The article refers to the importance of the aspect of durability and reliability of wheelsets. It contains a short analysis of railway accidents in which the causes were failures of wheelsets. The paper lists most common faults occurring in the course of the wheelsets operation. The major problem of the paper were laboratory analyses of fretting wear developing in interference joints. The research has been conducted using a wheelset comprising a shaft and a sleeve. Fatigue tests in conditions close to the wheelset operating environment have been conducted. The laboratory analyses included macroscopic observation that indicated fretting wear signs on both sides of the wheel seat in form of a 3.5 mm wide ring around the entire perimeter. The following procedures included microscopic observations in the wear signs area, that indicated numerous material accumulations exposed to plastic deformation and oxidation.
Technological problems in machining of resilient wheelsets on wheel-turning lathes with friction drive
Article presents attempt of identification of technological problems in machining of resilient wheelsets on wheel- turning lathes with friction drive. Main part of presented research was modelling of machined wheel using finite elements method in conditions of load with forces measured during machining of railway wheelsets. Presented research is a part of works performed in order to enable regeneration of tyre profiles of resilient wheelsets using wheel-turning lathes with friction drive, which are commonly used nowadays for machining heavy railway wheelsets.
The train velocity is difficult to determine when the velocity is measured only on the driven or braked locomotive wheelsets. In this case, the calculated train velocity is different from the actual train velocity due to slip velocity or skid velocity respectively. The train velocity is needed for a locomotive controller proper work. For this purpose, an adaptive filter that is tuned by a fuzzy logic is designed and described in the paper. The filter calculates the train longitudinal velocity based on locomotive wheelset velocity. The fuzzy logic is used for the tuning of the filter according to actual wheelset acceleration and wheelset jerk. The simulation results are based on real measured data on a freight train. The results show that the calculated velocity corresponds to the actual train velocity.
uogólnionych układów dynamicznych. Wydawnictwa IMP PAN, Gdańsk, 2008. Nowak A., Sitarz M., Verbicki W.: Analysis of Brake - Wheelset Railway Dynamics Turing the Motion, Mechanika 2004, Nr 2 (46), str. 52 - 59 Grant KBN Nr 4T12C 03524 "Projekt szybkich połączeń kolejowych w Polsce w ramach europejskiego systemu transportowego" . Smalko Z. (2007): Charakterystyki spolegliwości układu człowiek-maszynaotoczenie. Materiały Szkoły Niezawodności PAN, Wydawnictwo ITE, Radom 2007. Sweedler B. (2007): Improving Transportation Safety - the Integrated Multimodal Approach. First
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