Study of an active hydraulic anti-roll device for high-speed railway vehicles

In recent years, active secondary suspension concepts have been proposed in high-speed railway vehicles as a means to increase service speed maintaining the same level of ride comfort for passengers. Aim of this paper is to present the development of a concept for an active hydraulic anti-roll device to be introduced in the secondary suspension of a railway vehicle, replacing the traditional mechanical anti-roll bar, incorporating the capability to provide carbody tilt up to 2 Deg. target, reducing passengers’ exposure to lateral acceleration in curves and allowing to raise service speed on existing high speed lines. The performances of the proposed active suspension are assessed by means of numerical simulation, showing the possibility to raise the speed of the vehicle on an existing high-speed line from 300 to 340 km/h keeping a comparable level of comfort.