Research of the Fast-speed Railway Track Reasonable Stiffness

Running safety,wheel-rail interaction forces and vehicle vibration are directly affected by railway track dynamic geometry,which is related with many elements.The changing of track stiffness affects wheel-rail dynamic forces and track dynamic geometry performance simultaneously.Vertical and lateral dynamic wheel-rail forces,vertical and lateral track displacement at different track stiffness are calculated using dynamic vehicle-track simulation software,taking the actual railway track geometry data from the track inspection car on Shanghai-Nanjing railway as excitation.Vehicle velocity and track geometry are changed as well.The relationship among track geometry,wheel-rail dynamic forces and track dynamic displacement are analyzed.The maximum value of dynamic wheel-rail forces and dynamic geometry are calculated using method of normal school.The development trend of track deformation and wheel rail forces caused by changing of track stiffness and track geometry are contrasted and analyzed,and more reasonable range of track stiffness values are put forward.