Design Method of Tilting Mechanism in Tilting Train

초록

This paper presents the design method of tilting mechanism applied to the Korean tilting train as shown in Fig. 1. In the bogie of Korean tilting train, a tilting bolster and tilting mechanism was installed to support and tilt the car body. The car body is tilted by the roll moment generated by means of a tilting actuator located between the bogie frame and the tilting bolster as shown in Fig. 2. The tilting train is able to increase curving speed by tilting the car body towards the center of curve. That is to say, it can compensate the steady-state lateral acceleration by lateral component of gravitational acceleration which is induced by car body tilting. Therefore application of a tilting train is the most effective ways to reduce the journey time on conventional line with many curves and also without enough budget to construct high speed line. The proposed design method include not only functional analysis of tilting bogie to verify that its required functions should be satisfied but also parametric study to search the optimal design parameters based on kinematics, kinetics and vehicle dynamics. Through the running test on Ho-nam line, it was proved that the prototype Korean tilting train had the sufficient safety both on curves with 30 km/h higher speed than conventional train and on tangent track with 180 km/h. The overall dynamic performances was evaluated as excellent thereby the design of bogie and tilting mechanism was proved to be adequate.