Wyniki wyszukiwania - BazTech

1

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.

2

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.

3

Improving of operating ability of wheels and rail tracks

Tumanishvili G, Nadiradze T, Tumanishvili I

Transport Problems

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2014

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T. 9, z. 3

99--105

EN

The high cost of wheels and rails due to wear and rolling contact fatigue is one of the main problems in the railway transport. The values of creepage, sliding distance and wear rate of wheels and rails at rolling of a wheel on the rail greatly depend on geometric characteristics of working profiles of wheels and rails and location of wheels relative to rails. In the present work the functional requirements of various parts of profiles of wheels and rails and dominating kinds of their damage in various operating conditions are considered and a new profile of a wheel and device for fastening of rails are offered.

RU

Высокая стоимость ремонтно-профилактических работ колес, из-за износа и усталостного повреждения является одным из главных проблем на железодорожном транспорте. При качении колеса на рельсе величина относительного скольжения и интенсивность изнашивания колес и рельсов значительно зависят от геометрических особенностей рабочих профилей колес и рельсов и взаимного расположения рельсов относительно колес. В данной работе рассматриваются функциональные требования различных частей профилей колес и рельсов и доминирующие виды их повреждения при различных условиях работы и предложены новые профили колес и устройства закрепления рельсов.

4

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

Gola A., Kleban K., Zboiński K.

Prace Naukowe Politechniki Warszawskiej. Transport

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2007

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z. 63

83-91

PL

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.

EN

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.

5

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.

6

Profiles synthesis through radii variation of arcs profile

Gerlici J., Lack T.

Archives of Transport

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2006

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Vol. 18, iss. 3

37-56

EN

The articIe deals with one of the ways of profile geometry design of a railway wheel and rail. The base for the creation of a new profile is an interactive attitude based on the modification of "the original shape which is defined by section of a railway wheel profile", with mutually connected and exactly defined ares radii. It is possible to change them according to shape needs of the final geometrical characteristics.

PL

Niniejszy artykuł rozważa jeden ze sposobów projektowania profilu geometrycznego koła pociągu oraz szyn. Podstawą stworzenia nowego profilu jest interaktywne podejście oparte na modyfikacji oryginalnego kształtu, który jest zdefiniowany przez przekrój profilu koła pociągu wraz z wzajemnie połączonymi i dokładnie zdefiniowanymi promieniami łuku. Możliwa jest jego zmiana zgodnie z wymaganym kształtem końcowej charakterystyki geometrycznej.

7

Sterowanie zestawem kołowym obniża poziom hałasu

Kwasnicki E.

TTS Technika Transportu Szynowego

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1998

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R. 5, nr 4

23-29

PL

Problemy związane z ruchem pojazdu szynowego w łukach torowych pojawiły się już w okresie powstania pierwszych kolei żelaznych. Podczas gdy przy budowie pierwszej dalekobieżnej kolei w Niemczech z Lipska do Drezna w 1839 roku uważano jeszcze za konieczne zachowanie promieni łuków toru od 2500 do 3000 m, Guido Brescius realizował już w latach 1856-1857 przy budowie Hahnichener Kohlebahn, póżniejszej kolejki górskiej Windbergbahn, wytyczanie trasy z 25% wzniesieniem i łukami o promieniu 110 m, w przypadku ekstremalnym o promieniu 85 m.