Development of Longitudinal Excitation Suppression Devices for Reducing Car-body Elastic Vibrations in Bullet Trains

This study proposes a method to reduce car body elastic vibrations in bullet trains caused by longitudinal excitation via traction devices and yaw dampers. We devised two vibration reduction devices—"displacement-dependent rubber bushes" and "mesh springs" to suppress the longitudinal excitation force. We conducted excitation tests using a Shinkansen (bullet train) type test vehicle in a rolling stock testing plant to examine the running stability and car body vibrations suppression performance when mounting the developed devices. Subsequently, we confirmed that these devices meet the required performance for running stability and reduce the elastic vibrations in the car body.