computer modeling
TRANSCRIPT
COMPUTER MODELING
Examples of Modeling Capabilities and Benefits for Rail Vehicles• Optimizenewwheelandrail profiledesigns• Predicttheeffectsofwheel/rail profiledesignonwearratesand rollingresistance• Investigateandmitigatemechanisms thatcauserollingcontactfatigueand railcorrugations• Evaluatenewtruckdesigns• Improvecarsuspensions• Optimizetrainoperationsforminimum energyconsumption• Evaluatenewturnoutdesigns• Investigatederailments• Calculationofin-trainforces(buff/draft)• Predicttheeffectsoflubricationontrain rollingresistanceandwheel/railforces• Acceleratetheresearchanddevelopment ofnewproducts
Transportation Technology Center, Inc. (TTCI) can accurately model the behavior of• Railvehicles• Track• Components• Wheel/Rail
Why Model?• Findsolutionstodifficulttechnical questions• Helpinthedevelopmentstage ► Vehicles ► Suspensionsystems ► Trackstructures ► Brakesystems• Reducethecostoffieldtesting
TTCI meets the needs of railroad industry by regularly• Developing• Upgrading• Andimprovingthemodels
Modeling ToolsNUCARS®
• Capabilities ► Evaluationofdynamicinteraction betweenrailwayvehiclesandtrack• Simulationofanytypeofrailwayvehicle ► Locomotives ► FreightVehicles ► Passengerandtransitvehicles (multipleandarticulatedcars) ► Simulationonanytrackgeometry includingturnouts,crossings,and trackswithguardrails ► Accuratecalculationofnon-linear wheel/railinteractionforces ► Simulationwithnon-lineareffects ► Springsanddampers ► Airsuspensions ► Stick-slipfriction ► Traction ► Braking• Includesasuiteofpreandpost processingprogramsfor ► Preparingvehicleandtrackinputs ► Analyzingsimulationresults• ProjectsutilizingNUCARS®include ► Developing,evaluating,and optimizingnewvehicledesigns ► Investigatingandimproving ridequality ► Optimizingwheelandrailprofile design ► Evaluatingwheel-railinteraction forcesinturnout,crossing,andother trackcomponents
Railway Track Life Model (RTLMTM)• Programusedfor ► Trackandtrackcomponent degradationanalysis ► Maintenanceplanning ► Life-cyclecostanalyses• Softwarepackageincludesmodels topredict ► Railwearrate ► Raildefectrate
► Woodtiedegradation ► Turnoutlife ► Ballastdegradationrates ► Trackroughnessgrowth
Wheel/Rail Tolerance (WRTOLTM) Software• Assesswheel/railcontactparameters tomakepredictionfor ► Vehicleperformance ► Wheel/railwear ► WearIndex• Comprehensiveviewofwheel/rail contactatsystemlevel• Distinctfeatureisitsabilitytoanalyze thecontactgeometriesofmany ► Wheelsetsagainstameasuredpairof rails(RailFunctioninWRTOLTM) ► Manyrailsagainstameasuredpairof wheels(WheelFunctioninWRTOLTM)
Simulation of Train Action to Reduce Cost of Operations (STARCOTM)• Predictandanalyzetheresponsefrom variouspowerandbrakecommands• Maybeusedtoevaluatethevehicle’s responsetoin-trainforces• Essentialmodelforderailment preventionandanalysiswork• Interactiveprogramthatislicensed torailways• Enablestheusertosimulatetrackprofiles androllingstockspecifictotheirrailway• Simulationsintegratevalidateddetailsof trainairbrakemodels ► Nonlinearmodelsofinter-car couplingcharacteristics ► Locomotivetraction/braking characteristics ► Trainresistancecalculations• Modelsdesignedforanalysisof freighttrainsandassociated longitudinalaction• Predictbrakingsystemresponseand stoppingdistances
55500 DOT Road | P.O. Box 11130Pueblo, CO 81001P/F: (719) 584-0750E: [email protected] | www.aar.com