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Examination of selected geometrical parameters of wheelsets of electric multiple unit

100%

Grzywna M. , Szkoda M.

2022

tom T. 17, z. 2

161--174

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.

Pomiary i analiza geometrii zarysów szyn i kół tramwajowych o różnym okresie eksploatacji w aspekcie ich wzajemnej współpracy

67%

Gola A. , Kleban K. , Zboiński K.

tom z. 63

83-91

Celem prac opisanych w artykule jest analiza warunków współpracy pary koło-szyna w warunkach tramwajowych. Przedstawiono wyniki wstępnych pomiarów profili szyn i kół o różnym stopniu zużycia wykonanych w przedsiębiorstwie Tramwaje Warszawskie. Pomiary szyn wykonano przy pomocy profilomierza laserowego, a pomiary kół - wodzikowego. Dodatkowo przedstawiono krótką charakterystyką nominalnych profili szyn i kół stosowanych w tramwajnictwie. We wnioskach sformułowano wytyczne systematycznego programu pomiarów kół i szyn tramwajowych z myślą o poprawie warunków współpracy w przyszłości. Nakreślono plan dalszych badań w tym kontekście.

The aim of this paper is analysis of wheel-rail interaction in tramway conditions. Results of the initial measurements, made in the Tramwaje Warszawskie company, of rail and wheel profiles at different stage of their wear are presented. The measurements of rail profiles were done with use of the laser instrument, while those of the wheels with use of the slider one. In addition brief characteristic of the nominal profiles used in tramways is included. In the conclusion authors formulated guiding rules for the systematic program of tramways' wheel-rail profiles measurements for future betterment of the pair interaction. Plan of the further studies in this context was outlined, too.

Proposal to modify the wheel profile of Poznan Fast Tram

67%

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

tom Nr 4

46--54

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.

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.