Wheel/rail noise generation due to nonlinear effects and parametric excitation

Nordborg, Anders

doi:10.1121/1.1459463

Cited by 65 publications

(46 citation statements)

References 5 publications

(1 reference statement)

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“…They found that non-linearities in the contact model cannot be neglected in the cases of severe roughness and/or a low static contact preload, which can cause loss of contact between wheel and rail. These results have been confirmed by Nordborg [69], who used both a frequency-domain model and a time-domain model based on Green's functions to study non-linear effects in the vertical interaction. If the response to discrete irregularities such as wheel flats and rail joints is to be calculated, time-domain models are the only option.…”

Section: Transient Contact Conditions During Squealsupporting

confidence: 63%

“…This approach is computationally efficient and allows including discrete supports. This technique, going back to Manfred Heckl's proposal for a railway simulation program [136], has been used by Nordborg [69] and recently by Mazilu [26]. As a matter of course, the wheel can also be represented by Green's functions.…”

Section: Time-domain Modelsmentioning

confidence: 99%

“…Similar to the base plate, the elastic behaviour of the ballast is non-linear due to the contact between the stones and the sleepers. Nordborg [69] found that the inclusion of discrete supports is important for lower frequencies around the sleeper-passing frequency and for higher frequencies around the pinned-pinned resonance frequency of the rail. The sleeper-pinned frequency,…”

Section: Track 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: Transient Contact Conditions During Squealsupporting

confidence: 63%

Section: Time-domain Modelsmentioning

confidence: 99%

Section: Track Modelsmentioning

confidence: 99%

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

Navarro¹

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“…1.2 Theory of the model 1.2.1 Rail Green's function in the frequency domain Green's function, , in the frequency domain for a periodically supported rail is derived in detail in [8,9,10,11]. This is needed to determine the interactive contact force of the rail/wheel and the vibration levels and the radiated noise levels of the rail.…”

Section: Rolling Noise Modelmentioning

confidence: 99%

“…It can be calculated, according to section 1.2.4, in the time-domain with the rail/wheel simulation program [11], and the nonlinear state-dependent rolling contact model [12].…”

Section: Rail/wheel Contact Force Excitationmentioning

confidence: 99%

Investigation of the Dynamic Properties of Railway Tracks using a Model for Calculation of Generation of Wheel/Rail Noise

Koh¹,

Nordborg²

2014

International Journal of Railway

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For optimization of a low-noise track system, rail vibration and noise radiation needs to be investigated. The main influencing parameters for the noise radiation and the quantitative results of every track system can be obtained using a calculation model of generation and radiation of railway noise. This kind of model includes contact modeling and the calculation model of the dynamic properties of the wheel and the rail. This study used a nonlinear wheel/rail interaction model in the time domain to investigate the excitation of the rolling noise. Wheel/rail response is determined by time integrating Green's function of the rail together with force impulses from the wheel/rail contact. This model and the results of the study can be used for supporting calculation with the conventional model by an addition of the contributions due to nonlinearities to the roughness spectrum.

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Prediction of Vertical Dynamic Vehicle–Track Interaction and Sleeper–Ballast Contact Pressure in a Railway Crossing

Nielsen

Torstensson

2020

Lecture Notes in Mechanical Engineering

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Wheel/rail noise generation due to nonlinear effects and parametric excitation

Cited by 65 publications

References 5 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

Investigation of the Dynamic Properties of Railway Tracks using a Model for Calculation of Generation of Wheel/Rail Noise

Prediction of Vertical Dynamic Vehicle–Track Interaction and Sleeper–Ballast Contact Pressure in a Railway Crossing

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