Simulation Analysis on the Dynamics Performance of the Semi-Active Suspension System in High-speed EMUs

A semi-active damper principle based on sky-hook theory was described.Taking CRH380A EMUs head car as studying object,influence of sky-hook damping coefficient and time delay of the system on the vehicle dynamics performance was analyzed.The results showed that: the greater the sky-hook damping coefficient was,the better lateral vibration performance of vehicle was,and the biggest system allowable time delay turned smaller.So,lateral vibration performance and system time-delay influence should be considered at the meantime for design of sky-hook damping coefficient.Compared with the passive suspension,the semi-active suspension improved lateral vibration isolated performance of car body obviously,the average improvement rate of which was more than 20%.