A Study on the Impact of the Dynamic Parameters of 25t Axle Load Heavy Haul Track Fasteners on the Vibration Response of the Wheel-Rail System
The stiffness and damping of the fastening system are critical design parameters for the dynamic performance of railway track systems.Suitable fastening stiffness and damping parameters for heavy haul track can help mitigate wheel-rail vibration impacts,reduce wheel-rail wear,and extend the service life of system components.Therefore,this paper,using China's commonly used 25t heavy haul railway as an example,establishes a coupled dynamic model of a 25t axle load freight car vehicle-track-ballasted track system to investigate the influence of fastener dynamic stiffness and damping coefficients on the wheel-rail vibration response characteristics.The main research findings are as follows:Fastener system dynamic stiffness significantly affects the vertical force between the wheel and rail and the vertical deformation of the steel rail.The maximum vertical force between the wheel and rail is positively correlated with fastener stiffness and inversely proportional to the vertical displacement of the steel rail.Fastener damping coefficients primarily impact the vibration magnitude of the vertical force between the wheel and rail.In a low-damping state,it can even lead to the wheel momentarily derailing.However,the impact on the vertical deformation of the steel rail is relatively small.By introducing the wheel load reduction rate and considering the relationships between the vertical force between the wheel and rail and the vertical displacement of the steel rail with respect to fastener stiffness and damping,it is recommended that the design range for the dynamic stiffness of 25t heavy haul fasteners should be 30 kN/mm to 90 kN/mm,and the design range for damping coefficients should be 50 kN·s/m to 100 kN·s/m.
heavy haul track fastenersfastener stiffnessdamping coefficient of fastenervehicle-rail coupling dynamicswheel-rail vertical forcerail displacement
万方数据
维普
