Abstract
In order to study the influence of an integration time step on dynamic calculation of a vehicle-track-bridge under high-speed railway, a vehicle-track-bridge (VTB) coupled model is established. The influence of the integration time step on calculation accuracy and calculation stability under different speeds or different track regularity states is studied. The influence of the track irregularity on the integration time step is further analyzed by using the spectral characteristic of sensitive wavelength. According to the results, the disparity among the effect of the integration time step on the calculation accuracy of the VTB coupled model at different speeds is very small. Higher speed requires a smaller integration time step to keep the calculation results stable. The effect of the integration time step on the calculation stability of the maximum vertical acceleration of each component at different speeds is somewhat different, and the mechanism of the effect of the integration time step on the calculation stability of the vehicle-track-bridge coupled system is that corresponding displacement at the integration time step is different. The calculation deviation of the maximum vertical acceleration of the car body, wheel-sets and bridge under the track short wave irregularity state are greatly increased compared with that without track irregularity. The maximum vertical acceleration of wheel-sets, rails, track slabs and the bridge under the track short wave irregularity state all show a significant declining trend. The larger the vibration frequency is, the smaller the range of integration time step is for dynamic calculation.
Highlights
Compared with the traditional ballasted track, the ballast-less track has good safety and stability, which greatly reduces the workload of railway maintenance and prolongs the service life of the track structure [1]
The results show that the disparity among the effect of the integration time step on calculation accuracy of each component at different speeds is small, and the effect on calculation stability of each component at different speeds depends on the effect of the displacement step
The influence of the integration time step on calculation accuracy, calculation stability of finite element simulation is studied, and the influence mechanism of the integration time step on the vibration response of each component under different track irregularity states is analyzed through the spectral characteristic of sensitive wavelength
Summary
Compared with the traditional ballasted track, the ballast-less track has good safety and stability, which greatly reduces the workload of railway maintenance and prolongs the service life of the track structure [1]. The vibration of vehicle and track occurs frequently when the train is running due to track damage [2,3], rail corrugation [4], uneven settlement of subgrade [5,6] and other factors, which directly affect the service life of the track structure and driving safety and comfort. Based on the vehicle-track coupled dynamics theory, scholars at home and abroad have conducted a lot of research on the coupled vibration of high-speed railway ballast-less tracks. Peng [8] established a vehicle-track coupled dynamics numerical model and studied the effect of long-wave irregularities on the driving comfort and stability of high-speed train. Labrado [10] further established a three-dimensional vehicle-track coupled model to analyze the influence of vehicle speed on the vibration performance of the four transition typologies. Based on dynamic material property, Li [11]
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