New criteria for flange climb derailment

Elkins, J A; Wu, Huimun

doi:10.1109/rrcon.2000.869983

Cited by 21 publications

(22 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This has prompted a number of researchers in recent years to establish alternative improved formulae, which take into account not only the friction coefficient and the angle of the flange, but also one or more of the above mentioned factors [10][11][12][13][14][15][16]. These equations attempt to predict more accurately the actual risk of derailment at any given moment.…”

Section: Introductionmentioning

confidence: 99%

Influence of creep forces on the risk of derailment of railway vehicles

Santamaría

Vadillo

Gómez

2009

Vehicle System Dynamics

View full text Add to dashboard Cite

Abstract:The derailment mechanism in a railway vehicle is a complex mechanical phenomenon which has been, and still is, the subject of intense research activity due to the serious consequences it can entail. Since Nadal deduced his well-known formula, many researchers have put forward alternative equations which all attempt to move closer to data obtained experimentally. This paper provides a summary of the best known, and draws up a new formulation based on the theoretical 3-D study of creep forces emerging in contact on the wheel likely to derail. It also provides an in-depth analysis of the role played by spin creepage, including its effect on obtaining theoretical derailment limits which are more realistic than those obtained using Nadal's formula. Finally, a new derailment criteria is proposed. This new criteria leads to less conservative values than Nadal's equation for zero yaw angles. When the yaw angle is high enough, the results obtained are coincident with those predicted by Nadal's equation.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of creep forces on the risk of derailment of railway vehicles

Santamaría

Vadillo

Gómez

2009

Vehicle System Dynamics

View full text Add to dashboard Cite

show abstract

“…(1) tends to be over-conservative, as it implies that the maximum creep force available at wheel-rail contact for a given normal force is entirely applied in transversal direction, producing the maximum possible wheel uplift effect [5,6]. In many cases, however, the uplift force can be lower due e.g.…”

Section: Derailment Criteriamentioning

confidence: 99%

“…in [5][6][7][8][9] have shown both experimentally and by means of mathematical modelling and simulation that the limit value for the derailment coefficient is also affected by other parameters, such as the angle of attack of the wheel over the rail and the ratio between the vertical forces on the flanging and non-flanging wheels. Furthermore, this limit value also depends upon the magnitude of the longitudinal force acting at wheel-rail contact.…”

Section: Derailment Criteriamentioning

confidence: 99%

“…the sum of the Y/Q ratios on the flanging and non-flanging wheels [10]; b. the wheelset's angle of attack [6,7,8,9,11]; c. the ratio of the longitudinal force over the vertical one, combined with the Y/Q ratio [6].…”

Section: Derailment Criteriamentioning

confidence: 99%

“…Hence, the derailment criterion best suited to describe the wheelset's proneness to derailment can be different depending on the specific design concept. It is also worth pointing out that the derailment criteria introduced in ref.s [6][7][8][9][10][11] are all based on the consideration of the flange-climb process as a quasi-static one, whereas in many cases derailment occurs as the consequence of violent shocks produced by local track defects. More research might be needed to assess the validity of the above criteria in dynamic conditions and/or to propose new criteria considering in full the dynamics of the wheelset.…”

Section: Derailment Criteriamentioning

confidence: 99%

See 2 more Smart Citations

A Study of the Factors Affecting Flange-Climb Derailment in Railway Vehicles

Diana¹,

Bruni²,

Gialleonardo³

et al.

Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance

View full text Add to dashboard Cite

Avoiding flange climb derailment is one main issue with ensuring the running safety of railway vehicles. This paper discusses the different causes that can lead to the derailment of a railway wheel, particularly in the light of different derailment criteria used by the standards or proposed by various researchers.Furthermore the paper presents two case studies, one for a vehicle with solid axles and one for a bogie with independently rotating wheels, reporting a description of the derailment case and discussing the causes that led to derailment, by making combined use of measurements and numerical simulation.Based on these exemplary cases, some conclusions are drawn concerning the validity of the derailment criteria presently used by the standards in force.

show abstract

Bibliography

2021

Mathematical Foundation of Railroad Vehicle Systems

View full text Add to dashboard Cite

Bibliography1. ACC. (2017). Competitive switching: making the switch to a more competitive, healthy freight rail system. Freight Rail Reform. https://www.freightrailreform.com/ making-the-switch-to-a-more-competitive-healthy-freight-rail-system. 2. Andersson, C. and Abrahamsson, T. (2002). Simulation of interaction between a train in general motion and a track. Vehicle System Dynamics 38: 433-455.

show abstract

New criteria for flange climb derailment

Cited by 21 publications

References 1 publication

Influence of creep forces on the risk of derailment of railway vehicles

Influence of creep forces on the risk of derailment of railway vehicles

A Study of the Factors Affecting Flange-Climb Derailment in Railway Vehicles

Bibliography

Contact Info

Product

Resources

About