Railcar damping device

A railcar damping device that suppresses vibration of a vehicle body by determining a thrust to be output by an actuator as a thrust command value and controlling the actuator,

• wherein the actuator comprises:
• a cylinder coupled to one of a truck and the vehicle body of a railcar;
• a piston inserted into the cylinder to be free to slide;
• a rod inserted into the cylinder and coupled to the piston and the other of the truck and the vehicle body;
• and
• a rod side chamber and a piston side chamber defined within the cylinder by the piston,
• wherein the railcar damping device comprises:
• a tank that is configured to store a liquid that is supplied to and discharged from the cylinder;
• a first opening/closing valve provided in a first passage connecting the rod side chamber to the piston side chamber to be capable of opening and closing the first passage;
• a second opening/closing valve provided in a second passage connecting the piston side chamber to the tank to be capable of opening and closing the second passage;
• and
• a pump that is configured to be driven to rotate at a predetermined normal rotation speed in order to supply the liquid from the tank to the rod side chamber,
• wherein a rotation speed of the pump is reduced when the thrust command value is smaller than a normal lower limit value, which is a lower limit value of a thrust that can be generated by the actuator when the pump is rotated at the normal rotation speed.