Periodic track model for the prediction of railway induced vibration due to parametric excitation

Germonpré, Matthias; Degrande, Geert; Lombaert, Geert

doi:10.1016/j.trgeo.2018.09.015

Cited by 24 publications

(10 citation statements)

References 19 publications

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“…The results indicate that the superstructure settle along with the ballast bed, and sleepers are likely to become unsupported when the settlement amplitude is large or when the settlement wavelength is small. The paper [21] presents a track modeling approach based on a wave analysis technique for multi-coupled periodic structures. The approach efficiently models a track with varying characteristics in the longitudinal direction and predicts railway induced vibration due to parametric excitation.…”

Section: Review Of the Literaturementioning

confidence: 99%

Mechanism of the Sleeper-Ballast Dynamic Impact in Void Zones

Sysyn¹,

Przybyłowicz²,

Nabochenko³

et al. 2021

Preprint

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Unsupported sleepers or void zones in ballasted tracks are one of the most recent and frequent track failures. The void failures have the property of intensive development that, without timely maintenance measures, can cause the appearance of cost-expensive local instabilities like subgrade damages. The reason of the intensive void development lies in the mechanics of the sleeper and ballast bed interaction. The particularity of the interaction is a dynamic impact that occur due to void closure. Additionally, void zones cause inhomogeneous ballast pressure distribution between the void zone and fully supported neighbour zones. The present paper is devoted studying the mechanism of the sleeper-ballast dynamic impact in the void zone. The results of experimental in-situ measurements of rail deflections showed the significant impact accelerations in the zone even for light-weight slow vehicles. A simple 3-beam numerical model of track and rolling stock interaction has shown the similar to the experimental measurements dynamic interaction. Moreover, the model shows that the sleeper accelerations are more than 3 times higher than the corresponding wheel accelerations and the impact point appear before the wheel enters the impact point. The analysis of ballast loadings shows the specific impact behaviour in combination with the quasistatic part that is different for void and neighbour zones, which are characterised with high ballast pre-stressed conditions. The analysis of void sizes influence demonstrate that the impact loadings, wheel and sleeper maximal accelerations appear at certain void depth after which the values decrease. The ballast quasistatic loading analysis indicates more than twice increase of the ballast loading in neighbour zones for long voids and almost full quasistatic unloading for short length voids. However, the used imitation model cannot explain the nature of the dynamic impact. The mechanism of the void impact is clearly explained by the analytic solution using a simple clamped beam. A simplified analytical expression of the void impact velocity shows that it is linearly related to the wheel speed and loading. The comparison to the numerically simulated impact velocities shows a good agreement and the existence of the void depth with the maximal impact. An estimation of the long-term influences for the cases of normal sleeper loading, high ballast pre-stress and quasistatic loading in the neighbour zones and high impact inside the void are performed.

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Section: Review Of the Literaturementioning

confidence: 99%

Mechanism of the Sleeper-Ballast Dynamic Impact in Void Zones

Sysyn¹,

Przybyłowicz²,

Nabochenko³

et al. 2021

Preprint

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“…A detailed evaluation of mitigation methods dedicated to the trackbed was recently conducted in [173], with the aim of life-cycle performance analysis. Transition zones can be analysed to avoid abrupt changes in the track's vertical stiffness [174,175]. Rail suspension fasteners attenuated the dynamic interaction between the track and the vehicle in some specific frequencies [176].…”

Section: Mitigation Of Feelable Vibrationmentioning

confidence: 99%

Modelling, simulation and evaluation of ground vibration caused by rail vehicles

Thompson

Kouroussis

Ntotsios

2019

Vehicle System Dynamics

137

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There is a great need to develop rail networks over long distances and within cities as more sustainable transport options. However, noise and vibration are seen as a negative environmental consequence. Compared with airborne noise, the related problem of ground vibration is much more complex. The properties of the ground vary significantly from one location to another. There is no common assessment criterion or measurement quantity and no equivalent to the noise maps. Ground-borne vibration is transmitted into buildings and perceived either as feelable whole-body vibration or as low frequency noise; it can also affect sensitive equipment but it is generally at a level that is too low to cause structural or cosmetic damage to buildings. A review is given of evaluation criteria for both feelable vibration and ground-borne noise, empirical and numerical prediction methods, the main vehicle and track parameters that can affect the vibration levels and a range of possible mitigation methods.

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“…Then,q can be computed by inverting the linear equation (17). This computation gives the DoF of each node in the transition zone (q I ) and at its boundaries (q L and q R calculated with (15) and (14)). The DoF in the other zones can be calculated using the classical WFE method (ie.…”

Section: Decomposition In the Right Zone And In The Left Zonementioning

confidence: 99%

“…Dividing the structure into substructures and considering the equilibrium relationship in a substructure, Germonpré et al [13] studied the free wave modes in a substructure and then computed the whole structure dynamics. By separating left going and right going modes, Germonpré et al [14] applied this method to a transition zone including a train-track-soil coupling. Arlaud [15] developed a similar method excepted that it fixed the wave-number instead of fixing the frequency.…”

Section: Introductionmentioning

confidence: 99%