Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : August 07, 2016 - August 10, 2016
In urban railway systems, which have numerous sharp curves, countermeasures for wear development are necessary in order to control wheel and rail wear. Thus, it is important to predict the development of wheel wear. However, the observation of wear development in practical systems requires a great deal of time and is not efficient. In order to predict the wheel wear profile, a numerical analysis conducted using multi-body dynamics software is proposed. We herein propose a model for the prediction of wheel wear development by incorporating the proposed model of wear development into SIMPACK. First, based on the motion analysis of the vehicle using SIMPACK, the contact pressure, slip ratio, and other necessary parameters are obtained. In order to create a worn wheel profile using the proposed model, the wear depth is derived. The current wheel profile is updated using the wear profile, and is adopted as the new wheel profile in SIMPACK. The wear depth is calculated based on the wear theory of Archard and Ward. Typical commuter rail vehicles in Japan, which adopt a modified arc wheel profile, are used as the model vehicle in the numerical analysis. A total of 400 nodes placed on the wheel surface at intervals of 0.4 mm are updated by spline interpolation. Wear development in the wheel/rail contact area is calculated, and the nodes are replaced by the calculated wear depth. The validity of the wear coefficient used in the simulation is discussed. The results of the numerical analysis are also compared with the experimental results to discuss the amount of wear from the viewpoint of mechanical and tribological contact problems.
