The Basis of Mathematical Description for Wave Model of Stresses Propagation in Railway Track

Kurhan, Dmytro

doi:10.15802/stp2016/84032

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…To solve this problem, a spatial model of dynamic deformations of the railway track based on the elasticity theory [13,19] was applied. One of the basic elements of such a model is to determine the geometry of stress propagation (and appropriate deformations) in the half-space of the railway track from the action of external load (rolling stock wheels).…”

Section: Theory Of the Methods For Determining The Reduced Massmentioning

confidence: 99%

Research of the Reduced Mass of the Railway Track

Kurhan

Leibuk

2020

Acta Tech. Jaurinensis

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In an overall view, a vehicle is described as a system of bodies interconnected by elastic and dissipative couplings. Bodies have a mass concentrated at a point, the movement of which describes their motion. Certain difficulties arise when introducing a railway track into such models. While interacting with the rolling stock, the track operates as an elastic body, and its mass is specified as reduced to the point of interaction. The purpose of this work is to provide a reasonable value of the reduced mass of the railway track depending on its parameters. The task is solved by applying a spatial model of dynamic deformations of the railway track on the basis of the elasticity theory. Such an approach makes it possible to determine which part of the railway track interacts with the wheel based on the propagation of deformations as elastic waves.

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Section: Theory Of the Methods For Determining The Reduced Massmentioning

confidence: 99%

Research of the Reduced Mass of the Railway Track

Kurhan

Leibuk

2020

Acta Tech. Jaurinensis

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“…Most of the presented studies are based on DEM modeling that is characterized by an intensive calculation process that limits its application to relatively small samples. However, there are other promising numerical wave propagation approaches studying the whole superstructure, like described in Kurhan (2016); Kurhan and Kurhan 2019). The presented papers on wave propagation relation in granular media consider homogenous stress distribution, but the railway ballast is subjected to the locally inhomogeneous stresses and the corresponding wave propagation effects that are the problems of the further studies.…”

Section: Introductionmentioning

confidence: 99%

Studying the Relation of the Residual Stresses in the Ballast Layer to the Elastic Wave Propagation

Sysyn

Gerber

Liu

et al. 2022

Transp. Infrastruct. Geotech.

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During track construction or ballast bed maintenance, ballast layer compaction quality plays an essential role in the following track irregularity accumulation, its lifecycle, and maintenance costs. The ballast compaction process is characterized by its compaction and the accumulation of the stressed state. The elastic wave propagation methods are an effective way for the identification of the ballast bed compaction properties. The paper presents the theoretical and experimental studies of the ballast consolidation under the vibration loading of the sleeper. The practical laboratory study is given by the 1:2.5 scaled physical model of one sleeper and the corresponding ballast layer box. The measurements of ballast pressure and deformations under the vibration loading in the ballast layer and the photogrammetric recording of the ballast flow are carried out. The measurements demonstrate the accumulation of the residual stresses under the ballast layer. Furthermore, the measurements of elastic wave time of flight (ToF) using the shakers under the sleeper and acceleration sensors under the ballast show the substantial increase of the ToF velocities after the tamping process. Moreover, the distribution of the velocities along the sleeper is spatially inhomogeneous. The numeric simulation using the discrete element method (DEM) of the tamping and the testing processes proves the inhomogeneous wave propagation effect. The modeling shows that the main reason for the wave propagation inhomogeneity is the accumulated residual stress distribution and the minor one – the compaction density. Additionally, a method for identifying wave velocity spatial distribution is developed by wave tracing the inhomogeneous medium. The procedures allow ballast identification in the zones outside the shakers.

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“… At Railway University of Dnipropetrovsk there is a team which researched mainly the evolved stress-strain state of the whole railway track with very sophisticated methods [32] [33] [34] [35]. In the paper [36] they investigated the railway track representation in mathematical model of vehicles movement.…”

Section: Introduction and Literature Reviewmentioning

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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The Basis of Mathematical Description for Wave Model of Stresses Propagation in Railway Track

Cited by 5 publications

References 11 publications

Research of the Reduced Mass of the Railway Track

Research of the Reduced Mass of the Railway Track

Studying the Relation of the Residual Stresses in the Ballast Layer to the Elastic Wave Propagation

FEM Modelling Possibilities of Glued Insulated Rail Joints for CWR Tracks

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