抄録
This paper presents the effect of support stiffness on the bogie motion of a railway vehicle. Support stiffness is one of the most important factor to suppress hunting on the bogie. The numerical simulation -based on the multibody dynamics is conducted in consideration of the contact geometry between wheel and rail. In this research, motion analysis is performed with assorted combinations of the longitudinal support stiffness and the lateral support stiffness. From this research, the following conclusions were obtained. The critical velocity of hunting becomes maximum when the longitudinal spring force over the lateral spring force becomes maximum. The reasons for this phenomenon include the following. The longitudinal creep force is suppressed by the longitudinal spring force and the lateral creep force. When the longitudinal spring force over the lateral spring force becomes maximum, the longitudinal spring force and the lateral creep force are bigger than any other case because the lateral spring force is minimum. Therefore, the critical velocity of hunting becomes maximum. Furthermore, there are two conditions when the longitudinal spring force over the lateral spring force becomes maximum. One is the case where the longitudinal spring force is bigger than the lateral spring force. The other is the case where the lateral spring force is smaller than the longitudinal spring force. It is turned out that the critical velocity of hunting becomes maximum in the latter case. As a result, in order to increase the critical velocity of hunting on bogie, setting the combination of longitudinal and lateral support stiffness when the longitudinal spring force is bigger than lateral spring force is more effective than when the lateral spring force is smaller than the longitudinal spring force.
