Comparison of Vehicle Dynamics Performance When Operating on High-speed Dedicated and Existing Railways

Abstract

In order to study the parameters difference between the high-speed dedicated and the existing railway tracks, the geometric parameters and irregularity of the two kind of tracks are compared and analyzed. The nonlinear dynamic model of Electric Multiple Units (EMU) is built, and the difference of dynamics performance of vehicle running on different railway tracks is simulated and analyzed. The results show that the track spectrum overall performance of the high-speed lines is better than that of the existing lines. At the same speed, the lateral and vertical Sperling index of vehicle running on the high-speed dedicated railway tracks is better than that of the existing railway tracks. At low speed (160km/h), when the vehicle is running on the high-speed dedicated railway tracks, the maximum and rootmean square values of the frame lateral acceleration are 59.7% and 24.6% of the existing railway tracks operating conditions respectively, and the corresponding maximum and root mean square values of vertical acceleration are 49.1% and 89.8% respectively. At high speeds (350km/h), the maximum and root mean square values of lateral and vertical acceleration of the frame are 54.2%, 32.3% and 27.6%, 55.3%. With the decrease of the track curvature, the lateral wheelset force gradually increases.