Influence of yaw dampers on vertical vibration of railway car body induced by wheels rotation and its countermeasures

Vertical vibrations in railway vehicles are not only induced by track irregularity but also affected the rotation of wheelsets with small mass imbalance. It is known that excitation force generated transmitted from bogies to car bodies through longitudinal connecting members such as traction devices and yaw dampers. In this research, we first investigated influence dampers on vertical body vibration wheelsets. Roller rigs tests were performed using a full-scale vehicle with/without cases where there was no damper, lower than equipped. This result indicates transmissibility via should be reduced. order suppress transmission, developed two reduction devices: new mounting structure for having moving beam, displacement-dependent rubber bushes The results roller show reduced car-body caused forces Moreover, conducted running commercial track, applying