Modelling and experiment of railway ballast vibrations

Zhai, Wanming; Wang, K.Y.; Lin, Jianhui

doi:10.1016/s0022-460x(03)00186-x

Cited by 278 publications

(210 citation statements)

References 6 publications

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“…While mass is an easy property to determine, stiffness and damping are more challenging. Damping of materials is very difficult to discern unless by experimentation [18] and while the stiffness of a component might be simpler in comparison, stiffness changes with the dimension of the component. This is challenging for the ballast where a small volume is required to be isolated to study the effects of vibration.…”

Section: One-dimensional Analytical Model and Harmonic Excitationmentioning

confidence: 99%

Suppression of Ground Borne Vibration Induced by High-Speed Lines

et al. 2018

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Abstract. Vibration of high-speed lines leads to annoyance of public and lowering real estate values near the railway lines. This hinders the development of railway infrastructures in urbanised areas. This paper investigates the vibration response of an isolated rail embankment system and modifies the component to better attenuate ground vibration. Mainly velocity response is used to compare the responses and the applied force is of 20 kN at excitation frequencies of 5.6 Hz and 8.3 Hz. Focus was made on ground-borne vibration and between the frequency range of 0 and 250 Hz. 3D Numerical model was made using SolidWork software and frequency response was produced using Harmonic Analysis module from ANSYS Workbench software. For analytical modelling MATLAB was used along with Simulink to verify the mathematical model. This paper also compares the vibration velocity decibels (VdB) of analytical twodegree of freedom model mathematical model with literature data. Harmonic excitation is used on the track to simulate the moving load of train. The results showed that modified analytical model gives the velocity response of 75 VdB at the maximum peak. Changes brought to the mass and spacing of the sleeper and to the thickness and the corresponding stiffness for the ballast does not result in significant vibration response. Limitations of two-degree analytical model is suspected to be the cause of this inactivity. But resonance vibration can be reduced with the aid of damping coefficient of rail pad. Statistical analysis methods t-test and ANOVA single factor test was used verify the values with 95% confidence.

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Section: One-dimensional Analytical Model and Harmonic Excitationmentioning

confidence: 99%

Suppression of Ground Borne Vibration Induced by High-Speed Lines

et al. 2018

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“…Some of these models consider the mass of the ballast as a point mass located below each sleeper and its value is taken relative to the amount of stiffness and damping. Furthermore, shear springs and dampers may interconnect these masses [8].…”

Section: Dynamic Models Of Railway Ballasted Trackmentioning

confidence: 99%

“…This revealed to be particularly important when decisions are to be taken, related to the strengthening of existing structures in order to increase traffic speeds and when comfort of passengers is an important issue. In order to evaluate the vertical vibrations of the bridges when the dynamic behavior of the track is taken into account, the authors [7,8,9,10,11] have already proposed different models including vertical springs, dampers and masses, which are interposed between the loads and the structure in order to simulate the railway track behavior. The main purpose of this paper is to compare the dynamic behavior of ballasted simple supported viaducts with and without the referred track models, taking into account the structural dynamic response obtained from the field measurements, in order to evaluate the influence of the track in the safety check.…”

Section: Introductionmentioning

confidence: 99%

Vibration Assessment of Railway Viaducts Under Real Traffic Using Bridge-Track Models

Rigueiro

Rebelo

Silva

2006

Computational Methods in Engineering &Amp; Science

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The main purpose of this work is to evaluate and compare the dynamic response of a ballasted single-span simply supported viaduct using available models for the track system composed by the rails, the sleepers and the ballast. The dynamic response obtained from field measurements is used to establish the dynamic characteristics of the structure and the real traffic response acceleration to be used as reference for the comparisons. For the numeric calculations two types of loading model are considered, namely the moving forces model and the interaction bridge/track/vehicle model.

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“…Kerr [4,5] investigated the measuring methods of railway track stiffness. One of the methods for calculating the support stiffness in the railway tracks is the pyramid model developed by Zhai et al [6]. Puzavac et al [7] studied the effect of track stiffness due to moving load.…”

Section: Introductionmentioning

confidence: 99%

“…Reviewing the existing literature indicates that the less researches have been done on the effects of the support stiffness on the vehicle/track interaction specifically by considering the important parameters such as the ballast depth, sleeper width and the distance of sleepers. In the present study, at the first stage, the existing pyramid model that was developed by Zhai et al [6] is extended to three different stress conditions including WOA for the cases without stress overlap area in adjacent sleepers, OAP for considering the stress overlap area between adjacent sleepers with pyramid stress distribution and OAC for the cases of stress overlap area between adjacent sleepers with cubical stress distribution. In the next stage, a vehicle/track problem is simulated using finite element method.…”

Section: Introductionmentioning

confidence: 99%