Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies"

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ISSN / EISSN : 2617-9040 / 2617-9059
Total articles ≅ 156
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A. Krasheninin
Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies", Volume 1, pp 76-85; https://doi.org/10.32703/2617-9040-2021-37-9

Abstract:
Modern vehicles operated on the railways of Ukraine have almost exhausted or exceeded their resource. The overuse of financial and material resources for their maintenance continues. The standard service life of vehicles was calculated on stable economic conditions of use of vehicles and their timely updating in process of aging. The service life of modern vehicles is determined by the influence of many factors, the disregard of which can lead to significant costs, even in compliance with the standard service life. For railway transport, these factors need modern clarification, as in operation their service life often exceeds the standard or, as for intermodal transport, the service life does not have a strict justification. Accordingly, the article analyzes the issues of assessing the impact on the service life of vehicles of the components of the cost of its maintenance and average daily mileage. It is shown that, firstly, the definition of the service life of vehicles must be linked to the cost of vehicle development, its creation, testing and production, the cost of operation and storage, as well as additional costs, and secondly , with the optimal average daily mileage, at which all the costs are minimal.
R. Domin
Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies", Volume 1, pp 173-186; https://doi.org/10.32703/2617-9040-2021-37-17

Abstract:
The article presents the principles of the method of operational investigation of rolling stock derailment. This method is intended to identify the most significant mechanical reasons for transport accidents in order to find directions to further improving the safety requirements for the state of maintenance of freight cars and tracks on the basis of the data. The developed method establishes a general methodological order of conducting computer simulation of the dynamics of rolling stock of multivariate studies on calculating the safety indicators of train’s motion, and shows the significance of technical factors that provoked a certain event. By this method, the operational investigation of rolling stock derailment is based on the development of adequate computer models of dynamics of cars in trains. In this case, in detail, all the features of the car, which descended from the rails, are first. The presented method is based on the principles of factor analysis, where the intervals of varying events are presented in natural units of measurement. In this case, the assessment of security indicators for each research of the experiment plan is also carried out taking into account their dimension. As a result, the function of multiple regressions on the chosen indicator of motion safety allows not only to determine the significance of the factor of the ascent, but also to establish the level of factors, with exceeding the criteria for motion safety, that is, to determine the boundaries of the region with an acceptable level of motion safety.
L. Tymchenko
Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies", Volume 1, pp 144-155; https://doi.org/10.32703/2617-9040-2021-37-14

Abstract:
Considered modern problems of laser image processing. An analysis of existing solutions and recent research in the field of image processing of laser beam. Determined that the latter solutions have a number of disadvantages in terms of increasing the speed and density of information flow. There are also problems with excessive power consumption during image processing due to excess power. Also presented method of processing image of laser beam with the use of FPGA and parallelhierarchical transformation. Performing simulation modeling of methods for processing the coordinates of laser beam spots and its results are presented. Presented comparison of the results of image processing using a personal computer and using FPGA. The obtained results allow to evaluate the efficiency of FPGA application and methods with the use of parallel-hierarchical transformation during image processing of laser beams. Due to low power consumption and efficient image processing using FPGA and parallelhierarchical transformation - this technology has great prospects for use in the automotive industry. It can be used to improve the development of unmanned vehicle control, especially for electric vehicles.
O. Gertsiy
Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies", Volume 1, pp 130-143; https://doi.org/10.32703/2617-9040-2021-37-13

Abstract:
The main characteristics of graphic information compression methods with losses and without losses (RLE, LZW, Huffman's method, DEFLATE, JBIG, JPEG, JPEG 2000, Lossless JPEG, fractal and Wawelet) are analyzed in the article. Effective transmission and storage of images in railway communication systems is an important task now. Because large images require large storage resources. This task has become very important in recent years, as the problems of information transmission by telecommunication channels of the transport infrastructure have become urgent. There is also a great need for video conferencing, where the task is to effectively compress video data - because the greater the amount of data, the greater the cost of transmitting information, respectively. Therefore, the use of image compression methods that reduce the file size is the solution to this task. The study highlights the advantages and disadvantages of compression methods. The comparative analysis the basic possibilities of compression methods of graphic information is carried out. The relevance lies in the efficient transfer and storage of graphical information, as big data requires large resources for storage. The practical significance lies in solving the problem of effectively reducing the data size by applying known compression methods.
E. Shikula
Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies", Volume 1, pp 119-129; https://doi.org/10.32703/2617-9040-2021-37-12

Abstract:
A model of deformation of multidirectional reinforcement fibrous materials with differently oriented fibers is proposed. The solution to the problem is built in two stages. At the first stage, the known properties of fibers and binder are used to determine the effective thermoelastic properties and stress-strain state of the subsystem with fibers oriented in a certain way relative to the main coordinate system. It is based on stochastic differential equations of the physically nonlinear theory of elasticity using the method of conditional moments. At the second stage, using a given distribution function based on the Voigt scheme, a model of deformation of the entire system is constructed from the calculated properties of the subsystems. Strain curves are obtained for simple loading, and the deformation of materials at uniform orientation of fibers is investigated. It was found that a fibrous composite material with differently oriented fibers in a macrovolume is isotropic, and its effective thermoelastic constants substantially depend on the volumetric content of fibers.
N. Radkevich
Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies", Volume 1, pp 50-58; https://doi.org/10.32703/2617-9040-2021-37-6

Abstract:
The article examines the residual life of load-bearing metal structures (NMC) of special cars for the transportation of special contingent on the basis of the results of technical diagnostics and standard tests. Most scientific publications investigate the increase in the service life of different types of passenger cars by improving their design properties. The following methods are used in the study: resetting from wedges, resource tests for impact strength, impact tests, static strength tests. On the basis of carrying out technical diagnostics and standard tests the possibility of establishment of new appointed service life of cars is defined. The residual resource was set at one of the minimum calculated values obtained by mathematical dependence to calculate the residual service life. When determining the residual resource during the standard tests, the evaluation of the fatigue resistance margin was performed taking into account the stress of the load-bearing structures of the car during the tests. It is concluded that the condition of load-bearing metal structures of special wagons for transportation of special contingent after long operation does not approach the limit. The obtained practical and theoretical results make it possible to extend the service life of special wagons for the transportation of special contingent beyond the established by the manufacturer.
A. Mironovich
Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies", Volume 1, pp 12-20; https://doi.org/10.32703/2617-9040-2021-37-2

Abstract:
The article describes the production and use of crushed stone in Ukraine. The price factor of production and sale of crushed stone in the foreign countries is given and the comparative analysis with the Ukrainian producers is carried out. The dynamics of capacity and production of crushed stone products in Ukraine taking into account export and import components is given. It is established that the most capacious market is located in Zhytomyr region. It is noted that the share of crushed stone production of the enterprises located on the territory of the Regional Branch "South-Western Railway" is 44. It was found that only fruitful cooperation between two parties will get positive results, which will certainly increase railway traffic.
O. Gorobchenko
Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies", Volume 1, pp 187-195; https://doi.org/10.32703/2617-9040-2021-37-18

Abstract:
The introduction of intelligent locomotive control systems requires better approaches to assessing and monitoring the current train situation than those used in modern traction rolling stock. Automatic detection of complex abnormal situations is currently not provided. For example, determining the inefficiency of the brakes, speeding, the presence of obstacles or people on the track, the deterioration of the traction properties of rolling stock, etc. relies solely on the driver of the locomotive. Given the important impact of these factors on traffic safety, it is proposed to include in the functions of automated and intelligent traffic control systems recognition of abnormal situations and notification of its occurrence. When driving a train, all objects of classification (train situations) are divided into a finite number of classes. A finite number of precedent objects are known and studied for each class. The task of pattern recognition is to assign a new recognizable situation to a class. The classifier or decisive rule is the rule of assigning the image of a train situation to one of the classes on the basis of its vector of features. An order of classification of train situations has been developed, which allows to allocate clusters of any complex shape, provided that different parts of such clusters are connected by chains of close to each other elements. The measure of difference is the square of the Euclidean distance.
I. Kulbovskyi
Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies", Volume 1, pp 196-203; https://doi.org/10.32703/2617-9040-2021-37-19

Abstract:
The article considers the problems of quality management of repair and operation of technical means in projects of development and maintenance of transport infrastructure, which is the most important factor in improving living standards, economic, social and environmental safety. The project quality management system and planning methodology are considered. It is investigated that in order to improve this system it is necessary to solve the problem of integration of quality management principles and their adaptation to transport infrastructure projects on quality management of repair and operation of technical means and the ways of solution are shown. A set of interrelated organizational and technological tasks and measures aimed at restoring the normative transport and operational indicators of repair and operation of technical means of transport is considered. It is investigated that the process of project quality assurance at the level of quality management in transport infrastructure projects consists of the adoption of planned systematic measures to ensure the implementation of all envisaged processes. On the basis of researches the system model of criteria by means of which it is possible to define system efficiency of development and realization of the corresponding projects of transport infrastructure is offered. As a result of solving this problem, a model of management and decision support for diagnostics of technical means in transport infrastructure projects has been developed, which opens prospects for planning and timely maintenance and repair of technical means of transport to ensure and improve traffic safety.
O. Fomin
Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies", Volume 1, pp 68-75; https://doi.org/10.32703/2617-9040-2021-37-8

Abstract:
Currently, a significant number of units of specialized cars of 1520 mm gauge in Ukraine has a service life that exceeds that assigned by the manufacturer. At the same time, many years of experience in diagnosing and analyzing the operation of carts of these cars by specialized organizations, shows that their technical condition after long operation shows that the specified service life specified in the technical conditions in most cases far from the limit. This is largely due to the significant margin of safety, which is laid down in the design, and the peculiarities of the operation of a particular type of car. The paper considers the issues of assessing the operation of such cars on the example of the carriage of the weighing car, bogie model 18-102, and the carriage of the passenger car model KVZ-TsNII used in the track economy for transportation of workers. The average daily mileage of such cars is 60-70 percent less than the average mileage that is laid down when calculating the service life assigned by the manufacturer. The evaluation and methods of determining the strength of the frames of carriages of special cars are performed. Conclusions are made based on the results of the analysis of the strength of the carriages of special cars.
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