Numerical modeling of measured railway creep versus creep-force curves with CONTACT

Vollebregt, Edwin A. H.

doi:10.1016/j.wear.2013.11.030

Cited by 62 publications

(45 citation statements)

References 18 publications

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“…The influence of water on adhesion is usually included by adjusting the values of the static and dynamic coefficient of friction. Recent extensions of CONTACT [Vollebregt 2014] include the implementation of a falling friction law and the implementation of an elastic interfacial layer. Likewise, in the simplified theory of rolling contact, which is implemented in the algorithm FASTSIM [Kalker 1982], the influence of water can be considered by adjusting the coefficient of friction in terms of BL.…”

Section: Existing Creep Force Models Taking the Effect Of Water Into mentioning

confidence: 99%

Wheel-rail creep force model for predicting water induced low adhesion phenomena

Trummer

Buckley-Johnstone

Voltr

et al. 2017

Tribology International

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Section: Existing Creep Force Models Taking the Effect Of Water Into mentioning

confidence: 99%

Wheel-rail creep force model for predicting water induced low adhesion phenomena

Trummer

Buckley-Johnstone

Voltr

et al. 2017

Tribology International

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“…4.7(b) shows a saw-teeth shape for the tangential traction in the stick region (right side) instead of a smooth solution as a consequence of the poor resolution in time adopted. This traction distribution is similar than the results reported by Vollebregt [118] when using FASTSIM algorithm. When doubling again the time step t ∆ in Fig.…”

Section: Numerical Errors Due To Spatial/time Discretisationssupporting

confidence: 89%

“…These continuity problems become more important when adopting Kalker's Simplified Theory [97] to solve the tangential problem. Vollebregt [118] presents traction distribution plots with peaks following a saw-teeth shape in the stick zone when using FASTSIM algorithm [95]. He points out that these instabilities appear in transient rolling scenarios using CONTACT and also in steady-state situations adopting FASTSIM.…”

Section: Numerical Issuesmentioning

confidence: 99%

“…Vollebregt and Schuttelaars [116] and Giménez et al [117] also performed work on including the slip-velocity dependent friction law into FASTSIM. Vollebregt [118] implemented a falling friction law, but introduced what he calls 'friction memory' to reduce the irregularity of results. This topic is still a subject of on-going research.…”

Section: Vermeulen and Johnsonmentioning

confidence: 99%

“…The literature shows creep curves measured in real field experiments (see examples provided in Refs. [118] and [153]) in order to study the locomotive traction capability. In such cases, the longitudinal creepage typically reaches values of 50% and higher whereas the creepage is lower than 3% in most of the railway dynamic problems within the scope of the present thesis.…”

Section: Comparison To Experimental Datamentioning

confidence: 99%

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Advanced Techniques for Time-Domain Modelling of High-Frequency Train/Track Interaction

Navarro¹

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The aim of the present Thesis is to develop models for the study of very highfrequency phenomena associated with the coupled dynamics of a railway vehicle with the track. Through these models, this Thesis intends to address squeal noise as a particular case of rolling noise when the train negotiates a small radius curve.Wheel/rail interaction is the predominant source of noise emission in railway operations. Rolling contact couples the wheel and the rail through a very small area, characterised by strongly non-linear and non-steady state dynamics that differentiates rolling noise from any other noise problem. Wheel/rail contact problem is studied based on Kalker's variational theory and the local falling behaviour of the coefficient of friction is introduced by means of a regularisation of Coulomb's law. Its implementation shows that the influence of the falling friction on the creep curves can be assumed negligible, thus rolling contact is finally modelled using a constant coefficient of friction.Flexibility is introduced in railway substructures through the Finite Element (FE) method in order to cover the high-frequency range. This work adopts a rotatory wheelset model that takes computational advantage of its rotational symmetry. It also develops a cyclic flexible rail model that fixes the translational contact force in a spatial point of the mesh through a technique called Moving Element (ME) method. A modal approach is used to reduce significantly the number of degrees of freedom of the global problem and a diagonalisation technique permits to decouple the resulting modal equations of motion in order to reduce the computational requirements of the time integrator.Simulations in curving conditions in the time domain are carried out for constant friction conditions in order to study if the proposed interaction model can reproduce squeal characteristics for different curve radii and coefficients of friction.Keywords: train/track dynamic interaction, rotatory wheelset, cyclic track, wheel/rail rolling contact, falling friction, regularisation of Coulomb's law, Moving Element Method, decoupling techniques, curve squeal. iii ResumenEl objetivo de la presente Tesis es desarrollar modelos para el estudio de fenómenos de muy alta frecuencia asociados a la dinámica acoplada de un vehículo ferroviario con la vía. A través de estos modelos, esta Tesis pretende abordar el fenómeno de los chirridos como un caso particular de ruido de rodadura en condiciones de curva cerrada.La interacción rueda/carril es la fuente predominante de ruido en las operaciones ferroviarias. El contacto es el responsable del acoplamiento entre la rueda y el carril a través de un área muy pequeña caracterizada por una dinámica fuertemente no lineal y no estacionaria. El problema de contacto rueda/carril se estudia mediante la teoría variacional de Kalker y la caída local del coeficiente de fricción se introduce por medio de una regularización de la ley de Coulomb, que muestra que su influencia sobre las curvas de fluencia se puede despre...

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Locomotive Adhesion Control + Rail Friction Field Measurements = ?

Spiryagin

Harrison²,

et al. 2020

Lecture Notes in Mechanical Engineering

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Numerical modeling of measured railway creep versus creep-force curves with CONTACT

Cited by 62 publications

References 18 publications

Wheel-rail creep force model for predicting water induced low adhesion phenomena

Wheel-rail creep force model for predicting water induced low adhesion phenomena

Advanced Techniques for Time-Domain Modelling of High-Frequency Train/Track Interaction

Locomotive Adhesion Control + Rail Friction Field Measurements = ?

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