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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.
Calculation of Parameters of Switching Unit with Corrective Links in Thruster Dc-Dc Converters
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Bobyr, Dmytro V.; Kolodii, D. O.
ENG: The engineering method of calculating parameters of commutation unit at the stage of designing thruster converters is considered.
A Case Study of the Use of Statistical Processing of the Armature Rotation Irregularities for the Diagnostics of Locomotive Traction Electric Motors
(Vilnius Gediminas Technical University, 2025) Bodnar, Boris Ye.; Ochkasov, Oleksandr B.; Hryshechkina, Tetiana S.; Petrenko, Viačeslav
ENG: Locomotive Traction Electric Motors (TEMs) generate power to rotate the wheelsets of diesel or electric locomotives, electric or diesel multiple units. TEMs are the most critical parts of traction rolling stock on which exploitation costs, reliability and train traffic safety depend. The purpose of the article is to evaluate the possibility of diagnostics the technical condition of the TEM using the rotation irregularities of the armature shaft in the electric motor as a diagnostic parameter. The article analyses the main causes of TEM failures and methods for diagnosing electric motors in operation. The expediency of using the rotation irregularities of the armature shaft in the electric motor as a diagnostic parameter is substantiated. The structural flowchart of the device for measuring the rotation irregularities of the armature is presented. Diagnosing the mechanical part of an electric motor is chosen as an implementation example. The authors confirmed the connection between the technical condition of the electric motor and the statistical indicators calculated for the signal of the rotation irregularities of the armature shaft.
Choosing the System of Locomotive Maintenance in View of the Effect of Dependent Failures
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2018) Bodnar, Borys Ye.; Ochkasov, Oleksandr B.; Hryshechkina, Tatiana S.; Bodnar, Yevhen B.
ENG: Purpose. Improving the efficiency of the use of locomotives by choosing a rational maintenance system that takes into account the assessment of the effect of dependent failures on the cost of their life cycle is the main purpose of this paper. Methodology. The relevance of introducing LCC (life cycle cost) approaches in locomotive facilities is explained by the introduction of new locomotives with on-board control and diagnostic systems, as well as the development of the theory of traction rolling stock maintenance systems. The cost of a locomotive as a traction unit ceases to be the determining factor. This is because the locomotive maintenance and repair cost for the entire period of its operation is much higher than the initial cost of the locomotive. The paper analyses the existing approaches to managing the cost of the life cycle of locomotives at the stages of selecting, updating, upgrading and operating the traction rolling stock. The necessity of improving the methods for assessing the degree of influence of reliability indicators of locomotive assemblies on the choice of the maintenance system and the cost of the locomotive life cycle is substantiated. Findings. It is proposed to use the concept of «the effect of dependent failures» when calculating the cost of locomotive renewal after unscheduled repairs and its life cycle cost. We improved the methods for determining the cost of unscheduled repairs, taking into account dependent failures and the coefficient of assessment of the effect of dependent node failure on the locomotive maintenance system. The proposed coefficient will determine the nodes, the failure of which affects the renewal cost more than their nominal value. It will also help to take into account the probable losses due to node failure during the development and adjustment of the locomotive maintenance system. Originality. For the first time, it is proposed to use the concept of the effect of de-pendent failures to calculate the locomotive renewal cost when performing unscheduled repairs, as well as the loco-motive life cycle cost. Practical value. The improved calculation method for determining the cost of unplanned repairs with account taken of dependent failures can be used to compare and evaluate different variants of the locomotive maintenance system and to develop the locomotive diagnostic systems.
Classification of Quality Conditions of a Traction Motor Frame Insulation of Locomotives
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Kapitsa, Michail І.; Laguta, Vasiliy V.; Kozik, Yuriy
ENG: Abstract. The objective of the article is to determine the quality conditions of a locomotive traction motor frame insulation based on observations over the recovery voltage and classification of a tested insulation wear degree as well as to determine estimates of operating time until the insulation restoration or replacement with a new one. To classify the insulation quality conditions and to forecast its residual life until the restoration, a cluster analysis and discriminant analysis are used based on indicators reflecting the properties of an insulation recovery voltage curve. The study defines an information content received from frame insulation recovery voltage readings as compared with its resistance from the perspective of testing the insulation condition and predicting its residual life. Statistical characteristics of clusters corresponding to the insulation condition stages allow determining the limit values of predicting parameters and estimating the residual insulation life prior the restoration. To classify the insulation condition, an integrated evaluation of the insulation condition quality is proposed. Integrated evaluation is performed according to the recovery voltage curve and is used as an indicator during clustering. An experimental study of the proposed method practically confirmed its effectiveness.
Consideration of Dependent Failures Impact on Selecting the System of Locomotive Maintenance
(Kaunas Univ. of Technology, Palanga, Lithuania, 2019) Bodnar, Borys Ye.; Ochkasov, Oleksandr B.; Bodnar, Yevhen B.; Hryshechkina, Tatiana S.; Skvireckas, R.
ENG: Modern measures aimed at reducing the operating costs are closely related to such concepts as LCC and RAMS-approach. The article analyzes the existing standards that regulate their usage. The purpose of the research is to improve the methodology for determining the renewal costs of locomotive nodes with due regard to dependent failures. To describe the propagation of dependent failures in the system, the authors propose to use the wave approach. The dependent failures impact on the system is determined on the basis of information about the relationship between elements and data from a technological-economic map concerning the cost of locomotive nodes renewal. To take into account the probabilistic nature, the authors propose to use the methods of expert research for determining the probability of failure of dependent elements. The authors proposed a method for determining the probability of the locomotive nodes breakdown considering the dependent failures. The method of calculating the average cost of unscheduled repair, considering the dependent failures of interrelated elements was improved. For the first time, a recurrence relation on a set is deduced, by which the volume of damage is calculated at the dependent failures of elements in a complex system. The coefficient, which will allow assessing the impact of dependent failures on the maintenance system and the life cycle cost of a locomotive, is proposed. On the basis of the proposed method, the calculations for the electric equipment of electric locomotives, DE1 series were made. A comparison of the renewal cost of electrical equipment with considering the dependent failures of related elements was made.
Defining the Limits of Application and the Values of Integration Variables for the Equations of Train Movement
(National Technical University «Dnipro Polytechnic», 2019) Bodnar, Borys Ye.; Kapitsa, Mykhailo I.; Bobyr, Dmytro V.; Kyslyi, Dmytro M.
ENG: Railway transportation is an integral part in the transport infrastructure of our country. They cover passenger and cargo transportations by Ukrzaliznytsia, industrial enterprises, including transportation of the mining sector, which is characterized by heavy loads on the traction rolling stock due to large gradients of the track profile. Railway transport management is always preceded by traction calculations, the center of which is to solve the equation of train movement.Purpose.To determine the rational values of the variables in solving the equation of train movement, as well as relevant limits in their applicability.Methodology. To achieve the purpose, methods of system analysis, nonlinear programming, numerical methods for solving differential equations, namely the classical, Runge-Kutta-Feelberg, and Rosenbrock methods, are used. Computational accuracy was verified using simulation methods and compared with experimental data. Findings. The results of the research involve increasing the calculating speed when solving the equation of train movement without loss of accuracy, which allowed using the proposed method in on-board systems of locomotives. Originality. During the research, new scientifically grounded results were obtained that solve the scientific task in improving the energy efficiency of train operation, and are of great importance for railway transport. The obtained results constitute the originality, which consists in determining the rational limits of applicability and the value in a step of integration variables for the equations of the train movement. Practical value. The research results allow reducing the cost of energy consumed by hauling operations due to the promt recalculation of rational control modes when changing the train situation.
Determination of Integrated Indicator for Analysis of the Traffic Safety Condition for Traction Rolling Stock
(Kaunas University of Technology, Kaunas, Lithuania, 2018) Bodnar, Borys Ye.; Bolzhelarskyi, Yaroslav V.; Ochkasov, Oleksandr B.; Hryshechkina, Tatyana S.
ENG: Traffic safety is a major priority in railway transport operation. Locomotive facility is one of the responsible units in general system of railways. A complex and cumbersome system of indicators is used in locomotive facilities to analyze the operation. The existing system makes it difficult to analyze the general level of work organization in the locomotive facilities. Purpose of the study is to determine the methodology of forming a certain dimensionless indicator (or group of indicators) that will reflect the general level of safety in the locomotive facilities. As the research methodology it was chosen principal component analysis as the corresponding mathematical apparatus, which makes it possible to analyze the existing indicators characterizing the performed work and the traffic safety condition with the necessary degree of informativity. As a result, the main components and the degree of their influence on the general level of traffic safety in the locomotive facilities are set. The indicators that have the most influence on the technical and safety components of the integrated indicator of traffic safety condition are determined. Originality of the work is that it for the first time proposes the concept of index of traffic safety condition and the method of its determination using the principal component analysis. Practical value of the work lies in the fact that the ranking of technical and safety components according to the degree of their influence on the general traffic safety index has been performed. Also, the locomotive units which have the greatest influence on the traffic safety condition and reliability were determined.
Determining Permissible Speed of Tilting Train in Curved Track
(Дніпровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2017) Kapitsa, Mykhaylo I.; Bobyr, Dmytro V.; Desiak, Andrii Y.
ENG: Purpose. The main purpose of the article is to determine the permissible speed of the air-cushioned tilting train in curved track and to justify the expediency of operating this type of rolling stock on the railways of Ukraine to increase the speed, improve the passenger comfort and save the energy due to more uniform high-speed train driving. Methodology. The determination of the maximum permissible speed of the tilted train in curved track involves the use of methods of linear and vector algebra and empirical formulas for applied scientific and technical research. The calculation of the maximum speed is based on the principle of calculating centrifugal force for the velocities that meet the safety criteria of movement on the horizontal unbalanced acceleration in the stable radius curve. Findings. The results of the calculations showed that in the 1000 m radius curved track section, provided the passenger comfort, the maximum permissible speed of the train without forced tilt is 132 km/h, and with the forced tilt – 189 km/h. The velocity gain in the curve is about 30% and up to 10% on the section (depending on the number of curves). Originality. The method of determining the permissible speed of the tilted train in curved track is improved, which consists in determining the permissible centrifugal force acting on the train in the stable radius curve, taking into account the passenger comfort conditions. Practical value. This method allows accurately determining the permissible speed on the condition of passenger comfort in the curved section and the required additional tilt angle of the train, depending on the speed, curve radius and canting. Enhanced speed and comfort of passenger trains in the future will increase the demand for rail services among the population and strengthen the position of rail transport in Ukraine’s transport system.
Determining the Energy Efficiency Indicators of the Diesel Train DPKr-2 and the Rail Bus 620M Based on Traction Calculations Using the Numerical Method of Solving the Equation of Train Movement
(MATEC Web of Conferences, 2024) Kapica, Mihajlo; Bobyr, Dmytro V.; Hryshchenko, Mykola A.; Kyslyi, Dmytro M.; Desiak, Andrii Y.
ENG: The purpose of the article is to compare the technical and energy parameters of the diesel train DPKr-2 and the railbus 620M based on traction calculations using mathematical modeling when solving the train movement equation. The mathematical model of the train is adapted to determine the movement parameters of the specified rolling stock units according to different variable phase coordinates for different movement modes. To achieve this purpose, the authors used methods of system analysis, nonlinear programming, and numerical methods for solving differential equations. The accuracy of the calculations was verified using simulation modeling methods and compared with experimental data. To analyze the results, the obtained indicators of traction calculations – technical speed and specific consumption of diesel fuel – were compared. As a result of the comparison, the specific fuel consumption per ton-kilometer meter, a significant saving of energy resources is observed. Comparative specific fuel consumption per passenger-kilometer meter, on the contrary, indicates an increase in the consumption of energy resources. The mathematical model of the train is adapted to determine the movement parameters of diesel trains and rail buses according to different variable phase coordinates for different drive modes. The practical significance lies in determining the efficiency indicators of the use of different types of rolling stock on the railways of Ukraine, taking into account economic, social and migration factors.
Devising a Procedure for Calculating the Technical Condition Index of Locomotive Nodes Based on Monitoring Results
(Technology Center, Kharkov, Ukraine, 2021) Bodnar, Borys Ye.; Ochkasov, Oleksandr B.; Ochkasov, Mykhailo
ENG: The widespread introduction of information technologies in the systems that manage technical fleets, the use of maintenance and repair systems based on risk assessment, is based on the calculation of a large enough number of indicators. Modern locomotives are equipped with systems for monitoring and diagnosing technical condition. Combining these systems with the Internet of Things and Big Data technologies provides an opportunity to use completely new approaches to fleet management. At the initial stage of the construction of such systems, it is necessary to devise criteria that make it possible to automatically determine the technical condition of a locomotive and its components in order to identify the locomotive in the total fleet that requires maintenance or repair. A procedure has been proposed for calculating the technical condition index of locomotives and their components based on data from monitoring systems. The procedure is based on the formation of latent diagnostic parameters employing the principal component method and on the subsequent calculation of the weight coefficients of these parameters applying the method of hierarchy analysis. The special feature of the proposed procedure is that when calculating the index, those latent diagnostic parameters are used that are derived from the group of control parameters whose weight coefficients are computed using the method of hierarchy analysis without involving experts. This paper reports the results from calculating the informativeness of the diagnostic parameters of load, loss, input, as well as their weight coefficients. The highest information content, from 0.5 to 0.85, is demonstrated by the load parameter; the smallest (0.05‒0.26) ‒ the input parameter. The average value and the dependences of changes in the technical condition index of a hydraulic transmission during the tests have been determined. Analysis of the technical condition index makes it possible to assess the transmission’s response to changes in test modes, the dynamics of changes in losses.
Devising a Procedure to form the Diagnostic Parameters for Locomotives using a Principal Components Analysis
(Technology Center, Kharkov, Ukraine, 2021) Bodnar, Borys Ye.; Ochkasov, Oleksandr B.
ENG: Modern diagnostic systems are characterized by that the flow of diagnostic information requires significant computational resources to process. In order to improve the reliability of the object to be diagnosed and reduce operating costs, it is necessary to improve procedures for analyzing diagnostic results. This paper suggests a procedure to form the diagnostic features of locomotive nodes based on the use of a principal components analysis. The proposed approach is distinguished by a decrease in the dimensionality of the input set of diagnostic features in order to select the sets of interconnected diagnostic parameters. Based on the selection of the sets of interconnected diagnostic features, constructing new latent diagnostic parameters has been proposed. A latent diagnostic parameter contains information that combines data from several initial diagnostic features. The result of the method is a set of latent diagnostic parameters that do not correlate with each other and reflect the behavior of the object to be diagnosed from different technical points. The application of a sufficient number of latent diagnostic parameters involved the scree test method. This paper reports the results from using the proposed approach for treating the results from diagnosing the hydraulic transmissions in locomotives. The result from applying the procedure has made it possible to propose using three latent diagnostic parameters to assess the technical condition of a locomotive’s hydraulic transmission during bench tests. The suggested parameters contain 90 % of the original information and reflect losses in the transmission, as well as the load at the input and output of the transmission.
Devising an Analytical Method for Solving the Eighth-Order Kolmogorov Equations for an Asymmetric Markov Chain
(РС ТЕСHNOLOGY СЕNTЕR, Kharkiv, 2024) Kravets, Victor; Kapitsa, Mykhailo I.; Domanskyi, Illia; Kravets, Volodymyr; Hryshechkina, Tatiana S.; Zakurday, Svitlana
ENG: The object of research is a complex system of three subsystems, which function independently of each other and are in a working or failed state. There is a need to analytically model and manage the Markov random process in the system, varying the intensity of their development-restoration and degradation-destruction flows. In the study, an analytical method for solving Kolmogorov equations of the eighth order for an asymmetric Markov chain was devised. The corresponding Kolmogorov equations of the eighth order have an ordered transition probability matrix. The distribution of the eight roots of this equation in the complex plane has central symmetry. The results are analytical solutions for the probabilities of the eight states of the Markov chain in time in the form of ordered determinants with respect to the indices of the eight roots and the indices of the eight states, including the column vector of the initial conditions. Symmetry has been established in the distribution on the complex plane of eight real, negative roots of the characteristic Kolmogorov equation centered at the point defined as Re ϑ = –a7/8, where a7 is the coefficient of the characteristic equation of the eighth degree at the seventh power. Formulas expressing eight roots of the characteristic Kolmogorov equation have been heuristically derived, one of which is zero, due to the intensities of failures and recovery of three subsystems, the eight states of which in general make up an asymmetric Markov chain. For structures consisting of three independently functioning processes, the random process of the transition of the structure through eight possible states with a known initial state is determined in time. An analytical solution to Kolmogorov differential equations of the eighth order for an asymmetric state graph is proposed in harmonic form for the purpose of analysis and synthesis of a random Markov process in a triple system.
Diesel Engines In-Place Diagnosis of Diesel Locomotives: Modern Approaches and Practical Application
(Printing House “Technologija”, Kaunas, Lithuania, 2024) Bodnar, Borys Ye.; Ochkasov, Oleksandr B.; Studenko, O.
ENG: This paper is devoted to research of modern methods for the diesel engines in-place diagnosis of diesel locomotives. In the conditions of intensive operation and growing requirements for the reliability of locomotives, ensuring timely detection and elimination of malfunctions is critically important. A review of modern approaches, such as vibration diagnostics, acoustic analysis, and the use of computer monitoring systems, allows us to assess their effectiveness and feasibility of application in practice. The authors paid special attention to methods of processing information obtained as a result of diagnostics, in particular, the use of neural networks, artificial intelligence, and machine learning to analyze and predict the technical condition of engines. The article also discusses the practical aspects of implementing these methods in rail transport, including technical requirements, economic efficiency, and advantages for the operational reliability of diesel locomotives. The results of experimental studies and examples of successful application of in-place diagnosis methods on real objects are presented.
Efficiency of Modernization of Wheel-Motor Blocks using Anti-Friction Traction Motor Support Bearings
(Дніпропетровський національний університет залізничного транспорту ім. акад. В. Лазаряна, Дніпро, 2018) Kapitsa, Mykhaylo I.; Gnennyi, O. M.; Bobyr, Dmytro V.
ENG: Purpose. The use of anti-friction traction motor support bearings (TMSB) instead of plain friction traction motor support bearings is a priority direction of locomotive development both for newly constructed locomotives and for those in operation. The solution of the set tasks for introduction of wheel-motor blocks (WMB) with anti-friction bearings demanded the search for alternative variants and new technical solutions. The purpose of the article is to determine the feasibility of re-equipping the diesel locomotive wheel-motor blocks with anti-friction bearings through the life cycle calculation (LCC). Methodology. The procedure and criteria for assessing the economic efficiency of project (investment) proposals and investment projects approved by the Cabinet of Ministers of Ukraine envisage that the cost-effectiveness analysis of an investment project is carried out according to the following criteria: net present value, internal rate of return, discounted payback period and profitability index. The use of these criteria of economic efficiency fully corresponds to modern principles, theoretical-methodical approaches and world practice in evaluating the efficiency of investments. The evaluation of the technical and economic efficiency of the modernization of the diesel locomotive wheel-motor block is made on the basis of calculation and comparison of the following criteria: the net present value (NPV) of modernization, the internal rate of return (IRR), the profitability index (PI) and the discount payback period. Findings. The results of the calculations of the values of the main criteria show that the innovative project for the modernization of the locomotive provides a high level of economic efficiency. At the same time, the value of the discounted payback period of investments in modernization indicates that it is expedient to carry out this operation if the residual life of the upgraded locomotive of the M62 series is at least 15 months. Originality. Taking into account the specifics of the type of locomotive work in freight traffic, we developed a method to determine the individual components of the average annual economic effect of modernization of the diesel locomotive wheel-motor block, which includes saving of oil costs, repairing and servicing the diesel locomotive wheel-motor unit, as well as change of TMSB brass and saving fuel costs for traction. Practical value. The results of the work make it possible to determine the expediency of modernization of diesel locomotives taking into account the features and conditions of their operation and the specifics of modernization.
Energy Efficiency of Diesel locomotive Hydraulic Transmission Tests at locomotive Repair Plant
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2015) Bodnar, Borys Ye.; Kapitsa, Mykhaylo I.; Ochkasov, Oleksandr B.; Koreniuk, Roman O.
ENG: Purpose. In difficult economic conditions, cost reduction of electricity consumption for the needs of production is an urgent task for the country’s industrial enterprises. Technical specifications of enterprises, which repair diesel locomotive hydraulic transmission, recommend conducting a certain amount of evaluation and regulatory tests to monitor their condition after repair. Experience shows that a significant portion of hydraulic transmission defects is revealed by bench tests. The advantages of bench tests include the ability to detect defects after repair, ease of maintenance of the hydraulic transmission and relatively low labour intensity for eliminating defects. The quality of these tests results in the transmission resource and its efficiency. Improvement of the technology of plant post-repairs hydraulic tests in order to reduce electricity consumption while testing. Methodology. The possible options for hydraulic transmission test bench improvement were analysed. There was proposed an energy efficiency method for diesel locomotive hydraulic transmission testing in locomotive repair plant environment. This is achieved by installing additional drive motor which receives power from the load generator. Findings. Based on the conducted analysis the necessity of improving the plant stand testing of hydraulic transmission was proved. The variants of the stand modernization were examined. The test stand modernization analysis was conducted. Originality. The possibility of using electric power load generator to power the stand electric drive motor or the additional drive motor was theoretically substantiated. Practical value. A variant of hydraulic transmission test stand based on the mutual load method was proposed. Using this method increases the hydraulic transmission load range and power consumption by stand remains unchanged. The additional drive motor will increase the speed of the input shaft that in its turn will allow testing in closer to real conditions as a result of increased load on the hydraulic transmission. Increased load on the hydraulic transmission will help to detect possible defects and hence will improve the quality of transmission repairs.
Implementing Intelligent Monitoring of the Technical Condition of Locomotive Hydraulic Transmissions
(Springer, Cham, 2023) Bodnar, Boris Ye.; Ochkasov, Oleksandr B.; Petrenko, Viačeslav; Martishevskij, Michail
ENG: The study is aimed at replacing outdated approaches in the organization of maintenance of the locomotive fleet. The article presents а comparative analysis of maintenance strategies for traction rolling stock. The necessity of introducing control over the technical condition of locomotives to ensure the transition to а preventive maintenance system is substantiated. Directions of research - adjustment of the existing volumes and frequency of repairs, the introduction of individual repair strategies, the introduction of adapted and flexible approaches to the maintenance of locomotives. To improve the efficiency of monitoring the technical condition of locomotives, the use of factor analysis methods is proposed. The purpose of using factor analysis methods is to reduce the number of analysed parameters, while the information content of monitoring the technical condition should not decrease. The results of applying the method of principal components to assess the technical condition of the hydraulic transmission of а diesel locomotive during testing are presented. It is proposed to use the concept of latent diagnostic parameters to assess the technical condition of locomotive units. Considering the physical meaning of the processes occurring in the hydraulic transmission, as а result of the analysis, three groups of latent parameters were identified: "Load", "Losses", "Input". These parameters characterize the technical condition of the hydraulic transmission. Each of the latent parameters includes information from а group of physical process sensors. The implementation of the considered approach will ensure the effective use of monitoring results and а gradual transition to predictive maintenance.
Improving Operation and Maintenance of Locomotives of Ukrainian Railways
(Vilnius College of Technologies and Design, Vilnius, Lithuania, 2016) Bodnar, Borys Ye.; Ochkasov, Oleksandr B.; Bobyr, Dmytro V.
ENG: The results of research according to operation system improvement and locomotive technical equipment of Ukrainian railways are represented in the article. The scientific work is carried out by “Technical maintenance and diagnostics of locomotives” laboratory of Dnipropetrovsk National University of Railway Transport named after acad. V. Lazaryan. The methods and hardware and software system of train handling rational modes selection are developed for exploitation system improvement. The theoretical basis of implementation necessity of technical diagnostics equipment in locomotive unit is outlined in the article. The method for determining the limits of diagnostic parameters change is suggested. The method can be used in the preliminary stage of locomotives maintenance development system, the locomotives are equipped with on-board diagnostics systems. The examples of diagnostic systems for locomotives node points and their work results are enumerated.
Information-Measuring Test System of Diesel Locomotive Hydraulic Transmissions
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2015) Zhukovytskyy, Igor V.; Kliushnyk, Ihor A.; Ochkasov, Oleksandr B.; Korenyuk, Roman O.
ENG: The article describes the process of developing the information-measuring test system of diesel locomotives hydraulic transmission, which gives the possibility to obtain baseline data to conduct further studies for the determination of the technical condition of diesel locomotives hydraulic transmission. The improvement of factorytechnology of post-repair tests of hydraulic transmissions by automating the existing hydraulic transmission test stands according to the specifications of the diesel locomotive repair enterprises was analyzed. It is achieved based on a detailed review of existing foreign information-measuring test systems for hydraulic transmission of diesel locomotives, BelAZ earthmover, aircraft tug, slag car, truck, BelAZ wheel dozer, some brands of tractors, etc. The problem for creation the information-measuring test systems for diesel locomotive hydraulic transmission is being solved, starting in the first place from the possibility of automation of the existing test stand of diesel locomotives hydraulic transmission at Dnipropetrovsk Diesel Locomotive Repair Plant «Promteplovoz». Methodology. In the work the researchers proposed the method to create a microprocessor automated system of diesel locomotives hydraulic transmission stand testing in the locomotive plant conditions. It acts by justifying the selection of the necessary sensors, as well as the application of the necessary hardware and software for information-measuring systems. Findings. Based on the conducted analysis there was grounded the necessity of improvement the plant hydraulic transmission stand testing by creating a microprocessor testing system, supported by the experience of developing such systems abroad. Further research should be aimed to improve the accuracy and frequency of data collection by adopting the more modern and reliable sensors in tandem with the use of filtering software for electromagnetic and other interference. Originality. The authors developed the information-measuring system that improves the hydraulic transmission test process by automating and increasing the accuracy of measurements of control parameters. The measurement results are initial data for carrying out further studies to determine the technical condition of the hydraulic transmission UGP750-1200 during the plant post-repair tests. Practical value. The paper proposed the alternate design of microprocessor hydraulic transmission test system for diesel locomotives, which has no analogues in Ukraine. Automated data collection during the tests will allow capturing the fast processes to determine the technical condition of hydraulic transmission.
Mathematical Model of the Derailed Train Wheel Motion
(Silesian University of Technology, Poland, 2016) Bodnar, Borys Ye.; Bolzhelarskyi, Yaroslav V.; Laushnyk, Igor P.
ENG: It is developed a mathematical model of the derailed train wheel motion, which makes it possible to determine a change in its speed when moving on the track panel. When constructing the model the methods of theoretical mechanics and train traction were used. It was found that the highest speed reduction occurs as a consequence of the wheel impact on the sleeper. The model allows creating a generalized mathematical model of the train motion in the emergency mode.
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.
Optimality Criteria for the Process of Technical Operation of Locomotives
(MATEC Web of Conferences, 2024) Kapica, Mihajlo; Bobyr, Dmytro V.; Kyslyi, Dmytro M.; Desiak, Andrii Y.; Bohomolov, Andrii
ENG: The efficiency of a locomotive fleet as a complex system depends significantly on the mode and conditions of its operation, which, in many cases, are determined both by its own condition and by the state of the maintenance system. In reality, changes in the state of the system, and its further behaviour in most cases can be described by the Markov process. It should be noted the excessive rigidity of the hypothesis about the Markov character of the behaviour in the process of technical operation of the locomotive fleet that makes the resulting model insufficiently adequate. The article proposes a methodology to assess the efficiency in the functioning of the locomotive fleet as a semi-Markov system. Relationships for calculating the main statistical characteristics of the efficiency indicators in the process of technical operation of locomotives have been obtained. The choice of optimality criteria for the process is justified. A procedure for constructing an ordered sequence of enhancing maintenance and repair strategies, considering the condition of a particular locomotive has been offered. Determining the optimality criteria for the technical operation process of the locomotive fleet based on the research of stochastic estimates in the efficiency of the semi-Markov model. Obtaining a sequence of maintenance and repair strategies. The efficiency of locomotive fleet operation significantly depends on the quality of service. The quality of service is determined by the effectiveness of diagnostic tools for technical conditions. The process of operating a locomotive fleet is described by a semi-Markov model. The semi-Markov model used makes it possible to more fully take into account, in the general case, the diagnostic support of the locomotive and the restoration process. The unit cost function the average unit cost, the average unit loss coefficient the coefficient of average, and operating factor was selected as target functions. A procedure has been proposed for constructing an ordered sequence of improving maintenance and repair strategies, considering the condition of a particular locomotive.
Rational Recovery Model of Depot Processing Equipment at the Industrial Enterprise
(Дніпропетровський національний університет залізничного транспорту імені акдеміка В. Лазаряна, Дніпропетровськ, 2014) Kapitsa, Mykhaylo I.; Grishechkina, Tatiana S.
ENG: Purpose. The problem of the maximum resources recovery of rolling stock repair depot of industrial enterprise with limited resources consumption, which are used in the system is today’s topical question.The main factors that affect the repair depot operation of industrial enterprise are reviewed. The most significant factors, affecting the quality of the repair depot, are emphasized for further study, specifically - the state of the major repair equipment of a sector. There is a need to minimize the impact of the unsatisfactory state of this factor. Methodology. The formed task of major equipment rational repairing in the mathematical sense is based on the solution of a vector optimization problem. In this case the target functions are the monetary funds spending and time expenditure for repairing. Findings. The mathematical model of optimal equipment maintainability of the repair department at the industrial enterprise was developed by the authors. On the example the choice model of optimal path for equipment repairing of enterprise repair department is described. Originality. As a result of the conducted research the repairing system of major equipment of industrial enterprise sectors was improved. As the mathematical model of rational system recovery of industrial enterprise repair depot we recommend apparatus of class problems of vector optimization. Practical value. Using the proposed model of major equipment repair system of the repair depot at the industrial enterprise will improve the quality of the department by increasing the efficiency of primary resources - time and monetary funds - which are spent by the sector in order to repair its techniques.
Rationale for Choosing the Type of Traction Rolling Stock for the Enterprise of Industrial Transport
(Kaunas University of Technology; Publishing House “Technologija“, Kaunas, Lithuania, 2018) Kozachenko, Dmytro M.; Dovbnya, Mikola P.; Ochkasov, Oleksandr B.; Serdiuk, Volodymyr N.; Shepotenko, Anatolii P.; Keršys, A.
ENG: Shunting locomotives are used to carry out shunting and clean-up operations on the routes of most private and state enterprises of industrial transport in various spheres of activity. In most cases, the power of these locomotives significantly exceeds the pre-determined volume of works, especially if the work has cyclical nature. One of the options for solving the problem of transportation for owners of small industrial enterprises, grain elevators and other similar enterprises may be the presence of their own traction rolling stock. Moreover, its technical and economic characteristics must fully comply with the conditions and volumes of shunting/clean-up operations of the enterprise. Definition of the most rational type of traction rolling stock should be carried out taking into account the available track infrastructure of the enterprise, volumes and organization of shunting and clean-up operations, organization of the system and production cost of maintenance and repair. The authors proposed a technique of comparative analysis of technical and operational indicators for the utilization of various types of traction rolling stock using traction calculation methods and ways to organize the operational performance. This will allow the owner of the industrial enterprise to choose the type of traction rolling stock (locomotive, locotractor or steam-accumulator locomotive), which most closely comply with the conditions of a particular enterprise. At the same time, the company's cost reduction for operation of the traction rolling stock is ensured.
Research of Mathematical Model of Movement of Six-Axle Locomotives with Controllable Wheelsets Installation
(Springer, Cham, 2020) Kliuiev, Serhii; Bobyr, Dmytro V.; Vaičiūnas, Gediminas; Steišūnas, Stasys
ENG: Research of mathematical model of movement of six-axial locomotive with controllable wheelsets installation. Based on the general system of nonlinear variable coefficient differential equations of the vehicle movement in a rail track with inequalities in plan, the mathematical model of movement dynamics of locomotive of improved design with the axial formula 30-30 as an object of automatic control of the wheelsets position in the rail track is considered. Movement simulation is performed on the example of a six-axle locomotive at the speeds of movement and parameters of the curvilinear track sections, which coincide with the conditions of the experiment presented in the thesis work of V. N. Yazykov. The article presents research results of the mathematical model of movement of the improved locomotive bogie with controllable wheelsets installation in the curvilinear track sections using the Matlab/Simulink software package. The results of experimental studies of the All-Russian Scientific-Research and Design Technological Institute of Rolling Stock and the performed theoretical studies show that the efficiency of the improved system for controlling the wheelset position is higher than that of the serial design, in all modes of movement. The improved system of automatic control of wheelsets position makes it possible to reduce guiding forces by 35%. The possibility of using the mathematical model of locomotive movement of the axial formula 30-30 of improved bogie design with axle-box links of adjustable length, taking into account the dynamics of the automatic control system of the wheelsets installation in the rail track, is theoretically substantiated. The theoretical research found out the reduction of lateral forces in the improved bogie design during the passage of curvilinear track sections. The use of the explored mathematical model of locomotive movement reduces the volume and complexity of research works, as well as increases the reliability of engineering calculations when designing new and improving existing designs of the locomotive underframe.
Safety Performance Analysis of the Movement and Operation of Locomotives
(Kaunas University of Technology; Publishing House “Technologija“, Kaunas, Lithuania, 2018) Bodnar, Borys Ye.; Ochkasov, Oleksandr B.; Bodnar, Yevhen B.; Hryshechkina, Tatiana S.; Keršys, Robertas
ENG: To estimate the state of the locomotive facility and work, performed by the locomotives, a system of planned and calculated indicators is used. The state of traffic safety in a locomotive facility is estimated in most cases by comparing the absolute number of traffic incidents with previous periods. Accordingly to the existing system of traffic safety analysis, the volume of work performed in the locomotive facility is not taken into account. The purpose of the research is to determine the methodology for forming a certain dimensionless indicator (or group of indicators) that will reflect the overall level of safety in the locomotive facility, taking into account the volumes of work performed by locomotives. The authors suggest the usage of the relative indicators to estimate the state of traffic safety, factoring in the volumes of transportation. As a method of research, we chose the method of the main components as the appropriate mathematical apparatus, which allows analysing the proposed indicators, characterizing the performed work and the traffic safety state with the necessary degree of informativeness. As a result, the most informative indicators and the degree of their correlation with the general index of traffic safety state were determined. Originality of the study lies in the fact that the system of indicators for the traffic safety analysis was improved; the concept of the traffic safety state index and the method of its determination using the method of the main components were improved. The practical value of the work is that we propose to use the relative indicators for estimating the traffic safety, taking into account the volumes of transportation; the ranking of the proposed indicators accordingly to the degree of their impact on the overall level of traffic safety is performed.
Selecting the Parameters of The Diagnosis of Frame Insulation Condition in Electrical Machines of Locomotives
(SPC, Научно-издательская корпорация, ОАЕ, 2018) Kapitsa, Michail І.; Laguta, Vasiliy V.; Kozik, Yuriy
ENG: The purpose of this study is to determine the signs displaying the insulation ageing process and allow predicting the change in its tech-nical condition under operation of traction motors in locomotives. In order to choose the indicators of the insulation condition, the methods of linear electrical circuits were used to analyze the equivalent scheme of frame insulation. In the equivalent scheme, the dielectric micro- and macro-heterogeneities were taken into account. The most informative parameters of the frame insulation ageing process are those related to absorption and resorption processes over time. The return voltage has been selected as the main characteristic to determine the indicators of insulation condition. The analytical dependences for determining the frame insulation condition indicators have been obtained different from those currently used in the diagnosis of electrical machines. The choice of indicators will allow predicting changes in the technical condition of frame insulation in operation. The studies will allow us to change the regular preventive maintenance technology to the maintenance based on the facility condition.
Signal Analysis of the Armature Rotation Irregularities in the Traction Electric Motor by Unsupervised Anomaly Detection Methods
(Kaunas University of Technology, Lithuania, 2022) Bodnar, Borys Ye.; Ochkasov, Oleksandr B.; Serdiuk, Volodymyr N.; Ochkasov, Mykhailo
ENG: Reducing the cost of maintenance and repair of vehicles is possible due to the early detection of malfunctions development and more complete use of the equipment resource. The introduction of contemporary information technologies allows real-time monitoring of the technical parameters for the equipment. Anomaly detection methods are used to process monitoring results. The paper presents the results of using the Unsupervised Anomaly Detection methods to analyze the signal of the rotation velocity irregularity of the armature shaft in the traction electric motor of a locomotive. When analyzing signals corresponding to faulty electric motors, anomalous components were identified. As the example of analyzing the signal of an electric motor with an increased radial clearance, the possibility of detecting the development of a malfunction at an early stage has been confirmed. The conducted research confirms the possibility of using anomaly search methods to control the technical condition of the traction electric motor in a locomotive during bench tests.
Simulation of Locomotive Repair Organization by the Methods of Queue Systems Theory
(Дніпропетровський національний університет залізничного транспорту ім. акад. В. Лазаряна, Дніпро, 2018) Bodnar, Borys Ye.; Ochkasov, Oleksandr B.; Bodnar, Yevhen B.; Hryshechkina, Tetiana S.; Ocheretnyuk, Maksym V.
ENG: Purpose. The article is aimed to evaluate the influence of locomotives` operation and reliability indicators on the system of locomotives repair organization in depot, using the methods of queue theory. Methodology. The article describes the locomotive repair workshop using the terms and concepts of the queue systems theory (QST). The tasks solved during simulation of the repair workshop operation are formulated, the list of initial data and simulation results is given. A graphical simulation environment Simulink was used as a software simulation tool. Findings. It was established that the main indicators of locomotive depot operation are affected by the volume of traffic, the reliability of locomotives, the rule used to select locomotives from the queue, the number of operating repair bays. The developed model of the depot repair workshop will make possible rational planning of the repair workshop`s equipment use, the human capital, the time of putting the locomotives into repair taking into account the workshop loading uniformity, as well as to improve the repair parts supply logistics. This model in a simplified form describes the repair process of the main diesel locomotive fleet, and can be supplemented depending on the repair type performed in the depot. Originality. The paper presents the locomotive repair depot as an object of the queue systems theory. The simulation model of the locomotive repair depot was developed. It allows analyzing the influence of various factors on the system of locomotives` repair organization in the depot. Practical value. The obtained results make it possible to determine the influence of locomotives` operation and reliability indicators on the organization of the locomotive repair depot operation. In further studies, the developed model can be used to improve the system of repair organization on the railway network when introducing new series of locomotives and changing the strategy of their maintenance.
Study of Rail Vehicles Movement Characteristics Improvement in Curves Using Fuzzy Logic Mechatronic Systems
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Kapitsa, Michail І.; Mikhailov, Evgen; Kliuiev, Sergii; Semenov, Stanislav; Kovtanets, Maksim
ENG: The article deals with the effectiveness of reducing the level of force interaction of the rail vehicle wheels with rails in curved sections of the track through the use of mechatronic position control systems for wheel pairs in the rail gauge in the horizontal plane. The approaches to the creation of such a mechatronic system operating on the principles of fuzzy logic are described. To determine the angles of attack of wheels on the rails, it was proposed to use the acoustic emission indicators of the contact of the wheel with the rail. To determine the direction of curvature of the rail track, it is advisable to use data from navigation systems. The study of the dynamics of the rail vehicle during the passage of a curved section of the track in real time was carried out using the Matlab/Simulink software package. The proposed mechatronic control system for the position of the wheel sets in the horizontal plane allows to ensure their optimal installation under various driving conditions in the rail gauge. This makes it possible to minimize the angles of attack of the wheels and reduce the forces of the horizontal interaction of the wheels with the rails.
System Choice of the Technical Maintenance of Locomotives Equipped with on-Board Diagnostic Systems
(Kaunas University of Technology; Publishing House “Technologija“, Kaunas, Lithuania, 2017) Bodnar, Borys Ye.; Ochkasov, Oleksandr B.
ENG: Any transport company seeks to reduce the cost of maintenance and repair of rolling stock, while maintaining the reliability of vehicles at a high level. Railway companies are aspiring to improve the railway engines maintaining system. However, many railway companies continue to use the preventive maintenance system for railway engines repairs. This system requires considerable funds for remedial maintenance and not always the amount of maintenance corresponds to real needs. The usage of this approach in the organization of maintenance can be considered morally obsolete. Especially this approach is not effective for railway engines equipped with on-board diagnostic systems. The article compares possible options for organizing maintenance and repair of railway engines. The usage of a combined maintaining system for railway engines equipped with on-board diagnostic systems is proposed. The main tasks that must be solved when choosing a system of technical maintenance of modern railway engines are formulated. The peculiarities of the choice of the between overhauls for railway engines equipped with on-board diagnostics systems are considered. A technology for building control systems for the reliability of hauling equipment is proposed. The issues that were discussed are relevant for many railway companies. The transition to more advanced system of hauling equipment maintenance will lead to a reduction in the cost of repairs while achieving a high level of reliability.
Technical and Energy Parameters Improvement of Diesel Locomotives Through the Introduction of Automated Control Systems of a Diesel
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2015) Kapitsa, Mykhaylo I.; Martyshevskyi, Mykhailo I.; Kyslyi, Dmytro M.; Palii, Іhor I.
ENG: Purpose. Today the issue, connected with diesel traction remains relevant for the majority of industrial enterprises and Ukrainian railways and diesel engine continues to be the subject of extensive research and improvements. Despite the intensive process of electrification, which accompanies Railway Transport of Ukraine the last few years, diesel traction continues to play an important role both in the main and in the industrial railway traction rolling stock. Anyway, all kinds of maneuvering and chores are for locomotives, they are improved and upgraded relentlessly and hourly. This paper is focused on finding the opportunities to improve technical and energy parameters of diesels due to the development of modern control method of the fuel equipment in the diesel engine. Methodology. The proposed method increases the power of locomotives diesel engines in the range of crankshaft rotation (from idle running to maximum one). It was based on approach of mixture ignition timing up to the top «dead» center of piston position. Findings. The paper provides a brief historical background of research in the area of operating cycle in the internal combustion engine (ICE). The factors affecting the process of mixing and its quality were analyzed. The requirements for fuel feed system in to the cylinder and the «weak points» of the process were presented. A variant of the modification the fuel pump drive, which allows approaching to the regulation of fuel feed system from the other hand and to improve it was proposed. Represents a variant of embodiment of the complex system with specification of mechanical features and control circuits. The algorithm of the system operation was presented and its impact on the performance of diesel was made. Originality. The angle regulating system of fuel supply allows automating the process of fuel injection advance angle into the cylinder. Practical value. At implementation the angle regulating system of fuel supply components of the diesel engine remain unchanged It allows installing the system on diesel engines of the existing fleet of locomotives and railroad industries. The system, considered in the modeling process, has demonstrated its desirability and feasibility of practical application for diesel engines.
Usage of Intelligent Technologies in Choosing the Strategy of Technical Maintenance of Locomotives
(Vilnius College of Technologies and Design, Vilnius, Lithuania, 2017) Ochkasov, Oleksandr B.; Shvets, Oleg M.; Černiauskaitė, L.
ENG: The paper substantiates the need to improve the existing strategy in organization of maintenance and repair of locomotives. Many railway companies continue to use the preventive maintenance system for railway engines repairs. This system of maintenance requires considerable funds for repair work, and the amount of repair work not always corresponds to the actual technical condition of the locomotive. The usage of this approach in the organization of maintenance can be considered as morally obsolete. Especially this approach is not effective for locomotives equipped with on-board diagnostic systems. The analysis of maintenance and repair system for locomotives used on Ukrainian and Lithuanian railways is carried out. Alternative approaches to the organization of the locomotive maintenance system and experience of their use in the world are considered. Approaches and methods for the development of an intelligent strategy of maintenance and repairs are proposed. Requirements to the structure and contents of the baseline data for the development of intelligent systems are formulated. A technology for the collection and processing the information of the diagnostic systems for the intellectual strategies development of technical content is proposed. The transition to more advanced strategy of hauling equipment maintenance will lead to a reduction in the cost of repairs while achieving a high level of reliability.
Use of the Wavelet Transform for the Analysis of Irregularity of Crankshaft Angular Velocity
(Kaunas University of Technology; Publishing House “Technologija“, Kaunas, Lithuania, 2018) Bodnar, Borys Ye.; Ochkasov, Oleksandr B.; Chernyayev, Dmytro V.; Skvireckas, R.
ENG: The issue of quick and qualitative receiving of reliable and complete information concerning the technical state of a diesel engine in the locomotive is relevant one, although there are already many technical solutions in this direction. Indirect methods for diesel engine diagnostics are of gain ground. Among the existing methods, the diagnostics of the diesel engine technical state occupies a special place due to the analysis of irregularity of crankshaft angular velocity. Within the working cycle of the diesel engine, the crankshaft angular velocity of rotation is constantly changed. The mechanical inertia system of the pistons, rods and shaft receives impulses of mechanical energy from fuel combustion, as well as pulsed losses of kinetic energy on pump pistons-stroke. Thus, the value and shape of the torque of each cylinder affects the angular velocity of the shaft. The purpose of the research is to study the various types’ application for basic functions of wavelet transform to emphasize the diagnostic information from the signal of angular velocity irregularity of the diesel engine shaft. This will automate the process of diagnosing the diesel engine. The authors conducted simulation of the working process of a shunting diesel locomotive with hydrodynamic transmission. Type of the diesel engine: six-cylinder in-line engine with turbo-charger, power 750 hp. The nominal modes of the diesel engine operation at the crankshaft speed of 1400 rpm were considered. There are simulation of the fault-free condition and two types of faults: the change of fuel injection advance angle and change of the cycle fuel injection to greater and smaller sides from the passport date. For the resulting angular-velocity vectors and acceleration we applied continuous wavelet transform with different basic functions. The obtained results are estimated by energy criteria. The most promising basic functions are separated from the point of view of the most complete estimation of the energy for the portion of the signal carrying diagnostic information.
Using the Self-Braking Method when the Post-Overhaul Diagnostics of Diesel-Hydraulic Locomotives
(Kaunas University of Technology; Publishing House “Technologija“, Kaunas, Lithuania, 2018) Bodnar, Borys Ye.; Ochkasov, Oleksandr B.; Bobyr, Dmytro V.; Koreniuk, Roman O.; Bazaras, Ž.
ENG: A large number of diesel-hydraulic locomotives are operated at industrial enterprises. Reliability of diesel locomotives in operation directly depends on the quality of the conducted acceptance testing of the hydro-transmission after repair. Test procedures presuppose running-in and testing the hydraulic transmission in all modes of its operation. Run-in time is established by normative and technical documentation. During the running-in, the technical condition of the hydraulic transmission is determined on the base of the control of input and output parameters (shafts speed, temperature and oil pressure). The authors propose to improve the running-in process by introduction of tools and techniques of technical diagnostics. With this aim features of post-overhaul diagnostics of diesel-hydraulic locomotive were analyzed. The article deals with the diagnostics the condition of the mechanical part of the hydraulic transmission UGP (UHT- unified hydraulic transmission) 750/120 after a major overhaul. Choosing the diagnostic parameters of the mechanical part of the hydraulic transmission was carried out. We proposed to use free path (self-braking) mode to determine the mechanical losses at bench tests. As the criteria, determining the technical state of the mechanical part of the diesel-hydraulic locomotive during the tests in the self-braking mode, the following values are proposed: run-down time of shafts; change in the braking torque and the power of mechanical losses depending on the angular velocity. Diagnostics of the hydraulic transmission according to the above criteria allows reducing the time of receive/running-in tests and significantly increasing the technical condition accuracy and characteristics of the technical condition.
Автоматизація розв’язання рівняння руху поїзда при виконанні тягових розрахунків
(УкрДАЗТ, Харків, 2012) Капіца, Михайло Іванович; Бобирь, Дмитро Валерійович
UKR: Запропонована методика інтегрування рівняння руху в аналітичному вигляді та надані основні моменти побудови програми тягових розрахунків для користувачів. Досліджена точність інтегрування рівняння руху різними чисельними методами шляхом порівняння результатів рішення з точним.
Автоматизований експертний комплекс із дослідження та прогнозування параметрів силових енергетичних установок локомотивів
(Український державний університет залізничного транспорту, Харків, 2020) Скалозуб, Владислав Васильович; Очкасов, Олександр Борисович; Кібець, Дмитро Вікторович
UKR: У статті досліджено можливості створення та результати застосування автоматизованого експертного комплексу, призначеного для вирішення завдань з удосконалення процесів експлуатації парків локомотивів, що реалізується засобами сучасних інтелектуальних систем. Процедури моніторингу та діагностування забезпечують реалізацію завдань контролю параметрів функціонування силових енергетичних установок локомотивів (СЕУЛ). Комплекс експертної системи (КЕС-СЕУЛ) реалізує базові завдання щодо побудови системи аналізу, діагностування та прогнозування стану СЕУЛ на основі сигналів кутової швидкості обертів колінчатих валів. У КЕС-СЕУЛ завдання експертизи реалізуються шляхом поєднання методів цифрової обробки сигналів, статистичного аналізу, класифікації та використання емпіричних знань експертів. Подано структуру, моделі та результати діагностування СЕУЛ.
Амортизаторы качения как альтернатива гидравлическим
(Хмельницький національний університет, Хмельницький, 2013) Довбня, Николай Петрович; Бондаренко, Леонид Николаевич; Бобырь, Дмитрий Валерьевич; Коренюк, Роман Александрович
RU: С использованием аналитических зависимостей для определения коэффициента трения качения цилиндра по плоскости доказано, что характер затухания колебаний при этом идентичен затуханию при гидравлических амортизаторах.
Аналитические зависимости для определения сопротивления качению конических колес
(Хмельницкий национальный университет, Хмельницкий, 2011) Довбня, Николай Петрович; Довбня, Микола Петрович; Dovbnya, Mikola P.; Dovbnya, Nikolay P.; Бондаренко, Леонид Николаевич; Бондаренко, Леонід Миколайович; Bondarenko, Lеоnid M.; Bondarenko, Leonid N.; Коренюк, Роман Александрович; Коренюк, Роман Олександрович; Korenyuk, Roman А.; Koreniuk, Roman O.
RU: Приведены аналитические зависимости, которые позволяют определить коэффициент трения качения для конических колес подвесных однорельсовых тележек и малоопорных поворотных устройств кранов
Аналитические зависимости для определения сопротивления качению конических колес (препринт)
(Хмельницький державний університет, 2010) Довбня, Николай Петрович; Коренюк, Роман Александрович; Бондаренко, Леонид Николаевич
RU: Приведены аналитические зависимости, которые позволяют определить коэффициент трения качения для конических колес подвесных однорельсовых тележек и малоопорных поворотных устройств кранов.