Abstract
This study aims to develop a framework based on the Nadal formula to assess train derailment risk. Monte Carlo simulation was adopted to develop 10000 sets of random parameters to assess train derailment risk subject to the curvature radius of the track, the difference between the flange angle and the equivalent conicity, and accelerations from 250 to 989.22 gal during horizontal earthquake. The results indicated that railway in Taiwan, China has no derailment risk under normal conditions. However, when earthquakes occur, the derailment risk increases with the unloading factor which is caused by seismic force. The results also show that equivalent conicity increases derailment risk; as a result, equivalent conicity should be listed as one of maintenance priorities. In addition, among all train derailment factors, flange angle, equivalent conicity and unload factors are the most significant ones.
摘要
本研究旨在建立一个基于纳达尔公式的列车脱轨风险评估框架。采用蒙特卡罗仿真方法, 建立 了10000 组随机参数, 模拟最大地表加速度为250~989.22 gal 的水平地震情况, 评估列车脱轨风险受 轨道曲率半径、翼缘角与等效圆锥度的差值的影响。结果表明, 铁路系统在正常情况下无脱轨风险。 然而, 当地震发生时, 脱轨风险随着地震力引起的卸载因子的增大而增大。结果还表明, 等效锥度增 加了脱轨风险;因此, 应将等效锥度列为维护重点之一。此外, 在所有列车脱轨因素中, 翼缘角、等效 圆锥度和卸载因素是最重要的。
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Chung, Mh., Chang, Ch., Chang, Ky. et al. A framework for train derailment risk analysis. J. Cent. South Univ. 26, 1874–1885 (2019). https://doi.org/10.1007/s11771-019-4141-4
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DOI: https://doi.org/10.1007/s11771-019-4141-4