Researchers from different countries have been studying the wheelrail contact behavior on turnout switch panels. The presented method is able to consider the relationship between the elastic deformation of a line and the normal pressure distribution within the contact patch. On the influence of conformity on wheelrail rolling. Wheel rail contact mechanics is one of the fundamental areas for studying wheel rail relationship, therefore, the study of wheel rail contact is of great significance to solve related problems. A new wheelrail contact model for railway dynamics.
Application of pressure poured cast wheel technology for european freight service cameron lonsdale, amsted rail. Wheel rail contact mechanics at full scale on the test stand. This treatise is concerned with the stresses and deformation of solid bodies in contact with each other, along curved surfaces which touch initially at a point or along a line. For a fast calculation of vehicletrack dynamics and wheel rail contact mechanics, wheel rail contact geometric gap is usually idealised in elliptic or nonelliptic form. Numerical investigation into the effect of geometric gap. Based on these models, the applicability of the hertz contact theory hct to railwheel contact problems is veri. Contact mechanics issues of a vehicle equipped with. Some applications in rail vehicle dynamics and wear simulation have been outlined. A numerical procedure for analysis of wr contact using. Next he discusses the influence of friction and the topographical roughness of surfaces. New developments in the theory of wheelrail contact mechanics. The wheel rail contact is an open system contact, which is subjected to various environmental conditions, such as temperature, humidity, water, and even leaves.
These proceedings demonstrate the increasing interest and importance of contact mechanics and wear to the railway industry. Ciavarellab,1 adepartment of mechanical engineering and applied mechanics, university of michigan, ann arbor, mi 481092125, usa bdepartment of engineering science, university of oxford, parks road, oxford, ox1 3pj, uk abstract contact problems are central to solid mechanics, because contact is the principal method of applying loads to a. As wheel or rail wear or surface damage takes place the contact patch size and shape will change. Experimental characterization of wheelrail contact patch. The focus of this study is on the development of a stateoftheart single wheel roller rig for studying contact mechanics and dynamics in railroad applications. Presented at the 6th international conference on contact mechanics and wear of rail wheel systems cm2003 in gothenburg, sweden june 10, 2003 submitted to wear journal june 2003 optimal design of wheel profile for railway vehicles i. Electromechanical design and development of the virginia tech. Wheel rail contact mechanics kevin oldknow director, school of sustainable energy engineering simon fraser university. Safety and economy of railway traffic is enormously influenced by the contact stress variation caused by wheel rail contact profile changes. The contact patch size of solid materials is described by the equations of contact mechanics. Contact mechanics analysis of measured wheelrail profiles. The contact area and pressure distribution in a wheel rail contact is essential information required in any fatigue or wear calculations to determine design life, regrinding, and maintenance schedules. In the case of a contact between the standard rail uic60 and the standard wheel uicore, different.
Li, three dimensional finite element solution of wheel rail rolling contact with velocity dependent friction, in proceedings of the 9th international conference on contact mechanics and wear of rail wheel systems cm 12, chengdu. Effects of rail cant on wheelrail contact forces in slab tracks. This produces a prediction of the dynamic contact forces acting on the wheel and the rail. Cad model of rail wheel contact the cad model of rail wheel contact was saved in. The contact between wheel and rail is the constitutive element of railway vehicle dynamics. Li, three dimensional finite element solution of wheelrail rolling contact with velocity dependent friction, in proceedings of the 9th international conference on contact mechanics and wear of railwheel systems cm 12, chengdu, china, august 2012. Modeling of a roller rig for evaluation of wheelrail contact mechanics. In the case of a contact between the standard rail. Iii european conference on computational mechanics solids, structures and coupled problems in engineering c. Mechanics and fatigue in wheelrail contact 1st edition.
Wheel rail contact characteristics on a tangent track vs a roller rig rtdf2012 extracting summit roughness parameters from random gaussian surfaces accounting for asymmetry of the summit heights. This paper is a revised and expanded version of an article entitled, contact stress analysis in wheelrail by hertzian method and finite element method presented in national conference on recent advancements in mechanical engineering held at north east regional institute of science and technology, arunachal pradesh. Firstly, the contact problem between two solid bodies is defined in its general form. A new approach to study the wheelrail contact problem in.
A tool has been developed for contact mechanics analysis of the wheel rail contact. This way, many different wheel rail contact conditions which a wheel or a rail will encounter in. For numeric simulation, the transient wheelrail rolling contact in railway system is a very complex and timeconsuming process. Wheel rail interface handbook download ebook pdf, epub. Effects of rail cant on wheelrail contact forces in slab. Part one provides the fundamentals of contact mechanics, wear, fatigue and lubrication as well as stateoftheart research and emerging technologies related to the wheel rail. Pdf contact mechanics analysis of measured wheelrail profiles. The position of the wheelrail contact, which is typically 1 cm 2 in size, varies continuously as a train progresses down a section of track. Mechanics later needed in treating wheelrail contact. Frictional problems when there is friction at the contact interface, additional conditions are introduced, which considerably complicate the proofs of existence and uniqueness. A robust nonhertzian contact method for wheelrail normal. Continuous observation of wheel rail contact forces in. Hence, the wheelrail rolling contact has been a hot issue.
International journal of mechanics and applications 2011. Classical wheel rail wear has been extensively studied under dry and clean conditions previously. Wheel rail interface handbook is a onestop reference for railway engineering practitioners and academic researchers. Using measurements of wheel and rail profiles as input, the tool is based on the finite element fe code ansys. Pdf wheelrail contact mechanics at full scale on the. Abstracta modified kikpiotrowski mkp model is proposed in this paper for an accurate and robust calculation of wheelrail normal contact problem. New developments in the theory of wheel rail contact mechanics nielsen, jakob birkedal publication date. The kinematics of guidance of the wheelsets is based on the wheels and rails geometries. Determination of wheelrail contact points in the simulation of railway vehicle dynamics j. Analysis of wheelrail contact under partial slip and low.
It has been widely employed in numerous wheel rail contact mechanics related studies, e. To study the influence of interacting wheel and rail profile topology of standard rail uic60, the standard wheel profile as per. The guidance of railway vehicles is determined by a complex interaction between the wheels and rails, which requires a detailed characterization of the contact mechanism in order to permit a correct analysis of the dynamic behavior. Cm2018 1 th international conference on contact mechanics and. P reliminaries fatigue failures of railway wheels applicable, is the in. Determination of wheelrail contact characteristics by. The use of indoorbased simulation tools has become a mainstay in vehicle testing for the automotive and railroad industries. State of the art roller rig for precise evaluation of wheel. The program is designed to calculate the main properties of wheel rail contact zone, such as. Traditionally, two methods have been used to investigate the rail wheel contact, namely hertzs analytical method and kalkers software program contact. Contact department of railway engineering delft university of technology conference website. The first one gives an estimation of the contact forces between wheels and rails because of the movements of the bodies.
Pdf development and advancement in the wheelrail rolling. Forces and damage at the wheel rail contact the accepted parameter 6 involved in wear and rolling contact fatigue of wheel is the wear number w, also known as tgamma, given by. From railway dynamics to wheelrail contact mechanics, an. Part one provides the fundamentals of contact mechanics, wear, fatigue and lubrication.
Application of pressure poured cast wheel technology for. The term adhesion railway is only used when there is need to distinguish adhesion railways from railways moved by other means, e. Modeling of a roller rig for evaluation of wheelrail. Jul 08, 2010 numerical examples of wheel rail contact in point section are presented in order to demonstrate the use of the procedure developed in this investigation and the effect of wheel profiles on the contact configuration in turnout section is discussed. The geometric or kinematical relations of the wheel rail contact and the contact mechanical relations for the calculation of the contact. Contact mechanics of rail wheel systems friction and adhesion at rail wheel interface. Contact mechanics, rolling contact, dynamics, finite element method, stress 1 introduction in studies of railway, wheel rail rolling contact is one of the main issues. The exact position will depend on the wheel and rail profiles and the degree of curvature of the track and whether the wheel is the leading or trailing wheelset on a bogie, as well as other factors determined by the bogie design. Impact of yaw motion of wheelset on wheelrail contact creepage. Cm2018 1 th international conference on contact mechanics. All the influencing factors have to be taken into account as they interact closely.
Pdf a tool has been developed for contact mechanics analysis of the wheelrail contact. The authors in this paper describe the steps of creating a special program in gui tool in matlab. The contact forces developed in the contact are the most important external inputs to the vehicles and the track, and. The 27 contributions succeed in sustaining a balance between mechanics and metallurgy. Wheel rail contact mechanics kevin oldknow director, school of. A change in designed surface topology may result from wear that brings in a wide change in contact geometry and stresses. Reasonable solution method would reduce the computational effort and improve the solution efficiency in a certain extent. Basic tribology of the wheelrail contact sciencedirect. This paper provides a detailed dynamic model of the electromechanical system for a scaled roller rig that is under construction at the railway technology laboratory of virginia tech rtl for accurate study of the mechanics and dynamics at wheel rail interface in railway vehicles. This thesis describes the development of a wheel rail life prediction tool with regard to both wear and surfaceinitiated rcf. The contact patch of a railroad wheel is much smaller than for pneumatic rubber tires.
References flange climb derailment criteria and wheelrail. Effective management of the wheel rail contact is an important aspect of rail infrastructure operations. State of the art roller rig for precise evaluation of. It is applicable to general nonhertzian contact geometries, and to transient as well as to steady state rolling contact problems. Wheelrail interface handbook is a onestop reference for railway engineering practitioners and academic researchers.
The paper established the finite element model of wheel rail rolling contact based on ale method arbitrary lagrangeeuler method in abaqus, and research impact of yaw motion of wheelset on creepage of wheel rail contact. At the time of elkins article, the application of contact mechanics for the description of contact between wheel and rail for vehicletrack models. The rail transit seminar is devoted to examining wheel rail, vehicletrack. Based on these models, the applicability of the hertz contact theory hct to rail wheel contact problems is verified in the present paper. New developments in the theory of wheel rail contact mechanics. Accurate wheelrail dynamic measurement using a scaled. Such measurements require excellent powering and driving architecture, highperformance motion control, accurate measurements, and relatively noisefree data acquisition systems.
Adhesion traction is the friction between the drive wheels and the steel rail. Better understanding of wheel rail interfaces is therefore critical to improving the capacity, reliability and safety of the railway system. Stecco, university of florence, italy abstract the numerical simulation of system dynamics is today a standard in the design. Cm2018 1 ith edition a conference series with a rich history where. This book is a onestop reference for railway engineering practitioners and academic researchers. Pdf new developments in the theory of wheelrail contact mechanics. A simplified model of wheelrail contact mechanics for nonhertzian. A quantitative assessment of the creepcreepage measurements, which is an important metric to evaluate the wheel rail contact mechanics and. Wheel rail engineer for a demonstration of our efforts interest from several other agencies including cta, and mbta in how to better their systems bart wheel rail optimization. This introduction starts in section 1 with a brief overview of fatigue failures of railway wheels. Beside a standard rail, also a crane rail and a switching component are considered in the veri. Contact analysis of the two dimensional wheelrail based on. This formulation also allows the study of lead and lag flange contact scenarios, both fundamental for the analysis of potential derailments or for the study.
Pdf wheel rail interface handbook download ebook for free. The main goal of this phd work was to develop such a tool where vehicletrack dynamics simulations are implemented. Schematization of the wheelrail rolling contact forces. Beside a standard rail, also a crane rail and a switching component are considered in the verification. These unique features originate from the wheel rail. Request pdf wheelrail contact mechanics the scope of this chapter is the modelling of the force balance at the wheel rail interface in railway vehicles. Rolling contact fatigue, wear of rail and wheel, stress distributions on contact patch and dynamic response of railway vehicles are prevalently researched topics, which are related to wheel and rail contact. Continuous observation of wheel rail contact forces in curved track and theoretical considerations akira matsumoto a,yasuhiro sato, hiroyuki ohno, makoto shimizub. Researchers from different countries have been studying the wheel rail contact behavior on turnout switch panels. Pdf on dec 11, 2019, sono bhardawaj and others published development and advancement in the wheelrail rolling contact mechanics. Feasibility study for an ultrasonic sensor for monitoring.
All these environmental factors influence wheel rail wear. The vt roller rig is intended for studying the complex dynamics and mechanics at the wheel rail interface of railway vehicles in a controlled laboratory environment. Purchase mechanics and fatigue in wheelrail contact 1st edition. These two idealisations deviate from the actual one if the lateral combined curvature within the contact patch is not constant or the yaw angle of wheelset exists. Pdf a hertzian contact formulation for the wheelrail contact.
Contact mechanics of railwheel systems ii journal of. It is mainly related to the hardness of the material in terms of youngs modulus. Adhesion in the wheel rail contact under contaminated. Applicability of the hertz contact theory to railwheel.
This industrial complex is used today for cultural festivals and activities, but in this case it will be the location for the 11th edition of contact mechanics. International audiencethis wheel rail contact study presents a combination of two complementary mechanical fields. An approximate analysis for hertzian elliptical wheelrail. Proceedings of the 1st international and 16th national conference on machines and mechanisms inacomm20, iit roorkee, india, dec 1820 20 an approximate analysis for hertzian elliptical wheel rail contact problem jay prakash srivastava department of mechanical engineering. A generic wheelrail contact detection formulation is presented here in order to determine online the contact points, even for the most general threedimensional motion of the wheelset. This leads to a redistribution of the contact stresses. The movement of the wheelsets along the rails is characterized by a. Contact mechanics concerns the interaction of deformable bodies. In general terms, wheel rail contact mechanics is a wide field of study that ranges from overall vehicle dynamics and assessment of global contact forces, to micro mechanics of the surface materials in contact. A new approach to study the wheelrail contact problem in railway dynamics joao pombo, jorge ambrosio. The influence of wheelrail contact conditions on the. There is clearly a need for information about the wheel rail contact interface in term of position, area, and contact stresses.
An adhesion railway relies on adhesion traction to move the train. Modeling of energy processes in wheelrail contacts. Rail wheel contact problems have been analyzed by applying threedimensional finite element models. This issue is studied in papers a and b and will be further discussed in section 5 below.
Pdf wheelrail contact mechanics at full scale on the test. A new solution method for wheelrail rolling contact. The wheel rail contact is in between a onefourth scale aar1b locomotive wheel and a roller machined to us6 rail profile. Examples are a railway wheel and rail, or a pair of gear wheel teeth. Part one provides the fundamentals of contact mechanics, wear, fatigue and lubrication as well as stateoftheart research and emerging technologies related to the wheel rail interface and its management. In 1982, at the first contact mechanics and wear of wheel rail system greenwood 3 spotlighted the results of more than 20 years research on the contact of rough surfaces. Wheelrail contact models for vehicle system dynamics. Wu, a the formation of hollowworn wheels and their effect on wheelrail interaction,a pro ceedings, contact mechanics and wear of railwheel sys tem, the 6th international conference, gothenburg, sweden, june 2003. Analysis of wheelrail contact geometry in turnout section. The influence of these idealisations on contact solution has. Simulation and measurement of wheel on rail fatigue and wear.
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