160 km/h 梯形轨枕有砟轨道动力性能研究OA

In order to ensure the smooth implementation of tests on the running safety and reliability of the ballasted track with trapezoidal sleepers at a speed of 160 km/h on the Circular Test Track,a vehicle-track coupled dynamic model was established using finite element analysis software.The vibration indicators of the ballasted track with trapezoidal sleepers,as well as the vehicle body ride comfort and running stability indices under different vehicle speeds were analyzed.The results show that:①the lateral resistance of trapezoidal sleeper ballast bed reaches 18.3 kN/m,which is 55.2％higher than the specification requirement;and the longitudinal resistance is 125 kN,meeting the design requirements;②compared with the traditional TypeⅢc sleeper track bed,the ballast stress under trapezoidal sleepers is reduced by more than 50％,decreasing from 0.12～0.14 MPa to 0.04～0.05 MPa;③at a speed of 160 km/h,the maximum vertical rail displacement is 0.42 mm,and the vertical acceleration of sleepers is 87.13 m/s2,both of which are lower than the specification limits;④both vehicle body ride comfort and running stability indices meet the specification requirements with a considerable safety margin.All dynamic evaluation indices meet the specification requirements,verifying the safety and rationality of the track structure design.