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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Item 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 ВладимировичRU: Статья посвящена десятилетию отечественной отрасли пассажирского вагоностроения. История, сегодняшний день, перспективы развития.Item 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.Item 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.Item 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, LarysaENG: 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.Item 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.Item 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.Item 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, AndreyEN: 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.Item 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 O.; 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.Item 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.Item 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.Item 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, LarysaEN: 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.Item 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 АнатолійовичUK: Наведений алгоритм вирішення контактної задачі силової взаємодії пари «колесо–рейка» у сучасній постановці з використанням детального математичного моделювання колеса і рейки методом скінченних елементів.Item The Calculation of Stress Intensity Factor Steel of Railway Wheels(Silesian University of Technology, Katowice, Poland, 2020) Vakulenko, Ihor O.; Proydak, Svetlana V.; Askerov, HangardasEN: 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.Item 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, JanENG: 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.Item 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.Item 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.Item 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, YuriyENG: 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.Item 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.Item Comparative Analysis of Options for Strengthening the Railway Subgrade with Vertical Elements(Printing House “Technologija”, Kaunas, Lithuania, 2021) Tiutkin, Oleksii L.; Keršys, Robertas; Neduzha, LarysaENG: 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.Item 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.