A predication of wheel/rail lateral force induced by actively controlled suspension for high speed railway vehicles

摘要

Instead of good effects on the ride comfort, the active suspension may have unfavourable effects on the wheel/rail interaction such as the increase of wheel lateral force. This paper deals with an analytical study about the lateral dynamics of two types of railway vehicle, in which an active suspension mechanism controls the running vibration. One vehicle type has trucks with bolster and side bearers, and the other type does bolster-less trucks with yaw dampers. The analytical models for thevehicles consider non-linear characteristics such as creep forces and wheel/rail side collision. In this study the active suspension has a controller based on the optimal control theory and assumes ideal actuators to be available. Their operations on atrack with alignment irregularities are simulated up to the speed of 350 km/h. The results show that the active suspension can improve the ride quality without any increase of wheel lateral force, and that the bolster-less truck is favourable for activesuspension in the range of higher operation speed.