Vibration Attenuation at Rail Joints through under Sleeper Pads

Kaewunruen, Sakdirat; Aikawa, Atsushi; Remennikov, Alexander

doi:10.1016/j.proeng.2017.05.031

Cited by 44 publications

(19 citation statements)

References 10 publications

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“…Tensionless beam support was used to achieve the support condition with an allowance of hover over the support while the tensile supporting stiffness is omitted. It was validated in previous studies, effects of length and boundary of track in this investigation (18 bays or 10.8m) on the computation and frequencies of interest are negligible [10][11][12][13].…”

Section: Track Modelsupporting

confidence: 62%

“…In this investigation, the finite element models of railway tracks have been previously developed and calibrated against the numerical and experimental modal parameters [12,13]. A general-purpose finite element package STRAND7 is used for finite element simulation.…”

Section: Track Modelmentioning

confidence: 99%

“…The rail pads at rail seats were simulated using a series of spring-dashpot elements. The distance offset between rail and sleepers was set to 100mm which does not have impacts on numerical results [13]. In this study, stiffness and damping values of high-density polyethylene pads were assigned to these spring-dashpot elements both in vertical and lateral direction.…”

Section: Track Modelmentioning

confidence: 99%

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Nonlinear Dynamic of Curved Railway Tracks in Three-Dimensional Space

Liu

Ngamkhanong

Kaewunruen

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. On curved tracks, high-pitch noise pollution can often be a considerable concern of rail asset owners, commuters, and people living or working along the rail corridor. Inevitably, wheel/rail interface can cause a traveling source of sound and vibration, which spread over a long distance of rail network. The sound and vibration can be in various forms and spectra. The undesirable sound and vibration on curves is often called 'noise,' includes flanging and squealing noises. This paper focuses on the squeal noise phenomena on curved tracks located in urban environments. It highlights the effect of curve radii on lateral track dynamics. It is important to note that rail freight curve noises, especially for curve squeals, can be observed almost everywhere and every type of track structures. The most pressing noise appears at sharper curved tracks where excessive lateral wheel/rail dynamics resonate with falling friction states, generating a tonal noise problem, so-call 'squeal'. Many researchers have carried out measurements and simulations to understand the actual root causes of the squeal noise. Most researchers believe that wheel resonance over falling friction is the main cause, whilst a few others think that dynamic mode coupling of wheel and rail may also cause the squeal. Therefore, this paper is devoted to systems thinking the approach and dynamic assessment in resolving railway curve noise problems. The simulations of railway tracks with different curve radii will be carried out to develop state-of-the-art understanding into lateral track dynamics, including rail dynamics, cant dynamics, gauge dynamics and overall track responses.

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Section: Track Modelsupporting

confidence: 62%

Section: Track Modelmentioning

confidence: 99%

Section: Track Modelmentioning

confidence: 99%

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Nonlinear Dynamic of Curved Railway Tracks in Three-Dimensional Space

Liu

Ngamkhanong

Kaewunruen

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…In particular, geometry defects result from the deterioration or failure of the track support system, while the component deflects are caused by the deterioration or failure of individual track components. Without appropriate inspection and maintenance, geometry defects will cause passenger discomfort, rough ride, increased dynamic and impact loads on track components, incorrect rail adjustment on curves, incorrect track centers and fouled clearances, and eventually a train derailment by altered wheel load distribution (Kaewunruen et al, 2017(Kaewunruen et al, , 2018b. On the other hand, the component defects tend to cause more severe effects such as infrastructure damages, large settlements, highintensity impact loads, mud pumping, and so on, which can often lead to detrimental train derailments especially when the track is exposed to uncertain environments (Bin Osman and Dindar et al, 2018;Kaewunruen et al, 2018a).…”

Section: Fixed Assets and Total Inspectionmentioning

confidence: 99%

The Total Track Inspection

Kaewunruen

Osman

Rungskunroch

2019

Front. Built Environ.

Self Cite

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Operations of railway business have always placed "safety" as the first priority. Managing "public safety" requires integral risk monitoring and management. The risk monitoring for rail infrastructure management relies on accurate health monitoring and integrated track inspection. Health monitoring of all rail assets have given rise to "Big Data," which have been derived and recorded from on-board monitoring and on-track inspections of both fixed and mobile assets. In this paper, the safety-critical inspections of fixed assets or railway infrastructures have be emphasized in order to obtain the integral insights into track defects, irregularities and deterioration of track geometry and components. This paper highlights the systems-based integration framework of on-board and on-site inspection data for railway track integrity assurance under uncertain settings. The risks and consequences of extreme climates have been considered in order to improve adaptiveness, agility, and readiness of the systems-based framework of the total track inspection activities that could underpin and assure track infrastructure integrity and resilience. New challenges in observational field data have been highlighted as the evidences for the necessity for the adaptive systems-based framework of the total track inspection.

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“…The ballast could be damaged and densified by this impulsive force. In Europe, it has been reported that the USPs in high speed tracks yield an effective solution combining technical and economic efficiency [9]. Finite Element Modelling of USPs can either be done by using an elastic isotropic material or a hyper-elastic material.…”

Section: Materials Model For Uspsmentioning

confidence: 99%

USPs on Damage Reduction of Concrete Railway Sleepers

Krishnamoorthy¹,

Saleheen²

2019

IJEAT

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Ballast is the weakest among all of the railway track components due to its latent dynamic shifting and variation of stiffness along and across the track. Sharp Angular shape of the ballast components hinders evenly distribution of loads from sleeper to ballast, which in turn causes the sleepers to deteriorate over time resulting in higher frequency of railway track maintenance. Previous studies have shown that having an under-sleeper pad (USP) in between sleeper and ballast increases the contact area between them significantly. This by itself reduces the long-term damage on sleepers by a substantial amount. However, concrete sleeper is subjected to cracking due to excessive dynamic load from rail wheels. This paper intends to numerically evaluate whether the cracking of concrete sleepers gets reduced due to installing of USPs in the railway track system. The foremost reason behind cracking of concrete sleepers is the induced dynamic loads due to track irregularities and imperfect wheel rail contact. The most affected portion is at the bottom of the rail seat location of sleeper. Thus, two finite element models (one without USP and one with a 20mm thick USP attached at sleeper bottom) were analyzed while incorporating the concrete damage plasticity in the sleepers’ material. Results have shown better performance of concrete sleepers with USPs. Sleeper pads have shown a tendency to minimize excessive stress developed within naked concrete sleepers. Substantial advantage of using USPs in terms of damage reduction among sleepers were also perceived during conducting this analysis. Consequential reduction of crack formation was observed after installation of USPs

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Vibration Attenuation at Rail Joints through under Sleeper Pads

Cited by 44 publications

References 10 publications

Nonlinear Dynamic of Curved Railway Tracks in Three-Dimensional Space

Nonlinear Dynamic of Curved Railway Tracks in Three-Dimensional Space

The Total Track Inspection

USPs on Damage Reduction of Concrete Railway Sleepers

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