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1

Testing the wear of wheelsets of EN97 series vehicles in terms of geometrical parameters of the wheel profile in two-year operation

Sawczuk Wojciech, Cañás Armando Miguel Rilo, Kołodziejski Sławomir

Pojazdy Szynowe

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2023

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Nr 1-2

38--45

EN

The article presents the results of wheel wear tests of selected EN97 series electric multiple units. In the tests carried out on the 14 vehicles mentioned above, which were driven on the same route, geometrical parameters of the profile of all wheels were recorded during periodic inspections. The analyzed data concerned the period of over two years of use, when the vehicles were delivered from the manufacturer to the carrier as new. In the form of graphs, cases of exceeding a given parameter in relation to the requirements set in the Maintenance System Documentation are presented, broken down into individual wheelsets. The article presents the results of operational tests, which show which wheel set parameters (wheel diameter, rim steepness, rim thickness, rim height, etc.) are most often exceeded and which are least. The analyzes of the geometric parameters of the wheel profile on the tested group of vehicles, which were used on the same route in the same period, clearly prove that the parameters most often exceeded are wheel diameter and rim steepness. These two exceeded parameters were the basis for turning the wheelsets.

2

Examination of selected geometrical parameters of wheelsets of electric multiple unit

Grzywna Maciej, Szkoda Maciej

Transport Problems

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2022

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T. 17, z. 2

161--174

EN

The aim of the work is to investigate changes in the values of selected geometrical parameters of electric multiple unit (EMU) wheelsets as a function of mileage. Based on the conducted analysis of the literature, it was found that the problem of proper diagnostics and maintenance of wheelsets, as an element that directly affects the level of safety of railway vehicle traffic, is very up-to-date and justified. This work presents the characteristics of the geometrical parameters of the wheelset that were subjected to the tests. According to the terminology of EN 13715:2020-12, the geometrical parameters of the wheelset subjected to tests were characterized. As part of the research work, data from measurements of the values of the main geometrical parameters of the outer contour of the wheelsets were collected and systematized from 204 measurement sheets of vehicles. Data were collected from specially developed registers and databases. The research and analyses confirm the existence of a correlation between changes in the values of diagnostic characteristics of flange thickness and height and flange steepness as a function of kilometrage. The intensity of wheel rim wear changes depending on the conditions under which the vehicle is operated. The wheelsets’ diagnostic characteristics were not fully predictable, which makes it difficult to forecast their future values. Based on the obtained results, actions that increase the durability of the wheels were proposed. For example, it is reasonable to assign vehicles to different routes so that the wheel rims wear evenly, eliminating the need for the subsequent accumulation of repairs and wheelset replacements before repair at the P4 level. Moreover, it is advisable to undertake work on the change of identification of basic individual primary characteristics of the wheel’s external contour into primary characteristics of a collective nature. As a result of such action, it is possible o indicate the probability of occurrence of non-uniformity of values of diagnostic characteristics on the wheel circumference could be limited and the phenomenon of occurrence of measurement errors could be minimized.

3

Correlation between the main diagnostic features of rail vehicles’ wheel profiles in the operational period

Brzeźny Andrzej, Potępa Piotr, Sowa Andrzej

Problemy Kolejnictwa

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2019

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Z. 183

99--105

EN

The paper is dedicated to correlations between the main diagnostic features utilised for assessing the wear of wheel tyre running treads and the wear of wheel flanges. The paper focuses on analysis of the correlations between these features in the period between the mounting of new wheel tyres or new monoblock wheels in a given wheelset up to their replacement. The wheels of Electric Multiple Units and shunting locomotives were the objects of the research. The measurement data obtained from a domestic railway undertaking contain, however, many errors. It was noted that in some cases the measured values were put in the wrong places on the measurement cards. It is also possible that in some cases the wheel surfaces were not prepared properly for measurements. For those reasons, only some data, for which there were no doubts regarding credibility, were chosen. Those data were appropriate for determining the trend line equations, which depict an overview of how the values of the diagnostic features are correlated with each other. The obtained functions of the characteristics of the changes in the diagnostic features as well as calculated Pearson correlation coefficients show that there is a significant correlation between those features. This is not dependent on the significantly different operational conditions of the groups of tested rail vehicles. Conclusions on the existence of significant correlations between the tested features can be used for the creation of innovative solutions dedicated for wheel diagnostics of rail vehicles. This especially applies to the design of analytical functions, which could be used for real time verification of the correctness of the measurement results.

4

Proposal to modify the wheel profile of Poznan Fast Tram

Finke S., Piechowiak T., Bryk K., Sienicki A.

Pojazdy Szynowe

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2016

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Nr 4

46--54

EN

PFT tram wheel profile is considered the standard profile in Poland. Despite its modern design this profile, in combination with the most commonly used rail profiles in Poland it may lead to instability, even at regular operating speeds. Although the relationship between Y/Q forces is not at a dangerous level in these cases, it leads to the increase in wheels and rails wear and the deterioration of the tram operating properties. The influence of selected, possibly small PFT profile modifications, was analyzed. These modifications were made to increase the stability on a variety of rails, an analysis of these modifications on the hypothetical process of wear of wheel/rail parts was also performed.

PL

Profil koła tramwajowego typu PST jest profilem objętym normą obowiązującą w Polsce. Pomimo nowoczesności tego profilu, w skojarzeniu ze stosownymi często w Polsce profilami szyn może on wykazywać niestabilność nawet przy eksploatacyjnych prędkościach jazdy. Pomimo, że nie występuje w tych przypadkach niebezpieczny poziom stosunku sił Y/Q, to wpływa to na zwiększenie zużycia kół i szyn oraz na pogorszenie właściwości biegowych tramwajów. Zanalizowano wpływ wybranych, możliwie małych modyfikacji profilu PST, dokonanych w celu zwiększenia stabilności na różnych szynach, dokonano również analizy tych modyfikacji na hipotetyczny proces zużywania elementów koło-szyna.

5

Symulacyjne badania zużycia profili kół tramwaju poruszającego się w łukach o małych promieniach

Opala M.

Logistyka

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2015

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nr 4

759--766, CD1

PL

W artykule przedstawiono badania wpływu prędkości jazdy i promienia łuku toru na wielkość zużycia profili poprzecznych kół tramwajowych typu PST, współpracujących z tramwajowymi szynami rowkowymi typu Ri60N. Do obliczeń wykorzystano model pięcioczłonowego lekkiego pojazdu szynowego, poruszającego się z niewielką prędkością po torze zawierającym łuk o małym promieniu bez krzywej przejściowej i bez przechyłki.

EN

The article presents a study on the influence of the running speed and radius of the track, on the size of the wear of transverse profiles of tram wheels PST type, interacting with grooved tram rail Ri60N type. Model used for the calculations represents a five unit light rail vehicle, moving at low speed along the track containing the arc with a small radius without transition curve and without cant.

6

Automatic detection of flats on the rolling stock wheels

Madejski J.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 16, nr 1-2

160--163

EN

Purpose: The goal of this work was increasing safety of tram, metro and trams operation. Design/methodology/approach: The accelerometers were fixed directly to the rail to provide the system with the best defect signal quality. Analysis of the acoustic signals collected using microphones proved that too much of the background noise limited their usefulness. Findings: It has been proven that all wheel geometry defects can be reliably detected and classified according to the experimentally established defect categories. Research limitations/implications: Exact measurements of the wheel defect geometry may be possible only after collecting huge signals time series along with the wheel measurements taken with other methods to reveal the relationships between them. This goal is hard to achieve, as the system performs already very well, and such experiments would be very costly and time consuming. Practical implications: Integrated wheel geometrical data collected from the wheel ovality, flat spots, and build-up detection system along with the wheel profile information have eliminated all derailments due to faulty wheel geometry. Originality/value: The system presented is the first wheel monitoring application in Poland, its unique feature is that it can be used at low speeds, like those allowed in depots.