Influence of TQI key Parameters of Ballastless Track on High-speed Train Driving Status

• 1、School of Civil Engineering, Beijing Jiaotong University, Beijing 100044

Abstract：Track irregularity can increase the interaction between wheel and rail and decrease the cosy extent for passengers, and it even will endanger the safety of driving when track irregularity is serious. By means of the vehicle-track coupled dynamics theory and the multi-body dynamics software SIMPACK, a vehicle-ballastless track spatially coupled dynamic model is established. By changing the wavelength and amplitude of track irregularity,the relationship between TQI key parameters of ballastless track and high-speed driving dynamics indicators is researched. The result shows that: Vehicle dynamic responses decrease with the raising of single irregularity wavelength, and increase with the raising of irregularity amplitude; Relatively speaking, vertical profile irregularity, cross-level irregularity, alignment irregularity and torsion irregularity have great influence on vehicle dynamic response, while gauge irregularity has little effect on vehicle dynamic response.

Keywords： high-speed railway track quality index track irregularity dynamic response coupled dynamics