鉄道車両の蛇行動のシミュレーション : 第2報, 円弧踏面車輪を使用した場合

抄録

Rail vehicles must have both good curving performance and stability at high speeds; such vehicles have a compound circular wheel profile, soft suspension of the wheelset and a yaw damper. A detailed dynamic model (31 DOF) for these vehicles was formulated, and general equations of motion were derived considering various nonlinearities such as wheel profile, clearance in wheelset suspension and creep force between the wheel and rail. Digital simulations for a representative example were made. It was shown that the yaw damper had a large effect on improving stability, especially suppressing divergent hunting at higher vehicle speeds. Then, eigenvalue analyses for the linearized model were made and the cause of the above-mentioned effect of the yaw damper was clarified. The influences of some other factors such as clearance in the wheelset suspension and stiffness of the springs inserted in the ends of the yaw damper and lateral damper were also described.