Browsing by Author "Shvets, Angela O."

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    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.
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    Dynamic Interaction of a Freight Car Body and a Three-Piece Bogie During Axle Load Increase
    (Taylor & Francis, England, 2021) Shvets, Angela O.
    UKR: The article presents the results of theoretical studies of interaction process of a freight car body with a three-piece bogie, which are aimed at solving the relevant problem of increasing the permissible speeds at railways with 1520 mm track gauge under conditions of linear load increase on the wheel set axle. The purpose of the research was to propose such an approach to the study of interaction processes between rolling stock and track, taking into account the interaction model of neighbouring carriages in trains, which will allow more correctly take into account the dynamics of rolling stock and increase traffic safety. The oscillation frequencies of the body, bogie and wheel set are analysed in order to establish a possible resonance phenomenon. The article examines the longitudinal and transverse forces of pseudo-sliding (creeping) arising between the climbing wheel of the front bogie and the rails. The conducted studies can contribute to the replacement of 18-100 bogies with modernised three-piece bogies while maintaining the main most metal-consuming elements of the 18-100 model implementing some modernisation units. The results obtained will make it possible to revise the permissible vehicle speeds with an increased axle load.
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    Influence of the Instability form on the Traffic Safety of Freight Rolling Stock
    (Mersin University Geomatics Engineering Department, Türkiye, 2023) Shvets, Angela O.
    ENG: The purpose of the paper is a theoretical study of the influence of longitudinal forces of a quasi-static nature and the instability form of freight wagons in a train on the wheel derailment stability. Knowledge of the laws of train movement under various control modes is necessary when programming the equations of train movement when it is necessary to determine the exact position of the train on the railway track and the stability of the wagons at the time of interest. As a result of theoretical studies, the values of the factor of stability against lift by longitudinal forces were obtained, taking into account the forms of instability. The relevance of this study relates to the need to control the longitudinal forces arising during the train movement, taking into account the increase in speeds, masses, and lengths of trains (especially freight trains) and the locomotive power increase.
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    Investigation of Coupling Strength at Non-Central Interaction of Railcars
    (Springer, US, 2022) Shvets, Angela O.
    ENG: The strength of the coupling device under the action of operating loads with regard to the non-central interaction of two cars is defined. When longitudinal force is transmitted through the coupler, the points of its possible rotation can be either the upper ribs of the shank end surface or the upper ribs of the damping device body support surface. The tail part of the coupler is under conditions of eccentric compression (or tension) by the force, which is non-parallel to the longitudinal axis. Through any cross-section of the shank, transverse and longitudinal forces are transmitted, applied at a point far from the center of gravity of the section. Using the principle of addition of forces action, a dependence for the definition of the maximum normal stresses in the extreme fibers of the analyzed section of the shank of the coupler, the most distant from the main axis of inertia, has been obtained. The damage to the area of the coupler shank jumper and the bending of the shank in the horizontal and vertical planes, which occur during operation, are justified. Calculation methods make it possible to study the influence of eccentricities of longitudinal force application relative to the coupler axis and the difference of coupler axis levels in the analyzed sections on the magnitude of the compressive operating loads. Application of the obtained results will not only help to ensure the strength of the coupling devices, but will also ensure the freight cars’ durability under conditions of increasing train weight and increasing train speed.
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    Predictive Model of Risks in Railroad Transport when Diagnosing Axle Boxes of Freight Wagons
    (SAGE Publishing, 2023) Muradian, Leontii A.; Pitsenko, Iryna; Shaposhnyk, Vladyslav Yu.; Shvets, Angela O.; Shvets, Anzhelika O.
    ENG: This article presents a mathematical model of the risk of failures, depending on the operating parameters, of locomotive diesel engines. The purpose of this study is to determine the risk of failures of locomotive diesel engines in maintenance. The theory of probability and the theory of logic and reliability are used in this theoretical study. The innovations and main works are the first approaches to calculating the risk of failures of locomotive diesel engines by hourly fuel consumption, which, under operational conditions, allows for extending the life of locomotive diesel engines during maintenance. As a result, a maintenance process for 5D49 diesel engines is developed in a locomotive depot. When managing the maintenance processes of 5D49 diesel engines in the locomotive depot, it is determined that the optimal mileage is 45,000 km. The resource of 5D49 diesel engines in the locomotive depot increased by 2.4% in the management of the maintenance process compared to the existing maintenance system.
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    Predictive Model of Risks in Railroad Transport when Diagnosing Axle Boxes of Freight Wagons (preiew)
    (SAGE Publishing, 2022) Muradian, Leontii A.; Pitsenko, Iryna; Shaposhnyk, Vladyslav Yu.; Shvets, Angela O.; Shvets, Anzhelika O.
    ENG: The research is aimed at developing a predictive model of the risks in railroad transport when using diagnostics of the axle boxes of freight wagons, which will allow assessing traffic safety during the operation of freight wagons. To develop a predictive model of the risks in railroad transport, the approaches of the probability theory were used. The constructed predictive model of the risks makes it possible to assess traffic safety during freight transportations; to determine further measures to reduce them; to evaluate the diagnostic method. The authors developed a predictive model of the risks in railroad transport when using the diagnostic methods of freight wagons’ axle boxes during maintenance and repair of axle box. This model includes the probability of failure-free operation of the axle boxes of freight wagons, the probability of identifying of the technical condition of the axle boxes of freight wagons, the significance of the diagnostic parameter and its relative assessment after appropriate maintenance, repair or technical control.
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    The Revised Method for Calculating of the Optimal Train Control Mode
    (Warsaw University of Technology, Poland, 2019) Zhelieznov, Konstantyn I.; Akulov, Artem S.; Zabolotniy, Oleksandr M.; Ursulyak, Lyudmila V.; Chabanuk, Evgenij V.; Shvets, Angela O.; Kuznetsov, Valeriy; Radkevych, Anatolii V.
    ENG: Development of a method for calculating the optimal mode of conducting a train in terms of energy saving meet the safety requirements and schedules. The method of calculation must solve the assigned tasks without significant time spent on the calculation. To implement this method of calculation was used a simplified model of the train as a controlled system. The existing mathematical and algorithmic methods for solving isoperimetric problems of finding the optimal solution in the presence of restrictions on resources were the information base for methodology development. Scientific works of domestic and foreign scientists, professional periodicals, materials of scientific and practical conferences, methodical and normative materials, currently in force on Ukrainian Railways. The results of these studies were used to create simulators on the basis of computer technology for the training of locomotive drivers. The scientific novelty of the proposed calculation method consists in applying the simplified calculations of the status of the train as a controlled system, without the use of differential equations of motion that allows to significantly increase the speed of the calculations. This, in turn, will solve the problems of finding optimal control in real time, taking into account changing conditions during the movement of the train. The practical significance of the obtained results is the use of such a calculation method that does not require significant time for its implementation and can be used as a subsystem of the on-board train control system capable of per-forming calculations taking into account changes in the current train situation.
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    Simulator for Training Mining Locomotive Drivers
    (University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, 2022) Аkulov, Artem S.; Zhelieznov, Konstantine I.; Zabolotnyi, Oleksandr M.; Chabaniuk, Eugene V.; Shvets, Angela O.
    ENG: Training of mining locomotive drivers using simulators will increase the efficiency and intensity of training. Due to this, a decrease in financial and time expenditures for training a driver, an increase in the safety and productivity of his labour will be achieved. The number of errors in the work and damage to equipment, which are sometimes caused by the driver's inexperience will be reduced. The mining train driver's simulator is manufactured as an autonomous training tool with the trainee immersion in a virtual environment that is as close as possible to a real working environment and is a training complex consisting of hardware and software. The software simulates the operation of all locomotive systems, mining sidings infrastructure and an interactive 3D panorama of the environment. In the driver's cabin of a mining locomotive, a real working environment is reproduced, control, alarm and indication elements of the locomotive, as well as other equipment of a real cabin necessary for performing all technological operations are located. Training complexes will never replace real experience in the workplace, but they can quickly increase the qualifications of trainees, develop in them the skills of acting in non-standard and emergency situations, which is extremely difficult in real work conditions.
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    Transversal Displacement of Freight Wagons Bogies
    (Published by AIP Publishing, 2019) Fomin, Oleksij V.; Shvets, Angela O.; Hauser, Vladimír; Prokopenko, Pavlo
    EN: This paper is focused to the study of the influence of lateral displacement of open box type cargo wagon bogies on their main dynamic indicators and indicators of the interaction of rolling stock with rails. The theoretical study was carried out using the model of spatial oscillations of the five wagons set. During the calculations, the change in the angle of rotation of the central axis of the wagon body was considered, which leads to a mutual transverse displacement of the bogies. As a result of research, the dependences of the indicated indicators of a freight wagon on the magnitude of the angle of rotation of the body and speed of movement were obtained.