Adaptive FEA of wave propagation induced by high-speed trains

Ekevid, Torbjörn; Li, Martin Xiangdong; Wiberg, Nils‐Erik

doi:10.1016/s0045-7949(01)00043-8

Cited by 21 publications

(9 citation statements)

References 17 publications

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“…Numerous studies have been conducted to simplify this problem. Some works [1,2,3] studied the wave propagation through the track-ground system in three dimensions, modeling contact forces as constant or harmonic vertical forces moving along the rails. Others [4,5,6,7,8] studied the coupled train/track system in two dimensions; they modeled rail as an Euler-Bernoulli or a Timoshenko beam connected to pads by singular points.…”

Section: Introductionmentioning

confidence: 99%

A contact-area model for rail-pads connections in 2-D simulations: sensitivity analysis of train-induced vibrations

Ferrara

Leonardi

Jourdan

2013

Vehicle System Dynamics

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A numerical model to predict train induced vibrations is presented. The dynamic computation considers mutual interactions in vehicle/track coupled systems by means of a finite and discrete elements method. The rail defects and the case of out-of-round wheels are considered. The dynamic interaction between the wheel-sets and the rail is accomplished by using the non-linear Hertzian model with hysteresis damping. A sensitivity analysis is done to evaluate the variables affecting more the maintenance costs. The rail-sleeper contact is assumed extended to an area defined contact-zone, rather than a single point assumption which fits better real case studies. Experimental validations show how prediction fits well experimental data.

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Section: Introductionmentioning

confidence: 99%

A contact-area model for rail-pads connections in 2-D simulations: sensitivity analysis of train-induced vibrations

Ferrara

Leonardi

Jourdan

2013

Vehicle System Dynamics

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“…[3][4][5] show that the numerical results obtained from the proposed finite element formulation fit well the analytical ones. It can be also verified that when the number of element increases, the numerical results converge to the exact solutions.…”

Section: Example 1: Linear Modelmentioning

confidence: 77%

“…Special techniques may be used to reduce the calculation cost. For example, in [5], an adaptive finite element procedure has been used in which the structure is re-meshed after each time step. However, these analyses are still expensive and may not be reasonable for parametric studies.…”

Section: Introductionmentioning

confidence: 99%

Finite element procedures for nonlinear structures in moving coordinates. Part 1: Infinite bar under moving axial loads

Nguyen¹,

Duhamel²

2006

Computers & Structures

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This paper deals with analyzing nonlinear structures under high-speed moving loads by use of the finite element method. The stationary response of an infinite bar posed on a Winkler foundation under constant moving loads is investigated. Instead of the transient analysis, the stationary solution of this problem is obtained by solving a static system in a reference frame which moves with the load for reducing the computation cost. To overcome the difficulty due to numerical instabilities when considering very fast loads (supersonic loads), a new procedure to govern the finite element formulation in moving coordinates is proposed. Comparing numerical solutions with analytical ones shows that the proposed method is valid for all values of load speed. Last, an example of nonlinear elastic foundation is considered to outline the nonlinear effects.

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“…For the case of elastoplasticity, remeshing has been applied in the context of the BEM-FEM coupled analysis by Elleithy et al [17,18], who updated the subdomains modelled by the FEM and the BEM according to the evolution of the plastic zones of the model. Regarding dynamic problems, although contributions can be found in the literature on elastodynamics (such as [19][20][21]) and acoustics (such as [22,23]), not many studies report on adaptive methods for coupled acoustic-elastodynamic interaction problems. Of the few there are, we would mention García et al [24], who applied an adaptive FEM algorithm to solve solid-fluid interaction problems governed by the Navier-Stokes equation and Demkowicz and Oden [25,26], who applied an hpadaptive coupled BEM-FEM model to study problems of elastic scattering, assuming the fluid to be governed by the Helmholtz equation.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Analysis of Acoustic‐Elastodynamic Interacting Models Considering Frequency Domain MFS‐FEM Coupled Formulations

Soares

Godinho

2019

Mathematical Problems in Engineering

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This work discusses adaptive iterative coupling strategies for the frequency domain analysis of interacting acoustic-elastodynamic models. The method of fundamental solutions (MFS) is used to analyze acoustic fluids, whereas the finite element method (FEM) is employed to discretize elastodynamic solids. Flexible and optimized iterative MFS-FEM coupling procedures are considered, allowing independent discretizations to be adopted for each subdomain. In this context, it is easy to implement adaptive refinements and enable enhanced analyses. Two adaptive coupling approaches are discussed, based on multiple and single iterative algorithms. Numerical results are presented to illustrate the performance of the proposed techniques.

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Adaptive FEA of wave propagation induced by high-speed trains

Cited by 21 publications

References 17 publications

A contact-area model for rail-pads connections in 2-D simulations: sensitivity analysis of train-induced vibrations

A contact-area model for rail-pads connections in 2-D simulations: sensitivity analysis of train-induced vibrations

Finite element procedures for nonlinear structures in moving coordinates. Part 1: Infinite bar under moving axial loads

Adaptive Analysis of Acoustic‐Elastodynamic Interacting Models Considering Frequency Domain MFS‐FEM Coupled Formulations

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