Development and dynamic characteristics of radial bogies

Solving the conflict between curving performance and hunting stability is always a hard work for a long time in the fields of vehicle system dynamics. Using the conventional bogies can not satisfy the both requests in the same time. The radial bogie, which not only meets the request of curving performance but also improves the hunting stability effectively, can solves the conflict. The application and development of radial bogies are briefly introduced, and the principles and structures of force-steering and self-steering radial bogies are expounded. An uniform lateral dynamic model including the force-steering, self-steering and flexible primary suspension bogie is established, and their dynamic characteristics are compared by computer simulation. The analytic results show that adopting radial bogies is an effective measure, which may reduce wheel/rail wear on curve and improve stability on straight. The radial bogie is adapted to the tilting train and the passenger car that is required to improve speed in existing lines of many curves.