Abstract
The widespread faults that occur in railway wheels and can cause a massive dynamic impact are the wheel tread flat. The current work considered changes in vehicle speed or wheel radius deviation and studied the dynamic impact load. The modal technique for the impact evaluation induced by the wheel flat was proposed via the finite element analysis (FEA) software package ANSYS, integrated into a multibody dynamics model of the high-speed train CRH2A (EMU) through SIMPACK. The irregularity track line has developed and depends on the selected simulation data points. Additionally, a statistical approach is designed to analyze the dynamic impact load response and effect and consider different wheel flat lengths and vehicle speeds. The train speed influence on the flat size of the vertical wheel-rail impact response and the statistical approach are discussed based on flexible, rigid wheelsets. The results show that the rigid wheel flat has the highest vertical wheel impact load and is more significant than the flexible wheel flat force. The consequences suggest that the wheelset flexibility can significantly improve vertical acceleration comparably to the rigid wheel flats. In addition, the rendering of the statistical approach shows that the hazard rate, PDF, and CDF influence increase when the flat wheel length increases.
Highlights
Wheel/rail interaction is one of the best multiple research subjects in railway engineering [1]
The impact load and the acceleration are specified from the 0–400 km/h sample of speed increment, and the wheel flat length L 50 mm. is shows that the wheel/rail impact occurs relatively fast and has high-frequency vibration
Conclusion e SIMPACK platform and ANSYS have been established. e multibody system model of coupled high-speed vehicles/track integrated with finite element method (FEM) is used to study flexible and rigid wheelsets and introduce dynamic effects when various wheel flat lengths and different speeds appear
Summary
Wheel/rail interaction is one of the best multiple research subjects in railway engineering [1]. Nielsen et al [34] proposed a modal method to develop a nonrotating flexible wheelset model integrated into the vehicle-track dynamic model to investigate the influences of rail corrugation and wheel out-of-roundness on the vertical contact forces. Baeza et al [36] developed a rotating flexible wheelset model using the Euler’s method to study the high-frequency vehicle response caused by wheel flat and track corrugations. E modal synthesis technique is implemented to evaluate the dynamic response of rotating flexible wheelsets affected by the wheel flat induction impact load, integrating the multibody dynamics model of high-speed trains into SIMPACK software. A series of simulations are performed, and the statistical method can cover various wheel flat lengths, vehicle speeds, and track irregularities It can predict the vertical wheel/rail impact results, lateral wheel/rail forces, and wheelset vertical acceleration.
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