An Eulerian coordinate-based method for analysing the structural vibrations of a solid of revolution rotating about its main axis

Fayos, Juan; Baeza, Luis; Denia, F.D.; Tarancón, J. E.

doi:10.1016/j.jsv.2007.05.051

Cited by 38 publications

(36 citation statements)

References 9 publications

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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%

“…This section details the equation of motion that takes into account the gyroscopic and inertial effects associated with the rotation of the wheelset and derived through an Eulerian-modal approach introduced by Fayos et al [55]. This approach also reduces the dimension of the dynamic system and thus the computational cost.…”

Section: Flexible and Rotating Wheelset Modelmentioning

confidence: 99%

“…The introduction of a rotating flexible wheelset in Ref. [55,160] (see Section 5.3), which fully accounts for inertia forces such as gyroscopic forces and centrifugal stiffening, allows an important step in finding these wheel resonance peaks. Table 6.3.…”

Section: Wheel and Track Modelsmentioning

confidence: 99%

“…The wheelset has been modelled as a flexible and rotating wheelset [55,160], in which Eulerian-modal coordinates are employed. 400 vibration modes of the wheelset have been considered, covering a frequency range up to 8.5 kHz in order to address the high-frequency range in which curve squeal occurs.…”

Section: Wheelset Track and Contact Modelsmentioning

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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Section: Wheelset Modelsmentioning

confidence: 99%

Section: Flexible and Rotating Wheelset Modelmentioning

confidence: 99%

Section: Wheel and Track Modelsmentioning

confidence: 99%

Section: Wheelset Track and Contact Modelsmentioning

confidence: 99%

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

Navarro¹

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“…La metodología desarrollada en este capítulo, para la obtención de la ecuación del movimiento en coordenadas modales mixtas lagrangianas-eulerianas, constituye la principal aportación de esta Tesis y ha sido publicada en Journal of Sound and Vibration [32].…”

Section: Conclusionesunclassified

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

Sancho¹

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Investigation of Railway Curve Squeal Using a Combination of Frequency- and Time-Domain Models

Pieringer

Torstensson

Giner

et al. 2018

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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An Eulerian coordinate-based method for analysing the structural vibrations of a solid of revolution rotating about its main axis

Cited by 38 publications

References 9 publications

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

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

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

Investigation of Railway Curve Squeal Using a Combination of Frequency- and Time-Domain Models

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