A non-Hertzian wheel-rail contact model considering wheelset yaw and its application in wheel wear prediction

摘要

To obtain a relatively accurate wheel-rail contact solution with less time consuming, some so-called fast-accurate methods based on the concept of virtual penetration were provided by researchers. When dealing with the non-Hertzian contact problem with a sharply changing lateral relative curvature, it may be incorrect to calculate the penetration by the Hertzian contact parameters of the initial contact point. This paper proposes a method to get a proper penetration by considering the change of local relative curvature of wheel-rail profiles based on the semi-Hertzian method. Furthermore, the wheelset yaw angle is considered by using the 'Trace line method' to get a twisty contact patch which is verified by the program CONTACT. Finally, the proposed method is applied for the wheel wear prediction of a high-speed train. Field tests are carried out to determine the wear coefficient for wheel-rail contact of the high-speed train and to validate the wheel wear prediction model.