Dynamic studies of railtrack sleepers in a track structure system

Kumaran, G. Senthil; Menon, Devdas; Nair, K. Krishnan

doi:10.1016/s0022-460x(02)01581-x

Cited by 70 publications

(39 citation statements)

References 6 publications

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“…Excitation of free vibrations is carried out by a mechanical shock to the rail using a hammer. The use of rubber in the impact device is explained by impermissibility of the rail running surface damage (Kumaran et al, 2003).…”

Section: Methodsmentioning

confidence: 99%

Some aspects of the experimental assessment of dynamic behavior of the railway track

Solonenko

Mahmetova

Musayev

et al. 2017

jtam

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Section: Methodsmentioning

confidence: 99%

Some aspects of the experimental assessment of dynamic behavior of the railway track

Solonenko

Mahmetova

Musayev

et al. 2017

jtam

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“…Due to excessive computational time to solve the 3-D dynamic problem through numerical models, only half of the track is modeled means symmetry with respect to the center line is assumed. The length of the track considered is limited to 12 sleepers based on Kumaran et al works [9] with two moving railcar wheels as indicated in [10]. Besides, the sleeper is considered as solid element.…”

Section: Geometry Of the Modelmentioning

confidence: 99%

Modelling the influence of sub-grade material parameters on the response of railway line under moving train loads

Mekonnen¹,

Teklebrhan²

2018

J. vibroeng.

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Abstract. The sub-grade of the railway track subjected to dynamic loading is governed by its dynamic material parameters, the basic dynamic material parameters are unit weight, Young's modulus, Poisson's ratio and the material damping. However, there is a need to identify the parameters of the sub-grade that has significant effect on the dynamic response of the railway track to achieve the specified technical requirements because the behavior of the sub-grade cannot be easily estimated or verified. Hence, this paper uses three-dimensional finite elements ABAQUS coupled with Artificial Non-Reflecting Boundary to investigate the effect of varying the unit weight, Young's modulus, Poisson's ratio and the damping ratio of the sub-grade in the surface vibration induced at the embankment railway track in terms of Peak Vertical Velocity due to moving of the train loads. The input soil parameters used are soft clay, stiff clay, loose and dense uniform sand to demonstrate the parametric study. The predicated results show that both the Young's modulus and damping ratio of the sub-grade have quite significant effect on the induced surface vibrations of railway track; while the influence of both unit weight and Poisson's ratio are very small. Hence to fulfill the technical requirement of the railway track, special attention regarding to the Young's modulus and the damping ratio of the sub-grade should be paid.

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“…However, when the rail irregularities exist, the magnitude of the vertical dynamic contact force may be much greater than the static one, and using the linearized Hertzian spring does not lead to the real behaviour of the Hertz contact mechanism. Therefore, in this study the nonlinear behaviour according to equation (15) has been used for the contact.…”

Section: Wheel-rail Contact Elementsmentioning

confidence: 99%

“…Some studies [4][5][6][7][8][9][10][11][12] have proposed two-dimensional (2D) interaction models in which the vehicle is modelled as one bogie or more realistic models based on rigid bodies connected by suspension systems, and modelling the track as discrete support model. Other detailed models [13][14][15][16][17][18][19] were developed to investigate the vertical and lateral dynamic responses of the vehicle-track coupled system in which the vehicle is treated in a more realistic way, and the track is modelled as the three-dimensional (3D) discrete support model or 3D finite-element model. However, these detailed 3D models require large computer resources.…”

Section: Introductionmentioning

confidence: 99%

Comparison of dynamic effects of high-speed traffic load on ballasted track using a simplified two-dimensional and full three-dimensional model

Nguyen

Ruigómez

Galbadón

2012

Proceedings of the Institution of Mechanical Engineers, Part F:

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The vertical dynamic actions transmitted by railway vehicles to the ballasted track infrastructure are evaluated taking into account models with different degrees of detail. In particular, this matter has been studied from a two-dimensional finiteelement model to a fully coupled three-dimensional multibody finite-element model. The vehicle and track are coupled via a nonlinear Hertz contact mechanism. The method of Lagrange multipliers is used for the contact constraint enforcement between the wheel and rail. Distributed elevation irregularities are generated based on power spectral density distributions, which are taken into account for the interaction. Due to the contact nonlinearities, the numerical simulations are performed in the time domain, using a direct integration method for the transient problem. The results obtained include contact forces, forces transmitted to the infrastructure (sleeper) by railpads, and envelopes of relevant results for several track irregularities and speed ranges. The main contribution of this work is to identify and discuss coincidences and differences between discrete two-dimensional models and continuum three-dimensional models, as well to assess the validity of evaluating the dynamic loading on the track with simplified two-dimensional models.

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Dynamic studies of railtrack sleepers in a track structure system

Cited by 70 publications

References 6 publications

Some aspects of the experimental assessment of dynamic behavior of the railway track

Some aspects of the experimental assessment of dynamic behavior of the railway track

Modelling the influence of sub-grade material parameters on the response of railway line under moving train loads

Comparison of dynamic effects of high-speed traffic load on ballasted track using a simplified two-dimensional and full three-dimensional model

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