Tribology of the wheel rail contact aspects of wear, particle emission and. 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. Vibration of the whole system is very noteworthy in terms of the servicelife of the components, driving safety and passenger comfort. 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. 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 interface handbook pdf free download epdf. The issue of the wheelrail interaction may be solved in two different waysusing either the model of a moving irregularity between a stationary wheel and rail, or the model of a moving wheel along the rail. Professor in charge of thesis on behalf of the advisory committee approved. It is scheduled on september 1 between the rail transit seminar held on august 31 and the. But among them, major categories consistently emerge.
Influences of the corrugation wavelength and depth on the wheelrail dynamic performance are investigated. Olofssoncrc press boca raton boston new york washington, dc. Prediction of rcf damage on underground metro lines. Aug 24, 2015 with unchecked rail, the only force available to increase direction change is reaction between the misaligned leading outer flange and the gaugecorner of the high rail, that additional stress perhaps becoming sufficient for the wheel to literally climb out of engagement with the gauge face of the outer rail and a derailment ensues. Wheel rail interaction call for papers trains magazine.
The rail profiles are measured as the car moves along the track. The term truck warp came into vogue in the late 1980s, when the new 125ton doublestack cars entered rail service, and a significant number of rail rollover derailments occurred. This is because the wheel and rail deform very little under load, unlike a rubber. Restricting the field to papers dealing with mutual wheel rail interaction measurements and discarding those dealing with instrumented wheelsets, all of them indicate that electric resistance strain gauges er attached to the rail are the most appropriate sensor to detect rail deformation from which loads may be. The paper is devoted to the experimental, theoretical analysis and computer simulation of influence of elastic properties of contact stiffness and wheelplate stiffness on the forces of vehicletrack interaction. This paper highlights the monitoring of wheel rail interaction over rail squat defects. Pdf dynamic analysis of wheel rail interaction using. Railmerge user guide overview railmerge is a din rail mounted product that merges two dmx inputs to one dmx output.
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. Ambala cantt ludhiana amritsar mainline electric multiple unit m emu. A timedomain model can be used to study nonlinear interaction between the wheel and rail. Webster defines warp as to turn or twist out of shape. 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.
Understanding the wheelrail interface part one the. The wheelrail interface is the contact area where wheelrail interaction between wheels and rails in railways takes place. In this paper, wheelflat and rail interaction dynamics is modeled through a finite element model. Staying on the rails with vehicletrack interaction volpe. However, shortwave irregularities can easily initiate and develop in rail weld due to the limitation of welding technology and thus rail weld has been a main highfrequency excitation and is responsible for deterioration of track components. Read chapter appendix a effect of wheelrail profiles and wheelrail interaction on system performance and maintenance in transit operations. Principles course wheel rail interaction conference. 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. Wheel flanges taper outwards from the tip, meaning that on railways, interaction occurs only after severe wear or if something else is seriously amiss. Wheel rail interaction fundamentals kevin oldknow, ph. 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 dynamic analysis of wheelrail interaction using finite. Development of an onboard measurement system for railway. Exemplary simulation of freight car interaction with track which posses one corrugated. Wheelrail interaction due to the polygonal wheel article pdf available in upb scientific bulletin, series d. No such compromise can be reached without sustaining a sensible dialogue across the wheelrail interface.
A fresh wheelflat has the shape of a geometric chord on the wheel circumference. Request pdf wheelrail interface handbook many of the engineering problems of. 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. Welding of these rails is briefly described together with their joining to rail switches and crossings made from austenitic steel. Foster rail technologies with the assistance of and permission from sahha 2015 technical workshop, birchwood hotel 8. The hertzian model for the most part is sufficient, say within 20% in the calculation of internal stresses and even better with respect to forces and damage. Three types of wheels are considered with different contact stiffness and wheel plate design. Wheel flange wear inspections can be done visually, or by manual. Mechanical engineering 733 january 2011 with 238 reads how we measure reads. Newton and clark 5 calculated the wheel rail interaction forces caused by wheel flats using a timedomain model in which the linear wheel vehicle and track models interact through a nonlinear contact stiffness. Loading vehicle is used to measure the dynamic rail profiles. Rail interaction fundamentals for railway professionals. Maintenance of the wheelrail interface sciencedirect. Numerical tribology of the wheelrail contact tel archives ouvertes.
These models include the whole life rail model wlrm, previously developed for great britain gb main line tracks, and shakedown theory. Grinders used on mixedtraffic railway systems typically have at least 32 grinding modules, e. Parametric study on the distribution of longitudinal load in. Staying on the rails with vehicletrack interaction. The phd researcher ali jamshidi, from the section of railway engineering, attended the conference entitled smart wheelrail interaction held in klosterneuburg, austria, 25th of march 2017. As a main part of continuously welded rail track, rail weld widely exists in highspeed railway. When damage is contained by a better design of the wheelrail interface, maintenance can be better planned and can become preventive, thereby extending the life of the components of both vehicle and track. At first, the wheel and the rail with sparse meshes. Static stress in the wheel treads maximum train speed braking requirements track conditions design and condition of equipment bibliography wheel steel handbook by rail safety and standards board the journal of rail wheel interaction klw wheelco. Analysis of wheelrail interaction using fe software. By combining experts within welding swerea kimab, nanotoxicology.
Kevin oldknow chief engineer, wheel rail interface l. Wheelrail interaction analysis tanel telliskivi tritammk 2003. Wheelrail wear and surface cracks request pdf researchgate. 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. Wheel rail interface rail adhesion from wikipedia, the free encyclopedia. Saving from elimination of extra 30day cycle of manual wheel. Wheelrail nonlinear interaction with coupling between. This is exactly what happens to a rail truck, or bogie, when it warps. Kevin oldknow chief engineer, wheelrail interface l. Dynamic response of wheelrail interaction at rail weld in.
Wheelrail interface handbook is a onestop reference for railway engineering practitioners and academic researchers. The following five factors have an important influence on the wheel life. Pdf wheelrail interaction due to the polygonal wheel. Foster rail technologies with the assistance of and permission from sahha 2015 technical workshop, birchwood hotel 8 october, 2015. Wheelrail interface handbook is a onestop reference for railway engineering. Wheelrail interface handbook request pdf researchgate. Wheel rail interface handbook is a onestop reference for railway engineering practitioners and academic researchers. The problem of the interaction between the wheel and the rail, taking into account an increase in loads and velocities, is becoming incredibly important. Rail merge user guide overview rail merge is a din rail mounted product that merges two dmx inputs to one dmx output.
The distribution of forces occurring in the interaction between the wheel and the rail has an influence on the dynamics of a vehicle and a. International journal of vehicle mechanics and mobility, 52. 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. Three types of wheels are considered with different contact stiffness and wheelplate design. The importance of wheelrail interface on energy savings. Flange climb derailment criteria and wheelrail profile. Forces from the wheels with flats can be up to four times higher than those from normal wheels. The wheel flange and rail contact was deemed to have little effect on track longitudinal response, thus the wheel flange was neglected in the fe model.
Using the axle box acceleration data obtained from the. Influence of rail, wheel and track geometries on wheel and rail. 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. On new effects of wheelrail interaction springerlink. The model of the moving irregularity is much easier to use and it is currently utilized for the frequencydomain analysis 5. Wheelrail interaction fundamentals kevin oldknow, ph. Aug 24, 2015 wheel flanges taper outwards from the tip, meaning that on railways, interaction occurs only after severe wear or if something else is seriously amiss. Causes of rail cant and controlling cant through wheel. Wayside measurement of lateral and vertical wheelrail forces. In the expressions 1 7, is the local deformation of wheel and rail materials, k the coefficient depending on the geometry of contact bodies and elastic properties of their materials, e 1 the elasticity modulus of the area of wheelrail interaction, w the displacement of the lower edge of the rail, 5. Vibration of the whole system is very noteworthy in terms of the servicelife of the components, driving safety and. Management on energy savings and sustainability railroad wheels and rails are made of high strength steel.
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. On some aspects of the wheelrail interaction sciencedirect. Interface journal the journal of wheelrail interaction. Jun 29, 2012 the paper is devoted to the experimental, theoretical analysis and computer simulation of influence of elastic properties of contact stiffness and wheel plate stiffness on the forces of vehicletrack interaction. The outside slip appears on the surface of contact zone and inside slip in the wheel and rail deformed layer of material. A steel wheel requires very little energy to roll on a steel rail. Provide background information and important concepts relating to wheel. Fundamentals of wheelrail interaction michael roney consultant and retired chief engineer, canadian pacific dr. A curve was selected based on its geometry and history of rail cant. The wheel and rail materials properties in real circumstances may significantly differ from these for clean state in the laboratory.
Influences of the corrugation wavelength and depth on the wheel rail dynamic performance are investigated. As a consequence, new joining methods for rails were investi gated. Part 1 3 the wheel rail interface anatomy and key terminology the contact patch and contact pressures creepageand traction forces. Integrated wheelrail characterization through advanced. Modelling of the dynamic contact between a wheel of a. Mar 25, 2017 the phd researcher ali jamshidi, from the section of railway engineering, attended the conference entitled smart wheelrail interaction held in klosterneuburg, austria, 25th of march 2017. Wheelrail interaction archives page 2 of 4 interface journal. This work reports a 3d finite element model of wheel. A controllable transverse profile is ground using stones that rotate about an axis normal to the rail, each of which produces a facet at a specified angle figs 20. Restricting the field to papers dealing with mutual wheelrail interaction measurements and discarding those dealing with instrumented wheelsets, all of them indicate that electric resistance strain gauges er attached to the rail are the most appropriate sensor to detect rail deformation from which loads may be. P x z v f n f n r s w l s kp cp m sl kb b ks cs m w m w kw cw ei, kga, m figure 3. Designed for both rail transit and heavy haul seminar attendees, the principles of wheelrail interaction course is an intensive, fullday course providing indepth examination of the primary aspects of wheel rail and vehicletrack interaction.
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. Many of these derailments and those resulting from equipment failures are attributable to the contact forces that. 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. The mechanical properties of the wheel and rail were chosen according to standards. 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. The specific matching of the profiles, and even small rotations of the rail, can have a large influence on the wheelrail interaction. Grinders with as few as four modules can be used for special purpose work, such as grinding of switch and. It is configured via an 8way dip switch that enables operation in remote or standalone mode, and numerous userselectable options. Track and infrastructure failure is the second leading cause of train derailments in the united states.
Metallurgy, wheelrail profile design and maintenance. Properly laid girder rail gauge and check faces wear simultaneously from the outset, with checks on curves being sufficiently robust to accept wear, a fact that anyone can verify by examining. If you need to print pages from this book, we recommend downloading it as a pdf. In this paper, wheel flat and rail interaction dynamics is modeled through a finite element model. The influence of key factors such as curve radius, different friction conditions, track irregularities and wheel rail profiles on the. Reducing rail side wear on heavyhaul railway curves based. Parametric study on the distribution of longitudinal load. Wayside measurement of lateral and vertical wheelrail. Trains is the presenting sponsor of wheel rail interaction. Understanding the wheelrail interface part two the. To investigate the relationship between wheel rail forces and rail cant, ns collaborated with ttci to set up a rail cant test site at wills, wv, on nss heavytonnage coal route between bluefield, wv and roanoke, va. By bob tuzik for three years running, new york city transit and the federal transit administration have kicked off the annual wheel rail interaction rail transit conference with discussion of the nyctfta research project to explore integrated wheel rail analytics on mtanycts no.
Pdf dynamic analysis of wheelrail interaction using. The dynamic interaction of wheel and rail is a key problem in a railway system. Dynamic simulation of tramtrain vehicles on railway track. The conference included a variety of topics related to wheelrail interaction and most of the speeches were focused on smart infrastructure monitoring. The linearization of wheelrail contact described by mauer 18 can be simplified for small contact angles see fig. Fundamentals of wheel rail interaction michael roney consultant and retired chief engineer, canadian pacific dr. Vehicle steering and curving forces the wheel set 30.
Railtrack irregularities can be considered as one of the most important sources of loads, generated by a moving train. In the darts model, the loads were introduced via hertzian springs traversing a sineshaped railtrack surface, as shown in fig. A study on the wheel rail interaction at switch points to reduce derailments in turnouts by samet ozturk approved. Wheelrail dynamic interaction due to excitation of rail. Q 12 vertical force of the rail and the left wheel of the 1st axle z.
1113 1400 234 44 918 1345 1272 803 64 1042 985 171 384 675 466 423 302 535 916 727 560 15 749 84 1530 702 1249 1 685 1071 550 891 1236 1164 485 1359 1449 459 393 328 5 106 719 740 365