Relevant bibliographies by topics / Rail contact / Dissertations / Theses
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Dissertations / Theses on the topic 'Rail contact'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

McNeal, Cedric J. "Barrel wear reduction in rail guns : the effects of known and controlled rail spacing on low voltage electrical contact and the hard chrome plating of copper-tungsten rail and pure copper rails /." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FMcNeal.pdf.

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Thesis (M.S. in Applied Physics)--Naval Postgraduate School, June 2003.<br>Thesis advisor(s): William B. Maier II, Richard Harkins. Includes bibliographical references (p. 45-46). Also available online.
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2

Smith, Lindsey. "Rolling contact fatigue in wheel-rail contact." Thesis, University of Newcastle Upon Tyne, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438385.

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3

Zhu, Yi. "Adhesion in the wheel-rail contact." Doctoral thesis, KTH, Tribologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-133342.

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To attract more customers and compete with other modes of transportation, railway transport needs to ensure safety, punctuality, high comfort, and low cost; wheel–rail adhesion, i.e., the transmitted tangential force in the longitudinal direction during driving and braking, plays an important role in all these aspects. Adhesion needs to be kept at a certain level for railway operation and maintenance. However, wheel−rail contact is an open system contact. Different contaminants can present between the wheel and rail surfaces, forming a third-body layer that affects the adhesion. Prediction of
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4

Saulot, Aurélien Berthier Yves Descartes Sylvie. "Analyse tribologique du contact roue-rail." Villeurbanne : Doc'INSA, 2006. http://docinsa.insa-lyon.fr/these/pont.php?id=saulot.

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5

Galas, Radovan. "Friction Modification within Wheel-Rail Contact." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-367508.

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Předložená disertační práce se zabývá experimentálním studiem modifikátorů tření a maziv pro temeno kolejnice, které jsou aplikovány do kontaktu kola a kolejnice za účelem optimalizace adheze a redukce hluku. Hlavním cílem práce bylo objasnit vliv aplikovaného množství a složení těchto látek na adhezi v kontaktu. Hlavní pozornost byla věnována zejména potencionálním hrozbám souvisejících s kriticky nízkou adhezí, která může nastat po aplikaci těchto látek. Experimentální studium probíhalo v laboratorních i reálných podmínkách, konkrétně v tramvajovém provozu. V případě laboratorních experiment
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6

Pang, Tao, and tony_pang@hotmail com. "Studies on Wheel/Rail Contact – Impact Forces at Insulated Rail Joints." Central Queensland University. Centre for Railway Engineering, 2008. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20080410.154708.

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To investigate the wheel/rail contact impact forces at insulated rail joints (IRJs), a three-dimensional finite element model and strain gauged experiments are employed and reported in this thesis. The 3D wheel/rail contact-impact FE model adopts a two-stage analysis strategy in which the wheel-IRJ railhead contact is first established in the static analysis and the results transferred to dynamic analysis for impact simulations. The explicit FE method was employed in the dynamic analysis. The Lagrange Multiplier method and the Penalty method for contact constraint enforcement were adopted for
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7

Martin, Michael. "The Effect of Geometrical Contact Input to Wheel-Rail Contact Model." Thesis, KTH, Spårfordon, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-239735.

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Wheel-rail contact is an important aspect of railway, the forces transferred between the wheel and rail are the one that guide, brake, or accelerate the train, and that is why the understanding of the contact between wheel and rail is an interesting research topic. In this master thesis wheel-rail contact model named ANALYN is used to see the effect of the different geometrical input, like undeformed distance, relative longitudinal curvature, and relative lateral curvature calculation affect the contact patch estimation formed at the wheel-rail contact.  In the process, a geometrical contact s
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8

Wickramasinghe, Munidasa Widhana Pathiranage Isuru Udara. "Investigation of surface ratchetting due to rail/wheel contact." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/67800/1/Munidasa%20Widhana%20Pathiranage%20Isuru%20Udara_Wickramasinghe_Thesis.pdf.

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This project advances the knowledge of rail wear and crack formation due to rail/wheel contact in Australian heavy-haul railway lines. This comprehensive study utilised numerous techniques including: simulation using a twin-disk test-rig, scanning electron microscope particle analysis and finite element modeling for material failure prediction. Through this work, new material failure models have been developed which may be used to predict the lifetime and reliability of materials undergoing severe contact conditions.
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9

Jon, Sundh. "On wear transitions in the wheel-rail contact." Doctoral thesis, KTH, Maskinkonstruktion (Avd.), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11563.

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Wear transitions in the wheel–rail contact are of increasing interest since the general trend in railway traffic is toward increased velocities and axle loads. Curving increases the risk of flanging, causing the contact to change from an almost pure rolling wheel tread–rail head contact to more of a sliding wheel flange–rail gauge contact on the high rail in curves. Under wheel flange–rail gauge contact conditions, wear transitions to severe or catastrophic wear will occur if the contact is improperly lubricated. Such a transition is the most undesirable transition in the wheel–rail contact, a
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10

Shahzamanian, Sichani Matin. "Wheel-rail contact modelling in vehicle dynamics simulation." Licentiate thesis, KTH, Spårfordon, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-127949.

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The wheel-rail contact is at the core of all research related to vehicle-track interaction. This tiny interface governs the dynamic performance of rail vehicles through the loads it transmits and, like any high stress concentration zone, it is subjected to serious damage phenomena. Thus, a clear understanding of the rolling contact between wheel and rail is key to realistic vehicle dynamic simulation and damage analyses. In a multi-body-system simulation package, the essentially demanding contact problem should be evaluated in about every millisecond. Hence, a rigorous treatment of the contact
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11

Carroll, Robert Ian. "Surface metallurgy and rolling contact fatigue of rail." Thesis, University of Sheffield, 2006. http://etheses.whiterose.ac.uk/14639/.

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This thesis presents the results of an investigation into the effect of surface metallurgy on the rolling contact fatigue behaviour of rail. The investigation has used laboratory based rolling/sliding twin disc testing of samples with a surface metallurgical feature simulated on them. The samples used in laboratory testing have been compared with samples of rail removed from track. Two surface metallurgical features have been investigated: decarburisation and white etching layer. Decarburisation is the loss of carbon from the surface of the rail due to oxidation at high temperatures, resulting
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12

Sato, Meiji. "Wear and rolling contact fatigue of rail steels." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1335372747.

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13

Duan, FangFang. "Numerical tribology of the wheel-rail contact : Application to corrugation defect." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0019/document.

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Depuis plus d'un siècle, l’usure ondulatoire représente un des problèmes de maintenance les plus important pour les réseaux ferroviaires. Celle-ci est à l’origine d’émissions sonores incommodantes pour le voisinage et de vibrations structurelles pouvant réduire la durée de vie des infrastructures et matériels ferroviaires. Ce phénomène périodique présent à la surface des rails est intimement lié à la dynamique du contact roue-rail qui résulte des paramètres régissant le frottement, la dynamique du train et de la voie… Afin de mieux appréhender les conditions menant à l’apparition de l’usure on
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14

Zhu, Yi. "Adhesion in the wheel-rail contact under contaminated conditions." Licentiate thesis, KTH, Tribologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-48441.

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Railway vehicles require a certain level of adhesion between wheel and rail to operate efficiently, reliably, and economically. Different levels of adhesion are needed depending on the vehicle running conditions. In the wheel tread–railhead contact, the dominant problem is low adhesion, as low adhesion on the railhead negatively affects railway operation: on one hand, the vehicle will lose traction resulting in delay when driving on low-adhesion tracks; on the other hand, low adhesion during deceleration will extend the braking distance, which is a safety issue. This thesis examines the influe
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15

Qiu, Xiaonong. "Rolling contact fatigue behavior of three eutectoid rail steels /." Full text open access at:, 1987. http://content.ohsu.edu/u?/etd,153.

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16

Zhou, Yongji. "System-on-chip accelerator of wheel-rail contact laws." Thesis, University of Leeds, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531591.

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17

Yao, C. W. "Experimental methods for measurement of wheel and rail contact." Thesis, University of Sheffield, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500083.

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18

Hosseini, SayedMohammad. "A Statistical Approach to Modeling Wheel-Rail Contact Dynamics." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/101864.

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The wheel-rail contact mechanics and dynamics that are of great importance to the railroad industry are evaluated by applying statistical methods to the large volume of data that is collected on the VT-FRA state-of-the-art roller rig. The intent is to use the statistical principles to highlight the relative importance of various factors that exist in practice to longitudinal and lateral tractions and to develop parametric models that can be used for predicting traction in conditions beyond those tested on the rig. The experiment-based models are intended to be an alternative to the classical t
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19

Shahzamanian, Sichani Matin. "On Efficient Modelling of Wheel-Rail Contact in Vehicle Dynamics Simulation." Doctoral thesis, KTH, Spårfordon, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-181691.

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The wheel-rail contact is at the core of all research related to vehicletrackinteraction. This tiny interface governs the dynamic performanceof rail vehicles through the forces it transmits and, like any high stressconcentration zone, it is subjected to serious damage phenomena. Thus,a clear understanding of the rolling contact between wheel and rail is keyto realistic vehicle dynamics simulation and damage analysis. In a multi-body dynamics simulation, the demanding contact problemshould be evaluated at about every millisecond for several wheel-rail pairs.Hence, a rigorous treatment of the co
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20

Spangenberg, Ulrich. "Reduction of rolling contact fatigue through the control of the wheel wear shape." Thesis, University of Pretoria, 2017. http://hdl.handle.net/2263/62796.

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Heavy haul railway operations permit the transport of huge volumes at lower cost than other modes of transport. The low cost can only be sustained if the maintenance costs associated with such railway operations are minimised. The maintenance costs are mainly driven by wheel and rail damage in the form of wear and rolling contact fatigue (RCF). Low wear rates in the wheel-rail interface have resulted in an increase in the prevalence of rail RCF, thereby increasing rail maintenance costs. The aim of this study is to develop an approach to reduce rail RCF on South Africa’s iron ore export line b
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21

Shakleton, Philip Andrew. "An optimised wheel-rail contact model for vehicle dynamics simulation." Thesis, Manchester Metropolitan University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515184.

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The wheel-rail interface is a complex component of the dynamic railway vehicle-track system. The wheel-rail interface governs the motion of a railway vehicle and is responsible for wheel and track damage such as wear and rolling contact fatigue. Wheelrail contact models are used extensively in railway engineering to calculate contact forces and stresses, in order to evaluate dynamic vehicle behaviour or assess track damage. Due to the complexity of the wheel-rail interaction, and computational limitations, all wheel-rail contact models make simplifying assumptions so that solutions may be obta
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22

Gallardo, Hernandez Ezequiel Alberto. "Wheel and rail contact simulation using a twin disc tester." Thesis, University of Sheffield, 2009. http://etheses.whiterose.ac.uk/14924/.

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The contact between wheel and rail has been studied for many years in the field and using different test approaches. The wheel/rail contact in this work was simulated by a rolling-sliding twin disc contact machine. Currently this approach is widely accepted as a technique for studying different aspects of the wheel/rail contact such as; wear, rolling contact fatigue (RCF) crack propagation and issues concerning wheel/rail isolation.
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23

Lai, Van-Vuong. "Dynamic model of wheel/rail contact for curve squeal simulation." Thesis, Lille 1, 2018. http://www.theses.fr/2018LIL1I088/document.

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Le bruit de crissement émis par les véhicules guidés sur rail dans les courbes serrées (rayon inférieur à 200 m) est caractérisé par un niveau de pression acoustique élevé et un spectre de raies à moyennes et hautes fréquences. La littérature est riche en modèles de simulation du crissement en courbe. Cependant, le mécanisme d'instabilité est toujours controversé. De plus, les modèles de crissement en courbe existants sont souvent simplifiés (lois de pseudo-glissement analytiques ou hypothèse de massif semi-infini élastique).Le premier objectif de la thèse est de contribuer à la compréhension
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24

ZANI, NICOLA. "Numerical and analytical models applied to wheel-rail contact problems." Doctoral thesis, Università degli studi di Brescia, 2021. http://hdl.handle.net/11379/544084.

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25

Keylin, Alexander. "Analytical Evaluation of the Accuracy of Roller Rig Data for Studying Creepage in Rail Vehicles." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/49607.

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The primary purpose of this research is to investigate the effectiveness of a scaled roller rig for accurately assessing the contact mechanics and dynamics between a profiled steel wheel and rail, as is commonly used in rail vehicles. The established creep models of Kalker and Johnson and Vermeulen are used to establish correction factors, scaling factors, and transformation factors that allow us to relate the results from a scaled rig to those of a tangent track. �Correction factors, which are defined as the ratios of a given quantity (such as creep coefficient) between a roller rig and a t
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26

Adamy, Mark T. "An investigation of sliding electrical contact in rail guns and the development of grooved-rail liquid-metal interfaces." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA401370.

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Thesis (M.S. in Applied Physics) Naval Postgraduate School, December2001.<br>Thesis Advisor(s): Maier, II, William B. "December 2001." Includes bibliographical references (p. 25-29). Also available online.
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27

Reddy, Venkatarami. "Modelling and analysis of rail grinding and lubrication strategies for controlling rolling contact fatigue (RCF) and rail wear." Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15864/1/Venkatarami_Reddy_Thesis.pdf.

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Rails play a significant role in transport of goods and passengers. In Australia railway transport industry contributes 1.6% of GDP with goods and services worth $AUD 8 billion each year which includes $ AUD 0.5 billion per year in exports (Australasian Railway Authority Inc, 2002). Rail track maintenance plays an important role in reliability and safety. The Office for Research and Experiments (ORE) of the Union International des Chemins de Fer (UIC) has noted that maintenance costs vary directly (60-65 per cent) with change in train speed and axle load. It was also found that the increase
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28

Reddy, Venkatarami. "Modelling and analysis of rail grinding and lubrication strategies for controlling rolling contact fatigue (RCF) and rail wear." Queensland University of Technology, 2004. http://eprints.qut.edu.au/15864/.

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Rails play a significant role in transport of goods and passengers. In Australia railway transport industry contributes 1.6% of GDP with goods and services worth $AUD 8 billion each year which includes $ AUD 0.5 billion per year in exports (Australasian Railway Authority Inc, 2002). Rail track maintenance plays an important role in reliability and safety. The Office for Research and Experiments (ORE) of the Union International des Chemins de Fer (UIC) has noted that maintenance costs vary directly (60-65 per cent) with change in train speed and axle load. It was also found that the increase
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29

Sundh, Jon. "An experimental study on wear transitions in the wheel-rail contact /." Stockholm : Institutionen för maskinkonstruktion, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4389.

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30

Tyfour, Wa'il Radwan Ali. "Interaction between wear and rolling contact fatigue in pearlitic rail steels." Thesis, University of Leicester, 1995. http://hdl.handle.net/2381/34715.

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The work presented in this thesis is aimed at investigating the interaction between wear and rolling contact fatigue, which are two of the most serious forms of deterioration caused by the wheel on rail contact stresses. Wheel-rail contact conditions were simulated by a two disc contact using the LEROS (LEicester university ROlling-Sliding wear testing machine). Investigation of the wear behaviour of BS11 pearlitic rail steel showed that steady state wear behaviour is established after a certain number of rolling-sliding cycles. Contact surface failure by ratchetting (accumulation of unidirect
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31

CHOLLET, HUGHES. "Etude en similitude mecanique des efforts tangents au contact roue-rail." Paris 6, 1991. http://www.theses.fr/1991PA066069.

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Le premier chapitre de cet ouvrage est consacre a la methodologie de la similitude mecanique, appliquee plus particulierement a la dynamique de mecanismes discrets, etendue a celle des systemes continus lorsque sont conserves les materiaux. Ce point cle implique la conservation des contraintes, donc la division des accelerations, y compris celle de la pesanteur, par le facteur d'echelle. Differentes extensions a d'autres domaines de la mecanique s'en deduisent. Les chapitres 2 et 3 sont consacres a l'etude quasi-statique du contact roue-rail, les forces et pseudo-glissements ayant ete mesures
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32

Hussain, I. "Multiple model based real time estimation of wheel-rail contact conditions." Thesis, University of Salford, 2012. http://usir.salford.ac.uk/38094/.

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The issue of low adhesion between the wheel and the rail has been a problem for the design and operation of the railway vehicles. The level of adhesion can be influenced by many different factors, such as contamination, climate, and vegetation, and it is extremely difficult to predict with certainty. Changes in the adhesion conditions can be rapid and short-lived, and values can differ from position to position along a route, depending on the type and degree of contamination. All these factors present a significant scientific challenge to effectively design a suitable technique to tackle this
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33

Nicodeme, Claire. "Evaluation de l'adhérence au contact roue-rail par analyse d'images spectrales." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEM024/document.

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L’avantage du train depuis sa création est sa faible résistance à l’avancement du fait du contact fer-fer de la roue sur le rail conduisant à une adhérence réduite. Cependant cette adhérence faible est aussi un inconvénient majeur : étant dépendante des conditions environnementales, elle est facilement altérée lors d’une pollution du rail (végétaux, corps gras, eau, etc.). Aujourd’hui, les mesures prises face à des situations d'adhérence dégradée impactent directement les performances du système et conduisent notamment à une perte de capacité de transport. L’objectif du projet est d’utiliser l
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34

Saint-Aimé, Loïc. "Simulation numérique transitoire de la sollicitation cyclique du contact roue-rail." Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10227/document.

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Sous l’effet des sollicitations mécaniques répétées induites par les passages des trains, on observe l’apparition de fissures de fatigue de contact dans les rails. Une fois amorcées, celles-ci peuvent se propager et mener à la rupture du rail. Dans un contexte d’intensification du trafic, l’optimisation de la politique de maintenance devient stratégique pour les entreprises du transport ferroviaire. Dans ce contexte, un modèle 3D éléments finis du contact roue/rail en courbe a été développé pour reproduire les mécanismes d’amorçage des fissures "Head Check". Ce modèle permet de simuler la soll
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35

Buckley-Johnstone, Luke. "Wheel/rail contact tribology : characterising low adhesion mechanisms and friction management products." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/17291/.

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Friction management and control of adhesion at the wheel/rail interface is vital for an efficient and cost effective railway network. The understanding of how the friction management products (grease and friction modifiers) work and effectively test these products is necessary to improve the performance of a railway network. The papers presented concern the effective benchmarking of wayside curve lubricants (grease) in a twin disc test rig. They compare the effectiveness of several greases in respect to adhesion, wear protection and retentivity (number of cycles of adequate lubrication). A new
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36

BOZZONE, MICHELANGELO. "Dynamic analysis of railway systems using computationally efficient wheel-rail contact models." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2010. http://hdl.handle.net/2108/1332.

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La presente tesi descrive l’analisi dinamica condotta su un sistema ferroviario quale una sala , un carrello e un vagone. La posizione dei punti di contatto tra la ruota e la rotaia è determinata tramite lo studio delle posizioni di equilibrio della sala poggiata su una coppia di rotaie. L’analisi permette anche di determinare la normale e le curvature principali delle superfici della ruota e della rotaia nei punti di contatto. Al fine di ridurre i tempi di calcolo, i risultati dello studio sono stati memorizzati in una tabella di calcolo usata per l’analisi dinamica della sala, del carrell
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37

Enblom, Roger. "On Simulation of Uniform Wear and Profile Evolution in the Wheel - Rail Contact." Doctoral thesis, Stockholm : Dept. of aeronautics and vehicle engineering, Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4184.

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38

Rinaldi, Elisa. "3D Finite Element Analysis of Wheel/Rail normal contact problem using ANSYS software." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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La meccanica del contatto fra ruota ferroviaria e rotaia, è una delle più importanti aree di studio nell’Ingegneria Ferroviaria. Ad oggi, un vasto numero di formulazioni analitiche sono state proposte dai ricercatori, con lo scopo di valutare i parametri di contatto tra ruota e rotaia ed arrivare ad una descrizione affidabile delle forze che agiscono nell’area di contatto. Comunque, solo alcuni dei metodi disponibili permettono di considerare, nelle loro elaborazioni, la reale geometria di contatto tra ruota e rotaia o la non linearità delle proprietà dei materiali impiegati. Un’alternativa ai
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39

White, Ben. "Using tribo-chemistry analysis to understand low adhesion in the wheel-rail contact." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/21007/.

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Low adhesion between wheel and rail is a recurrent problem for the rail industry. Low adhesion can lead to wheel slides and slips during acceleration and deceleration, which can cause large amounts of damage to the wheel and rail as well as causing safety issues and delays if a train cannot accelerate or decelerate when necessary. Adhesion in the wheel-rail contact is affected by the third body layer which is present in the contact patch between wheel and rail. It is composed naturally from steel wear debris and iron oxides, but often contains other contaminants such as organic matter, ballast
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40

Lewis, Stephen Robert. "Measurement, control and enhancement of friction/traction in a simulated wheel/rail contact." Thesis, University of Sheffield, 2011. http://etheses.whiterose.ac.uk/12868/.

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The focus on rail transportation has shifted in recent years to be a viable alternative to road based means of travel and freight distribution. With a finite stockpile of the world's natural hydrocarbon based fuels and ever increasing road congestion, rail research has become a prime topic of late. In this thesis the focus has been on the wheel/rail contact and the measurement of rail head friction. The initial project was the development of an alternative technique to measure railhead friction. Adhesion loss is a major problem on railways around the world and is common during the autumn, at t
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41

Saulot, Aurélien. "Analyse tribologique du contact roue-rail : modélisation et expérimentations : cas de l'usure ondulatoire." Lyon, INSA, 2005. http://theses.insa-lyon.fr/publication/2005ISAL0115/these.pdf.

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Depuis plus d'un siècle, les rails des transports urbains ferrés (tramways, métros) sont affectés d'une usure périodique de leur surface de contact appelée "usure ondulatoire". Lors du passage d'un train sur une voie en étant affectée, il apparaît d'importantes nuisances sonores et vibratoires dont les niveaux dépassent fréquemment les normes fixées par la loi. Les réseaux urbains sont alors contraints de procéder à des opérations coûteuses et répétées d'abrasion mécanique de la surface des rails par meulage, actuellement le seul moyen efficace de contrôle du développement de l'usure ondulatoi
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42

Simon, Samuel. "De la dynamique ferroviaire à l’accommodation microstructurale du rail : Contribution des TTS à la réponse tribologique des aciers : Cas du défaut de squat." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0028/document.

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Le squat est un défaut de fatigue de contact apparaissant à la surface du rail et dont le mécanisme d’amorçage est mal compris. Afin de pallier ce manque, une analyse tribologique locale de la bande de roulement du rail est mise en oeuvre à proximité d’un squat naissant. Cette caractérisation révèle une anisotropie importante des couches superficielles du rail associée aux développements de Transformations Tribologiques Superficielles. Ces résultats témoignent de conditions de contact roue/rail particulières dans la zone d’étude, notamment d’un niveau d’efforts de cisaillement inhabituel pour
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43

Merino, Pierrick. "Reproduction expérimentale du contact roue-rail à échelle réduite : Voies de formation des sources de défauts." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI101.

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Face au développement du transport ferroviaire, la sécurité demeure la principale préoccupation des exploitants de réseaux ferrés. En particulier, la compréhension des phénomènes sources des défauts de fatigue de roulement (RCF) mettant en jeu l’intégrité du rail, est nécessaire pour limiter les risques d’accidents. La phase blanche, associée à la formation du défaut de squat, est difficile à reproduire mécaniquement en laboratoire. L’utilisation de bancs d’essai permet de reproduire plusieurs aspects du contact roue-rail selon des critères choisis, mais nécessite de faire des compromis. Le ba
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44

Mai, Si Hai. "Etude de dégradation des voies ferrées urbaines." Phd thesis, Université Paris-Est, 2011. http://pastel.archives-ouvertes.fr/pastel-00659068.

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Ce travail réalisé dans le cadre d'une collaboration industrielle avec la société ALSTOM Transport porte sur l'étude de la dégradation des voies ferrées urbaines. Les composantes de voie retenus pour cette étude sont le rail et la dalle de voie en béton. Concernant le rail, différents problèmes sont abordés : contact roue - rail, usure du rail, usure ondulatoire du rail, et fatigue de contact de roulement (RCF) du rail. Un outil numérique avec des interfaces graphiques, nommé CONUS, est développé pour le problème de contact roue - rail et le problème d'usure du rail. Des théories classiques (H
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Lundberg, Oskar Erik. "Vibrations induced by surface roughness in nonlinear rolling contacts." Licentiate thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-155049.

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For efficient transportation in either trains, busses or passenger cars, rolling elements such as wheels, tyres, bearings and transmission elements are fundamental. The energy efficiency and the generation of noise and vibrations in rolling contacts depend on the surface roughness of contacting bodies. In order to optimize the surfaces of rolling elements, prediction of its impact on the dynamic response from rolling excitation is required. A computationally efficient method to include surface roughness in the modelling of rolling contacts is presented. More specifically, nonlinear effects on
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Moas, Eduardo. "Investigation of the finite element method for computing wheel/rail contact forces in steady curving." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/50064.

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The understanding of rail vehicle steady-state and dynamic curving has increased substantially in the last few years. Contemporary curving models include such nonlinear effects as two-point contact, creep force saturation, and rail flexibility. The usual approximation concerning the contact geometry is that the Iocalized wheel and rail curvatures at the center of the contact patch are constant throughout the contact patch. This approximation allows computation of contact stresses using Hertzian theory, and it allows the computation of contact patch forces using one of Kalker’s theories.
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Wrobel, Shannon Alicia. "Multi-Function LIDAR Sensors for Non-Contact Speed and Track Geometry Measurement in Rail Vehicles." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23134.

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A Doppler LIght Detection And Ranging (LIDAR or lidar) system is studied for the application of measuring train ground speed in a non-contacting manner, as an alternative to the current train speed measurement devices such as wheel-mounted tachometers or encoders. The ability to accurately measure train speed and distance is a critical part of monitoring track geometry conditions.<br />Wheel-mounted tachometer speed measurements often fluctuate due to wheel vibrations, change in wheel diameter, or wheel slip affecting the measurement accuracy.  Frequent calibrations are needed to account for c
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Meymand, Sajjad Zeinoddini. "State of the Art Roller Rig for Precise Evaluation of Wheel-Rail Contact Mechanics and Dynamics." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/64920.

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The focus of this study is on the development of a state-of-the-art single-wheel roller rig for studying contact mechanics and dynamics in railroad applications. The use of indoor-based simulation tools has become a mainstay in vehicle testing for the automotive and railroad industries. In contrast to field-testing, roller rigs offer a controlled laboratory environment that can provide a successful path for obtaining data on the mechanics and dynamics of railway systems for a variety of operating conditions. The idea to develop a laboratory test rig started from the observation that there is a
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Zong, Nannan. "Development of optimal designs of insulated rail joints." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/61125/1/Nannan_Zong_Thesis.pdf.

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Proper functioning of Insulated Rail Joints (IRJs) is essential for the safe operation of the railway signalling systems and broken rail identification circuitries. The Conventional IRJ (CIRJ) resembles structural butt joints consisting of two pieces of rails connected together through two joint bars on either side of their web and the assembly is held together through pre-tensioned bolts. As the IRJs should maintain electrical insulation between the two rails, a gap between the rail ends must be retained at all times and all metal contacting surfaces should be electrically isolated from each
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Kothari, Karan. "Accurate Wheel-rail Dynamic Measurement using a Scaled Roller Rig." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/96633.

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The primary purpose of this study is to perform accurate dynamic measurements on a scaled roller rig designed and constructed by Virginia Tech and the Federal Railroad Administration (VT-FRA Roller Rig). The study also aims at determining the effect of naturally generated third-body layer deposits (because of the wear of the wheel and/or roller) on creep or traction forces. The wheel-rail contact forces, also referred to as traction forces, are critical for all aspects of rail dynamics. These forces are quite complex and they have been the subject of several decades of research, both in experi
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