Comparative Analysis of Axlebox Accelerations in Correlation with Track Geometry Irregularities

Ágh, Csaba

doi:10.14513/actatechjaur.v12.n2.501

Cited by 17 publications

(10 citation statements)

References 10 publications

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“…There is other plan to compose FEM models to be able to simulate longer railway track sections with different support characteristics. The results from the longer railway tracks' FEM model are able to be set against the field tests [39] [40] [41] [44].…”

Section: Discussionmentioning

confidence: 99%

FEM Modelling Possibilities of Glued Insulated Rail Joints for CWR Tracks

Major

Fischer

2020

Acta Tech. Jaurinensis

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In this paper the authors detail the possibilities of modelling of finite element method (FEM) of glued insulated rail joints which are applied in railway tracks with continuously welded rails (CWR). A lot of laboratory tests (static and dynamic 3-point bending tests, axial pulling tests) were executed on glued insulated rail joints, the specimens were related to three different rail profiles applied in Hungary: MÁV 48.5; 54E1 (UIC54), 60E1 (UIC60), respectively. The static bending tests with many bay length values were conducted, before and after dynamic (fatigue) tests. 2-D beam models were made in FEM software using semi-rigid hinge as the simplified connection of fishplated glued insulated rail joint. The FEM models were calibrated and then validated with the static vertical displacement values in the middle-bay position measured in laboratory. The model validation was conducted with two methods.

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Section: Discussionmentioning

confidence: 99%

FEM Modelling Possibilities of Glued Insulated Rail Joints for CWR Tracks

Major

Fischer

2020

Acta Tech. Jaurinensis

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“…Several types of mathematical functions have been previously considered, such as splines, polynomials from the 3 rd to 7 th degree, and others. For example, an exponential function with a complex basis was used in [24] precisely to reproduce the track profile in line with the results of measurements by a machine with an asymmetric chord, but for the task of establishing a correlation between accelerations and track geometry.…”

Section: The Function Of Processing Negative Values Of An Arraymentioning

confidence: 99%

Mathematical Support of Machine Surfacing for the Railway Track

Kurhan

Havrylov

2020

Acta Tech. Jaurinensis

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The condition of a railway track is characterized by many indices, including its geometric shape, both in the horizontal and vertical planes. The purpose of this paper is to create a mathematical tool to ensure the operation of track machines for surfacing, tamping, and alignment, which are equipped with automation systems. The developed mathematical model will be integrated into the AS "Strela" software package which is currently installed on machines. Scientific approaches used in the mathematical model allowed to reduce the operation of machines in "window", to simplify the work of maintenance personnel, to create an information base of track parameters, to establish rational parameters of curves during surfacing.

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“…Additional parameters such as vehicle velocity, GPS location and track defect images were monitored. An experimental investigation of the relationship between the irregularities recorded by a conventional track-geometry-measuring car and the resulting dynamic vehicle responses of axle-box accelerometer is presented in the paper [ 27 ]. It was concluded that the differences of the vertical axle-box accelerations and the lateral axle-box acceleration are practicably proportional.…”

Section: Introductionmentioning

confidence: 99%

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

Sysyn

Przybyłowicz

Nabochenko

et al. 2021

Sensors

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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.

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Comparative Analysis of Axlebox Accelerations in Correlation with Track Geometry Irregularities

Cited by 17 publications

References 10 publications

FEM Modelling Possibilities of Glued Insulated Rail Joints for CWR Tracks

FEM Modelling Possibilities of Glued Insulated Rail Joints for CWR Tracks

Mathematical Support of Machine Surfacing for the Railway Track

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

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