Abstract
In order to improve the riding comfort of railway vehicles, it is effective to suppress the vibration of the vertical bending mode. Therefore, the primary suspension damping force control system with variable axle damper is being developed, which can control its damping force continuously. This paper reports how the relationship between the natural frequency of the primary suspension and that of the first bending mode of the carbody influences the vibration reduction performance of this system. Numerical simulations and running tests have been carried out, and the results have shown that the efficiency of vibration suppression is dependent on that relationship.
