Justification of parameters of wheelset axle fatigue strength test-bench for railway rolling stock

The operation safety of the railway rolling stock depends directly on the strength of the base part of the wheelset – its axle. Therefore, in recent years numerous studies of theoretical and experimental nature, both for means of rail transport, and for machines containing rail track equipment are carried out. This paper substantiates the main parameters of the fatigue test bench for axles for wheelsets of railway rolling stock. We performed an analysis of the load schema for bench tests, determined the dependence of the bench work force on the parameters of the wheelset axle. In addition, we substantiated the design and parameters of vibrator. For the research, we adopted the following criteria of rationality: work force, energy consumption and longitudinal dimension of the test bench. The design is considered the best, if these criteria acquire the smallest values. The results of the research indicate that the load scheme “cantilever beam” is rational for the fatigue bench tests of the axles for wheelsets of railway rolling stock. The best design of the vibrator have to provide the test bench work force by rotating the unbalanced mass around the stationary wheelset axle. The rational vibrator contains a sectoral eccentric mass rotating at an angular velocity of about 150 s-1. In this case, the eccentric mass value is about 80 kg, and its eccentricity is 135 mm.

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The Assessment of Energy Efficiency versus Planning of Rail Freight Traffic: A Case Study on the Example of Poland

Energies ◽

10.3390/en14185629 ◽

2021 ◽

Vol 14 (18) ◽

pp. 5629

Author(s):

Piotr Gołębiowski ◽

Marianna Jacyna ◽

Andrzej Stańczak

Keyword(s):

Energy Efficiency ◽

Energy Consumption ◽

Negative Impact ◽

Rail Transport ◽

Rolling Stock ◽

Railway Network ◽

Rail Freight ◽

Freight Traffic ◽

Efficient Planning

The issues addressed by the article concern the assessment of energy efficiency in rail transport, resulting from the proper organization of rail traffic. The problems related to energy consumption and, thus, the negative impact of rail transport on the natural environment are highly significant in terms of the green deal concept, climate change and sustainable development. In this article, energy efficiency is investigated in the context of minimizing the energy consumption necessary to satisfy a specific transport requirement. The essence of this article is to present an approach to energy-efficient planning of rail freight traffic. This article aims to develop a method covers the allocation of railway vehicles dedicated to freight traffic (locomotives and railcars) to perform a defined transport task, taking into account the energy efficiency assessment of the solution, routing the train launched with regard to the accomplishment of the defined transport task on the railway network, and determining the conditions of transport for a defined transport task, taking into account the allocated rolling stock (locomotives and railcars) and the route. In this article, based on the presented state of knowledge, a decision-making model has been proposed, including the model’s parameters, the values being searched for, indicators for assessing the quality of the solution, as well as the limitations and boundary conditions of the problem. The function of minimizing the energy consumption necessary to transport a shipment within the railway network (determining the energy efficiency of the proposed solution) has been proposed as the criterion. In addition, a description of the proprietary method of selecting rolling stock for accomplishing tasks, based on the assessment of the energy efficiency of the solution and a case study illustrating the operation of the method on the example of the area of Poland, has been presented.

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Thermal modes of operation of power-current contact of electric transport during conduct of bench tests

Electrical Engineering and Power Engineering ◽

10.15588/1607-6761-2021-2-2 ◽

2021 ◽

pp. 17-24

Author(s):

А.М. Mukha ◽

D.V. Ustymenko ◽

Mohammad Al Said Ahmad Diab

Keyword(s):

Electric Vehicles ◽

Test Bench ◽

Heating Time ◽

Sliding Contact ◽

Rolling Stock ◽

Final Test ◽

Relative Temperature ◽

Bench Tests ◽

Contact Wire ◽

Test Result

Purpose. Analysis of the results of bench tests of sliding electrical contacts of electric vehicles, in order to determine the thermal regime of the sliding contact. Methodology. The initial data were obtained during field experiments on a specialized stand in the laboratory, which were carried out to determine the wear of the contact wire inserts of different types for pantographs of electro-rolling stock of railways. To determine the contact wire temperature at the place of sliding contact, a non-destructive non-contact method of control using a thermal imager was used. Findings. During the experimental part of the research, the thermal imaging photographs were obtained, they recorded the temperatures at the place of sliding contact between the insert of the pantograph of the electric rolling stock and the contact wire installed on the test disk. These temperature values were recorded with a certain time interval, which allowed to build the dependences of changes in thermal regime over time, to determine the heating time constant of the "insert-contact wire" of the test bench and to obtain the final temperature value at the end of tests. Accepting the insert sample in which the minimum temperature in the area of sliding contact is as a reference, it becomes possible by the value of the temperature of the contact wire in the area of sliding contact to predict the final test result of other types of pads. Originality. Indicators of temperature modes of sliding contact of electric vehicles during bench tests are obtained for the first time, the proposed relative temperature indicator allows to predict the results of bench tests of qualitative indicators of sliding contact of electric vehicles.. Practical value. Bench tests of inserts of current collectors of electric vehicles are a long procedure, the normative indicator of the number of passes of the current collector on the stand is equal to 500 thousand passes, which requires significant expenditure of time, energy, human resources and others. The indicators proposed according to the test results, namely the heating time constant and the relative temperature index, allow to carry out two-stage tests. At the first stage, with a duration of 10 thousand revolutions of the test bench disk, the proposed indicators are determined and compared with the corresponding reference, in case of their compliance it becomes possible to predict the final test result as successful (contact wire wear less than normal) or unsuccessful. In the latter case, the need for the second stage of testing up to 500 thousand revolutions is questionable, because the end result will be negative, and the significant resources will be involved in the test, and therefore these tests are impractical.

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Specification and verification of energy consumption for railway rolling stock

10.3403/30251573u ◽

2015 ◽

Keyword(s):

Energy Consumption ◽

Rolling Stock ◽

Specification And Verification ◽

Railway Rolling Stock

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Specification and verification of energy consumption for railway rolling stock

10.3403/30251573 ◽

2014 ◽

Keyword(s):

Energy Consumption ◽

Rolling Stock ◽

Specification And Verification ◽

Railway Rolling Stock

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The Theft of Cargo of Railway Rolling Stock: Issues of Criminal Characterization and Investigation

Rossijskoe Pravo. Obrazovanie, Praktika, Nauka ◽

10.34076/2410-2709-2019-3-25-30 ◽

2019 ◽

pp. 25-30

Author(s):

Denis Grishin ◽

Mariya Vilacheva ◽

Irina Soshnikova

Keyword(s):

Russian Federation ◽

Rail Transport ◽

Rolling Stock ◽

Legal Literature ◽

The Subject ◽

The Russian Federation ◽

Definition Of ◽

Railway Rolling Stock

In the academic and educational criminal and legal literature, special attention is paid to crimes committed on rail transport. The statistics provided by the official website of the Prosecutor General’s Office of the Russian Federation confirms that the majority of these crimes are thefts. In the study, the issues of characterization of these crimes are analyzed, as well as their elements. Particular attention is paid to the subject of the crime: in most crimes it is special, and this also affects the characterization of such theft. Given the variability of approaches to qualifying of thefts, the authors propose their own definition of such theft. The methods of investigation of the above-mentioned thefts are examined. The authors cite various investigative situations arising on different stages of investigation and note that the characterization of theft of cargo of railway rolling stock, as well as determination of the range of people potentially involved in the crime, depends on where, when and how it was committed, what are the amount and the value of the property stolen, and whether the crimes are multiple.

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