This report presents a vibration suppression technique for flexural vibration of carbody by using carbody-truck interaction. It is shown from a running test result for an actual Shinkansen vehicle that the flexural vibration can be greatly reduced when the rigidity of carbody-truck connecting elements in the longitudinal direction (i.e., rubber bush rigidity of traction links and anti-yaw dampers) K_x is set at the optimum value. The basic mechanism of such vibration reduction effect is studied theoretically. As a result, it is found that the truck frames and wheelsets act as dynamic vibration absorbers against the flexural vibration of carbody. A formula to adjust the K_x to its optimum value is derived. Furthermore, the condition to suppress the excitation due to truck pitching motion is also presented.

Copyright (c) 2003 Railway Technical Research Institute