Факультет "Транспортна інженерія" (раніше ф-т "Механічний")

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ENG: Faculty of "Transport Engineering" (formerly Faculty of Mechanical Engineering)

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10 лет отечественной отрасли пассажирского вагоностроения: история, сегодняшний день, перспективы развития
(ТОВ ЦІТУ, м. Харків, 2011) Приходько, Владимир Иванович; Хворост, Е. Ф.; Лутонин, Сергей Витальевич; Шкабров, Олег Анатольевич; Пшинько, Александр Николаевич; Мямлин, Сергей Витальевич; Донченко, Анатолий Владимирович
RU: Статья посвящена десятилетию отечественной отрасли пассажирского вагоностроения. История, сегодняшний день, перспективы развития.
About the Evaluation of the Longitudinal Forces Level Effecting the Track Displacement at Transient Modes of Train Movement
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2015) Masleieva, Liudmyla H.; Ursuliak, Liudmyla V.; Arsonov V. V.
EN: Purpose. Study the transient modes effect of movement on the track displacement for the freight train safety control is supposed in this paper. For this it is necessary to investigate the longitudinal dynamics of a train on the track displacement. Simultaneously to assess the longitudinal forces level of a track and rolling stock interaction. Methodology. The level of the longitudinal forces, effecting the track displacement, was evaluated using mathematical modeling of longitudinal vibrations of the trains at transient modes of motion caused by braking. It was considered that each train vehicle consists of a body (solid) and the wheel sets, connected with the body by friction bearings (inelastic link). It was believed that during the movement of each train vehicle the vertical plane of its symmetry coincident with the vertical plane of symmetry of the assembled rails and sleepers. At simulation it was also supposed that in the process of translational motion of the vehicle body wheels make pure rolling along the rail without slipping on it. Findings. In the results of calculations the values of the longitudinal forces at different types of braking were obtained (it is regenerative braking and pneumatic one) under quasi-static and shock transients. For this various initial state of clearances in the inter-car connections up to beginning of transient was considered. The level of dynamic additives to longitudinal forces of interaction between wheel and rail that are substantially depending on vehicle accelerations was assessed. Originality. The transient regimes effect of trains movement caused by braking on the level of the longitudinal forces of track and rolling stock interaction was investigated. The longitudinal load of freight trains with regenerative and pneumatic braking was researched. The effect of the initial state of the train and different modes of braking on a dynamic additive to the longitudinal forces of the interaction between the track and rolling stock, which may effect the displacement of assembled rails and sleepers, was estimated. Practical value. The obtained results can be used to select rational modes of braking of freight trains, especially on lengthy down grade, from the positions prevent possible track displacement.
Adaptation of Ukrainian Grain Elevators for Unit Train Loading
(Kaunas University of Technology, Kaunas, Lithuania, 2018) Kozachenko, Dmytro M.; Bobrovsky, Volodymyr I.; Ochkasov, Oleksandr B.; Shepotenko, Anatolii P.; Hermaniuk, Yuliia M.
ENG: The aim of the paper is to improve approaches to the design and operation of private sidings of grain elevators for loading of unit trains. The research is based on the methods of organizing of railway operation. One of the main methods of reducing costs in the logistics chain, which provides for the export of grain cargoes is the using of unit train technology for transportation. Introduction of this technology in Ukraine is limited by the low loading capacity of elevators. In the paper the basic schemes of track development of elevator private sidings and analyzes the use of different technical means for performing shunting operations are presented. The results of the performed research can be used for designing and reconstruction of the existing elevators and for building the new ones, as well as for estimating the costs associated with different logistic schemes for grain delivery to seaports. As result the work develops a methodology and obtains a technical-operational assessment of the technical equipment and the operation technology grain elevator private sidings for loading of unit trains.
Advances in railway vehicles and infrastructure engineering
(AIME, 2026) Kalivoda, Jan; Neduzha, Larysa O.
ENG: The present Special Collection is devoted to current advances in railway vehicles and infrastructure engineering, a field that has gained renewed strategic importance in the context of sustainable mobility, climate goals, and the rapid development of transportation systems. Rail transport is increasingly expected to combine high levels of safety, energy efficiency, environmental performance, and operational reliability, while simultaneously responding to growing demands for capacity and speed. The Special Collection brings together 11 contributions that reflect these challenges and offer an interesting overview of recent methodological, technological, and applied research directions that shape contemporary railway engineering.
Analysis of Problem Related to Experimental Data Processing in the Study of the Rolling Stock Influence on the Track
(KTU leidykla „Technologija“, Kaunas, Lithuania, 2022) Bondarenko, Iryna; Keršys, Robertas; Neduzha, Larysa
ENG: In paper discusses the problem of the correctness of the unification of experimental data by axes and points of measurement. The purpose of the study is to analyse experimental data in the study of the influence of the rolling stock on the railway track associated with the change of the nature and ratio of values of forces and stresses when combining data. Experimental data obtained from the study of the influence of Tulpar Talgo on the railway track were considered. The main feature is the construction of a trolley having one wheel instead of two, which makes it possible to show the nature of changes in stresses and forces when grouping data. This made it possible to assess the correctness of the unification in terms of the nature of the force ratio for the passage of rolling stock in the study area.
Analysis of Rolling Stock Coupling Designs and Technologies for the Implementation of International Railway Operations Between Ukraine and the European Union
(Lviv Polytechnic National University, 2025) Batig, Andriy; Pulariia, Andriy L.; Tereshchak, Yuriy V.
ENG: The purpose of this study is to analyze the existing and prospective coupling device designs and technologies for their application in organizing international railway operations between Ukraine and the European Union. The research identifies the main technical barriers associated with domestic rolling stock and explores optimal pathways for integrating Ukrainian rolling stock into the European transport system. The study also considers the possibility of adapting EU-member-state wagons for operation within the railway network of JSC “Ukrzaliznytsia”. An analysis of regulatory and technical documentation was conducted, including DSTU, UIC, and EN standards, as well as regulatory documents of the Council for Rail Transport, which define the requirements for coupling devices and rolling stock. A comparative review was conducted, followed by a detailed investigation and analysis of the design, operating conditions, and structural features of various types of couplers: SA-3 automatic couplers, screw couplings, universal systems, and digital automatic coupling systems (DAC). The research employs a systematic approach, providing a comprehensive assessment of operational performance, safety levels, and the economic feasibility of deploying each of the examined coupling technologies. The object of the study comprises the designs and performance characteristics of railway rolling stock coupling devices and the technologies governing their use in international railway operations on both 1520 mm and 1435 mm gauge networks. The results obtained based on a systematic analysis of regulatory documents for rolling stock operating on 1520 mm and 1435 mm gauge networks, as well as the design features and engineering solutions of coupling systems. They also include the identification of key directions for the development and implementation of modern coupling technologies for international railway operations involving both freight wagons and passenger rolling stock. The analysis considers the specific operational conditions at border crossing points and stations, as well as the local operational and environmental constraints that affect rolling stock operations. A comprehensive assessment of the compatibility between SA-3 automatic couplers and screw coupling systems under international transport conditions between Ukraine and EU member states has been performed. Contemporary technologies enabling the adaptation of rolling stock for joint operation on 1520 mm and 1435 mm gauge networks have been systematized, including adapter devices, variable-gauge systems, and combined coupling configurations. A model for the phased integration of the Ukrainian automatic coupling system into European standards has been developed, utilizing transitional technical solutions. The results of the research can be applied to the development of technical regulations for rolling stock modernization, wagon and train handling technologies, and engineering solutions for designing wagons and locomotives intended for interoperable operation on both 1520 mm and 1435 mm gauge systems. The proposed recommendations will help reduce dwell times at border crossing points by eliminating the need for coupling device replacement. Additionally, they will help reduce operating costs and increase the efficiency of logistics processes for wagons equipped with screw coupling systems by automating train formation procedures, while enhancing operational safety. The findings of this study may be useful for infrastructure projects aimed at integrating the Ukrainian railway network into the European transport system.
Analysis of the Dynamics of Freight Cars With Lateral Displacement of the Front Bogie
(Jomard Publishing, Azerbaijan, 2021) Shvets, Angela O.
EN: The importance of traffic safety issues increases with train speed increase. The question of determining the permissible speeds, which is associated with the assessment of the dynamic qualities of the rolling stock is especially important. A quantitative assessment of dynamic indicators can be obtained by the method of mathematical modeling. The article is devoted to the study of the influence of lateral displacement of gondola car bogies on their main dynamic and interaction indicators between rolling stock and rails. Theoretical study is conducted using the model of spatial vibrations of coupling of five cars in the freight train. During the calculations the change in the rotation angle of the central axle of the car body was considered, which leads to the mutual transverse displacement of the bogies. The rear bogie of the freight car is located along the longitudinal track axle, and the front bogie has a transverse displacement corresponding to the rotation angle of the body along the track axle in the range from 0 to 0.01 radians with a plus sign, which increases the striking angle of the front wheel set on the outer rail. As a result of the research, the dependencies of the dynamic indicators of a freight car on the value of the body rotation angle and the movement speed were obtained. Based on the theoretical calculations, the influence of the lateral displacement of the car's running gears on the dynamic qualities of the rolling stock and interaction indicators of the rolling stock with the rail track, taking into account the movement speed along a curvilinear track section with irregularities, is assessed.
Analytical Determination of the Reduced Rotational Resistance Coefficient of the Construction Machine Slewing Gear
(Дніпровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2019) Bondarenko, Leonid N.; Posmitiukha, Oleksandr P.; Hlavatskyi, Kazymyr Ts.
EN: Purpose. Designing new models of construction machines is closely related to the development of slewing gear, and that, in turn, has a drive whose power and dimensions depend on the rotational resistance and the reduced fric-tion coefficient in the units. The absence of analytical dependencies for determining the reduced coefficient of friction for the rotation of construction machines, first, restricts the designer's ability to select materials, and secondly, does not allow the adoption of optimal design solutions. Therefore, the purpose of the article is to find analytical solutions to determine the rotational resistance in the slewing gear of construction machines, which allows project-ing more advanced gears and machines in general. Existing techniques are based on empirical dependencies and experimental coefficients that reduce the accuracy of calculations, increase the size and cost of work. It is proposed to improve the accuracy and simplify the process of determining the rotational resistance and the magnitude of the reduced rotational resistance coefficient of the building tower cranes. Methodology. The set objectives can be achieved by means of analytical dependencies for determination of rolling friction coefficients over linear and point contacts. This will enable to find the more accurate value of the resistance coefficient, and the constructor during the calculations to take targeted measures to reduce it, using the mechanical constants of materials of the units and their geometric parameters. The calculation is based on Hertz contact deformation theory and the body point plane mo-tion theory. Findings. The obtained dependencies will allow analytically to find the resistance of rolling resistance of rollers in construction machines with fixed and rotating pillars, with circular rotary devices, as well as in ball and roller slewing rings. The calculated values of the rotational resistance coefficients for some types of mechanisms give similar values with those recommended, while for others they significantly differ and require their refinement in reference values. Originality of the work consists in the use of analytical dependences for determining the reduced coefficient of the rotational resistance over linear and point contacts using Hertz contact deformation theory and Tabor partial analytic dependencies theory. Practical value. The obtained dependencies will allow to design new types of slewing gear units of the construction machines and to reveal the additional rotational resistances.
Analytical Method of Determining the Movement Resistance of a Tip for Forming Rectangular Technological Hole in the Lower Structure Tracks
(IOP Publishing, 2020) Posmitiukha, Oleksandr P.; Hlavatskyi, Kazymyr Ts.; Kravets, Svyatoslav V.; Suponyev, Volodymyr; Koval, Andrey
EN: Abstract. The aim of this work is to theoretically determine the total resistance to soil pricking with a wedge-shaped tip to create a rectangular cavity and to determine the influence of the size of the working equipment and soil environment in the repair of earthenware or areas where trench technology can-not be used. To determine the forces of the recess of the replaceable pilot, the law of change of soil pressure on the working surfaces of the working equipment was first determined, which is based on the idea of the change of the soil elastic state at its compaction was determined, which is determined by the compression module of deformation of the soil. The processes occurring during the formation of wells and new approaches to the improvement of calculations have been described. On the basis of the pro-posed model of the piercing process, the laws of change of the normal pressure of soil resistance on the surface of the wedge working equipment are established. Based on its value, the results of theoretical studies have received a rational form and parameters of the tip of the work equipment.
Application of APM WinMachine Software for Design and Calculations in Mechanical Engineering
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2016) Neduzha, Larysa; Shvets, Anzhela O.
EN: Purpose. To conduct the research at all stages of design, development, operation, residual operation life determination, namely, preliminary study, action principle choice, design of draft and technical projects, their optimization, preparation of design documentation and control information for automated production, comprehensive engineering analysis, it is required to use the latest computer technologies. Their use can not only present data and information in some way, but also gives the opportunity to effectively and directly interact with the information object that is created or demonstrated. Methodology. To perform engineering calculations associated with the analysis of the strength of machines, mechanisms, constructions one uses both analytical and numerical methods in practice. The most common method for analysing the stress-strain state of object models, obtaining their dynamic and stability characteristics at constant and variable modes of external load is the finite element method, which is implemented in many famous and widespread software products, providing strength calculation of models of machines, mechanisms and structures. Findings. The use of modern software for designing machine parts and various types of their joints and for strength analysis of structures is justified. Colour charts for distribution of stresses, displacement, internal efforts, safety factor and others allow accurate and quick identification of the most dangerous places in the structure. The program also provides an opportunity to «look» inside the elements and see the resulting distribution of internal force factors. Originality. The paper considered the aspects, which are unexplored at present, associated with the current state and prospects of development of industrial production, the use of software package for design and calculations in the mechanical industry. The result of the work is the justification of software application for solving problems that are aimed at using research findings for various practical tasks in specific fields of mechanical engineering. Practical value. Compared with other software systems, popularity of the considered one is explained by easy mastering of the system, quick implementation both in training and in production process The organizational structure, «friendly» graphical interface and accessible language make learning and use of the program very convenient. These and other factors actually reduce the time for project implementation, emphasize the relevance and the practical importance of the software system, which is appreciated by its users.
Assessment of Forces Acting on the Gondola Car Body during Transportation of Rolled Wire Bundles
(Portal hrvatskih znanstvenih i stručnih časopisa - Hrčak, 2026) Shvets, Angela O.; Shaposhnyk, Vladyslav Yu.; Muradian, Leontii A.; Shvets, Anzhelika O.; Reidemeister, Oleksii H.; Shykunov, Oleksandr A.; Molchanov, Dmytro
ENG: The article gives an assessment of the possible reasons for the fall of a gondola car wall onto the side track, which occurred on the section of the regional branch of the Pridneprovskaya Railway. To determine the possible reasons for the breakage of the car side wall, a comparison of the forces acting from the side of rolled wire bundles on the car body structure with permissible loads on the body elements was made. Vertical and transverse inertial forces and forces from the load thrust were considered as such forces. The total loads obtained as a result of the calculation do not exceed the permissible values for gondola car bodies and confirm that the considered local technical conditions for stowing rolled wire bundles met the current requirements and did not cause a breakage of the side wall of the gondola car body.
Assessment of Locomotive and Multi-unit Fatigue Strength Considering the Results of Certifi cation Tests in Ukraine and EU Countries
(Instytut Kolejnictwa, Warszawa, 2017) Kostrytsya, Sergiy A.
EN: The comparative analysis of methods for assessing the fatigue strength of the rail vehicle used in the Ukraine and the EU is described in this article. As a result of the comparison, the following main diff erences of the indicated methods are distinguished: 1. In Ukraine, fatigue strength assessment is carried out using the fatigue strength factor, which should not exceed the normative value. In the countries of the European Union, the fatigue strength is evaluated according to the permissible stresses, and the permissible stresses are determined using stress strain diagrams. 2. According to the requirements of the Norms in Ukraine for determining the fatigue strength factor, the endurance limits of standard samples in a symmetrical loading cycle are used. Th e stress limit diagrams, which are used in European norms, are constructed for characteristic structural elements taking into account the asymmetry of the stress cycle coeffi cients. Analytic studies and analysis of experimental data carried out by the author have made it possible to develop a number of recommendations aimed at increasing the reliability of the results of estimating the fatigue strength of load-bearing structures of selfpropelled rolling stock and to make proposals for harmonizing the relevant regulatory documents in Ukraine and the EU countries.
The Assessment of Negative Impact of Oil Products on Railroad Track and Rolling Stock Constructions
(Kaunas Univ. of Technology, Lithuania, 2019) Zelenko, Yuliya V.; Lunys, O.; Neduzha, Larysa O.; Steišūnas, S.
EN: Abstract In order to ensure the reliability of metal elements in structures of railway infrastructure, the influence of solutions is investigated that contain oil products on the degree of corrosive changes of steels of grade 3, 5, RSt37-2, 09G2D and grey cast iron 21-40. On the basis of experimental data that were obtained using R-5126 polarization resistance indicator, potentiostat P-5827 mathematical relations of the influence of various fractions of oil products on the rate of metal corrosion are introduced. The obtained data can be used for non-destructive control of basic elements of structures, the choice of effective inhibitors for reducing the corrosive aggressiveness of the environment and the protection of structural elements.
Assessment of the Railway Track Deformability Behaviour as the Parameter of Operational Availability Function
(Printing House “Technologija”, Kaunas, Lithuania, 2021) Bondarenko, Iryna; Keršys, Robertas; Neduzha, Larysa
EN: In paper discusses the problem of the maintenance conditions of the railway track to ensure operational availability in terms of ensuring reliability and maintainability program. The research aims to assess the amount of work spent in railway track deformability under vehicle influence when various railway track stiffness and at different speeds of the vehicle. The research aims to assess the amount of work spent in railway track deformability under vehicle influence when various railway track stiffness and at different speeds of the vehicle. Authors considered the influence of the vehicle speed movement on the vertical dynamic load from vehicle to the rail, the vertical dynamic rail deflection, and vertical dynamic stiffness of the railway track. It allowed estimating the amount of deformability work performed by the rail at vertical load.
Aлгоритм вирішення задачі контакту колеса і рейки
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2006) Савчук, Орест Макарович; Рейдемейстер, Олексій Геннадійович; Савченко, Костянтин Борисович; Шикунов, Олександр Анатолійович
UK: Наведений алгоритм вирішення контактної задачі силової взаємодії пари «колесо–рейка» у сучасній постановці з використанням детального математичного моделювання колеса і рейки методом скінченних елементів.
Calculation of Parameters of Switching Unit with Corrective Links in Thruster Dc-Dc Converters
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Bobyr, Dmytro V.; Kolodii, D. O.
ENG: The engineering method of calculating parameters of commutation unit at the stage of designing thruster converters is considered.
The Calculation of Stress Intensity Factor Steel of Railway Wheels
(Silesian University of Technology, Katowice, Poland, 2020) Vakulenko, Ihor O.; Proydak, Svetlana V.; Askerov, Hangardas
EN: From an analysis of the dependence complex of carbon steel properties on structural parameters, it was found that for an isostructural state, the influence of austenite grain size on impact strength exceeds the dependence on carbon content. As a result of explaining correlation relationships between individual mechanical characteristics, to evaluate critical stress intensity factor, a relationship is proposed based on the use of impact strength. The proportionality coefficient in proposed dependence is determined by ratio of elongation to narrowing at tensile test.
A Case Study of the Use of Statistical Processing of the Armature Rotation Irregularities for the Diagnostics of Locomotive Traction Electric Motors
(Vilnius Gediminas Technical University, 2025) Bodnar, Boris Ye.; Ochkasov, Oleksandr B.; Hryshechkina, Tetiana S.; Petrenko, Viačeslav
ENG: Locomotive Traction Electric Motors (TEMs) generate power to rotate the wheelsets of diesel or electric locomotives, electric or diesel multiple units. TEMs are the most critical parts of traction rolling stock on which exploitation costs, reliability and train traffic safety depend. The purpose of the article is to evaluate the possibility of diagnostics the technical condition of the TEM using the rotation irregularities of the armature shaft in the electric motor as a diagnostic parameter. The article analyses the main causes of TEM failures and methods for diagnosing electric motors in operation. The expediency of using the rotation irregularities of the armature shaft in the electric motor as a diagnostic parameter is substantiated. The structural flowchart of the device for measuring the rotation irregularities of the armature is presented. Diagnosing the mechanical part of an electric motor is chosen as an implementation example. The authors confirmed the connection between the technical condition of the electric motor and the statistical indicators calculated for the signal of the rotation irregularities of the armature shaft.
Changing the Stress State of the Track Superstructure while Strengthening the Subgrade
(VŠB – Technical University of Ostrava, 2020) Tiutkin, Oleksii L.; Neduzha, Larysa O.; Kalivoda, Jan
ENG: Strengthening the subgrade with the help of various technologies significantly affects the stress state of the track superstructure. The strengthening of the subgrade with piles, leads to an abrupt stiffening of the track superstructure, which is problematic for its normal operation. Two finite element models were created to determine the change in the stress state of the track superstructure when strengthening the subgrade. They fully reflect the geometric, deformation and power characteristics of a real subgrade, which is strengthened by piles. Individual finite elements of the models are provided with the deformation characteristics of the steel rails, reinforced concrete sleepers, soil subgrade, ballast and soil-cement material of piles. The authors carried out the calculation of stress state of the track superstructure for two finite element models. Results are obtained and analyzed to help in choosing the most effective option for strengthening the subgrade.
Choosing of Suspension Gear Parameters of Coache Model 61-779
(Department of Railway Vehicles, Aircraft and Ships, BME Section of Rolling Stock, SSME, Budapest, Hungary, 2013) Myamlin, Serhiy V.; Prikhod'ko, Vladimir I.; Zhyzhko, Victoriia V.; Shkabrov, Oleg A.
EN: Researches that focused on choosing of running gear's parameters and especially on spring suspension parameters are very important during creation of new passenger rolling stock. In the research calculations that determine strength characteristics of springs of central and axle-box suspension gear of bogies during its (bogies) using under coaches' (passenger cars) model 61-779 of JSC "Kryukov car-building company" are done and relevant dynamic parameters are determined. The simulation used a computer program «DYNRAIL», developed in Dnepropetrovsk National University of Railway Transport (DNURT). As a result of research parameters of spring suspension for designs of new passenger cars chosen.
Choosing the System of Locomotive Maintenance in View of the Effect of Dependent Failures
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2018) Bodnar, Borys Ye.; Ochkasov, Oleksandr B.; Hryshechkina, Tatiana S.; Bodnar, Yevhen B.
ENG: Purpose. Improving the efficiency of the use of locomotives by choosing a rational maintenance system that takes into account the assessment of the effect of dependent failures on the cost of their life cycle is the main purpose of this paper. Methodology. The relevance of introducing LCC (life cycle cost) approaches in locomotive facilities is explained by the introduction of new locomotives with on-board control and diagnostic systems, as well as the development of the theory of traction rolling stock maintenance systems. The cost of a locomotive as a traction unit ceases to be the determining factor. This is because the locomotive maintenance and repair cost for the entire period of its operation is much higher than the initial cost of the locomotive. The paper analyses the existing approaches to managing the cost of the life cycle of locomotives at the stages of selecting, updating, upgrading and operating the traction rolling stock. The necessity of improving the methods for assessing the degree of influence of reliability indicators of locomotive assemblies on the choice of the maintenance system and the cost of the locomotive life cycle is substantiated. Findings. It is proposed to use the concept of «the effect of dependent failures» when calculating the cost of locomotive renewal after unscheduled repairs and its life cycle cost. We improved the methods for determining the cost of unscheduled repairs, taking into account dependent failures and the coefficient of assessment of the effect of dependent node failure on the locomotive maintenance system. The proposed coefficient will determine the nodes, the failure of which affects the renewal cost more than their nominal value. It will also help to take into account the probable losses due to node failure during the development and adjustment of the locomotive maintenance system. Originality. For the first time, it is proposed to use the concept of the effect of de-pendent failures to calculate the locomotive renewal cost when performing unscheduled repairs, as well as the loco-motive life cycle cost. Practical value. The improved calculation method for determining the cost of unplanned repairs with account taken of dependent failures can be used to compare and evaluate different variants of the locomotive maintenance system and to develop the locomotive diagnostic systems.
Classification of Quality Conditions of a Traction Motor Frame Insulation of Locomotives
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Kapitsa, Michail І.; Laguta, Vasiliy V.; Kozik, Yuriy
ENG: Abstract. The objective of the article is to determine the quality conditions of a locomotive traction motor frame insulation based on observations over the recovery voltage and classification of a tested insulation wear degree as well as to determine estimates of operating time until the insulation restoration or replacement with a new one. To classify the insulation quality conditions and to forecast its residual life until the restoration, a cluster analysis and discriminant analysis are used based on indicators reflecting the properties of an insulation recovery voltage curve. The study defines an information content received from frame insulation recovery voltage readings as compared with its resistance from the perspective of testing the insulation condition and predicting its residual life. Statistical characteristics of clusters corresponding to the insulation condition stages allow determining the limit values of predicting parameters and estimating the residual insulation life prior the restoration. To classify the insulation condition, an integrated evaluation of the insulation condition quality is proposed. Integrated evaluation is performed according to the recovery voltage curve and is used as an indicator during clustering. An experimental study of the proposed method practically confirmed its effectiveness.
Coefficient of Stability Against Lift by Longitudinal Forces of Freight Cars in Trains
(IOP Publishing Ltd., 2020) Shvets, Anzhela O.; Shatunov, Oleksandr V.; Dovhaniuk, Stepan S.; Muradian, Leontii A.; Pularyia, Andriy L.; Kalashnik, Vladimir A.
EN: The paper is devoted to a theoretical study of the car movement stability when exposed to longitudinal forces of a quasistatic nature. The authors obtained the expressions for calculating the resistance coefficient of the car lift by the longitudinal compressive force acting on the car as part of a freight train. The influence of some factor’s combination on the longitudinal forces, at which the car movement stability is still maintained, was analyzed using the analytical dependencies to assess the longitudinal loading of cars in trains. The study was carried out by analytical method for assessing the freight car stability when moving at different speeds along curved track sections. The calculations were made in a curve of small radius taking into account the inertia forces from the unbalanced acceleration. In a theoretical study, the influence of quasistatic longitudinal compressive forces depending on changes in speed and force value, as well as the influence of friction in the wheel flange and rail contact and the eccentricity of fastening the automatic coupler shank on the stability were considered. When applying the results obtained, the stability of freight rolling stock can be increased, which in turn will remove some existing restrictions on the permissible speeds and increase the technical speed of train movement. Using the described methodology for determining the lift resistance coefficient will make it possible to justify the cause of derailment, as well as to develop and put into practice technical measures to prevent the lift of carriages, thrusts and shears of the track.
A Combinatorial Mathematical Model of the Dynamics of the Incidence of Covid-19 on the Example of the Situation in the Ukraine
(Sergeieva&Co, Karlsruhe, Ukraine & Germany, 2024) Sablin, Oleg I.; Zelenko, Yuliia V.; Horobets, Volodymyr L.
UKR: Автори на основі дослідження широкого спектру статистичних даних запропонували математичну модель динаміки поширення COVID-19 та інших подібних інфекцій. Запропонована модель допомагає зрозуміти механізми виникнення гострих респіраторних вірусних інфекцій.
Comparative Analysis of Options for Strengthening the Railway Subgrade with Vertical Elements
(Printing House “Technologija”, Kaunas, Lithuania, 2021) Tiutkin, Oleksii L.; Keršys, Robertas; Neduzha, Larysa
ENG: In paper the task set to investigate and determine the impact of the parameters for strengthening with vertical elements (piles) on the stress and displacement of the track superstructure. The scientific hypothesis is the possibility of selecting such parameters of these elements that minimally affect the stress state of the track superstructure. For this finite-element models of two options for strengthening have been developed. Using a professional complex at different values of deformation characteristics values of displacements and stresses were obtained. The analysis of the stress-strain state for both options reveals that the more effective option of strengthening the subgrade. It has a more positive effect on the deformation state of the subgrade, reduces the vertical displacement of the track superstructure, reduces its stress state, the value of which allows us to testify to the normal operation of the subgrade.
Concept of Determining the Friction Stir Welding Mode
(Національний гірничий університет, Дніпро, 2018) Vakulenko, Ihor O.; Plitchenko, Serhii; Murashova, Nataliia H.; Bohomaz, Volodymyr M.
ENG: Purpose. To determine the optimal mode of friction stir welding of aluminum alloy. Methodology. 2.5 mm thick plates made of aluminum alloy AMg5 with chemical content of alloying elements within grade composition were used as a material for the research. Friction stir welding was carried out using specially designed equipment with a preselected form and dimensions of working tool. At different ratios of the working tool rotation frequency the forces of pressing and speed of its movement along the connecting edges determined the metal heating degree and the quality of welded joint formation. Temperature of the connecting edges heating was determined by thermocouples immersed in metal at different distances from the welded joint. Rotational speed of the working tool was from 800 to 1600 min-1 with the effort of pressing to the plate surface from 580 to 1370 N and the speed of movement along the joint of 50 mm/min. Findings. On the basis of different ratios of the working tool rotation speed and pressing to the connecting edges, there were determined conditions for achieving the effect of constant softening during friction stir welding. In order to achieve a high level of welding joint quality during friction stir welding it is necessary to carry out the process at high revolutions of the working tool and low levels of pressing to the connecting edges. Originality. At the constant speed of the working tool rotation proportional increase in alloy temperature from increasing the level of its pressing to the connecting edges is disturbed by achievement of conditions of the dynamic softening processes development. Practical value. The concept of choosing the technological parameters of welding process is determined, when it is preferred to increase in speed of the working tool rotation when the level of its pressing to the connecting edges decreases.
Consideration of Dependent Failures Impact on Selecting the System of Locomotive Maintenance
(Kaunas Univ. of Technology, Palanga, Lithuania, 2019) Bodnar, Borys Ye.; Ochkasov, Oleksandr B.; Bodnar, Yevhen B.; Hryshechkina, Tatiana S.; Skvireckas, R.
ENG: Modern measures aimed at reducing the operating costs are closely related to such concepts as LCC and RAMS-approach. The article analyzes the existing standards that regulate their usage. The purpose of the research is to improve the methodology for determining the renewal costs of locomotive nodes with due regard to dependent failures. To describe the propagation of dependent failures in the system, the authors propose to use the wave approach. The dependent failures impact on the system is determined on the basis of information about the relationship between elements and data from a technological-economic map concerning the cost of locomotive nodes renewal. To take into account the probabilistic nature, the authors propose to use the methods of expert research for determining the probability of failure of dependent elements. The authors proposed a method for determining the probability of the locomotive nodes breakdown considering the dependent failures. The method of calculating the average cost of unscheduled repair, considering the dependent failures of interrelated elements was improved. For the first time, a recurrence relation on a set is deduced, by which the volume of damage is calculated at the dependent failures of elements in a complex system. The coefficient, which will allow assessing the impact of dependent failures on the maintenance system and the life cycle cost of a locomotive, is proposed. On the basis of the proposed method, the calculations for the electric equipment of electric locomotives, DE1 series were made. A comparison of the renewal cost of electrical equipment with considering the dependent failures of related elements was made.
Construction Analysis of Mechanical Parts of Locomotives
(The Lublin Branch of the Polish Academy of Sciences, 2013) Myamlin, Serhiy V.; Neduzha, Larysa O.; Lukhanyn, Mykola I.
EN: To determine the dynamic properties of the mainline freight locomotives, characterizing the safe movement on straight and curved sections of track in the whole range of operating speeds, you need a set of studies including selection of design scheme, the development of an appropriate mathematical model of spatial fluctuations of the locomotive, making a computer calculation program, conducting the theoretical, and then experimental investigations of new designs. In this case, one should compare the results with existing constructions. One of the necessary conditions for improving the quality of traction rolling stock is to define the parameters of its running gears. Among the questions related to this problem, an important place occupies the problem of determining dynamic qualities of the locomotives at the stages of design, taking into account with the chosen technical solutions in the running gear design. The work focuses on key tendencies of some types of main locomotives embodiment, focusing on improving the running gears design. As a result of investigations one can see that the creation of a modern locomotive requires from designers and scientists realization of scientific and technical solutions providing the design speed increase with simultaneous improvement of the traction, braking and dynamic qualities to provide the simple and reliable construction, especially construction of the running gear, reducing the operating costs, low original cost and operating costs for the total service life, high traction force during take-off, work capability in the multiple traction mode, maximally approximated to the limited clutch and sufficient design speed. Research of mathematical modeling is conducted by the method of numerical integration of the dynamic loading of the main-line locomotive using the software system «Dynamics of Rail Vehicles» («DYNRAIL»). Design features of the running gear elements of some types of the main-line locomotives, which have inclined rods between bogie and the body, transmitting the traction forces between them and providing essential dynamic performance of the carriage motion are studied.
Contemporary Principles for Solving the Problem in Noise Reduction from Railway Rolling Stock
(IOP Publishing, 2020) Zelenko, Yuliia V.; Zelenko, Dariia; Neduzha, Larysa O.
EN: The statistical and monitoring data confirm the significant impact of the operational mode on the most important noise and vibration parameters, which is relevant for ensuring the efficiency and quality of the operational process with regard to ergonomic and environmental requirements. The article analyzes the acoustic parameters of rolling stock of the railway, emphasizes the peculiarities of noise emission from various elements of rolling stock and a track. Existing approaches towards solving the problem in the organization of railway noise control are outlined. On the basis of existing modern methods for measurement and analysis of acoustic parameters, the authors propose conceptual approaches toward monitoring the acoustic parameters, predicting noise characteristics and constructing the noise maps of railways. The algorithm of the developed acoustic model for the operational monitoring of noise load and the possibility to compile a case of noise maps for Ukrzaliznytsia is presented. The proposed algorithm allows at given basic design parameters and speed of rolling stock, known sound-absorbing and dissipative characteristics of all elements to carry out a rational selection of noise-protective measures in accordance with the sanitary noise regulations for a specific receptive facility.
Control of Tandem-Type Two-Wheel Vehicle at Various Notion Models Along Spatial Curved Lay of Line
(Національний гірничий університет, 2015) Beshta, А. S.; Kravets, Viktor V.; Bas, Kostyantyn M.; Kravets, Tamila V.; Tokar, Larisa A.
EN: Wheeled vehicle is considered as a material point under the conditions of non-uniform movement along curved spatial lay of line. Hodograph in a class of spatial lines describes kinematics of a vehicle. A kinetostatics problem of tandem-type two-wheel vehicle is being solved. Equivalent contact dynamics are being determined.
Correlations Between Transportation and the Covid-19 Pandemic
(AIP Conference Proceedings, 2022) Barberi, Salvatore; Arena, Fabio; Termine, Francesco; Canale, Antonino; Olayode, Isaac Oyeyemi; Neduzha, Larysa; Zuccalà, Yuri
ENG: COVID pandemic has abruptly changed people habits and lifestyles worldwide, including the usage and perception towards all the different transportation systems; to this date (mid-2021), the pandemic has been going on for over a year now, and there is still no certainty about when it will end. A drastic decline in the number of commercial flights both national and international has happened, as a consequence of the lockdown policies adopted by the various countries around the globe in order to prevent the infection from spreading around, and with variable trends depending on the period and the reciprocal agreements between the various states. Land-side public transportation too has witnessed a backlash mainly due to similar policies or even not leaving home during lockdowns, often working remotely from home, and switching from public transportation to driving, walking or cycling if necessary. COVID-19 and transport are linked by a two-way relationship: if it is true that COVID-19 impacts on transport systems, it is also true that transport systems, in turn, have a very important role in the spread of the pandemic. Swabs first and vaccines recently, are raising new hopes about the pandemic ending soon. The consequences of COVID-19 will in any case be significant, and will revolutionize the way of conceiving transport, meaning new challenges for scientific research.
Cпосіб виготовлення суцільнокатаного залізничного колеса (патент 127187)
(ДП «Український інститут промислової власності», Київ, 2018) Вакуленко, Ігор Олексійович; Болотова, Дар’я Михайлівна; Грищенко, Микола Анатолійович; Вакуленко, Леонід Ігорович; Кузін, Микола Олегович
UKR: Спосіб виготовлення суцільнокатаного залізничного колеса, за яким при температурах 1200- 1250 °C обтискують заготівку на пресах, при температурах 1000-1050 °C прокатують для формування обода і гребеня, одночасно з поверхнею кочення піддають прискореному охолодженню до температури 400-450 °C бокові поверхні обода, прошивають отвір в маточині, вигинають диск і здійснюють відпуск колеса при температурах 500-550 °C тривалістю 2,5 год. З метою підвищення опору обода колеса роздавленню, прискорене охолодження його бокових поверхонь здійснюється до температури 370-400 °C.
Defining the Limits of Application and the Values of Integration Variables for the Equations of Train Movement
(National Technical University «Dnipro Polytechnic», 2019) Bodnar, Borys Ye.; Kapitsa, Mykhailo I.; Bobyr, Dmytro V.; Kyslyi, Dmytro M.
ENG: Railway transportation is an integral part in the transport infrastructure of our country. They cover passenger and cargo transportations by Ukrzaliznytsia, industrial enterprises, including transportation of the mining sector, which is characterized by heavy loads on the traction rolling stock due to large gradients of the track profile. Railway transport management is always preceded by traction calculations, the center of which is to solve the equation of train movement.Purpose.To determine the rational values of the variables in solving the equation of train movement, as well as relevant limits in their applicability.Methodology. To achieve the purpose, methods of system analysis, nonlinear programming, numerical methods for solving differential equations, namely the classical, Runge-Kutta-Feelberg, and Rosenbrock methods, are used. Computational accuracy was verified using simulation methods and compared with experimental data. Findings. The results of the research involve increasing the calculating speed when solving the equation of train movement without loss of accuracy, which allowed using the proposed method in on-board systems of locomotives. Originality. During the research, new scientifically grounded results were obtained that solve the scientific task in improving the energy efficiency of train operation, and are of great importance for railway transport. The obtained results constitute the originality, which consists in determining the rational limits of applicability and the value in a step of integration variables for the equations of the train movement. Practical value. The research results allow reducing the cost of energy consumed by hauling operations due to the promt recalculation of rational control modes when changing the train situation.
Dependence of Air Spring Parameters on Throttle Resistance
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2016) Reidemeister, Alexey G.; Kivisheva, Anastasiia V.
EN: Purpose. In this paper it is necessary to conduct: 1) research and analyse the influence of throttle element pneumatic resistance on elastic and damping parameters of air spring; 2) to obtain the dependence of air spring parameters on throttle element pneumatic resistance value. Methodology. The work presents the elaborated model of the air spring as a dynamic system with three phase coordinates (cylinder pressure, auxiliary reservoir pressure, cylinder air mass). Stiffness and viscosity coefficients were determined on the basis of system response to harmonic kinematic disturbance. The data for the analysis are obtained by changing the capacity of the connecting element and the law of pressure variation between the reservoir and the cylinder. The viscosity coefficient is regarded as the viscosity ratio of the hydraulic damper, which for one oscillation cycle consumes the same energy as the air spring. The process of air condition change inside the cylinder (reservoir) is considered to be adiabatic; the mass air flow through the connecting element depends on the pressure difference. Findings. We obtained the curves for spring viscosity and stiffness coefficients dependence on the throttle resistance at three different laws, linking airflow through the cylinder with the pressure difference in cylinder and reservoir. At both maximum and minimum limiting resistance values the spring viscosity tends to zero, reaching its peak in the mean resistance values. Stiffness increases monotonically with increasing resistance, tends to the limit corresponding to the absence of an auxiliary reservoir (at high resistance) and the increase in cylinder volume by the reservoir volume (at low resistance). Originality. The designed scheme allows determining the optimal parameters of elastic and damping properties of the pneumatic system as function of the throttle element air resistance. Practical value. The ability to predict the parameters of elastic and damping properties of the pneumatic system as function of the throttle element air resistance will improve the running performance of carriages, the comfort of passenger transportation and reduce the wear of the rolling stock and the track caused by interaction of carriage and rails.
Design Review of Gondola Car
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2014) Myamlin, Serhiy V.; Kebal, Yuriy V.; Kolesnykov, Serhii R.
EN: Purpose. To ensure the constantly growing volume of freight transportations it is necessary to introduce the innovation rolling stock. It should have the best technical and economic parameters in comparison with the existing fleet. Gondola car is the most popular type of railway freight car. Designs of the modern gondolas are based on many years of operating experience and numerous tests carried out by design and research organizations in the field of car building. To improve the body structure of gondolas it is necessary to perform a review of the existing structures and to identify the trends in their improvement. Methodology. The works on improvement the designs of produced gondolas are held by many engineering organizations in almost all industrialized countries. Analysis of the existing body designs of gondola cars is possible by analyzing the research in the field of transport engineering, namely patents, scientific articles, producers catalogues and so on. Findings. When analyzing it was determined that there are gondolas of different designs, but the most common are the gondolas with a solid floor and unloading hatches, the covers of which form the floor of gondola design. An effective method for reducing the gondola empty weight and increasing the body volume is also the use of aluminum alloy instead of steel. Results of the improvement analysis of the gondola bodies` designs showed that the creation of the modern gondola car requires from designers and scientists the implementation of scientific and technical solutions providing the increase of carrying capacity and the body volume, reduction of the gondolas empty weight, increase in repair intervals while improving the strength and dynamic qualities at the same time. Originality. For the first time the gondolas designs were analyzed, their advantages and disadvantages were considered and the trends in improvement of the given structures of gondola cars were determined. Practical value. The generalization of theoretical, scientific and methodological, experimental studies aimed at further improving the technical and economic parameters of gondola cars are urgent when improving the body structure of the gondola cars. The above mentioned design features of the bodies of some models of modern gondola cars have practical value and can be used in further developments.
Determination Activation Energy of Friction Stir Welding
(WRTYS, Kyiv, 2017) Vakulenko, Ihor O.; Plitchenko, Serhii
EN: According to the technology of friction stir welding (FSW) heating of the edges is equal to 0.85-0.9 from the melting temperature of metal (T). Increase in temperature is accompanied by increased degree of the metal stirring, which leads to ambiguous influence on the metal density and concentration of cavities at different distances from the welding joint. At the same time, the temperature gradient across the section of joint leads to a different speed of recrystallization processes development and forming of structural heterogeneity in metal edges. Thus, the relevant question is to determine the optimal scheme of metal edges heating during the implementation of FSW technology. Material for the study was alloy AMg5. For different ratio of rotation speed and pressure on operating tool there were obtained the conditions of superplastic state of alloy at the temperatures of heating at the level of 0.45-0.5 from T, which corresponds to the beginning of dynamic recrystallization development during FSW. At the same time, it was evaluated the energy of activation (EA) of FSW process. Using the analysis of the obtained results it was determined the fact that when reaching the same temperature of alloy heating the EA value of FSW process decreases with increasing the rotation frequency of the operating tool and decreasing the degree of its pressing to the edges of welding joint. On the basis of the above mentioned the development of FSW technology should be directed toward the use of high speed rotations of the operating tool and low levels of its pressing to the alloy edges.
Determination of Characteristics of Throttling Device for Pneumatic Spring
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2018) Reidemeister, Oleksii H.; Laguza, Anastasiia V.
EN: Purpose. This paper focuses on determination of the dependence of the working medium flow on the capacity of the throttling device, its geometric features and the pressure difference in the pneumatic spring cylinder and in the auxiliary reservoir. Methodology. Calculation of the dependence of the working medium and pressure drop is performed in two ways: 1) by numerical simulation of a stationary gas flow through a throttling element; 2) its analytical calculation expression using empirical relationships (control calculation to evaluate the reliability of numerical simulation results). For the calculation, three models of throttling devices were chosen. Dependence of the flow rate of the working medium on the capacity of the throttling device and its geometric features was determined based on the approximation of the dependency graphs of the pressure drop against the mass flow rate of the working medium. Findings. We obtained graphical dependencies between the pressure drop and the mass flow rate of the working medium from the two calculation options. Based on the results of calculations performed with the help of a software package with visualization of the results, we calculated a proportionality coefficient that describes the dependence of the working medium flow on the throttling device capacity and its geometric features for each of the throttling elements considered, with three degrees of closure. The air flow values, obtained by numerical simulation, are greater than the flow rates obtained from semi-empirical formulas. At the same time, they are in good qualitative agreement, and the quantitative difference averages 25%, which can be regarded as confirmation of the reliability of the numerical model. Based on the calculation results, we plotted the proportionality coefficient graphs against the degree of closure of the throttling device. Originality. The work allows determining the degree of influence of the frictional component on the variation of the pressure difference in the pneumatic cylinder and the auxiliary reservoir of the pneumatic suspension system. Also, the work proposes a method to determine the dependence of the working medium on the capacity of the throttling device and its geometric features. Practical value. The ability to predict the operating parameters of the pneumatic system depending on the pneumatic resistance of the throttling device will improve the car running characteristics, increase the comfort of passenger transport, and also reduce the wear of the rolling stock and track gauge due to vehicle-track interaction.
Determination of Dynamic Performance of Freight Cars Taking into Account Technical Condition of Side Bearers
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2013) Myamlin, Serhiy V.; Neduzha, Larysa O.; Ten, Oleksandr O.; Shvets, Angela A.
EN: Purpose. The railway transport plays an important role in social and economic life of the country and carries out the large containment of transportation activities. The transport industry should migrate towards innovation changes and increase its significance as an important transit subsystem on the way of renovation of both the infrastructure and the strategy of all transportation process components including the interaction with other transport modes. At present the life sets strategic challenges for the railway branch, and the basic goals among them are as follows: high-speed train traffic development, increase of the weight of freight trains, new rolling stock development etc. Due to the urgency of this subject, the researchers should cope with the task devoted to one of aspects of improving the freight transportation efficiency, namely to the study of effects of various factors and characteristics of technical conditions of the freight cars running gears (which are unavoidable to arise during operation) on their basic dynamic indices. The deviations of technical conditions of running gears from the normal state of the wedge system of bogie swing suspension also play an important role among them. The purpose of the paper is to investigate the influence of different factors of the technical conditions of freight car running gears (size deviation in both the bearers and the wedge system during operation) on their basic indices – coefficients of horizontal and vertical dynamics, vehicle body acceleration, frame strength, and derailment stability coefficient. Methodology. The study was conducted by numerical integration and mathematical modeling of the freight car dynamic loading using the software package “Dynamics of Rail Vehicles” (“DYNRAIL”). Findings. As a result of the research for freight car dynamic coefficients determination taking into account technical conditions of the side bearers, the dependencies of the basic freight cars dynamic coefficients on the parameters of side bearers (the clearances in the side bearers and the wedge system conditions of the bogie swing suspension) considering running speed in the tangent and curved track sections of minor and mean radii were obtained. Originality. The impact of the technical condition of the car running gears on the traffic safety factors is determined. Practical value. The theoretical research results in determination of freight car dynamic indices taking into consideration the technical conditions of the side bearers of freight cars allow for an adequate assessment of effect of the freight car bogies’ technical conditions, namely the bearers parameters, on the railway traffic safety factors (coefficients of horizontal and vertical dynamics, vehicle body acceleration, frame strength and derailment stability coefficient).
Determination of Equivalent and Optimal Sizes of Wedge Tip from Flange for the Static Perforation of Soil
(Український державний університет залізничного транспорту, Харків, 2018) Posmitiukha, Oleksandr P.; Kravets, Svyatoslav V.; Suponyev, Volodymyr; Glavatsky, Kazimir Ts.
EN: Abstract. The purpose of the study is to create a new design of the working tip for the perforation of the soil when laying two or more buildings trenchless way and determine its rational parameters. Method. It is known that for static perforation in the formation of cavities in the soil for communication is traditionally used cone-shaped working elements, which is the most common, cheap and reliable. However, the study revealed inefficiency. The design of the working elements of the soil perforation for trenchless laying of two or more buildings simultaneously in the form of a tip, which consists of a wedge-shaped part and a control part in the form of a rectangle with half-cylinders. The basic principles and mathematical dependences of determining the size of the working body are described. Scientific novelty. Regularities of changes in soil pressure on the lateral, conical and wedge surface, flat and cylindrical part of the tip, allowed to obtain an analytical dependence for the calculation of the resistance force depending on the physical and mechanical properties of the soil, the diameter and the number of cases established simultaneously. Also, when comparing the cone-cylindrical and flat tips, it can be argued that the breakdown force of the flat tip decreases from 1.2 to 1.7 times.
Determination of Integrated Indicator for Analysis of the Traffic Safety Condition for Traction Rolling Stock
(Kaunas University of Technology, Kaunas, Lithuania, 2018) Bodnar, Borys Ye.; Bolzhelarskyi, Yaroslav V.; Ochkasov, Oleksandr B.; Hryshechkina, Tatyana S.
ENG: Traffic safety is a major priority in railway transport operation. Locomotive facility is one of the responsible units in general system of railways. A complex and cumbersome system of indicators is used in locomotive facilities to analyze the operation. The existing system makes it difficult to analyze the general level of work organization in the locomotive facilities. Purpose of the study is to determine the methodology of forming a certain dimensionless indicator (or group of indicators) that will reflect the general level of safety in the locomotive facilities. As the research methodology it was chosen principal component analysis as the corresponding mathematical apparatus, which makes it possible to analyze the existing indicators characterizing the performed work and the traffic safety condition with the necessary degree of informativity. As a result, the main components and the degree of their influence on the general level of traffic safety in the locomotive facilities are set. The indicators that have the most influence on the technical and safety components of the integrated indicator of traffic safety condition are determined. Originality of the work is that it for the first time proposes the concept of index of traffic safety condition and the method of its determination using the principal component analysis. Practical value of the work lies in the fact that the ranking of technical and safety components according to the degree of their influence on the general traffic safety index has been performed. Also, the locomotive units which have the greatest influence on the traffic safety condition and reliability were determined.