Browsing by Author "Neduzha, Larysa O."

Now showing 1 - 40 of 41

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.
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.
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.
Conceptual Basis of Adaptation of a Field-Oriented Control System for Traction Induction Motors to the Operating Parameters of a Locomotive
(MDPI, 2026) Lukoševičius, Vaidas; Goolak, Sergey O.; Derehuz, Ihor; Neduzha, Larysa O.; Keršys, Artūras; Dzerkelis, Vytautas
ENG: Field-oriented control (FOC) of induction motors (IMs) is used in railway rolling stock. In such control systems, a fixed frequency of the pulse-width modulation (PWM) inverter is used, which leads to an increase in power losses in the traction drive. To optimize power losses in the locomotive traction drive system, it is proposed to adapt the number of PWM inverter pulses to the frequency of the FOC speed controller, which is proportional to the locomotive speed. To solve this problem, conceptual foundations for adapting FOC to the locomotive speed have been developed, the key aspects of which are algorithms for adapting the PWM inverter frequency, the controller parameters and the parameters of the FOC speed controller frequency filters. The most significant results of the work are the methods for adjusting the maximum of the controllers of the basic FOC IM system, the filter structure and the inverter control scheme, adapted to the locomotive speed. The modeling results have shown the effectiveness of the proposed technical solutions. The proposed approach to developing FOC will allow minimizing the consumption of energy resources by the locomotive in the entire range of changes in its speed.
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.
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).
Dynamic Track Irregularities Modeling when Studying Rolling Stock Dynamics
(Kaunas Univ. of Technology, Lithuania, 2019) Bondarenko, Iryna O.; Lunys, O.; Neduzha, Larysa O.; Keršys, Robertas
ENG: Abstract The main purpose of this work is to study the process of transferring forces in the interaction of the rolling stock and the railway track in time. It was considered the wheel set movement on a straight track section without taking into account the rolling stock movements in the horizontal plane caused by the wheel conicity. And it was obtained the dynamic track irregularities depending on the rolling stock speed in the cross section of the railway track when a single force passes over it. Using the wave properties during the force propagation in the trackform elements is allowed to determine the time response of the elements to the force action. First, it allowed to take into account the influence of the state of the trackform elements on the work of the trackform itself and to obtain dynamic track irregularities that take into account both the length inhomogeneity and the depth anisotropy of the trackform. Secondly, it allowed to determine the change in strain in the trackform elements in time.
Enhancement of Operational Reliability of Elements in the Diesel Engine Cooling System of Locomotives
(Kaunas Univ. of Technology, Lithuania, 2020) Zelenko, Yuliia V.; Keršys, A.; Neduzha, Larysa O.
EN: Operating experience of diesel locomotives on railways shows that the use of insufficiently purified water results in the destruction of water cooling systems. This problem is especially acute for areas with increased hardness and mineralization of natural waters. The impact of the water demineralization degree on the corrosion rate of elements in diesel engine cooling systems of locomotives has been researched. The dependence of the corrosion rate for various metals on the degree and depth of desalination and the cooling liquid temperature is proved. Recommendations on optimizing the technology of cation treatment for cooling liquids ensuring the efficiency and durability in the operation of diesel engines of locomotives were developed.
Enhancing the Scientific Level of Engineering Training of Railway Transport Professionals
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2017) Kalivoda, Jan; Neduzha, Larysa O.
EN: Purpose. Publication of the results of international scientific and technical cooperation of the Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan (DNURT, Ukraine) and the Czech Technical University (CTU) in the field of engineering training of students on the basis of modern methods of development of scientific and creative abilities of students. Methodology. The development of scientific thought and the improvement of the professional level of students of engineering specialties of railway technical institutes may be carried out by different methods both during training and during extracurricular time. One of the methods for improving the scientific level of future engineers is the public lectures of renowned scholars and researchers from leading European higher education institutions, enabling students to have access to world-class advanced scientific idea. Findings. The authors have analyzed the activity of DNURT and CTU on scientific and educational preparation of students. It is emphasized that cooperation promotes strengthening of contacts between universities, improves the quality of students' training, is one of the factors of the professional development of future specialists, raising the scientific level of engineering training of railway transport professionals. It is proved that DNURT and CTU duly fulfill the higher education tasks of training of professional personnel who are able to work effectively in the global market, aimed at improving the quality and efficiency of education. Originality. This paper presents the analysis of results concerning the efficiency of application of modern methods for engineering training of students of technical higher educational institutions. It gives extended view of the main directions of international education activities. Practical value. It is confirmed that popularization of modern methods of propagation of engineering thought among student youth has acquired a new meaning and contributes to enhancing the scientific level of engineering training of railway transport professionals.
Estimation of Dynamic Qualities of Freight Wagons on Bogies of a Perspective Model
(Silesian University of Technology, Poland, 2017) Myamlin, Sergej V.; Neduzha, Larysa O.; Lunys, Olegas
EN: The work provides an analysis of the impact of bogies of different construction on the main dynamic indicators of movement safety of freight wagons, in the present case, of gondola wagons: coefficient of vertical dynamics of a body frame (Кd), coefficient of vertical dynamics of the unsprung bogie frame (Кdu), relation of the frame force to the static axial load (Nf/Pa), coefficient of the stability reserve against derailment (Кs) [5, 8-11, 15, 17]. Scientific novelty includes the experimentally obtained dependences of the main dynamic indicators of motion of gondola wagons with the use of Model 18-9771 bogies, having different variants of bearers, this giving an opportunity for choice of bearer parameters for receiving the highest effect as regards the reduction of dynamic loading both of the wagon and the track. Of practical value are technical decisions concerning fastening of the bearers to the bolster beam, which are under protection of the patent for invention [18, 20], and stiffness parameters of bogie bearers.
Experimental Research of Dynamic Qualities of Freight Cars with Bogies of Different Designs
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2014) Myamlin, Serhiy V.; Ten, Oleksandr O.; Neduzha, Larysa O.
EN: Purpose. With the advent of new designs of freright cars the task of designing the more modern bogies, assessment of their dynamic properties depending on the type and structure of pecularities, accounting the axle loadings, providing the dynamic and running characteristics, meeting the conditions of impact on the track, stability, and frame forces intensity etc. becomes especially important. In order to launch the new production into manufacture and to assess the dynamic properties using different designs of bogies the running testes were conducted. They allowed one to compare the dynamic performance of the new bogie with the existing models. Methodology. The study was conducted using the method of numerical integration and mathematical modeling of dynamic loading of freight cars using the software package «Dynamics of Rail Vehicles» («DYNRAIL»). Findings. The results of studies of dynamic characteristics of open cars with new and worn wheels of bogie models 18-9771, 18-9770 and 18-578 in graphical and tabular form are presented. All figures are within the normative values and do not exceed the maximum admissible ones. Originality. When designing the bogie for loading 23.5 t/axle almost all available technical solutions to improve the characteristics of the freight car bogies (elastic bearers, cassette bearing in axle boxes, axle boxe adapter of original design, bilinear central spring suspension, etc.) were used. Practical value. As a result of the engineering works on projecting and manufacturing of the improved designs of freight car bogies a new design was received. It is highly competitive with the dynamic qualities of the best ones. Made choice of rational values of elastic-dissipative parameters of the bogie allows one to create standard series of running gears for freight cars for promising operating conditions. The results are of practical importance. They have found reflection in the number of author’s publications in special and semi-popular editions.
Finite-Element Analysis of Strengthening the Subgrade on the Basis of Boring and Mixing Technology
(The Silesian University of Technology, 2021) Tiutkin, Oleksii L.; Neduzha, Larysa O.; Kalivoda, Jan
ENG: One of the effective techniques to strengthen the subgrade is boring and mixing technology, which is based on the immersion of vertical elements – piles into the subgrade. This method of strengthening significantly affects the stress state of the track superstructure. Two options of the placement of strengthening elements are examined in this paper. To determine the influence of position of strengthening elements on the stress state of the track superstructure, appropriate finite-element models were created. The models fully reflect the geometric and deformation characteristics of a real subgrade, which is strengthened by piles. The calculated stress state of the track superstructure is shown and analyzed in this paper. The main contribution of the paper lies in optimization of the geometric parameters of the technology to reduce the stress state of the "track superstructure–subgrade–soil basement" system. The results show that the location of piles near the rails is more effective than the location of piles near the ballast section.
High Speed Stability of a Railway Vehicle Equipped with Independently Rotating Wheels
(Ústav Teoretické a Aplikované Mechaniky, Prosecká, Czech Republic, 2018) Kyryl’chuk, Oleg A.; Kalivoda, Jan; Neduzha, Larysa O.
EN: The paper is devoted to the study of lateral oscillation and the assessment of the motion stability of a four axle railway vehicle equipped with wheelsets with independently rotating wheels. First, a linear four degrees of freedom mathematical model of the unconstrained wheelset in a straight track has been built. The wheelset model was consequently utilized in a model of the whole vehicle representing typical railway passenger car. The model has 25 degrees of freedom and it is described by a system of 50 first order homogeneous differential equations. Linear algebra methods were used to assess the stability. The influence of a running velocity, the torsional stiffness of wheelsets and the viscosity of coupling element between wheels was studied. Results of this study shows that wheelsets with independently rotating wheels and viscous coupling element enable stable behaviour of a vehicle at speeds exceeding 500 km/h. Prospectively, this type of wheelset is applicable to high-speed railway vehicles, because it offers either further increase of running speeds or simplification of running gear while preserving high speed stability.
High Speed Stability of a Railway Vehicle Equipped with Independently Rotating Wheels (preprint)
(Ústav Teoretické a Aplikované Mechaniky, Prosecká, Czech Republic, 2018) Kyryl’chuk, Oleg A.; Kalivoda, Jan; Neduzha, Larysa O.
EN: The paper is devoted to the study of lateral oscillation and the assessment of the motion stability of a four axle railway vehicle equipped with wheelsets with independently rotating wheels. First, a linear four degrees of freedom mathematical model of the unconstrained wheelset in a straight track has been built. The wheelset model was consequently utilized in a model of the whole vehicle representing typical railway passenger car. The model has 25 degrees of freedom and it is described by a system of 50 first order homogeneous differential equations. Linear algebra methods were used to assess the stability. The influence of a running velocity, the torsional stiffness of wheelsets and the viscosity of coupling element between wheels was studied. Results of this study shows that wheelsets with independently rotating wheels and viscous coupling element enable stable behaviour of a vehicle at speeds exceeding 500 km/h. Prospectively, this type of wheelset is applicable to high-speed railway vehicles, because it offers either further increase of running speeds or simplification of running gear while preserving high speed stability.
Hybrid Optimization of Hardfacing Conditions and the Content of Exothermic Additions in the Core Filler During the Flux-Cored Arc Welding Process
(MDPI, 2026) Trembach, Bohdan O.; Dmitriiev, Oleh; Kulahin, Kostiantyn; Balenko, Oleksii; Maliuha, Volodymyr; Neduzha, Larysa O.
ENG: This study introduces a hybrid optimization method to enhance the melting characteristics and weld bead morphology of flux-cored wire hardfacing with exothermic addition into the core filler. The Taguchi Design of Experiments (L9 orthogonal array) was used to analyze the effects of key conditions on multiple melting characteristics. The hybrid Taguchi-GRA-PCA effectively identified the best parameter combination, resulting in a significant improvement in overall melting performance. The impact of welding modes on weld bead parameters and melting characteristics was examined. It was determined that the optimal amount of the exothermic addition CuO-Al introduced into the flux-cored wire filler should be a medium level (EA = 28 wt.%). Results showed that wire feed speed WFS and EA had the greatest effect on MOR and DR, while EA and CTWD mainly influenced SF and De. It has been determined that the content of the exothermic additive has a significant impact on the melting process of filler materials, affecting the melting characteristics and weld bead morphology. It has been found that the melting characteristics of deposition rate and spattering factor can be used to optimize welding modes and characterize most output parameters of the welding/surfacing process.
The Impact of Motor Oils Quality on Improving the Reliability in Operation of Traction Rolling Stock
(Kaunas Univ. of Technology, Lithuania, 2020) Zelenko, Yuliia V.; Bezovska, Maryna S.; Skvireckas, R.; Neduzha, Larysa O.
EN: In modern operating conditions of rolling stock, railway safety is one of the priority issues. The safe operation of traction rolling stock is impossible without the effective use of all its components. One of the main characteristics of rolling stock is the reliability, the level of which is associated with the efficiency of its operation. The reliability is closely related to such an important issue as the environmental safety in operating of a railway vehicle. Domestic and world experience in operating autonomous locomotives indicates that diesel power plants play a decisive role in this. An important part of diesel engine in a locomotive is the oil system. The annual formation of a significant amount of used oils requires solving the problem of their further safe storage. The article considers the impact of motor oils quality on the reliability in operation of traction rolling stock. In this connection, a new method in recovering of used oils of different marks and returning them to the production process is proposed. This will contribute to increasing the safety in operation of railway equipment on the railways, improved economic performance, minimizing the amount of waste and their negative effect on the environment and so on.
Improving the Dependability Evaluation Technique of a Transport Vehicle
(Kaunas Univ. of Technology, Lithuania, 2020) Babyak, Mykola O.; Neduzha, Larysa O.; Keršys, Robertas
EN: The safety of vehicles depends on the dependabiliti of its elements, which should guarantee the trouble-free operation throughout the entire service life. The concepts of "safety" and "dependabiliti" for the vehicle are inseparable. Therefore, all structural components throughout the entire service life before the onset of the limit state must guarantee trouble-free operation of rolling stock with the installed system of maintenance and repair, i.e. be in working condition as long as possible and perform all necessary functions. Regarding the relevance in predicting the technical condition of a vehicle, authors present improving the dependabiliti evaluation technique of its facility by the value of a safety factor. The impact of actual operating conditions of rolling stock on durability and operability (on the example of a pantograph) is taken into account. The nearest relation between the dependabilitiof a structure and a safety factor and parameters of probability distributions of stresses is determined. Improving the technique can be used to evaluate the dependabiliti of the facility from the viewpoint in the individual prediction of operability and life of the structural elements for the vehicle based on observations over the process of their wear. This will increase the safety and dependabilitiof operation for all complex structures.
Influence of Atmospheric Humidity on the Critical Buckling Load of Reinforced Concrete Columns
(World Scientific, 2021) Magalhães, Kaique Moreira Matos; Brasil, Reyolando Manoel Lopes Rebello da Fonseca; Wahrhaftig, Alexandre de Macêdo; Siqueira, Gustavo Henrique; Bondarenko, Iryna O.; Neduzha, Larysa O.
ENG: In this paper, an evaluation of the influence of atmospheric humidity on the critical buckling load of reinforced concrete columns is performed. A particular case consisting of a real, extremely slender reinforced concrete pole was taken for the study. The chosen mathematical procedure for calculating the critical load is based on the Mechanics of Deformable Solids due to variations of structure vibration frequency over time. The rheological behavior of concrete related to creep and shrinkage, which illustrates the time-dependent aspect of the problem, was also considered in the analysis following normative recommendations from the Brazilian Association of Technical Standards (ABNT). In order to evaluate value changes of critical buckling loads, different time instants after loading the structure as well as different relative humidity from 0% to 100%, in 10% increments were considered. According to the selected criteria, it was possible to verify that a higher atmospheric humidity decreases the water transport from the interior out to the exterior surfaces of concrete, hence positively influencing structure stiffness. Therefore, the lowest reduction on critical buckling was 41.9% at 100% relative atmospheric humidity, versus the highest 60.7% at 0% relative humidity. A period of 7500 days after loading the structure was considered in the analysis.
Influence of Frequency Characteristics of the Locomotive on Rational Values of Parameters of Its Vehicular Part
(Georgian Technical University, Tbilisi, Georgia, 2016) Pshin'ko, Oleksandr M.; Myamlin, Serhiy V.; Neduzha, Larysa O.
EN: Ukraine rail freight turnover for more than 3/4 is provided by electric traction. Therefore, the efficiency of railway transportation is largely determined by a sufficient amount and reliability of electric locomotives fleet. One of the main directions in this problems solving is to increase of Ukraine railway transport efficiency is to equip it by quite powerful, reliable and economical locomotives with good dynamic properties. In order to determine the basic indicators that affect on the rational value of its vehicular part 's parameters, as well as on the capacity for work and the physiological condition of the locomotive crew, was carried out a frequency analysis of the elements of the locomotive design. For this stage of the research were compiled simultaneous differential equations due that were identified own resonant frequencies of oscillations of components of electric locomotive. The practical value of the whole complex of theoretical research is to develop an algorithm and program, selection of rational parameters and design scheme of the locomotive undercarriage. Carried further dynamic performance trials have shown that the calculation data obtained with the application of theoretical studies, fairly well correspond to the results of tests, which indicates on a good selection of the constructive scheme of vehicular parts.
Influence of Parameters of Electric Locomotive on its Critical Speed
(Springer, Cham, 2020) Klimenko, Irina V.; Kalivoda, Jan; Neduzha, Larysa O.
EN: Abstract. A high speed is one of the most important todays requirements for the rail transport. However, increasing the maximum speed brings also the problem of a vehicle stability. The parameters of the vehicle suspension should be tuned in order to achieve vehicle stability in the entire speed range. The article presents the results of theoretical study of the impact of the suspension parameters of the mainline electric locomotive type DS3 on the magnitude of its critical speed. The stability and critical speed are assessed by eigenvalues calculation of the linear model of the vehicle. The study compares 9 variants of vehicle parameters. The sensitivity of the critical speed on the individual parameters is shown and discussed. At the same time, it is shown that by tuning vehicle parameters in order to achieve high critical speed, some other vehicle characteristics may deteriorate. As the result, the optimal range of the stiffness values of the connection of axle-boxes and bogie-frame is recommended.
Investigation of the Influence of the Rolling Stock Dynamics on the Intensity of Using the Railway Track Elements
(Дніпровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2019) Bondarenko, Iryna O.; Neduzha, Larysa O.
ENG: Purpose. The main purpose of this work is to research deformability parameters of the railway track under various operating conditions as the initial data for the formation of forced oscillations of rolling stock and the trackform use intensity. Methodology. For the research, an original model of the trackform, described with using the basic concepts of the theory of elasticity and the propagation of elastic waves was developed. Findings. It has been established that the ratio between the intensity of work of elements and the trackform, as criteria for deformability, can be used as the estimated parameters of the functionally safe operation of the track. It can be the basis for the classification of critical track states under which it had to perform work to restore its working capacity in order to ensure the required level of efficiency of use construction during the service life. Originality. Trackform and parameters of the elements of the track superstructure and substructure can be described using the railway tracks deformability behaviour. In the future this conclusion will help to increase the efficiency of the dynamic properties of rolling stock when designing and maintain in readiness the infrastructure while in operation. Practical value. Changes in the regulatory framework of rail transport in recent years provide for the observance of its functional safety, therefore, the question of the need to assess the impact of rolling stock on the way to be regarded as a dynamic process with consideration to the deformability resistance track. This research provides a basis for record of the stiffness of deformation that allows creating the regulatory framework for the functional safety of the railway track in Ukraine.
Mathematical Modeling of a Cargo Locomotive
(2012) Myamlin, Serhiy V.; Dailydka, Stasys; Neduzha, Larysa O.
EN: Actuality and explanation of development of six-axle mainline locomotive ER20CF for Lithuania Railways are done. For carrying out of theoretical researches with purpose of providing safety movement, strength of constructions elements, improved dynamical characteristics, was examined some aspects of mathematical simulation of dimensional hunting of freight locomotive.
Mathematical Modeling of Dynamic Loading of Cassette Bearings for Freight Cars
(Kaunas University of Technology; Publishing House “Technologija“, Kaunas, Lithuania, 2017) Myamlin, Sergey V.; Lunys, Olegas; Neduzha, Larysa O.; Kyryl’chuk, Oleg A.
EN: The article deals with the solution of the contact problem of load car axle-box cassette bearings. A model of finite elements of axle-box tensely deformed state is presented. The problem has been solved by the combination of the finite elements method and the generalized power method. Due to the results, we can define mechanical properties.
Mathematical Simulation of Spatial Oscillations of the "Underframe-Track" System Interaction
(Kaunas University of Technology, Kaunas, Lithuania, 2018) Klimenko, Irina V.; Černiauskaitė, L.; Neduzha, Larysa O.; Ochkasov, Oleksandr B.
ENG: The article presents mathematical simulation of spatial oscillations of the "underframe-track" system interaction. It describes a design scheme of the freight-passenger electric locomotive, taking into account details of construction and the mathematical model of its spatial oscillations. The connections imposed on the system, the forces arising in them, as well as the mutual displacements of all the bodies in the system are considered. Differential equations of system oscillations are composed on the basis of Lagrange's equations of the second kind taking into account details of construction of the electric locomotive. The paper presents some results of calculations for the cases of an electric locomotive movement on the straight sections of the track, curves of small and mean radius.
Optimisation of Elemental Transfer Efficiency in Fe-C-Cr-Ti-Cu Hardfacing by Self-Shielded Flux-Cored Wire: A Synergistic Taguchi–ANOVA–FD–PCA–GRA Approach
(MDPI, 2026) Trembach, Bohdan O.; Krbat'a, Michal; Haibadulov, Borys; Iokhov, Oleksandr; Tsebriuk, Ivan; Pomohaiev, Ihor; Korobkov, Yurii; Neduzha, Larysa O.
ENG: The objective of this article is to optimise the deposition modes and the content of exothermic additions (EAs) in the core filler in Fe-C-Cr-Ti with Cu additions hardfacing. To achieve this, JMatPro Release 7.0, Sente Software Ltd., 2016 material characterisation software was used to simulate and calculate the equilibrium phase structure and composition of the Fe-C-Cr-Ti-Cu alloy during the welding thermal cycle. A synergistic approach combining the Taguchi–Analysis of Variance (ANOVA)–Factorial design (FD) method with the standard hybrid Taguchi–ANOVA–Principal Component Analysis (PCA)–Grey Relational Analysis (GRA) is used and justified to optimise factors and develop mathematical models for parameters in the L9 orthogonal experimental design. The study examines how the transfers of deoxidisers depend on the content of exothermic additions in the cored wire filler (EA) and the contact tip-to-work distance (CTWD), while the behaviour of carbide formers is influenced by wire feed speed (WFS) and present arc voltage at the power source (Uset). The research specifically investigates the Fe-C-Cr-Ti-Cu system and the role of copper in stabilising austenite. Findings show that high Cu concentrations (7 wt.%) enhance hardenability by 13%, effectively suppressing pearlite transformation and expanding the bainite region. The desired chemical composition of the deposited metal is determined by the distribution of selected factors, as measured by the transfer coefficients of each element.
Parameter Optimization of the Locomotive Running Gear
(Kaunas University of Technology, Kaunas, Lithuania, 2018) Klimenko, Irina V.; Kalivoda, Jan; Neduzha, Larysa O.
EN: In principle all railway vehicles exhibit lateral oscillations, also called a hunting motion. Stability of hunting motion usually decreases with increasing running velocity and the speed at which hunting motion becomes unstable limits the maximal permissible speed of railway vehicle. When designing a new rolling stock, it is necessary to tune the parameters of a vehicle suspension so that the critical velocity is higher than the maximum operational vehicle speed. In the paper the Nelder-Mead optimization is proposed as the method useful for finding the optimal vehicle parameters at which the maximum critical velocity is reached. This optimization method was applied to the locomotive DS3. The results are presented and discussed in the paper.
Pollutant Emissions in Ports: A Comprehensive Review
(MDPI, 2021) Barberi, Salvatore; Sambito, Mariacrocetta; Neduzha, Larysa O.; Severino, Alessandro
EN: In recent decades, maritime transport demand has increased along with world population and global trades. This is associated with higher pollution levels, including the emissions of GHG and other polluting gases. Ports are important elements within maritime transport and contribute themselves to pollutant emissions. This paper aims to offer a comprehensive yet technical review of the latest related technologies, explaining and covering aspects that link ports with emissions, i.e., analyzing, monitoring, assessing, and mitigating emissions in ports. This has been achieved through a robust scientific analysis of very recent and significant research studies, to offer an up-to-date and reliable overview. Results show the correlation between emissions and port infrastructures, and demonstrate how proper interventions can help with reducing pollutant emissions and financial costs as well, in ports and for maritime transportation in general. Besides, this review also wishes to propose new ideas for future research: new future experimental studies might spin-off from it, and perhaps port Authorities might be inspired to experiment and implement dedicated technologies to improve their impact on environment and sustainability.
Rationale for New Pontoon-Cable Bridge Structure Parameters for Providing Uninterrupted Transportation
(University of Padua, 2025) Ovchynnykov, Pavlo A.; Tiutkin, Oleksii L.; Lukoševičius, Vaidas; Neduzha, Larysa O.
ENG: A novel type of pontoon bridge was proposed, characterized by fully submerged pontoons, creating excessive buoyant forces, and overdeck cable intended for keeping them from surfacing. Various scheme configurations were calculated using FEM to determine structure's behaviour and substantiate its parameters. Result show increased rigidity, when compared to traditional floating bridges, which translates into improved passenger comfort and overall usability.
Research of Friction Indices Influence on the Freight Car Dynamics
(Polish Academy of Sciences Branch in Lublin, Lublin, Poland, 2013) Myamlin, Sergey V.; Neduzha, Larysa O.; Ten, Alexander A.; Shvets, Angela A.
EN: The work is devoted to study of friction indices influence in the "body – bogie" system in freight cars (the change of the friction coefficient in the side bearers during operation) on their basic indices – the coefficients of the horizontal and vertical dynamics, vehicle body acceleration, frame strength, and derailment stability coefficient. The study was conducted by mathematical modeling of the freight car dynamic loading using the software package «DYNRAIL». The focus was mainly concentrated on the influence of the friction force change between the body and bogies. Theoretical studies of dynamic loading of the freight open cars were conducted in both the empty and loaded conditions with the bogies model 18–100 during motion in the tangent and curved railway sections with different radii and the established motion speeds. In this case, the basic dynamic parameters of the freight car were calculated. The theoretical research results in determination of freight car dynamic indices taking into consideration the friction coefficients in the system “body – bogie” allow for an adequate assessment of the friction coefficient between the freight car bearers parameters, on the railway traffic safety factors (coefficients of dynamics, vehicle body acceleration, frame strength and derailment stability coefficient).
Research of Innovations of Diesel Locomotives and Bogies
(Vilnius, Lithuania, 2016) Myamlin, Serhiy V.; Neduzha, Larysa O.; Urbutis, Žilvinas
EN: During manufacturing of diesel locomotives, their basic parameters must be adapted to the requirements of that specific environment. One of the central issues is the choice of bogies. The article present the examples of selecting a bogie by using multi-criteria optimization methods. The methods are adapted for Siemens bogies models SF1, SF2, SF3 and SF6. The solutions obtained by different methods were compared, and shortcomings of certain multi-criteria optimization methods for selection of a bogie model according to its parameters were established.
Research of Locomotive Mechanics Behavior
(Дніпропетровський національний університет залізничного транспорту ім. акад. В. Лазаряна, Дніпро, 2018) Tatarinоvа, Valentyna А.; Kаlіvоdа, Jan; Neduzha, Larysa O.
EN: Purpose. The main purpose of the study is to compare and confirm the results of theoretical studies of locomotive motion along the straight and curved track sections in the set range of operating speeds, which is essential for determining their dynamic qualities. The conducted research complex is one of the prerequisites for improving the reliability of the rolling stock mechanics, in particular the bogie parameters. Methodology. The research was carried out by numerical integration of the dynamic loading of a railway vehicle using one of the modern software complexes. In this study we used the mathematical model of locomotive spatial oscillations obtained using Lagrangian equations of the second kind. Findings. Authors carried out theoretical research and performed the analysis of the vehicle behavior during the motion along the track section, which in the vertical plane has no geometric defects, and taking into account the inequalities on the example of the main locomotive. The researches were carried out both analytically and with the help of the modern software complex. Comparison of the graphs shows that the results obtained by different methods coincide with sufficient accuracy. Originality. Based on the results of many years of work, the authors present the General Classification of Locomotive Mechanics, which may be useful to researchers, who are involved in the assessment of the dynamic qualities of new and upgraded types of rolling stock. Practical value. A new licensed modern software complex has been applied, which makes it possible to use it in the design, modeling of units of rolling stock and their elements; during theoretical and experimental studies, comparison of their results. The results of theoretical research can be taken into account for the preliminary research during creating the reliable constructions of a new vehicle, further improvement of the mechanics, modernization of the existing units of rolling stock during field tests.
Research of the Strained State in the "Subgrade – Base" System at the Variation of Deformation Parameters
(Kaunas Univ. of Technology, Lithuania, 2020) Tiutkin, Oleksii L.; Keršys, Robertas; Neduzha, Larysa O.
ENG: When building the railway lines, there are several cases of the subgrade construction, which in the future is the cause of poor operation. It lies in the fact that "diseases": defects and deformations emerge in the subgrade and the base on which it is built. These phenomena are due to the fact that, firstly, the quality of the subgrade is not consistent with the normative deformation parameters, and secondly, the soil foundation of the subgrade is weak. The purpose of this research is to obtain the strained state of the "subgrade – base" system at the variation of the deformation parameters of its elements. For this, finite-element models were developed, in which the track superstructure with assembled rails and sleepers, the subgrade and its base were reproduced. Numerical analysis was carried out in the static position on trainloads. The obtained results of the strained state of the models are components of horizontal and vertical displacements. The results of the research show that the impact of the base with lower deformation parameters is greater than in the subgrade with a reduced, unlike regulatory, the elastic modulus.
Roles and functions of asphalt sub-ballast in the modern maintenance of the European railways
(Tongji University and Tongji University Press, 2025) La Placa, A.; Autelitano, F.; Neduzha, Larysa O.; Tiutkin, Oleksii L.; Giuliani, F.
ENG: The railway network is increasingly becoming central to the socio-economic development and the decarbonisation of transport, supporting its growth in compliance with the emission reduction targets set by the 2050 European Green Deal. Thus, several programmes for the major network renewals and the construction of safe, resilient and efficient high-speed lines have been implemented. In this scenario, some construction solutions have been introduced to enhance the durability and functionality of the railway infrastructure, particularly for the ballasted track one. Among these design techniques, the asphalt or bituminous sub-ballast has emerged as a proven technology capable of improving the railway performance and durability. Derived from the road construction approach, asphalt sub-ballast has been used in the European high-speed and high-capacity lines since the 1970s, providing both structural and functional benefits. This article offers a critical review of the current knowledge on the asphalt sub-ballast applications, highlighting its technical characteristics and long-term performances. Functional, structural and economic advantages have been assessed and analysed based on laboratory scale and on-field experiences. Experimental data indeed confirm the effectiveness of asphalt sub-ballast in improving the track stability and load distribution, in providing better water drainage and in reducing fatigue induced phenomena. These enhanced properties lead to lower maintenance costs and operations, particularly those related to ballast tamping, as well as to an extended service life of the whole infrastructure. From the circular economy perspective, the re-use or recycle of wastes and by-products in these mixes amplifies the cost-benefit ratio, also improving their sustainability.
Routes Planning Models for Railway Transport Systems in Relation to Passengers’ Demand
(MDPI, 2021) Severino, Alessandro; Martseniuk, Larysa V.; Curto, Salvatore; Neduzha, Larysa O.
ENG: Nowadays, transport systems efficiency plays a key role for communities’ liveability and economy, being in addition an important factor in the economic integration of countries. The purpose of the article is to develop multi-stage models of tourist activities for optimizing the development of operating companies. For the implementation of models, the authors evolved the relevant system of organizational-functional support for the development of railway tourism. The research will enable us to take into consideration risks when planning tourist routes by railway, determine the order of construction or start of routes, and assess their profitability. This will provide to earn the expected incomes of all interested parties in tourist activities for the specified period. The authors created economic-mathematical models of the discrete optimal planning of the railway tourism operations. This takes into account conditions of risks and cooperation, and allows to determine which sets of effective routes are the most profitable ones. The results of the realization of the developed models include the task of the succession of the tourist route introduction according to the present and future infrastructure, availability of the rolling stock, etc. In this, consideration is given to obtaining maximum profit from tourism businesses for every participant during an established period.
Simulation of Safety Against Derailment Tests of an Electric Locomotive
(Ústav Teoretické a Aplikované Mechaniky, Prosecká, Czech Republic, 2019) Kalivoda, Jan; Neduzha, Larysa O.
EN: Abstract: European standards define the conditions for stationary and track tests that each new type of rolling stock has to pass within its approval process. Because those tests are demanding and their results are influenced by weather conditions and other random factors, there is an attempt to replace them by computer simulations. The paper deals with simulations of stationary tests for proving safety against derailment. The multibody simulation model of Ukrainian electric locomotive DS3 has been built. This model was used to simulate all three methods defined in the European standard EN 14363 for proving safety against derailment. The results of the simulations are shown in the paper.
Spatial Vibration of Cargo Cars in Computer Modelling with the Account of Their Inertia Properties
(Kaunas University of Technology, Kaunas, 2010) Myamlin, Serhiy V.; Ten, Oleksandr O.; Neduzha, Larysa O.; Shvets, Anzhela O.
EN: The papers describes some methods for more exact computation of the freight wagon's inertial characteristics, that is necessary for performing more exact computer simulation of the railway vehicle dynamics. Comparison of the simulation results with the test data shows the appropriate coincidence between them that confirms the mathematical model's adequacy.
Stability Research of the Main-Line Locomotive Movement
(Kaunas Univ. of Technology, Lithuania, 2019) Lunys, O.; Neduzha, Larysa O.; Tatarinоvа, Valentyna А.
EN: Abstract To ensure an increase in the design speed with simultaneous improvement of the traction, braking and dynamic qualities of the rolling stock, to increase the level of traffic safety and reduce accident rates the main-line locomotive was considered. A complex of theoretical research of free oscillations, factoring in viscous friction and forced oscillations, was carried out. When considering forced oscillations, the irregularity of a railway track in the vertical direction, due to the rail joints, was taken into account. Graphs of changes in the vertical movements of a body and a bogie were obtained both analytically and using a software package. The results of theoretical research correlate with the experimental data, which allows at the first stages of designing the new rolling stock units (according to the authors) to significantly reduce the cost for field tests.
A Systematic Review of the Hydrological, Environmental and Durability Performance of Permeable Pavement Systems
(MDPI, 2021) Sambito, Mariacrocetta; Severino, Alessandro; Freni, Gabriele; Neduzha, Larysa O.
EN: Due to urbanization, large portions of vegetated territory have been replaced by waterproof surfaces. The consequences are greater outflows, lower infiltration, and lower evapotranspiration. Pavement systems made with permeable surfaces allow the infiltration of water, ensuring reduction of runoff volume. In this paper, the methods of analysis of the hydrological and environmental performance of the pavement systems are reviewed in the context of urban drainage and regarding their durability. The purpose is to present an overview of the studies published during the last decade in the field. The Pubmed and Web Science Core Collection electronic databases were used to conduct the scientific literature survey. This generated 1238 papers, of which only 17 met the criteria and were included and discussed in this review. The evidence drawn from the knowledge on which the document is based provides useful critical interpretations of existing studies to progress the current understanding on hydrological performance and environment impacts in terms of conventional pollutant removal efficiency and the current permeable pavement systems.
Testing of Railway Vehicles Using Roller Rigs
(Vilnius Gediminas Technical University, Vilnius, Lithuania, 2017) Myamlin, Sergey V.; Kalivoda, Jan; Neduzha, Larysa O.
EN: Roller rigs are laboratory devices enabling to study various phenomena in the field of railway vehicles dynamics and the wheelrail contact. The main benefits of roller rig experiments are high controllability, repeatability and flexibility of experiment setup and usually also lower costs compared to the field tests. One of the goals of joint cooperation between the Czech Technical University in Prague, Czech Republic (CTU) and the Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Ukraine (DNURT) is to design, build, and finally to operate at the DNURT laboratory the new roller rig. The presented paper is an initial study prepared within the framework the joint project. It summarizes the possibilities of roller rig utilization for railway vehicles research and describes the main concepts of existing design solutions.