The effect of dynamic rail roll on the wheel–rail

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1、VehicleSystemDynamicsVol.46,Supplement,2008,107117Theeffectofdynamicrailrollonthewheel–railcontactconditionsY.Bezina*,S.D.IwnickiaandM.CavallettibaManchesterMetropolitanUniversity,ChesterStreet,Manchester,UK;bVI-Grade,ViaG.Duranti1/A-4-06125,Perugia,Ital

2、y(Received4August2007;finalversionreceived21December2007)Simulationtoolsarenowwidelyusedtopredictthedynamicbehaviourofrailwayvehiclesandtheyhavebeendevelopedtoincludehighlycomplexvehiclemodelswhichcanrepresentnon-linearwheelrailcontactandsuspensioncharact

3、eristics.Lessemphasishassofarbeenplacedonthetrackmodelsusedinthesesimulationswhichhavetendedtobefairlysimplelinearrepresentationsofthetrackandsubgradealthoughthesecanalsocontainsignificantdiscretenon-linearities.Thispaperfirstreviewsthetrackmodelsusedincur

4、rentrailwayvehicledynamicsoftwareandidentifiestheirmainlimitations.Theparticularfocusoftheworkreportedhereistherailrolldegreeoffreedom(DOF)anditsinfluenceonthewheelrailcontactcondition.TherigidbodytrackmodelinthesoftwaretoolVI-RailpoweredbyMSCAdamsismodifie

5、dtofullytakeintoaccountrailrollincombinationwiththenon-linearon-linecontactalgorithm.Variousstaticanddynamictrackcasesaredesignedtotestthehypothesisthatrailrollmayaffectthecontactcondition.Resultsshowtheinfluenceofthedynamicrailrollonthelocationoftheconta

6、ctbetweenthewheelandrailandsomeanalysisismadeintotheimplicationsthismayhaveonwearandrollingcontactfatiguecalculationsamongotherapplications.Keywords:railroll;contactalgorithm;flexibletrack;wheelrailcontact;wear;RCF1.IntroductionResearchersanddeveloperscon

7、stantlystrivetoenhancethecontactalgorithmsusedinrail-wayvehicledynamicssoftwaretoolsinordertoincreasethelevelofdetailandaccuracyforpredictingthecontactconditionbetweenthewheelandtherail.Theseenhancementsbasedonruntimecontactroutines[1]extendthedomainofap

8、plicabilityofsimulationstotakeintoaccountextremeconditionssuchasderailmentswithlargeanglesofattackandofroll,flangeclimbing,varyingrailprofilesforswitchesandcrossingssimulation[2],rollingcontactfatigue(RCF)prediction[3,4],etc