Bridge transition monitoring: Interpretation of track defects using digital image correlation and distributed fiber optic strain sensing

Pannese, Eric; Take, W. Andy; Hoult, Neil A.; Yan, Ruobing; Le, Hoat

doi:10.1177/0954409719851626

Cited by 14 publications

(6 citation statements)

References 24 publications

(54 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The GPS location measurements and car body vertical accelerations were considered in a multiresolution analysis and state machine design methodology for identification of the void zones. A diagnostic of the unsupported sleepers in transition zones using the photogrammetric method is presented in [32][33][34]. The authors of [32] present the results of a field monitoring study of a railway bridge transition with void defects using the measurement of both track displacements using digital image correlation and distributed rail strains using a Rayleigh-based fibre optic analyser.…”

Section: Review Of the Literaturementioning

confidence: 99%

Mechanism of Sleeper–Ballast Dynamic Impact and Residual Settlements Accumulation in Zones with Unsupported Sleepers

et al. 2021

View full text Add to dashboard Cite

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 such as subgrade damages. The reason for 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 occurs 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 to 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 lightweight slow vehicles. A simple three-beam numerical model of track and rolling stock interaction has shown dynamic interaction similar to the experimental measurements. Moreover, the model shows that the sleeper accelerations are more than 3 times higher than the corresponding wheel accelerations and the impact point appears 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 by high ballast pre-stressed conditions. The analysis of void size influence demonstrates that the maximal impact loadings and maximal wheel and sleeper accelerations appear at a certain void depth, after which the values decrease. The ballast quasistatic loading analysis indicates an increase of more than 2 times in 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 is performed.

show abstract

Section: Review Of the Literaturementioning

confidence: 99%

Mechanism of Sleeper–Ballast Dynamic Impact and Residual Settlements Accumulation in Zones with Unsupported Sleepers

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The GPS location measurements and carbody vertical accelerations were considered in a multi-resolution analysis and state machine design methodology for identification of the void zones. A diagnostic of the unsupported sleepers in transition zones using the photogrammetric method is presented in [32,33,34]. The study [32] demonstrates the results of a field monitoring study of a railway bridge transition with void defects using the measurement both track displacements using Digital Image Correlation and distributed rail strains using a Rayleigh-based fibre optic analyser.…”

Section: Review Of the Literaturementioning

confidence: 87%

“…A diagnostic of the unsupported sleepers in transition zones using the photogrammetric method is presented in [32,33,34]. The study [32] demonstrates the results of a field monitoring study of a railway bridge transition with void defects using the measurement both track displacements using Digital Image Correlation and distributed rail strains using a Rayleigh-based fibre optic analyser. The measurements of rail-sleeper gaps are be used to obtain a first-order estimate of the shape of the differential track settlement profile.…”

Section: Review Of the Literaturementioning

confidence: 87%

Mechanism of the Sleeper-Ballast Dynamic Impact in Void Zones

Sysyn¹,

Przybyłowicz²,

Nabochenko³

et al. 2021

Preprint

View full text Add to dashboard Cite

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.

show abstract

“…The application of the photogrammetric method for the diagnostic of transition zones is presented in [ 68 , 69 ]. The research [ 68 ] demonstrates the results of a field monitoring study of a railway bridge transition with void defects using the measurement both track displacements using digital image correlation and distributed rail strains using a Rayleigh-based fiber-optic analyzer. It was concluded that measurements of rail–sleeper gaps could be used to obtain a first-order estimate of the shape of the differential track settlement profile.…”

Section: In Situ Measurements Of Rail Deflection In Void Zonementioning

confidence: 99%

Identification of Sleeper Support Conditions Using Mechanical Model Supported Data-Driven Approach

Sysyn

Przybyłowicz

Nabochenko

et al. 2021

Sensors

View full text Add to dashboard Cite

The ballasted track superstructure is characterized by a relative quick deterioration of track geometry due to ballast settlements and the accumulation of sleeper voids. The track zones with the sleeper voids differ from the geometrical irregularities with increased dynamic loading, high vibration, and unfavorable ballast-bed and sleeper contact conditions. This causes the accelerated growth of the inhomogeneous settlements, resulting in maintenance-expensive local instabilities that influence transportation reliability and availability. The recent identification and evaluation of the sleeper support conditions using track-side and on-board monitoring methods can help planning prevention activities to avoid or delay the development of local instabilities such as ballast breakdown, white spots, subgrade defects, etc. The paper presents theoretical and experimental studies that are directed at the development of the methods for sleeper support identification. The distinctive features of the dynamic behavior in the void zone compared to the equivalent geometrical irregularity are identified by numeric simulation using a three-beam dynamic model, taking into account superstructure and rolling stock dynamic interaction. The spectral features in time domain in scalograms and scattergrams are analyzed. Additionally, the theoretical research enabled to determine the similarities and differences of the dynamic interaction from the viewpoint of track-side and on-board measurements. The method of experimental investigation is presented by multipoint track-side measurements of rail-dynamic displacements using high-speed video records and digital imaging correlation (DIC) methods. The method is used to collect the statistical information from different-extent voided zones and the corresponding reference zones without voids. The applied machine learning methods enable the exact recent void identification using the wavelet scattering feature extraction from track-side measurements. A case study of the method application for an on-board measurement shows the moderate results of the recent void identification as well as the potential ways of its improvement.

show abstract

Bridge transition monitoring: Interpretation of track defects using digital image correlation and distributed fiber optic strain sensing

Cited by 14 publications

References 24 publications

Mechanism of Sleeper–Ballast Dynamic Impact and Residual Settlements Accumulation in Zones with Unsupported Sleepers

Mechanism of Sleeper–Ballast Dynamic Impact and Residual Settlements Accumulation in Zones with Unsupported Sleepers

Mechanism of the Sleeper-Ballast Dynamic Impact in Void Zones

Identification of Sleeper Support Conditions Using Mechanical Model Supported Data-Driven Approach

Contact Info

Product

Resources

About