The data analysis software computes the contact parameters by placing each wheelset on the measured rail pair. Yes, the kuju and then rsdl rail simulator developers manuals, many railworks users still have copies of they could let you have. Appropriate models of the wear phenomena and their interaction with vehicle dynamics are therefore needed in order to optimise wheelset resistance to wear and to minimise total life cycle costs. A train wheel or rail wheel is a type of wheel specially designed for use on railway tracks. Wheelrail nonlinear interaction with coupling between. Development of a vehicletrack interaction model to predict the. Recent developments in rail transportation services. Rail grinding and its impact on the wear of wheels. Foster rail technologies with the assistance of and permission from sahha 2015 technical workshop, birchwood hotel 8 october, 2015. The further development that has been introduced in this paper is the adding of a new module, which integrates the buffers contact in the multibody code. Thus, the passage of a complete wagon 4 axles, 8 wheels is applied to the fe model. Fundamentals of wheel rail interaction michael roney consultant and retired chief engineer, canadian pacific dr. Pdf the dynamic interaction of wheel and rail is a key problem in a railway system.
The minimum freecurve radius is the point at which railway and tramway dynamics become separate technologies. Causes of rail cant and controlling cant through wheelrail interface management brad kerchof norfolk southern railway, roanoke, va dr. A lot of the complexity of the wheelrail contact is brought about by the open nature of the system and the constantly varying environmental conditions in terms of, for instance, temperature, humidity and natural contaminants. A steel wheel requires very little energy to roll on a steel rail. Wheel rail interface handbook is a onestop reference for railway engineering practitioners and academic researchers. Olofsson, contact mechanics analysis of measured wheelrail profiles using the finite element method journal of rail and rapid transit, proc. The importance of wheelrail interface management on energy savings and sustainability railroad wheels and rails are made of high strength steel. A fast timedomain model for wheelrail interaction demonstrated for the case of impact forces caused by wheel ats a. Monitoring of railwheel interaction using acoustic emission. Friction, friction management, lubrication, vehicletrack interaction, wheel rail interaction. Influences of the corrugation wavelength and depth on the wheelrail dynamic performance are investigated. But rail transit systems, which operate under the microscope of the urban environment, face special, often unique, challenges.
Kevin oldknow chief engineer, wheelrail interface l. The train dynamics of wheel rail contact and longitudinal. Foster rail technologies with the assistance of and permission from sahha 2015 technical workshop, birchwood hotel 8. 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. Wheel rail source qualification and considerations for rail. Aug 24, 2015 to prevent derailment it is then necessary to install an additional rail, a check rail, alongside the low rail to transmit a percentage of lateral thrust via the low wheel flangeback. The state, through the department of transportations rail division is responsible for freight and passenger rail. Turnout, profile wear, wheelrail contact, dynamic interaction, finite element method, contact stresses. Over 10 million scientific documents at your fingertips.
For rail stress and relative displacement calculations a fixed embankment spring can be conservatively used for total displacement checks or for calculating railstructure interaction forces forces imposed on the bridge by a continuously welded rail compare fixed condition and a lower bound embankment stiffness. Appendix a effect of wheelrail profiles and wheelrail interaction on system performance and maintenance in transit operations unfortunately, this book cant be printed from the openbook. Pdf presented at wheels on rails an update, seminar of the institution of mechanical engineers, london, april 2002. This work reports a 3d finite element model of wheelrail rolling contact which can simulate dynamic wheelrail interaction at arbitrary contact geometry up to 400 kmh. This document includes an executive summary of that debate and the documents from the meeting. This paper describes a continuous method for measuring the derailment coefficient and the forces between the wheel and rail. The rail steel can be assumed to have a shear yield strength of k70 ksi. This web site is for you if you are interested in railway simulations. Causes of rail cant and controlling cant through wheelrail. Wheelrail dynamic interaction due to excitation of rail. A survey of wheel rail friction office of research, development and technology washington, dc 20590 dotfraord1721. Consideration of nonlinear wheelrail contact forces for. The importance of wheelrail interface on energy savings.
Sep 30, 2014 characteristics of wheel rail dynamic interaction due to the rail corrugation in a highspeed railway are analyzed based on the theory of vehicletrack coupled dynamics in this paper. Dynamic response of wheelrail interaction at rail weld in. Urban light rail systems and subways are expanding in many. Imperfections in the wheelrail contact are one of the main sources of. Huimin wu transportation test center, inc, pueblo, co number of words. But what should the maintenance limit be for this height difference. Noise characterization from the most dominant sources. This work presents the results of field measurements and laboratory studies carried out with a view to developing ways to monitor rail wheel interaction using acoustic emission. In this paper, wheelflat and rail interaction dynamics is modeled through a finite element model. Integrating dynamics and wear modelling to predict railway. Jul 15, 2009 oscillatory wheel load fluctuation of considerable amplitude is always observed in railway cars traveling at high speed.
Only by knowing the rules of wheel rail dynamic interaction deeply, can it be likely to minimize the wheel rail dynamic interaction and achieve optimum design of dynamic performance matching between the vehicle and track. Progress on wheelrail dynamic performance of railway curve. 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 anatomy and key terminology. The contact area at each wheel tread low rail interface is approximately circular, with a typical radius of 7mm. Wheel rail interaction call for papers trains magazine. Use features like bookmarks, note taking and highlighting while reading wheelrail interface handbook. The wheel rail interface and key terminology the contact patch and contact pressures creepage, friction and traction forces wheelsetgeometry and effective conicity vehicle steering and curving forces rail and wheel wear. In this paper, wheel flat and rail interaction dynamics is modeled through a finite element model. Trains is the presenting sponsor of wheel rail interaction. This model is employed to investigate dynamic response of wheelrail interaction at theoretical and measured rail weld, including wheelrail force and axlebox acceleration. Wheel rail interaction conference wri 16 rail professional. Rail wheel interface systems focus on understanding the dynamic interaction between the rail wheel and the rail while the vehicle is in motion. The paper herein presents an analysis of the interaction between two wheels and a rail ballasted track due to the smallscale undulation of the rail rolling surface.
This work reports a 3d finite element model of wheel rail rolling contact which can simulate dynamic wheel rail interaction at arbitrary contact geometry up to 400 kmh. This paper discusses the stress history at the wheelrail contact derived from. Download it once and read it on your kindle device, pc, phones or tablets. The conference focuses on the complex and critical interaction between the wheel and the rail vehicletrack. The 24th annual wheel rail interaction conference will be held april 30 to may 3, 2018, at the crowne plaza chicago ohare hotel, in rosemont, ill. The wheel rail interaction conference is designed to inform and educate professionals who work for railroads, transit agencies, contractors, and consulting firms. Pdf dynamic analysis of wheelrail interaction using finite. Timedomain models, incorporating the nonlinearities in the contact zone, have been used by, for example, clark et al 5 and. Modelling of the dynamic contact between a wheel of a. Appendix a effect of wheelrail profiles and wheelrail. For rail stress and relative displacement calculations a fixed embankment spring can be conservatively used for total displacement checks or for calculating railstructure interaction forces forces imposed on the bridge by a continuously welded rail compare fixed condition and. The wheelrail interface is the contact area where wheelrail interaction between wheels and. The wheelrail interface is the contact area where wheelrail interaction between wheels and rails in railways takes place. Managing wheelrail performance on amtraks northeast.
Two similar phenomena occur during acceleration in locomotives wheels and braking in all vehicles wheels, called slippage and skidding. Causes of rail cant and controlling cant through wheel. Wheelrail interface handbook is a onestop reference for railway engineering practitioners and academic researchers. This can be used as a drop in replacement for a 3d printers x or y axis. Wheelrail interaction archives page 3 of 4 interface.
Jan 04, 2014 but rail transit systems, which operate under the microscope of the urban environment, face special, often unique, challenges. This paper deals with the problem of identification of the parameters of adhesion suitable for describing wheel rail interaction in trains, during braking. Passby event will be split into several modeling steps, where necessary simplification. Kevin oldknow chief engineer, wheel rail interface l. Pdf monitoring of railwheel interaction using acoustic. Rail vehicle qualiication test compendium february 2015 fta report no. Interaction of treadhollow wheel and worn switch point. Use features like bookmarks, note taking and highlighting while reading wheel rail interface handbook. Its rail system is designed to connect together to form any needed length. Tramway wheel profiles in poland are quite old, the newest dates.
Rail grinding and its impact on the wear of wheels and. Wheelrail interaction due to the polygonal wheel 97 in terms of the relative displacements between the rail crosssection and the rail pad, the model of the rail pad has three kelvinvoigt systems with the elastic constants kx, kr and k. A fresh wheel flat has the shape of a geometric chord on the wheel circumference. A tool and a method for fe analysis of wheel and rail interaction tanel telliskivi, ulf olofsson, ulf sellgren and patrik kruse machine elements, department of machine design. If you need to print pages from this book, we recommend downloading it as a pdf. In this linear model, the vertical contact force was assumed to depend linearly on the deflection and no loss of contact was allowed between the wheel and rail. The third method considers nonlinear wheelrail contact forces in. Pdf analysis of wheelrail interaction for the development of a new. The frequency range of interest for rolling noise is generally 50 to 5000 hz. By bob tuzik for three years running, new york city transit and the federal transit administration have kicked off the annual wheelrail interaction rail transit conference with discussion of the nyctfta research project to explore integrated wheelrail analytics on mtanycts no. The interaction of the rail and wheel and the resulting phenomena. Improving the sustainability of transport the rail sector.
Railworks manuals available for download now if this is your first visit, welcome to trainsim. Wheelrail interaction analysis tanel telliskivi tritammk 2003. A wheel a leaf body which is constrained on a rail inertial body the bas2000 cannot be modeled as a bogie but as a mechanism with wheels. Wheel rail source qualification and considerations for rail pbn robert fiedler esi group this paper will discuss directions for train passbynoise simulation and challenges associated with diffraction modeling around large structures.
The problem of the interaction between the wheel and the rail, taking into account an increase in loads and velocities, is becoming incredibly important. Interface journal the journal of wheelrail interaction. Monitoring of railwheel interaction using acoustic emission nirav ashokkumar thakkar submitted for the degree of doctor of philosophy on completion of research in the school of engineering and physical sciences, mechanical engineering, heriotwatt university june 2009. Speakers at rail transit 07, advanced rail management and interface journals third seminar devoted to wheelrail interaction on rail. The next two methods studied establish the interaction between the train and the bridge by consideration of the relative lateral displacements between the rail and the wheel in the dynamic equations.
Influences of the corrugation wavelength and depth on the wheel rail dynamic performance are investigated. This work presents the results of field measurements and laboratory studies carried out with a view to developing ways to monitor railwheel interaction using acoustic emission. The susceptibility of railway wheels to wear and rolling contact fatigue damage is. Mathematical modelling of wheelrail contact in order to investigate wear effects at wheelrail. The work presented in this thesis is related to the condition monitoring of railwheel interaction using acoustic emission ae, the principle being that both normal and abnormal rolling give rise to ae, features of which are related to the mechanical intensity. Improving the sustainability of transport the rail sector as. The acceleration measured on the axle box indicates that the frequency of this fluctuation can be as high as 70 hz. Wheels on rails an update, understanding and managing the wheelrail interface.
The third method considers nonlinear wheelrail contact forces in the interaction as well as realistic wheel and rail profiles. The detailed modelling of rail track dynamic and wheel rail interaction was studied in 1992 while dtrack program for dynamic simulation also have been created by cai for his phds thesis of queens university in canada 30. Wheel rail source qualification and considerations for rail pbn robert fiedler. This interaction is a specialist subject covering the design and management of the very high stresses in the small contact area between a steel wheel and steel rail. Fundamentals of wheelrail interaction michael roney consultant and retired chief engineer, canadian pacific dr. Afterward, iwnick has done a benchmark, which was called manchester benchmarks in 1998 31. According to most standard plans, it is one quarterinch. Archived from the original pdf on february 1, 2014. Wheel rail interface handbook kindle edition by lewis, r. Wheel rail source qualification and considerations for. The influence of wheelrail contact conditions on the. A fresh wheelflat has the shape of a geometric chord on the wheel circumference. Abnormal wheel motion patterns can be caused because of poor rail profile or poor track geometry leading to damage to both wheels as well as the rails. Characteristics of wheelrail dynamic interaction due to the rail corrugation in a highspeed railway are analyzed based on the theory of vehicletrack coupled dynamics in this paper.
Maryclara jones and nicholas wilson transportation technology center, inc. Noise characterization from the most dominant sources, such as wheelrail interaction will be shown, including validation case of dynamic behavior of real rail track scenario. Pdf vehicle dynamics and the wheelrail interface researchgate. A study on the wheelrail interaction at switch points to reduce derailments in turnouts by samet ozturk a thesis submitted to the faculty of the university of delaware in partial fulfillment of the requirements for the degree of master of civil engineering spring 2014. Wheelrail interaction archives page 3 of 4 interface journal. It contains an introduction and the following papers. This is the 5th version of my printable linear rail, ive gotten everything to finally work correctly. Forces from the wheels with flats can be up to four times higher than those from normal wheels. Monobloc wheels do not have encircling tires, while resilient rail wheels have. Wheel rail profiles and vehicle steering behavior are such that the curve can be considered mild the contact area at each wheel tread low rail interface is approximately circular, with a typical radius of 7mm. Recent developments in rail transportation services 20 the oecd competition committee discussed the recent developments in rail transportation services in june 20. Rayner senior architect, labview champion data science automation, inc. This model is employed to investigate dynamic response of wheel rail interaction at theoretical and measured rail weld, including wheel rail force and axlebox acceleration. Starting with the general worn shape of the amfleet and acela wheels, nrcc.
Rail wheel interaction indian railways institute of. Progress on wheelrail dynamic performance of railway. Only by knowing the rules of wheelrail dynamic interaction deeply, can it be likely to minimize the wheelrail dynamic interaction and achieve optimum design of dynamic performance matching between the vehicle and track. Continuous measurement of interaction forces between wheel. A theoretical and experimental research must be carried out on the basis of vehicletrack coupled system.
Interaction of treadhollow wheel and worn switch point stock rail 1. Oscillatory wheel load fluctuation of considerable amplitude is always observed in railway cars traveling at high speed. Vehicle dynamics and the wheelrail interface by jerry evans, aea technology rail simon iwnicki, manchester metropolitan university mmu from. Wheelrail interface handbook kindle edition by lewis, r. This machine hopefully will be my entry for the gada prize.