The impact of short-wave effects on deterioration of track geometry

Loidolt, Markus; Marschnig, Stefan

doi:10.1177/09544097231184735

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…Concluding the description of rail surface fatigue, it should be mentioned here that the interactions of damage mechanisms in the railway system are not covered in this TDM. Even though it has already been shown, e.g., by Loidolt et al [62], that spots of discontinuity on the rail surface lead to a worse track quality (up to 50% worse on average), the interaction between damage mechanisms is very challenging for TDM.…”

Section: D2mentioning

confidence: 99%

Track Deterioration Model—State of the Art and Research Potentials

Ehrhart,

Knabl,

Marschnig

2024

Infrastructures

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Track deterioration models (TDMs) help to allocate maintenance work (direct costs) to vehicle runs. Furthermore, these models demonstrate the impact of rolling stock properties on infrastructure. This paper review provides an overview of the state of the art in railway track deterioration modelling and outlines the research potential in this domain. The main focus lies on ballast degradation, rail surface wear and fatigue, and their description in an empiric analytic wear formula. The basis for discussion is the wear formula of the Graz University of Technology. While the TDM demonstrates effectiveness, enhancements are sought, particularly with regard to adjusting the track parameters that vary across railway networks. Further exploration aims to refine the description of rail surface wear and rolling contact fatigue (RCF), incorporating factors such as traction energy and short-wave effects and adapting mathematical functions such as the t-Gamma function. This review underscores the need for ongoing research to develop TDMs that are both simple and detailed enough to encourage track-friendly rolling stock design.

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Section: D2mentioning

confidence: 99%

Track Deterioration Model—State of the Art and Research Potentials

Ehrhart,

Knabl,

Marschnig

2024

Infrastructures

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“…These effects lead to dynamic load effects and thus accelerate wear of components. We have recently published details on these interrelationships in [22]. Typical places where short-wave irregularities occur are welds, isolated rail joints and rail defects.…”

Section: Evaluation Of Rail Surface Irregularitiesmentioning

confidence: 99%

“…Insulated rail joints and welding joints also contribute significantly to vehicle excitation. These dynamic forces lead to increased wear of other components and should therefore be replaced before significant damage occurs at the system level [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Quality Behaviour of Turnouts: Comparison, Problem Specification and Recommendation of Measures

Loidolt,

Marschnig,

Bürgler

et al. 2023

Applied Sciences

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For future requirements, asset management of turnouts needs to rely on data-based assessment tools. These tools must enable the quantification of quality behaviour of turnouts and identify causes of poor behaviour. In this paper, we provide a toolbox addressing these requirements. We use track geometry as the main criterion for quality behaviour in combination with additional indicators, each associated with a different component, to understand turnout performance. The toolbox is applied to five similar turnouts to compare their performance. It is revealed that one of the turnouts performs significantly worse than the others. A deeper analysis can identify worn ballast in several areas of the turnout as the cause of poor performance. Problems in the ballast bed can be attributed to worn insulated rail joints as well as to stiffness changes in the transition areas of the turnout.

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Impact of Rail Irregularities on Longitudinal Level Deterioration Based on Deconvoluted Data

Loidolt,

Weilguny,

Marschnig

2024

Infrastructures

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When a wheel passes over a rail surface irregularity, the resulting vehicle excitations lead to the application of additional system forces to both the track and the vehicle. These forces contribute to an accelerated track geometry deterioration, which in turn results in increased costs. In a recent paper, a clear correlation between the presence of rail irregularities and poor track geometry quality was demonstrated. Rail surface irregularities thereby were quantified by raw data of a chord-based optical measurement system mounted on the regular track recording vehicle in Austria. This paper deals with deconvolution of the recorded data in order to guarantee irregularity quantification without any distortion. Two different deconvolution approaches are developed and validated by additional measurements. Using the deconvoluted data, previously published evaluations were repeated, and the impact of using deconvoluted data instead of chord values was analysed. The correlation between short-wave effects and track geometry quality can not only be confirmed; it is even stronger than predicted by the chord data. The results of the analysis demonstrate that irregularities with amplitudes exceeding 0.08 mm contribute to an accelerated deterioration in track geometry. Amplitudes of a greater severity result in track geometry levels that are up to 120% inferior to the average.

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The impact of short-wave effects on deterioration of track geometry

Cited by 3 publications

References 13 publications

Track Deterioration Model—State of the Art and Research Potentials

Track Deterioration Model—State of the Art and Research Potentials

Quality Behaviour of Turnouts: Comparison, Problem Specification and Recommendation of Measures

Impact of Rail Irregularities on Longitudinal Level Deterioration Based on Deconvoluted Data

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