Differential wear and plastic deformation as causes of squat at track local stiffness change combined with other track short defects

Li, Zili; Zhao, Xin; Dollevoet, Rolf; Molodova, Maria

doi:10.1080/00423110801935855

Cited by 66 publications

(51 citation statements)

References 2 publications

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“…These cracks, together with a high impact, load could lead to a catastrophic rail break. To guarantee safety, rail-top grinding is employed as a maintenance measure to address light and moderate squats, whereas for severe squats, the costly replacement of the rail is usually inevitable [38]. Consequently, the maintenance costs are high and disturbances in network operation are common.…”

Section: Assessment Of a Healthy Structure For Railway Tracksmentioning

confidence: 99%

Identification of characteristic frequencies of damaged railway tracks using field hammer test measurements

Oregui

Dollevoet

2015

Mechanical Systems and Signal Processing

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Section: Assessment Of a Healthy Structure For Railway Tracksmentioning

confidence: 99%

Identification of characteristic frequencies of damaged railway tracks using field hammer test measurements

Oregui

Dollevoet

2015

Mechanical Systems and Signal Processing

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“…The sensitivity of ABA to rail profile deviation was investigated in [16]. It has been shown that even trivial rail surface indentations of 10 mm long and 0.05-0.2 mm deep can be effectively detected by the ABA technology.…”

Section: Aba Measurement Systemmentioning

confidence: 99%

Health condition monitoring of insulated joints based on axle box acceleration measurements

Molodova

Oregui

Núñez

et al. 2016

Engineering Structures

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a b s t r a c tThis paper presents a health condition monitoring system for insulated rail joints (IRJs) based on axle box acceleration (ABA) measurements. The ABA signals from all the wheels of the measuring train are processed to extract those characteristics that better represent the quality of the IRJ. Then, different indicators are used for damage assessment, the most relevant being a set of frequency bands in the ABA power spectrum. A detection algorithm is proposed based on the derived frequency characteristics of the ABA signal. We compared the responses of IRJs in good condition with those in poor condition. Track inspections were performed to validate the health condition monitoring methodology in different IRJs of the Dutch railway network. The hit rate of IRJs detection was 84% for two validated tracks. The damage assessment procedure allowed to prioritize the IRJs that require maintenance. This information is useful for the railway inframanagers as it allows to predict where safety compromises will be faced.

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“…The wheel geometry corresponds to a passenger car wheel of the Dutch railway network with a radius of 0.46 meter; The rail is modeled as UIC60 with an inclination of 1:40. The squat position is 0.45m away from the initial wheel position, and just over the edge of the sleeper where the support stiffness varies, which has been considered as an important contributing factor for squats development [7]. The wheel and the rail were modeled with 8-node elements.…”

Section: 1mentioning

confidence: 99%

“…On the Dutch railway network, hundreds of kilometers of track are infected with squats [7]. When a train runs over a severe squat, wheel-rail impact inevitably happens and simultaneously impact noise is generated and emitted.…”

Section: Introductionmentioning

confidence: 99%

An Explicit Integration Finite Element Method for Impact Noise Generation at a Squat

Yang

Dollevoet

2015

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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SummaryThis paper presents a full finite element (FE) interaction model of wheel-track to study the wheel-rail impact noise caused by squat. The wheel, the rail and some other track components are modeled with finite elements in three dimensions, where necessary and appropriate. Realistic contact geometry, including geometric irregularity (squat) in the contact surfaces is considered. The integration is performed in the time domain with an explicit central difference scheme. For convergence, the Courant time step condition is enforced, which, together with the detailed modeling of the structural and continuum of the wheel-track system, effectively guarantees that vibration frequency of 10 kHz or higher is reproduced. By making use of the calculated velocities and pressures on the vibrating surfaces, the boundary element method (BEM) based on Helmholtz equation is adopted to transform the vibration of the track into acoustic signal.

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Differential wear and plastic deformation as causes of squat at track local stiffness change combined with other track short defects

Cited by 66 publications

References 2 publications

Identification of characteristic frequencies of damaged railway tracks using field hammer test measurements

Identification of characteristic frequencies of damaged railway tracks using field hammer test measurements

Health condition monitoring of insulated joints based on axle box acceleration measurements

An Explicit Integration Finite Element Method for Impact Noise Generation at a Squat

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