Simulation of Interaction Between a Train in General Motion and a Track

Andersson, Clas; Abrahamsson, Thomas

doi:10.1076/vesd.38.6.433.8345

Cited by 48 publications

(29 citation statements)

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“…Uno de los trabajos que ha contribuido a través de un eje flexible corresponde a la Tesis de Andersson [2] y a los artículos que de ella se han publicado [3,42]. En su modelo desprecia los efectos asociados a la rotación.…”

Section: Motivación Y Antecedentesunclassified

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

Sancho¹

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Section: Motivación Y Antecedentesunclassified

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

Sancho¹

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“…Modern general-purpose softwares for the simulation of railway vehicle systems have included features that enable efficient dynamic analysis of the railway vehicles and vehicle-track interaction [4,20,30]. The dynamic behavior of railway vehicles relates to the motion or vibration of all the parts of the vehicle and is influenced by the vehicle design, particularly the suspension and the track on which the vehicle run.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The fundamental component common to all conventional railway vehicles is the wheelset [20]. The movement of the wheelset over the track is characterized by a complex interaction [4,26] where lateral translation as well as yaw and roll rotations are observed. The formulation of the problem of contact between the wheel and the rail is complex task and has been the subject of several investigations which presented different solutions [21,24,27].…”

Section: Literature Reviewmentioning

confidence: 99%

Multibody Approach for Railway Dynamic Analysis

Shaltout¹

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In the work presented, a computational tool used for the dynamic simulation of railway vehicle systems was developed using multibody systems formulations. The model based on the multibody techniques developed by Shabana. With respect to other exciting methodologies the proposed one make use of a combined frame of references that permit the use of independent coordinates, with out the possibility to have singularity configurations depending on the rotation sequence. The combined frame of references used as a base for the formulation and modeling of wheel-rail contact problem with high precision. The program was designed for considering with a flexible form the different configuration of railway vehicles. The main structure of the program has the ability of making changes for enhancement of the wheel-rail contact model or the implementation of dynamic structure of the track, which considered to be future aspects for a PHD dissertation. The model used was applied to make a simulation for single bogie , also for a complete vehicle with two bogies. The obtained results of the dynamic response for a defined track composed of, tangent segment, transition curve which take the form of a clothoid curve, and finally circular curve with constant radius. The calculations were made for different velocities, lower than the critical in which the vehicle responded in stable form, and higher than the critical at which the instability of the vehicle was studied.i ResumenEn este trabajo se ha llevado a cabo el desarrollo de una herramienta computacional para la simulación dinámica de vehículos ferroviarios. El modelo está basado en técnicas multicuerpo debidas a Shabana. Con respecto a otras metodologías existentes, la propuesta hace uso de un conjunto de sistemas de referencia que permite el uso de coordenadas independientes sin la posibilidad de configuraciones singulares debida a grandes giros. El conjunto de sistemas de referencia sirve de base para formular de manera precisa el problema de contacto rueda-carril. El programa está diseñado para considerar de forma flexible distintas configuraciones de vehículo así como diversas geometrías de trazado. La estructura del programa está abierta a cambios orientados a la mejora del modelo de contacto rueda-carril o a la implementación de la dinámica estructural de la vía, aspectos del modelado que serán hitos en el desarrollo de una futura tesis doctoral. Se han llevado a cabo simulaciones de un bogie y de un vehículo completo con bogies. Los resultados corresponden a la respuesta dinámica asociada al trazado de una vía definida por un tramo recto, clotoide de transición y plena curva. Los cálculos fueron realizados para velocidades subcríticas en las que el vehículo responde de forma estable, y supercríticas en la que se aprecia el fenómeno de inestabilidad dinámica.iii Resum En este treball s'ha dut a terme el desenvolupament d'una ferramenta computacional per a la simulació dinàmica de vehicles ferroviaris. El model està basat en tècniques multicossos desenvolupades per Sha...

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“…Anderson and Abrahamsson [133] extended the DIFF model [62] to consider the vertical, longitudinal and lateral dynamics in order to analyse the wear; the new version was called DIFF3. The vehicle model was reduced to a bogie model, with a rigid frame and the wheelset consisted of two rigid wheels and a rigid or elastic axle.…”

Section: Time-domain Modelsmentioning

confidence: 99%

“…This approach has been chosen by Maria Heckl and Abrahams [137] who formulated a squeal model for the wheel represented as an annular disc. Pieringer [133] has recently developed a model which represents the wheels and rails through a set of impulsional response functions to study the squeal noise, modelling the wheel/rail contact as instationary and non-Hertzian from the Kalker's variational theory.…”

Section: Time-domain 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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Simulation of Interaction Between a Train in General Motion and a Track

Cited by 48 publications

References 0 publications

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

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

Multibody Approach for Railway Dynamic Analysis

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

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