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Prediction of metal PM emission in rail tracks for condition monitoring application
Author(s): B. Tesfa, Fengshou Gu, A. Anyakwo, F. Al Thobiani, A. Ball
Source: 5th IET Conference on Railway Condition Monitoring and Non-Destructive Testing (RCM 2011), 2011, p. 53 - 53
Type: ConferencePaper
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Exposure to particulate material (PM) is a major health concern in megacities across the world which use trains as a primary public transport. PM emissions caused by railway traffic have hardly been investigated in the past, due to their obviously minor influence on the atmospheric air quality compared to automotive transport. However, the electrical train releases particles mainly originate from wear of rails track, brakes, wheels and carbon contact stripe which are the main causes of cardio-pulmonary and lung cancer. In previous reports most of the researchers have focused on case studies based PM emission investigation. However, the PM emission measured in this way doesn't show separately the metal PM emission to the environment. In this study a generic PM emission model is developed using rail wheel-track wear model to quantify and characterise the metal emissions. The modelling has based on Archard's wear model. The prediction models estimated the passenger train of one set emits 6.6mg/km-train at 60m/s speed. The effects of train speed on the PM emission has been also investigated and resulted in when the train speed increase the metal PM emission decrease. Using the model the metal PM emission has been studied for the train line between Leeds and Manchester to show potential emissions produced each day. This PM emission characteristics can be used to monitor the brakes, the wheels and the rail tracks conditions in future. (6 pages)

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Modeling the dynamic behaviour of the wheel rail interface using a novel 3D wheel-rail contact model
Author(s): A. Anyakwo, C. Pislaru, A. Ball, F. Gu
Source: 5th IET Conference on Railway Condition Monitoring and Non-Destructive Testing (RCM 2011), 2011, p. 84 - 84
Type: ConferencePaper
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Methods for multibody modelling and simulation should accurately replicate the dynamic behaviour of rail-wheel interface including precise values for wheel-rail contact positions. This paper studies the development of a novel 3-D wheel-rail contact model which is used for dynamic simulation of a suspended wheelset with parameters listed for a typical Mark IV coach. The contact point locations on the wheel and rail are determined by the minimum difference method considering the lateral displacement, yaw angle and the roll angle. The proposed new 3D wheel-rail contact model can be applied in railway condition monitoring techniques to estimate the wheel geometry parameters and thus to achieve practical optimised wheel-rail interfaces. (6 pages)

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