Reduction of external rail wearing on road curves

Povilaitiene, Inesa; Laurinavičius, Alfredas

doi:10.1080/13923730.2004.9636296

Cited by 6 publications

(7 citation statements)

References 3 publications

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“…Povilaitiene and Podagelis 6 described the factors that influenced rail side wear, divided the factors into three groups (uncontrolled factors, partially controlled factors, and controlled factors), and used the regression analysis to analyze the effects of those factors on rail side wear. They proposed a rail cant calculation methodology (see Povilaitiene and Laurinavicius 7 ) and a mathematical model (see Povilaitiene et al. 8 ) to evaluate the influence of the rail cant and gauge width on the rail wear around curves; in their experiments, they observed that an increase in the cant and a widening of the gauge around a curve with a radius of less than 650 m decreased the intensity of the external rail head side wear.…”

Section: Introductionmentioning

confidence: 99%

A stochastic model for the estimation of renewal periods of sharply curved metro rails

Bai

Liu

Sun

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part F:

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Rail wear is the most common defect that affects sharply curved metro rails, thus impacting their renewal periods. This article presents a stochastic model, based on a Weibull distribution, for the estimation of the renewal periods of sharply curved metro rails based on the analysis of the characteristics of rail wear. The model considers several heterogeneous factors to determine their effects on the deterioration process and is shown to be able to estimate the life expectancy of these rails in any wear state, as well as their remaining lives and renewal periods, with respect to these heterogeneous factors. The model is validated by a case study of the Beijing Metro, based on 10 years of rail wear inspection data and heterogeneous factor data of 200 sharp curves.

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Section: Introductionmentioning

confidence: 99%

A stochastic model for the estimation of renewal periods of sharply curved metro rails

Bai

Liu

Sun

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…Thus, superelevation calculation method, which takes into consideration not only the permissible uncompensated acceleration for passenger trains (0.7 m/s 2 ), but also setting up the permissible uncompensated acceleration for freight trains (±0.3 m/s 2 ) (Povilaitienė, Laurinavičius 2004), which is included in formulae 11and 12, ensures that the superelevation calculated according to this method will secure the lowest uncompensated lateral acceleration.…”

Section: Analysis and Evaluation Of Modelling Resultsmentioning

confidence: 99%

“…In this paper, we analyse the applied methodology for calculation of the superelevation and seek to identify its shortcomings. We also employ our earlier published research results (Gailienė 2012;Povilaitienė, Laurinavičius 2004;Povilaitienė 2004) to make recommendations for improvement of the methodology for calculation of the superelevation. This way we seek to make the railway traffic safer and more comfortable and to ensure the least possible wear of the rail.…”

Section: Introductionmentioning

confidence: 99%

Approach to Rational Calculation of Superelevation in Dual Gauge Track

2018

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One of the technical possibilities to solve a gauge crossing is to install a dual gauge. This solution has several advantages and disadvantages discussed in this paper. Lack of experience of maintenance and lack of standards for the design of dual track are among the most important disadvantages. The wheel and rail interface on track curves is more difficult than in straight sections. Therefore, the subject of the present article is a geometrical parameter of dual gauge track, i.e., the rail superelevation, which has an impact on the wheel–rail interaction at curves and influences the value of uncompensated acceleration, occurring when a train passes a curve, and, consequently, the intensity of rail wear. The objective of the present article is to analyse the features of dual gauge track and the superelevation calculation methodology considered, to present the approach to rational calculation of superelevation for dual gauge track of Šeštokai–Mockava (Lithuania–Poland) using several calculation versions as well as to make recommendations for the calculation of superelevation.

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“…Sometimes, already knowing the factors that have been determined by many researches and have a negative impact on rail wear in the curves and traffic safety (derailment probability), new researches are carried out to choose one or several geometric parameters such as the research object and to evaluate their design and supervision peculiarities (Wolf 2006;Klauser 2005). Research on the intensive formation of external rail side wear in the curve points to the following factors: uncontrolled (railway line plan and profile), partially controlled (train weight, axial loads) and controlled (train speed, rail and wheel steel toughness, wheel and rail lubrication, superelevation, gauge) (Povilaitienė, Laurinavičius 2004). Researches remain topical and necessary, because expenses concerning the maintenance of track geometry are high in all countries (Bouch et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Investigation Into the Calculation of Superelevation Defects on Conventional Rail Lines

Gailiene

2012

Transport

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Railway curves have influence on train speed on a curve and/or wheel/rail interface. Additional forces that have to be compensated appear in the curves. The purpose of superelevation is to compensate acceleration emerging in the curve thus assuring comfortable passenger transportation and equal wearing of both rails. However, it is very difficult to calculate superelevation when designing and maintaining a railway track, because the estimation of actual train speed on the curves is very complicated. As we know, railway lines can be divided into conventional, high speed and heavy haul ones. As these lines are absolutely different, requirements for the installation and maintenance of the track may also differ. Conventional rail lines are the object of research discussed in this article. The speed of freight and passenger trains is different on conventional rail lines, which is an essential factor in determining superelevation. On the ground of scientific researches, the article analyzes and evaluates the factors influencing wheel/rail interface on the curves. The paper also deals with railway line curves, superelevation and uncompensated lateral acceleration. The article presents the method used in Lithuania for calculating superelevation in the railway curves and analyzes calculation defects. For research purposes, analytical and statistical methods have been used. The obtained results have shown that actual superelevation in the researched curves does not match the calculated one. The calculations and obtained results of superelevation depend on how average train speed in the curves is estimated and used for calculations. As most of the results show that even small variations in the curve have a great influence on track/vehicle behaviour, it is necessary to find more precise methods for calculating superelevation, evaluating actual train speed and considering permissible uncompensated lateral acceleration in the curves.

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Reduction of external rail wearing on road curves

Cited by 6 publications

References 3 publications

A stochastic model for the estimation of renewal periods of sharply curved metro rails

A stochastic model for the estimation of renewal periods of sharply curved metro rails

Approach to Rational Calculation of Superelevation in Dual Gauge Track

Investigation Into the Calculation of Superelevation Defects on Conventional Rail Lines

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