Abstract
Recently, a car-body tilt mechanism using air springs has een employed even for Shinkansen trains to speed up on curved sections. This air-spring-type tilt mechanism is simple, although the tilt angle is limited in the range of ± 2 degrees. However, on the test train running on Tohoku Shinkansen at a speed of about 300 km/h, it was found that the car-body lateral vibration increased in the curved section with a vertical curve. In this study, an analytical model for the air-spring-type tilt mechanism was developed to clarify the increase in vibration experienced on the test train on a curved section overlapped with a vertical curve. Then, the vertical dampers between the car body and bogies were examined as a countermeasure. It was observed that the vibration phenomenon on the overlapped curve is caused by the vertical centrifugal force due to passage on the vertical curve and the unbalanced stiffness of the right and left air springs during car-body tilting.
