Numerical Investigation of Vibrational Acceleration Level for a Ballasted Railway Track During Train Passage in Seasonally Frozen Regions

Tian, Shuang; Li, Shanzhen; Tang, Liang; Ling, Xianzhang; Kong, Xiangcheng

doi:10.1007/978-981-15-2349-6_36

Cited by 3 publications

(2 citation statements)

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“…In any dynamic analysis, the finite element size has to be selected carefully to ensure the accuracy of results. In general, the element size of the FE model was estimated based on the smallest wavelength that allows the high-frequency motion to be simulated correctly [30]. Accordingly, the sizes of used 3D finite elements were taken as 0.05 × 0.15 × 0.1, 0.075 × 0.08 × 0.1 0.13 × 0.11 × 0.1, 0.13 × 0.24 × 0.1, and 0.4 × 0.56 × 0.1 for the ballast, top layer, bottom layer, embankment, and foundation, respectively.…”

Section: Three-dimensional Numerical Modelmentioning

confidence: 99%

“…To derive the train loads, a series of moving axle loads can be obtained according to the train geometry shown in Figure 6a. Accordingly, the successive axle loads can be expressed as a periodic function f (t) with a period of t 4 [30]: For the sake of simplicity, f(t) is supposed as a sufficiently smooth function, which can then be transformed using the Fourier function, which is composed of a series of sines and cosines.…”

Section: Train Loadsmentioning

confidence: 99%

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Evaluating the Service Performance of Heavy Axle Load Ballasted Railway by Using Numerical Simulation Method

Tian

Ling

et al. 2022

Applied Sciences

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To evaluate the service performance of the track substructure of heavy axle load (HAL) railway transportation, an inverse analysis was performed to estimate the resilient modulus values of the track substructure, based on the deflection data obtained from light falling weight deflectometer testing. Subsequently, a three-dimensional finite element model was developed to simulate the effect of the train speeds (v) and axle loads (F) on the typical dynamic responses in the railway track system. The results convincingly indicated that increasing v or F can amplify the track vibration. Finally, a critical stress ratio method was adopted to evaluate the service performance based on the numerical results. A recommended range of v and F was determined to maintain the long-term stability of the HAL railway line. The findings can provide guidance for designing the track and maintenance plans to avoid track support failures and ensure track infrastructure resiliency.

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Section: Three-dimensional Numerical Modelmentioning

confidence: 99%

Section: Train Loadsmentioning

confidence: 99%