Rail Surface Measurement And Multi-Scale Modeling Of Wheel-Rail Contact

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dc.contributor.authorAlemi, Mohammad Mehdien
dc.contributor.authorTaheri, Saieden
dc.contributor.authorAhmadian, Mehdien
dc.contributor.departmentMechanical Engineeringen
dc.coverage.spatialColumbia, SCen
dc.date.accessioned2017-02-27T17:19:57Zen
dc.date.available2017-02-27T17:19:57Zen
dc.date.issued2016-01-01en
dc.description.abstractIn railroad industries, one of the most important concepts is the ability to model and estimate the friction between the rail and the wheels. Overall, creating a general friction model is a challenging task because friction is influenced by different factors such as surface metrology, properties of materials in contact, surface contamination, flash temperature, normal load, sliding velocity, surface deformation, inter-surface adhesion, etc. Moreover, increase in the number of interfering factors in the process would add to the complexity of the friction model. Therefore, reliable prediction of the friction both theoretically and empirically is sensitive to how the model parameters are measured. Due to both safety and energy concerns, any attempts towards a better understanding of wheel/rail contact are considered important for the railroad industry. In this study, surface characteristics of four rail surfaces were measured at 20 microns over a rectangular area using a portable Nanovea Jr25 optical surface profilometer and the results were studied using various statistical procedures and Fractal theory. Furthermore, a 2D rectangular area was measured in this study because 1D height profile doesn’t capture all the necessary statistical properties of the surface. For surface roughness characterization, the 3D parameters such as root-mean-square (RMS) height, skewness, kurtosis and other important parameters were obtained according to ISO 25178 standard. To verify the statistical results and fractal analysis, a British Pendulum Skid Resistance Tester was used to measure the average sliding coefficients of friction based on several experiments over a 5 cm contact length for all four rail sections. The results supported this fact that the rail surface with lower fractal dimension number has the lower friction. In effect, the larger fractal dimension number simply would add more microtexture features to the contact surface which potentially increases the friction. This paper will discuss the results and the next steps towards a better understanding of the friction potential between the wheels and the track.en
dc.description.versionPublished versionen
dc.format.extent8 pagesen
dc.identifier.isbn978-0-7918-4967-5en
dc.identifier.orcidTaheri, S [0000-0001-7514-1690]en
dc.identifier.urihttp://hdl.handle.net/10919/75182en
dc.publisherASMEen
dc.relation.ispartofASME 2016 Joint Rail Conferenceen
dc.relation.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000380172900090&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=930d57c9ac61a043676db62af60056c1en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectTechnologyen
dc.subjectEngineering, Mechanicalen
dc.subjectTransportation Engineeringen
dc.subjectTransportationen
dc.subjectROUGH SURFACESen
dc.subjectFRICTIONen
dc.subjectMECHANICSen
dc.titleRail Surface Measurement And Multi-Scale Modeling Of Wheel-Rail Contacten
dc.title.serialProceedings of The ASME Joint Rail Conference, 2016en
dc.typeConference proceedingen
dc.type.otherProceedings Paperen
dc.type.otherMeetingen
dc.type.otherBooken
pubs.finish-date2016-04-15en
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Engineeringen
pubs.organisational-group/Virginia Tech/Engineering/COE T&R Facultyen
pubs.organisational-group/Virginia Tech/Engineering/Mechanical Engineeringen
pubs.start-date2016-04-12en

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