Derailment behavior and mechanism of a train under frontal oblique collisions

被引：0
|
作者：
Wang C. [1 ]
Zhou X. [1 ]
Liu L. [1 ]
Liu K. [1 ]
Jing L. [1 ]
机构：
[1] State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu
来源：
Journal of Railway Science and Engineering | 2023年 / 20卷 / 05期
关键词：
derailment mechanism; finite element simulation; response of car body; rigid wall; train collision;
D O I：
10.19713/j.cnki.43-1423/u.T20220897
中图分类号：
学科分类号：
摘要：
Vehicle safety as well as reliability, has attracted increasing concern from the public society due to the increasing operation speed of high-speed trains. Although a series of active safety measures have been adopted, there will be disastrous consequences and huge economic losses once a train collision and derailment accident occur. To further reveal the train collision derailment mechanism and enhance the passive safety performance, a three-car marshaling train collision finite element (FE) model was established, which took into account the car body, bogies, suspension systems, and energy-absorbing devices, and the non-linear characteristics of collision dynamics including material, geometry as well as contact were considered. The car body dynamic responses and derailment behavior caused by a train collision with a rigid wall in frontal oblique directions were simulated and analyzed. The effects of different crucial parameters of collision speeds (36, 50 and 72 km/h), collision angles (30° ～65° ), and wheel-rail friction coefficients (0.1, 0.2, 0.3, 0.4) on train collision derailment behavior were explored. The results indicated that the interfacial impact force of the head car is transmitted to the wheelset through the suspension systems, which will cause the severe oscillation of the longitudinal, lateral, and vertical wheel-rail contact forces, causing the wheelsets of the front and rear bogies to derailment in the form of climbing/ roll combination. The increase of collision speed will lead to the increase of lateral force of the wheel-rail. The increased collision angles will lead to the lateral interfacial collision force of the head car increasing first and then decreasing, while the longitudinal and vertical interfacial collision forces always increase. Besides, the larger wheel-rail friction coefficient will easily cause wheel-jumping while inhibiting collision derailment behavior during the train collision process. These results can provide theoretical support for collision passive safety design and derailment prevention of high-speed trains. © 2023, Central South University Press. All rights reserved.
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页码：1821 / 1832
页数：11
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