High frequency railway vehicle-track dynamics through flexible rotating wheelsets

Baeza, Luis; Fayos, Juan; Roda, A.; Insa, Ricardo

doi:10.1080/00423110701656148

Cited by 72 publications

(54 citation statements)

References 8 publications

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“…Recent studies have shown that the structural flexibility of the wheelset has a significant influence on the vehicle-track interaction (Ripke and Knothe, 1995;Chaar and Berg, 2006), and even the rotation of the wheel might also play an important role in high frequency vehicle-track dynamics under certain conditions (Baeza et al, 2008). Wen et al (2005), Pang and Dhanasekar (2006), and Pletz et al (2009) considered the detailed geometries of the wheel and rail to take their flexibility into account, but only the normal wheel-rail interaction was solved for cases at joints or in crossings.…”

Section: Introductionmentioning

confidence: 99%

Modeling of high-speed wheel-rail rolling contact on a corrugated rail and corrugation development

Zhao

Wen

Heng-yu

et al. 2014

JZUS-A

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Short pitch rail corrugations were observed on a recently opened Chinese high-speed line. On the basis of field measurements and observations of corrugations occurred on the high-speed line, a 3D transient rolling contact model is developed using the explicit finite element (FE) method to investigate high-speed vehicle-track interactions in the presence of rail corrugations. The rotational and translational movements of the wheel are introduced as initial conditions in the model. The frictional rolling contact between the wheel and the corrugated rail is solved by a penalty method based surface-to-surface contact algorithm with Coulomb's law of friction. The contact filter effect is considered automatically by the finite size of the contact patch. Through specifying a time-dependent driving torque applied to the wheel axle, the tangential vehicle-track interaction on the corrugated rail is analyzed in the time domain together with the normal one at different traction levels and at rolling speeds of up to 500 km/h. This analysis focuses on detailed contact solutions, such as distributions of the pressure, surface shear stress, Von Mises (V-M) stress, and frictional work. The corrugation dimensions, traction level, and rolling speed are varied to investigate their influences, building a solid basis for further studying the material damage mechanisms. A theory is proposed based on the simulations to explain the observed phenomenon that the corrugation gradually stabilizes. The traditional multi-body approach is found to overestimate the dynamic wheel-rail interaction on a corrugated rail.

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Section: Introductionmentioning

confidence: 99%

Modeling of high-speed wheel-rail rolling contact on a corrugated rail and corrugation development

Zhao

Wen

Heng-yu

et al. 2014

JZUS-A

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“…Análogamente, siguiendo lo que se ha razonando en el apartado 2.6.2 sobre laś orbitas, podemos definir una inertancia modal como la relación entre la derivada segunda de la coordenada generalizada correspondiente a un modo (aceleración modal) y la fuerza generalizada en otro, ambas representadas como complejos. Así, hablaremos de inertancia modal directa 11 cuando ambos modos sean el mismo, y inertancia modal cruzada cuando no.…”

Section: Inertancias Modalesunclassified

“…Estos resultados han sido aceptados por la revista internacional Vehicle System Dynamics para su publicación [11].…”

Section: Conclusionesunclassified

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Dinámica estructural de cuerpos de revolución rotatorios: aplicación al eje de un vehículo ferroviario.

Sancho¹

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“…This fact requires the computation of the external force contribution to the generalised force term in each integration step during the simulation. The work presented by Fayos et al [55], extended and applied by Baeza et al [56] and Torstensson et al [57], proposes a method that solves the above mentioned problems.…”

Section: Wheelset Modelsmentioning

confidence: 99%

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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High frequency railway vehicle-track dynamics through flexible rotating wheelsets

Cited by 72 publications

References 8 publications

Modeling of high-speed wheel-rail rolling contact on a corrugated rail and corrugation development

Modeling of high-speed wheel-rail rolling contact on a corrugated rail and corrugation development

Dinámica estructural de cuerpos de revolución rotatorios: aplicación al eje de un vehículo ferroviario.

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

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