systems of individual national HSRs. This paper addresses these issues using the example of Ukraine. The research is based on an analysis of scientific developments related to the design of HSR lines and the synthesis of European experience in identifying priority route directions in Ukraine. For comparing various scenarios for the development of railway connections, the authors have developed a forecasting and efficiency assessment model based on the Net Present Value (NPV) indicator. It has been demonstrated that considering the population attracted to HSR and the volume of transit passenger transportation alone is insufficient to achieve the normative investment payback. This situation can only be rectified by implementing mixed traffic involving high-speed passenger trains and accelerated freight trains. However, mixed traffic of passenger and freight trains on high-speed rail lines may face numerous issues and constraints that require careful planning and coordination.
Development of the High-Speed Running of Trains in Ukraine for Integration with the International Railway Network
(Óbuda University, Budapest, Hungary, 2022) Kurhan, Dmytro ; Kurhan, Mykola ; Hmelevska, Nelya
ENG: Most European countries successfully solve the problem of national passenger transportation due to a significant increase in speed. Such measures are carried out both on existing railways through their modernization, and on specially built lines. Mass passenger transportation along the HSN has confirmed their extremely high reliability, safety, economic efficiency, ecological cleanness, and attractiveness for passengers. The creation of international networks based on the potentials of individual countries leads to the need for establishing the following operational and technical parameters of domestic high-speed railway lines, which would have operational compatibility with the Trans-European HSN. The interconnection between the volume of passenger traffic with the specified factors allows to predict promising passenger flow and evaluate the effectiveness in the organization of high-speed running in a particular direction. The economic integration of countries in the European Union allows increasing passenger flows on international travel. This circumstance leads to the problem solution in connecting national high-speed highways into a single European network.
The Effectiveness Evaluation of International Railway Transportation in the Direction of “Ukraine – European Union”
(Kaunas University of Technology, 2018) Kurhan, Mykola ; Kurhan, Dmytro
ENG: The paper presents results of a study concerning the development of railway transit traffic in international transport. It identifies problematic issues at the border crossing in the direction of "Ukraine–European Union" and ways to eliminate them. During the research methods of analysis and synthesis were used to study statistical materials and the main provisions of scientific papers about the state and prospects for the development of European and domestic systems of inter-national railway transportation. In order to predict the volume of international transportation, the experience of creating, operating and optimizing systems including international transport corridors, rolling stock and border station technology at the rail gauge joint of different standards (1435/1520 mm) are taken into account.
Enhancing Railway Section Capacity, during Expansion of the European Railway Network
(Óbuda University. Budapest, Hungary, 2025) Kurhan, Mykola; Kurhan, Dmytro; Hmelevska, Nelya
ENG: The Trans-European Transport Network was established by the European Union to connect Europe from west to east and north to south through a transportation network. One of the challenges in organizing barrier-free railway connections across European countries is the varying track gauge. Some European countries continue to use gauges different from 1435 mm. The aim of this study is to provide a scientific justification for reconstruction options, for a railway section, taking into account technical, economic, and other aspects, as well as to develop recommendations for a successful transition to European track standards. In this work, the authors examined the Kovel-Sarny-Korosten section, which is part of the Warsaw-Kyiv route. This route is one of several options for upgrading to European gauge to create a continuous railway network between the European Union and Ukraine. The research methodology and scientific approaches may vary depending on the characteristics of the sections being considered. In this study, the authors implemented the following sequence of steps: determined the maximum freight capacity for each segment, assessed the existing capacity, analysed reconstruction measures, and evaluated the effectiveness of reconstruction options. The modernization of the railway corridor under consideration has significant potential to improve transport connectivity between Ukraine and Poland, as well as to stimulate economic development in the regions through which this route passes.
Forecasting of Passenger Traffic upon Implementation of High-Speed Running
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2017) Kurhan, Mykola ; Kurhan, Dmytro
ENG: Purpose. Forecasting of passenger traffic flows in the future is an essential and integral part of the complex process of designing of high-speed network (HSN). HSN direction and its parameters are determined by the volume of passenger traffic, the estimated value of which depends on the economic performance of the country, as well as the material status of citizens living in HSN concentration area, transport mobility of population, development of competing modes of transport and so on. The purpose of this work is to analyse the existing methods of passenger traffic forecasting, to evaluate errors of the existing models concerning determination of traffic volumes and to specify the scientific approach to the development of high-speed rail transport in Ukraine. Methodology. The existing forecasting methods are reduced to the following ones: Delphi approach, extrapolation method, factor and correlation analysis, simulation method. The method described in this paper is based on scientific approaches such as analysis – a comprehensive and detailed study of various aspects of the known forecasting methods, comparing of existing methods for establishing differences and similarities, as well as deduction – use of general knowledge to get the new particular one. Thus, the unified indicators determined for the country as a whole, such as gross domestic product, national income, total population and others cannot be used to forecast the traffic flow on specific areas of HSN construction. Therefore, it is necessary to move from the overall forecast to traffic volume forecast on particular direction. Findings. The conclusions are derived from the analysis of different approaches and methods of passenger flow forecasting. It is proposed to create typical techniques of traffic flow forecasting using modern mathematical methods that would allow avoiding unreasonable decisions and shortening project development time. The resulting recommendations will help in the efficiency of design decisions, as well as will determine the quality of the project in whole and the feasibility of its implementation in particular. Originality. The scientific approaches to forecasting the passenger traffic volume in HSN agglomeration area were further developed. The HSN feasibility study criteria system was updated; this system takes into account passenger transit flows through Ukraine, the population of the cities covered by the high-speed network, mobility of population and other factors. Practical value. The data obtained by authors can be used to justify the concept of highspeed rail transport development in Ukraine, to create a high-speed network and to phase HSN construction.
Impact of The Variable Stiffness Section on The Conditions of Track and Rolling Stock Interaction
(IOP Publishing Ltd., 2020) Kurhan, Dmytro ; Kurhan, Mykola ; Husak, Marina
ENG: Railway track stiffness is one of the main parameters that determine the track and rolling stock interaction. The inelasticity of the rail base may occur for two reasons: either as a consequence of the deteriorated condition of a track or due to the structural features of a section. As a rule, areas before bridges or tunnels are treated. Today, there are several options for relevant design solutions. The main purpose of this work is to determine the characteristics of a "railway track" object with which it can be represented in the rolling stock models in the simplest way possible but adequate for sections of transient stiffness. The railway track is introduced into the rolling stock model as a sequence of elements with which the wheels of the rolling stock interact. It is assumed that a single element in its characteristics must be equivalent to the track response when passing the wheel from one inter-sleeper section to the next one, that is, to reproduce a sequence that is cyclically repeated. Such a track element will be characterized by reduced mass, stiffness and dissipation factor.
Improvement of The Railway Track Efficiency by Minimizing the Rail Wear in Curves
(IOP Publishing Ltd., 2020) Kurhan, Mykola ; Kurhan, Dmytro ; Novik, R.; Baydak, Sergii; Hmelevska, Nelya
ENG: The article presents the analysis results for the parameters measurements of the rail track and the ratio between values of the vertical and side wears of rails in curves of different radii under different operating conditions. It is shown that the installed elevations of the outer rail do not meet the contemporary requirements in increasing the efficiency of the track while minimizing the rail wear. At the second stage of the research, various sections were examined by type of traction, technical equipment, plan parameters and the longitudinal profile. As an example, the results of calculations are presented in Lviv-Rava-Ruska section as a promising project that can ensure the integration of railway transport in Lviv-Warsaw direction. Analysis of the results obtained with the help of the software package – MoveRW and RWPlan programmes, allowed to determine such a combination of elevations of the outer rail in curves, so that trains of different categories realize the lowest values of cross unbalanced accelerations, which provide the minimum wear of rails in compliance with regulatory requirements for unbalanced acceleration, changing this acceleration in time, elevating speed of a wheel on the removal of the outer rail.
Increasing the Efficiency of the Railway Operation in the Specialization of Directions for Freight and Passenger Transportation
(Obuda University, Hungary, 2022) Kurhan, Mykola ; Kurhan, Dmytro ; Husak, Marina ; Hmelevska, Nelya
ENG: It is shown that in the mixed traffic of trains compared to the directions specialized for transportation of freight and passengers, the traffic capacity is sharply reduced, and costs on repairs and maintenance of track infrastructure increase by 1.5-2 times. The paper outlines ways to solve the problem in the distribution of directions with mainly freight and passenger traffic to increase the traffic capacity of transportation on the rail network. Among the activities, there is the transmission of transit freight flow on parallel runs. Furthermore, changing the operation conditions of railways in the case of implementing the high-speed trains traffic requires strengthening the existing railway lines in the event of insufficient reserves.
Innovative Approaches to Railway Track Alignment Optimization, in Curved Sections
(Óbuda University, Budapest, Hungary, 2024) Kurhan, Mykola; Kurhan, Dmytro; Hmelevska, Nelya
ENG: The efficient advancement of railway transportation is impossible without the integration of cutting-edge innovations. This study places emphasis on the application of computer modeling for railway track alignment, enabling the determination of an optimal strategy for rectifying curves within the plan. This approach ensures enhanced accuracy and effectiveness in curve realignment efforts. The calculations involved in plan correction are not only essential for addressing track deviations but also for solving a set of challenges associated with increasing permissible travel speeds. Particular significance is attributed to the reconstruction of track alignment, especially for international routes transitioning from wide (1520 mm) to standard European gauge (1435 mm). The incorporation of innovative technologies for railway curve correction, along with line plan optimization across multiple track sections, facilitates the realization of maximum stipulated velocities while ensuring safety, smoothness of motion, and passenger comfort. The investigation results detailed in this paper were conducted with support from a grant provided by The National Research Foundation of Ukraine under the project, "Scientific Justification of the Introduction of the European Track on the Territory of Ukraine in the Post-War Period".
Innovative Technologies for the Introduction of High-Speed Train Operation (on the Example of Track Maintenance in the Plan)
(Technologija, Kaunas, Lithuania, 2022) Kurhan, Mykola ; Kurhan, Dmytro ; Husak, Marina ; Hmelevska, Nelya
ENG: The purpose of the work is to research the process of introducing innovative technologies in the organization of highspeed train operations. The new knowledge is based on such scientific approaches as a comprehensive and detailed study of various aspects of innovative activities, which has provided an opportunity to increase the interoperability of the European transport system and recommend measures to organize high-speed train operations. The research used analysis methods to study the main directions in the introduction of innovative technologies and technical solutions in the field of, firstly, track infrastructure, scientific publications on the current state and trends in the European system of international railway transport, including innovative ways of development.
Maintenance Reliability of Railway Curves Using Their Design Parameters
(Óbuda University, Budapest, Hungary, 2022) Kurhan, Mykola ; Kurhan, Dmytro ; Hmelevska, Nelya
ENG: Based on the conducted monitoring of the railway track operation, it is shown, that most curves fail to meet the source nameplate data. Proposals have been developed to reduce the intensity of the track disorder, due to the reduction of curve parameters to the normative requirements, operating in Ukraine. Recommendations obtained in this work will contribute to the effectiveness of design decisions, determine the quality of the reconstruction projects in general and the expediency of its implementation in particular, they will be useful for carrying out activities to improve the smoothness of trains movement, increase the speed and level of travel comfort, in the curved tracks, especially in the future development of high-speed train implementations.
Modeling the Dynamic Response of Railway Track
(IOP Publishing, Kharkiv, 2019) Kurhan, Dmytro ; Kurhan, Mykola
ENG: The authors developed a model based on the dynamical theory of elasticity, which allows us to describe the dynamic equilibrium of strains of the railway track layers. The model of the stress-strain state for the railway track consists in a combination of the geometry equations of the outline of a part in the system’s space, involved into interaction at a given time and the equations of the dynamic equilibrium of its deformation. Considering the obligation to register the course of the process in time, for each time step of integration the outline of the strains propagations front is determined. The strains propagations front is described by the equations of propagation in the material of the elastic spatial wave of oscillations. It allows determining complete spatial-temporal account of the deflection dynamics of the rail support, which enables the execution of calculations, including for conditions of fast-speed and high-speed trains. With the application of the developed model, a number of scientific and practical problems were solved.
Numerical Analysis of Stabilization Schemes for the Deformed State of Railway Embankment, Using Piles
(Óbuda University. Budapest, Hungary, 2025) Tiutkin, Oleksii L.; Kurhan, Mykola; Kurhan, Dmytro; Miroshnyk, Vitalii
ENG: This article presents a numerical analysis of stabilization schemes for the deformed state of a railway embankment using piles. The study involves the analysis of the concept of reinforcing the railway embankment with horizontal and vertical elements, as well as the main stabilization schemes for the deformed state. The objective is to select a stabilization scheme characterized by a minimal number of reinforcing elements that are sufficient to maximally reduce vertical displacements. For the numerical analysis, six finite element models were developed, which helped obtain the deformation results for the unreinforced embankment and five reinforcement options. Following the numerical analysis of the options with vertical and inclined reinforcement elements, the overall deformed state of the finite element model in the vertical plane was obtained. The results of vertical displacements of the reinforced railway embankment demonstrate that the installation of piles, created based on the jet grouting technology, reduces deformations by 1.50 to 1.88 times.
Perspectives of High-Speed Train Traffic in Ukraine at the Stage of Integration with the European Network
(Kaunas University of Technology, Kaunas, Lithuania, 2021) Kurhan, Mykola ; Kurhan, Dmytro ; Husak, Marina ; Hmelevska, Nelya
ENG: The extension concept of the high-speed network for Eastern European countries has been formulated the implementation of which will allow integrating the railways of Ukraine into a high-speed network of Europe. Based on the analysis of long-term tasks, the following issues are subject to the rationale: the implementation of speed (161-200 km/h) and high- speed (250-350 km/h) train traffic in Ukraine, transition to a new track, which in its parameters will ensure the implementation of high-speed train traffic, the use of rolling stock with the tilting of car bodies, constructing the uropean standard gauge. Based on the results of scientific developments, the authors outlined the ways to solve the problem concerning the designing route of the high-speed network and the creation of a
Problems of Providing International Railway Transport
(Український державний університет залізничного транспорту, Харків, 2018) Kurhan, Mykola ; Kurhan, Dmytro
ENG: Due to its geographic location and developed transport infrastructure, Ukraine has a significant potential in the development of cargo transportation, primarily in international traffic, in particular as a transistor country in the logistics chain of trade between Asia and Europe. The possibilities of railway transport for the organization of transportation between the countries of the European Union and Ukraine are not used to the full extent, since there is a number of technical reasons of the transport systems incompatibility between Ukraine and European countries. In the course of the research, methods of analysis and synthesis were used to study prospects of the European and domestic system of international railway transportations, the experience of creating, operating and optimizing these systems. To compare the above mentioned options, the authors developed a model for predicting and assessing the efficiency of railway transport from the border of one state to the border of the other one.
The Prospect of Using the Dual Gauge Line for the Ukraine–Hungary Railway Connection
(Budapest University of Technology and Economics, 2023) Kurhan, Mykola ; Fischer, Szabolcs; Kurhan, Dmytro
ENG: There are several international transport corridors in Hungary. Záhony railway station is one of the largest hubs in Europe, providing a railway connection between Ukraine and the European Union. Two different railway tracks meet and come together here, such as the standard (1435 mm) and broad (1520 mm) gauges. The availability of a developed infrastructure of the dual gauge on the territory of Hungary presupposes the corresponding development of the railway connection by Ukraine. In order to effectively use the dual gauge line and solve problems of special design, it is necessary to ensure the appropriate train flows. This research aims to provide scientific support for express analysis of the railway routes' competitiveness between Ukraine and the European Union to define the determining factors. The application of such approaches provides a tool for establishing the prospects for the development of existing railway lines, considering their features. Scientific approaches to creating methods for determining the priority areas of railway transport have been further developed. Apart from involving such essential indices as average speed and traffic volumes, the authors added the possibility of considering the presence of lines with such design features as single-track sections, non-electrified, dual gauge, etc., on the route. The theoretical background is applied as a tool for rapid calculations for increasing the competitiveness of the Chop–Záhony dual gauge line.
Providing the Railway Transit Traffic Ukraine–European Union
(Akadémiai Kiadó, Budapest, 2019) Kurhan, Mykola ; Kurhan, Dmytro
ENG: The authors developed a model for predicting and assessing the efficiency of railway transport from the border of one state to the border of the other one, taking into account all expenditures by the net present value indicator net present value of discounted cash flow. The results allows planning measures to accelerate the cargo delivery, both on the territory of Ukraine, and during the transfer of cargoes at border stations, to predict the revenue generation from the implementation of international transportation, which is very important for attracting investments.
Railway Track Representation in Mathematical Model of Vehicles Movement
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2017) Kurhan, Mykola ; Kurhan, Dmytro
ENG: Purpose. The tasks of modeling the interaction of track and rolling stock are basic ones for most areas of modern scientific research of railway transport. The compilation of the model by the principle of Lagrange d'Alembert has found a very wide application for solving the problems of rolling stock dynamics. Representation of the railway track in the model of vehicle movement can be implemented in several ways, which, among other things, will differ in detail. The purpose of this work is to create a methodology for representing the railway track in mathematical models of interaction with rolling stock and obtaining practical results for different characteristics and design of the track and the level of maximum speed. Methodology. The problem consists of determining such track characteristics as the reduced mass, the stiffness coefficient, and the dissipation coefficient. As a tool for solving this problem we used the model of the stress-strain behavior of the railway track based on the joint use of the elastic wave propagation equations to describe the topography of the part of the system that is involved in the interaction at a given time and the equations of dynamic equilibrium of its deformation. This makes it possible to take into account the dynamics of the deflection of the underrail base, which is especially important for the conditions of passenger traffic, which can be carried out at high speed. Findings. The authors obtained theoretically justified stiffness and dissipation coefficients of the railway track for calculating the dynamics of rolling stock in modern models based on systems of equations in accordance with the Lagrange d'Alembert principle. The established values, in contrast to those given in other sources, have a reasonable dependence on the track design and the speed of movement. Originality. The authors expanded the approaches of railroad track representation in models of rolling stock described by systems of equations by the Lagrange-d'Alembert principle. The paper presents the developed method for determining the characteristics of the railway track for such models is based on the results of variant calculations of the dynamic deflection of the rail from the passage of the wheel. Practical value. The authors obtained the values of the stiffness and dissipation coefficients of the railway track depending on the design and speed of motion for practical use in appropriate models of interaction between track and rolling stock.
Rationale of Priority Areas of Rail Operation in North-Eastern Europe
(Kaunas Univ. of Technology, Palanga, Lithuania, 2019) Kurhan, Mykola ; Kurhan, Dmytro ; Černiauskaite, L.
ENG: Abstract. The methodology for assessing the importance of railway routes by generalized ratings reduced to the geometric a criterion has been further developed. The results were obtained for the countries of Eastern Europe, including the extension of the Rail Baltica line. The geometric average of the relative criteria was applied as a composite index for assessing the routes.
The Role of Domain Size and Boundary Conditions in Mathematical Modeling of Railway Tracks
(MDPI, Basel, Switzerland, 2025) Fischer, Szabolcs; Kurhan, Dmytro; Kurhan, Mykola; Tiutkin, Oleksii L.
ENG: In developing a mathematical model of a railway track, the question of determining the dimensions of the modeling domain inevitably arises. If the modeling area is too small, boundary effects may significantly influence the results, reducing their accuracy. Conversely, excessively large areas can increase computational complexity without substantial improvements in accuracy. An optimal choice of dimensions enables the balancing of computational costs and accuracy. Solving this problem is non-trivial, as it depends on numerous factors, primarily the type of mathematical model and the problem being addressed. In most cases, preference is given to minimal domain sizes that ensure the approach’s adequacy. The aim of this study is to justify the dimensions of the modeling domain by addressing such tasks as load scaling, introducing additional boundary conditions, and making relevant assumptions. The main object of the study is the minimum adequate longitudinal length of the track for the spatial model. The research is based on the analytical application of modern approaches in the theory of elasticity. The results are analyzed using mathematical methods, such as modeling the railway track through the propagation of elastic waves and finite element modeling. These findings can be applied to a wide range of problems related to the mathematical modeling of the stress–strain state of railway tracks.
A Systematic Approach to Designing High-Speed Railway Track: European Perspective
(Printing House “Technologija”, Kaunas, Lithuania, 2024) Kurhan, Mykola; Kurhan, Dmytro; Hmelevska, Nelya
ENG: This paper presents a systematic methodology for designing European-standard railway tracks, considering topographical and geological factors. The objective is to analyse various scenarios and assess the feasibility of constructing European-standard railway tracks in Ukraine. The study is based on an analysis of scientific developments in the field of railway design and construction across different track gauges.
Use of Container and Piggyback Services in International Railway Traffic
(Springer, Cham, 2020) Kurhan, Mykola ; Kurhan, Dmytro ; Černiauskaite, Laura
ENG: A modern cargo owner imposes rather strict requirements on transport services in terms of delivery time, cargo safety, quality of forwarding services. In the current conditions, it is necessary to explore the possibility of developing new additional types of carriage on rail transport, in close cooperation with the road transport. In the interaction of rail and road transport the reliability, speed and carrying capacity of the first one is combined with the flexibility and efficiency of the other. However, many issues within the framework of interaction between rail and road carriers still require scientific solutions – from the selection of criteria to a comprehensive assessment of the effectiveness of piggyback transportation. Principles of transport service quality management were formulated and evaluation criteria were determined. Piggyback traffic in the direction of Odessa-Klaipeda will allow Ukraine, Belarus and Lithuania to maintain roads, ensure purity of environment, make it possible to save fuel, as well as allow owners and carriers to significantly reduce operating costs and improve the quality of services provided.