Prediction on vibration source system of a city subway considering parameter influence

In order to study vibration source system of a unfinished city subway,vehicle-track vertical coupled model of vibration was established base on the parameters proposed about vehicle types,block pads and rail fastenings. Maximum vertical vibration accelerations of vehicle,wheel sets and track bed were calculated,stability of vehicle and damping effect of vibration source were analyzed. Analysis results showed that vibration source has a better damping effect on Fuzhou subway; stability of A-type vehicle was better than that of B-type vehicle; the parameters selection of vibration source system did not significantly affect the damping effect in low speed,with the increase of speed of the vehicle,damping effect gradually decrease and the gap expand considering different parameters,but it tend to be stable when the speed was more than 60 km / h; the rail fastening was the biggest contributor to damping effect,damping of block pad has some contribution,and the contribution of vehicle type and block pad stiffness was not distinct.