Influence of anti-roll damper between cars on vertical vibration of rolling stock

It is important to control the vibration of the car body and maintain good ride-comfort especially on high-speed railway. This paper focuses on the vertical vibration of car body. The vibration modes and intensities of actual running rolling stock were analyzed using the Tokaido-Shinkansen as an example. The results showed that the anti-roll damper between cars causes bending vibration peaks at a frequency lower than the first natural bending eigenvalue of the car body. Therefore, we developed a multi-body vehicle dynamics simulation model that can simulate a train set and clarified the vibration mechanism caused by the anti-roll damper between cars. Specifically, it was found that bending vibrations caused by the anti-roll damper between cars occur in the following two cases. The first case occurs when the following two conditions overlap. The first condition is that the even multiple of the half-wavelength of the longitudinal irregularities is close to the distance between the two bogies, and the front and rear bogies are vibrating up and down in the same phase. The second condition is that the odd multiple of the half-wavelength of the longitudinal irregularities is close to the distance between the vehicle centers, and the neighboring vehicles are vibrating up and down in the opposite phase. And the second case occurs when the following two conditions overlap. The first condition is that the odd multiple of the half-wavelength of the longitudinal irregularities is close to the distance between the two bogies, and the front and rear bogies are vibrating up and down in the opposite phase. The second condition is that the even multiple of the half-wavelength of the longitudinal irregularities is close to the distance between the vehicle centers, and the neighboring vehicles are vibrating up and down in the same phase.