Theoretical development of a simplified wheelset model to evaluate collision-induced derailments of rolling stock

Koo, Jeong-Seo; Choi, Se Young

doi:10.1016/j.jsv.2012.02.014

Cited by 21 publications

(8 citation statements)

References 7 publications

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“…Although the collision scenario that a tramcar colliding with rigid obstacle is defined in EN15227, 35 it only specifies the safe lifting height of wheelsets; evaluation criteria for the oblique collision derailment are not mentioned. Therefore, considering the theoretical derailment wheelset model proposed by Koo, 12 the geometric characteristics of wheel–rail contact and the derailment evaluation criteria based on the wheel displacement, four derailment types that may occur during a frontal oblique collision and the corresponding derailment criteria are defined as follows:…”

Section: Evaluation Criteria For the Oblique Collision-induced Derailmentioning

confidence: 99%

“…Koo et al. 12 proposed a theoretical derailment model of a simplified wheelset, which was verified by a dynamic simulation. Based on this model, five derailment types were classified according to the wheel–rail contact force.…”

Section: Introductionmentioning

confidence: 96%

“…In this study, a fine finite-element (FE) model of a subway head vehicle and the vehicle–rigid wall collision model are formulated to simulate the oblique frontal collision. Based on the theoretical derailment model proposed by Koo, 12 derailment evaluation criteria 9,19 and wheel/rail geometric characteristics, four derailment types that may occur during a frontal oblique collision and corresponding derailment criteria are put forward to differentiate among the vehicle derailment behaviours. The vehicle dynamic responses, including the vehicle–rigid wall impact force, wheel–rail contact force, lateral and vertical displacement, are presented.…”

Section: Introductionmentioning

confidence: 99%

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A study on the frontal oblique collision-induced derailment mechanism in subway vehicles

Yao

Zhu

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part F:

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Oblique collisions can more easily lead to train derailment and cause heavy casualties. In this paper, a fine finite-element model of a subway head vehicle–rigid wall frontal oblique collision was established and validated by a single wheelset derailment simulation. Furthermore, the derailment mechanisms and patterns under an oblique impact angle of 6.34°–40° and at an impact speed of 8–40 km/h were studied via simulation. The results indicated that three types of derailment, such as roll-over derailment, climb/roll-over derailment and wheel-lift derailment, have occurred. When the impact speed was set to 25 km/h, a climb/roll-over derailment occurred under the impact angle of greater than 40°; a roll-over derailment occurred under the impact angle of 20°–40°; and the vehicle would not derail when the impact angle was less than 15°. When the impact angle was 6.34°, the vehicle was in danger of wheel-lift derailment with the largest wheel vertical displacement of 26.83 mm and lateral displacement of 12.52 mm under the impact speed of 40 km/h, but it was safe with the largest displacement of no more than 18 mm and lateral displacement of 8.39 mm if the impact speed was less than 40 km/h. It is shown that the derailment patterns are more sensitive to the impact angle. Therefore, both the lateral and vertical displacements should be considered when studying the oblique collision-induced derailment mechanisms and patterns.

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Section: Evaluation Criteria For the Oblique Collision-induced Derailmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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A study on the frontal oblique collision-induced derailment mechanism in subway vehicles

Yao

Zhu

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…Because this research focused on collision with structures such as a containment wall after train derailment, the derailment behavior due to wheelclimbing was reproduced. The other studies 16,[36][37][38] were referenced to establish the derailment behavior and the distribution of impact force. A PC model of the Cho's study was simulated by applying the surface contact model for wheel-rail interactions and collision conditions with an oblique rigid wall in order to test the collision-induced derailment behaviors that are investigated by a theoretical wheelset derailment model.…”

Section: Occurrence Phenomenon Of Derailment After Collisionmentioning

confidence: 99%

“…9–13 In the other studies, researchers in China and Korea have performed dynamic derailment simulations of the derailment occurrence mechanism, and not the collision aspect between a derailed train and a structure. 14–18 Researchers in Sweden have analyzed the post-derailment behavior of the wheel of a derailed train collided with a concrete railroad sleeper. 19,20 Also, researchers in China have recently investigated the post-derailment dynamic behavior of railway vehicle under earthquake excitations.…”

Section: Introductionmentioning

confidence: 99%

Containment capacity and estimation of crashworthiness of derailment containment walls against high-speed trains

Bae

Yun

Lim

2016

Proceedings of the Institution of Mechanical Engineers, Part F:

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Europe, USA, China, Japan, and Korea, which possess advanced railway technologies, have attempted to develop high-speed rail technology and ensure safety based on social requirements and the need for greater speeds. However, despite these efforts, there have been recent reports of train accidents resulting in loss of lives. Fatal train accidents usually involve derailments or collisions that do not happen frequently. However, when they occur, the damage is catastrophic. Therefore, a protection infrastructure should be installed to minimize such damage. Since the high-speed railways were introduced in Korea, derailment containment walls have been constructed to mitigate and minimize the damages caused by such accidents. The need for the judgment of effectiveness and feasibility review of the derailment containment walls in terms of economics and construction ability has been presented by designers and constructors. In this paper, the authors have evaluated the containment capacity and collision durability (crashworthiness) of a derailment containment wall, constructed in Korea, using a collision simulation after the derailment of a train.

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Two-parameter bifurcation analysis of limit cycles of a simplified railway wheelset model

2018

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The effect of the nonlinear terms on bifurcation behaviors of limit cycles of a simplified railway wheelset model is investigated. At first, the stable equilibrium state loses its stability via a Hopf bifurcation. The bifurcation curve is divided into a supercritical branch and a subcritical one by a generalized Hopf point, which plays a key role in determining the occurrence of flange contact and derailment of high-speed railway vehicles, and the occurrence of this critical situation is an important decisionmaking criteria for design parameters. Secondly, bifurcations of limit cycles are discussed by comparing the bifurcation behavior of cycles for two different nonlinear parameters. Unlike local Hopf bifurcation analysis based on a single bifurcation parameter in most papers, global bifurcation analysis of limit cycles based on two bifurcation parameters is investigated, simultaneously. It is shown that changing nonlinear param-

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Theoretical development of a simplified wheelset model to evaluate collision-induced derailments of rolling stock

Cited by 21 publications

References 7 publications

A study on the frontal oblique collision-induced derailment mechanism in subway vehicles

A study on the frontal oblique collision-induced derailment mechanism in subway vehicles

Containment capacity and estimation of crashworthiness of derailment containment walls against high-speed trains

Two-parameter bifurcation analysis of limit cycles of a simplified railway wheelset model

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