Theoretical study into efficiency of the improved longitudinal profile of frogs at railroad switches

Kovalchuk, Vitalii; Sysyn, Mykola; Sobolevska, J.; Nabochenko, Olga; Parneta, Bogdan; Pentsak, Andriy

doi:10.15587/1729-4061.2018.139502

Cited by 12 publications

(12 citation statements)

References 3 publications

(4 reference statements)

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“…Another factor relates to the occurrence of gaps under the sleepers, that is, a total or partial loss of backing of the sleepers on the ballast. Occurrence of the gap is particularly noticeable in a track with significant local vibrational and dynamic loads in such locations as rail joints, swithes with a rigid bar or short isolated unevenness of the rolling surface [6]. Stress growth in the neighboring sleepers relative to the sleepers with gaps arises as a result of redistribution of loads by the rail-and-sleeper grid.…”

Section: розроблено метод розрахунку розладнання геометрIї колIї пIд mentioning

confidence: 99%

Studying the railroad track geometry deterioration as a result of an uneven subsidence of the ballast layer

Nabochenko¹,

Sysyn²,

Kovalchuk³

et al. 2019

EEJET

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Section: розроблено метод розрахунку розладнання геометрIї колIї пIд mentioning

confidence: 99%

Studying the railroad track geometry deterioration as a result of an uneven subsidence of the ballast layer

Nabochenko¹,

Sysyn²,

Kovalchuk³

et al. 2019

EEJET

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“…The ballast bed bears significant forces and plays important role in load carrying «chain». Each part of the track receives static and dynamic effects in different proportions [1,2,50,52]. The forces and stresses do not transmit consistently in the «sleeper-ballast bed» interface, as well as «grain-grain» connections in the ballast bed.…”

Section: Purposementioning

confidence: 99%

“… dead weight loading (according to the authors' analysis, it is negligible),  vehicle forces and effects (on perfect or quite perfect quality track),  previous geometric and/or structural features on defective track (defects of track geometry, «hammering» of rails at rail joints, defects of weld-ing…etc.) [1,2,4,38,39,40,41,50,52],  natural and environmental effects (freeze, melt, sunshine, rain, wind, flood, etc. ),  effects at turnouts caused be railway vehicles [50,52],  effects at level crossing caused by road vehicles,  effects of tamping machines' hammers during operation,  other relevant effects (e.g.…”

Section: Purposementioning

confidence: 99%

“…[1,2,4,38,39,40,41,50,52],  natural and environmental effects (freeze, melt, sunshine, rain, wind, flood, etc. ),  effects at turnouts caused be railway vehicles [50,52],  effects at level crossing caused by road vehicles,  effects of tamping machines' hammers during operation,  other relevant effects (e.g. other vehicle effects, etc.)…”

Section: Purposementioning

confidence: 99%

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Specific Evaluation Methodology of Railway Ballast Particles’ Degradation

Juhász

Fischer

2019

STP

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Purpose. The most railway lines in the world have so called traditional ballasted superstructure. The authors think that it is important to learn about the process of ballast degradation. There are only two types of standardized laboratory test methods in the EU to assess railway ballast particle degradation and describe the rock physic characteristics, but are not suitable for modelling the railway stress-strain circumstances of ballast materials, and they particles. In this paper the authors represent some conclusions from their research that the authors experienced during their individual fatigue laboratory test and from new additional tests. With these kind of testing methods, the deterioration process of railway ballast particles can be assessed more realistic and precisely. Methodology and new directions. There are two types of laboratory tests which are presented in this article. The first one was performed by using a shear box with a special layer structure that is loaded by dynamic, pulsating force; while the second one was executed by using a 140 mm diameter HDPE tube with its original closing element that is loaded by ZD-40 machine. Findings and problems. There is a development after the R&D work made and published in 2014, in 2017 and 2018 years the ballast particle deterioration process is given according to more intermediate fatigue cycles with individual measurements that show more precise «picture» about the full particle degradation, i.e. breakage process. The authors give more accurate correlation functions between the calculated parameters and load cycles during fatigue. However, there are many factors in the test that need to be improved in the future. Therefore, the authors have discovered other additional tests. Originality. The most important goal of the authors that supplement the currently used regulation with new measurement methods. Practical value The authors' developed and new methods may serve as a basis for a future instruction or regulation. The publishing of this paper was supported by EFOP 3.6.1-16-2016-00017 project.

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“…The most of on-board measurement systems are based on inertial measurements of accelerations on axle-box or car bodies [3]. On-board inertial measurement system ESAH-F [4] At present, there are a lot of studies related to the application of track condition monitoring systems [5][6][7][8][9]. The paper deals with the inertial measurements of the system ESAH-F (Electronic Analysis System of Crossing -Portable) that is tested on German railways (DB AG).…”

Section: Introductionmentioning

confidence: 99%

Common Crossing Condition Monitoring With on Board Inertial Measurements

et al. 2019

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A railway turnout is an element of the railway infrastructure that influences the reliability of a railway traffic operation the most. The growing necessity for the reliability and availability in the railway transportation promotes a wide use of condition monitoring systems. These systems are typically based on the measurement of the dynamic response during operation. The inertial dynamic response measurement with on-board systems is the simplest and reliable way of monitoring the railway infrastructure. However, the new possibilities of condition monitoring are faced with new challenges of the measured information utilization. The paper deals with the condition monitoring of the most critical part of turnouts - the common crossing. The application of an on-board inertial measurement system ESAH-F for a crossing condition monitoring is presented and explained. The inertial measurements are characterized with the low correlation of maximal vertical accelerations to the lifetime. The data mining approach is used to recover the latent relations in the measurement’s information. An additional time domain and spectral feature sets are extracted from axle-box acceleration signals. The popular spectral kurtosis features are used additionally to the wavelet ones. The feature monotonicity ranking is carried out to select the most suited features for the condition indicator. The most significant features are fused in a one condition indicator with a principal component analysis. The proposed condition indicator delivers an almost two-time higher correlation to the lifetime as the maximal vertical accelerations. The regression analysis of the indicator to the lifetime with an exponential fit proves its good applicability for the crossing residual useful life prognosis.

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Theoretical study into efficiency of the improved longitudinal profile of frogs at railroad switches

Cited by 12 publications

References 3 publications

Studying the railroad track geometry deterioration as a result of an uneven subsidence of the ballast layer

Studying the railroad track geometry deterioration as a result of an uneven subsidence of the ballast layer

Specific Evaluation Methodology of Railway Ballast Particles’ Degradation

Common Crossing Condition Monitoring With on Board Inertial Measurements

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