Acceleration of Vibration Source Induced by Subway Track

Abstract:

The track vibration is treated as the source of the environmental vibration induced by underground train,and the vibration accelerations of track are theoretically calculated.Based on the theory of Winkler foundation beam,an analytical model of wheel-track-trackbed is established,and the track vibration accelerations caused by train weight are obtained.Wheel-rail dynamic contact forces are calculated according to Hertz contact theory.Green's function is utilized to model the track deformation caused by wheel-rail dynamic contact forces and rail irregularity,and the track vibration accelerations induced by the contact forces are calculated.By adding the two kinds of acceleration,the train-induced track vibration accelerations causing environmental vibration are obtained.For verification,comparison of measured and analytical accelerations is made.The analytical results show reasonable conformity with the measurements.