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Vehicle/Tire/RoadDynamics

Vehicle/Tire/Road Dynamics

Elsevier

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Notices

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ISBN:978-0-323-90176-5

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3Tireandvehiclehandlingdynamics95

4Tireandvehicleridedynamics275

5TireandvehicleNVH359 5.1Structure-borneacoustics

6Dependencebetweenhandling,ride,andNVH459

6.1Fundamentaltirematerialproperties

6.2Stressanddeformationdistributionintirecontactpatch

6.3Conflictsbetweensafetyandcomfort

6.4Optimizationwithactivesuspensioncontrol

6.5Brakingandcorneringnoise

7Roadeffectonhandling,ride,andNVH539

7.1Surfacetexturecharacterization

7.2Influenceofsurfacetextureontiregrip

7.3Influenceoftheroadprofileonvehiclecomfort

7.4InfluenceofpavementparametersonNVH

8Intelligenttireandautonomouselectricvehicle589

8.1Vehicle/tirestateandparameterestimation

8.2Dynamicscontrolforelectricvehicles

8.3Smarttire

Appendix1:Examplespecificationsofdifferenttypesofvehicles617 Appendix2:Literaturereviewfortiremodalanalysis631 Index647

Introduction

1.1Background

Kinematicsisasubfieldofclassicalmechanicsthatdescribesthemotionofpoints, bodies(objects),andsystemsofbodies(groupsofobjects)withoutconsideringthe forcesthatcausethemtomove.Dynamicsisthebranchofclassicalmechanicsconcernedwiththestudyofforcesandtheireffectsonmotion.Obviously,thetopicinthis bookconsidersunderlyingforcesandcomputesmotionfrominitialconditionsand physics,sovehicledynamicsisthecorrectterm.

DynamicsisgovernedbyequationsofmotionorNewton’sSecondLawofMotion. Inthisbook,dynamicsisanalternativetermtomotion.Inphysics,motionisthephenomenoninwhichanobjectchangesitspositionovertime.Motionismathematically describedintermsofdisplacement,velocity,acceleration,andtime.Themotionofa bodyisobservedbyattachingaframeofreferencetoanobserverandmeasuringthe changeinpositionofthebodyrelativetothatframe.Inthisbook,motioniscategorized intomovementandvibration.Inphilosophy,everythingintheUniversemovesand vibrates.Movementisdefinedasacontinualchangeofphysicallocationrelativeto areferenceframe.Generally,theremovalofappliedexternalforceswillnotleadto thebodyreturningtoitsoriginallocation.Forvehiclehandlinganalysisfocusingon planar/horizontalmotion,thevehiclesystemisusuallytreatedasasinglebodyhaving onlyonemovementwithoutconsideringthewheelmovements.Vibrationisdefinedas theoscillationofamechanicalorstructuralsystemarounditspointofequilibrium.After theremovalofexternalexcitations,asystemwilleventuallyreturntoastateofequilibriumaslongasdampingexists.Forvehiclerideanalysisfocusingonverticalmotion, thevibrationsofbodyandwheelsusuallymodeledaslumpedmasses(rigidbodies)are bothconsidered.Modalanalysistechniquesaretypicallyappliedtolinearsystemsto studytheirmodalpropertiesasdescribedbysystemnaturalfrequency,modeshape, anddampingratio.Inthisbook,oscillationisanalternativetermtovibration.

NVHstandsfornoise,vibration,andharshness.Noiseisusuallyconsideredasan unwantedsound.However,“wanted”or“unwanted”dependsuponthelistenerandthe circumstances.Forexample,rockmusiccanbepleasurablesoundtoonepersonbutan annoyingnoisetoanother.Inthisbook,soundisanalternativetermtonoise.Vibration cangeneratenoisebysoundradiationandnoisecanalsocausevibrationbyfluidstructureinteraction.Harshnessisthesubjectiveimpressionsofthenoise.Inhandling andrideanalysis,thevehicleisconsideredasasinglebodyoranintegratedsystemof multiplebodiesconnectedelasticallywitheachother,thatis,eachbodyisonelumped masswheremotionsofitspartsareinphase.However,inNVHanalysis,thebodyhas tobedistributedmasswheremotionsofitspartsarenotinphase,allowingacoustic wavestopropagateinsidethestructureorradiateintotheair.Thesoundfieldand vibrationmapinthevehiclecabinarehighlynonuniform.Thesoundpressurelevel atdriver’searclosertothewindowcanbe3dBhigherthanthatattheotherear;the Vehicle/Tire/RoadDynamics. https://doi.org/10.1016/B978-0-323-90176-5.00003-6

Copyright © 2023ElsevierInc.Allrightsreserved.

soundpressurelevelattherearseatcanalsobe3dBhigherthanatthefrontseat.The vibrationlevelscanalsobedifferentonthefloor,seat,andsteeringwheel,whichis usuallynotinthescopeofridevibrationsfocusedonsmoothnessatthevehiclecenter ofgravity.ItisalsoimpliedthatNVHisahighlysubjectiveperformance,whichis whysoundqualitybecomesmoreandmoreimportantforvehicleproductquality. Similarly,handlingqualityandridequalityintermsofsubjectiveevaluationshave drawnhigherattentionrecently.

Insummary,thereisaspectrumofvehicleperformanceareas:handlingforlowfrequency(<10Hz),rideformiddlefrequency(10–100Hz),andNVHforhighfrequency (>100Hz).Conventionally,“vehicledynamics”onlyimpliedhandlingthatismostcriticalrelatingtosafety,lateritmergedwithridebecausecomfortbecameimportant,now NVHhasdrawnhigherattentionforproductquality.Allofthethreeareasareactually dynamics,butwearenotusedtocallingNVHdynamicsyet.Allthreeareascanbeanalyzedinfrequencyandtimedomain,thoughhandlingisusuallyanalyzedintime domainwhileNVHinfrequencydomain.Inthisbook,bothfrequencydomainanalysis andtimedomainanalysiswillbepresentedforallthreeareas.Asummarycomparison betweenvehiclehandling,ride,andNVHisshownin Table1.1.

Generally,therearefivemajornoisesourcesforavehiclewithinternalcombustion engine(ICE):powertrain,intakesystem,exhaustsystem,aerodynamicturbulence (wind),andtire-roadinteraction.Foranelectricvehicle(EV),thepowertrainnoisefrom electricmotorismuchlowerthanICE,andtheintake/exhaustnoiseisremoved.This bookmainlyfocusesontire-road-inducedNVH,whichisdominantforregularvehicle speeds.Traditionally,vehicleperformanceislimitedbytheICE,astheenginedeterminesthevehicletractioncapabilityandgeneratesmostoftheinteriornoiseunderregularconditions.However,electricmotorwithhightorqueandlownoisecaneliminate thosedisadvantagesofICE.Hence,theperformanceofEVswillbelargelydependent ontiresprovidingsufficientgripandminimizingroadnoise.Vehicleelectrificationcan alsoprovidemorespaciouspassengercompartmentduetocompactpowertrain/ drivetrainsystemandlowerheightofcenterofgravityduetothebatteryarrangement underthevehiclebody,whichimprovesridecomfortandrollstability.Theadvanced suspensiontechnologyalsoputstireinamoreimportantroleinimprovingvehiclecomfort.Therefore,tire,asacomponentofvehiclesystem,willbecriticalforthemajor vehicleperformancesincludinghandling,ride,andNVH.Thetirecontactpatchis theonlyinteractionbetweenavehicleandtheroad;theforcesgeneratedinthispatch dictatethemovementandvibrationofthevehicle.Fortheautonomousvehicle,dueto littleornocontrolofthevehicle,occupantsmayhavedifferentperspectivesregarding handling(lowerrequirementsforsteeringfeelbuthigherrequirementsforsafety/stability)andhigherstandardsforridecomfortandNVH.

1.2Literature

Acomprehensivesearchforpublishedbooksonvehiclehandling/ride/NVHhasbeen performed,aslistedin Table1.2.Thesearegoodreferencesforreaderstodelveinto specificareasofinterest.However,itcanbeseenthatthereisaneedtoputtogethera bookcoveringalltheareas. 2Vehicle/Tire/RoadDynamics

Table1.1 Comparisonsbetweenvehiclehandling,ride,andNVH. HandlingRideNVH

Vehicle model OnelumpedmassMultiple lumped/discrete masses(rigid body)

Multipledistributed/ continuousmasses (flexiblecomponent)

TiremodelSpringSpringorfinite element Finiteelement

Driver input Steeringwheel,throttle/ brake,gear MostlycruiseMostlycruise/coast

ExcitationTire-roadfrictionRoad irregularity impact

Tire-pavement roughness

Motion category MovementMovementand vibration Vibration

Vibration response NAFreeresponseForcedresponse

Typical analysis domain TimeTimeand frequency (below100Hz)

Time domain scope MaxperformanceImpactpeakand damping

Frequency domain scope StabilitycontrolModal oscillation

Roll/pitchangle, max,andrmsof accelerations

Frequency(above 100Hz)

Soundquality: fluctuation, roughness

Spectraldistribution andweighting

StateSteady-stateortransientMostlytransientMostlysteady-state Parameters ofinterest Maxvehiclelongitudinal/ lateralacceleration/ velocity,yawrate,sideslip angle

Soundpressure,rms ofaccelerations

ImplicationSafety,stability,reliabilityComfort,easePleasantness, quality,identity

1.3Organization

Tofilltheknowledgegapbetweendifferentareas, Chapter2 presentedthebasicdefinitionsandfundamentalsrelatedtovehiclehandling,ride,andNVH.

Inthegeneralizedvehicle/tiredynamics,thesteadystateortheshort-timetransient tireforcesdominatethevehiclehandlingbehavior(Chapter3);then,thefluctuationof thereactionforcesinfluencestheridequality(Chapter4);finally,thestabilizedoscillationofeachvehicle/tirecomponentrelatestoNVHperformance(Chapter5).However,therearenoclear-cutboundariesbetweenvehiclehandling,ride,andNVH.

Table1.2 Listofrelevantbooks(✓ denotesover20%; denotes5–20%;Xdenotesbelow5%).

Author/EditorYearPublisherTitle ScopeSystemDepthApplication

Handlingseries

Yongetal. [1] 1984Elsevier Science VehicleTraction Mechanics: Volume3

Gargand Dukkipati [2] 1984AcademicPress ofElsevier Dynamicsof RailwayVehicle Systems

Haug [3] 1989Allynand Bacon ComputerAided Kinematicsand Dynamicsof Mechanical Systems:Basic Methods

Gillespie [4] 1992SAE International Fundamentalsof VehicleDynamics

Millikenand Milliken [5] 1994SAE International RaceCarVehicle Dynamics

Genta [6] 1996World Scientific Publishing MotorVehicle Dynamics: Modelingand Simulation

Dixon [7] 1996SAE International Tires,Suspension andHandling(2nd Edition)

Wong [8] 2001JohnWiley& Sons TheoryofGround Vehicles(3rd Edition)

Howardetal. [9] 2004SAE International CarSuspension andHandling(4th Edition)

Dukkipatietal. [10] 2008SAE International RoadVehicle Dynamics

Unique feature HandlingRideNVHVehicleTireRoadTheoryPracticeExperimentSimulation

XVehicle-terrain energytransfer, FEM, trafficability

Railwayvehicle

Multibody applicationto vehicle

XXXSteering, rollover

XRacehandling metrics, aerodynamics

Vehiclemodel datasets

system

Trackedvehicle, terramechanics

Suspensions, durability

XTheoryof dynamics, accident

Jazar [11]

Wong [12]

2008SpringerVehicle Dynamics: Theoryand Application

2009ButterworthHeinemannof Elsevier Terramechanics andOff-Road Vehicle Engineering: TerrainBehavior, Off-RoadVehicle Performanceand Design(2nd Edition)

Poppand

Schiehlen [13]

Pacejka [14]

Rajamani [15]

2010SpringerGroundVehicle Dynamics

2012ButterworthHeinemannof Elsevier TireandVehicle Dynamics(3rd Edition)

2012SpringerVehicleDynamics andControl(2nd Edition)

Doumiatietal. [16]

Mastinuand Ploechl(Eds.) [17]

Blundelland Harty [18]

Vehicle kinematics

Abe [19]

2012JohnWiley& Sons VehicleDynamics EstimationUsing KalmanFiltering: Experimental Validation

2014CRCPressof Taylor& Francis RoadandOffRoadVehicle SystemDynamics Handbook

2015ButterworthHeinemannof Elsevier TheMultibody Systems Approachto VehicleDynamics (2ndEdition)

2015ButterworthHeinemannof Elsevier VehicleHandling Dynamics: Theoryand Application(2nd Edition)

Terrain behavior, computer-aided method

Autonomous control

Tirevariable estimation

manvehicle

Datasetforfull vehicle

Handling quality,rearwheelsteering Continued

Author/EditorYearPublisherTitle

Meywerk [20] 2015JohnWiley& Sons VehicleDynamics

Pauwelussen [21] 2015ButterworthHeinemannof Elsevier Essentialsof VehicleDynamics

Chenetal. [22] 2016JohnWiley& Sons IntegratedVehicle Dynamicsand Control

Taghavifarand Mardani [23] 2017SpringerOff-roadVehicle Dynamics: Analysis, Modelingand Optimization

Balkwill [24] 2017ButterworthHeinemannof Elsevier Performance Vehicle Dynamics: Engineeringand Applications

Guiggiani [25] 2018SpringerTheScienceof Vehicle Dynamics: Handling, Braking,andRide ofRoadandRace Cars(2ndEdition)

Maclaurin [26] 2018JohnWiley& Sons High-SpeedOffRoadVehicles: Suspensions, Tracks,Wheels andDynamics

Zhangetal. (Eds.) [27] 2018Woodhead Publishingof Elsevier Modeling, Dynamics,and Controlof Electrified Vehicles

Mechatronics

Statespace, vehicle-driver interface

ASS,AFS,ABS, EPS,VSC,4WS, DYC

energy,AI

Performance costfunctions, ADAMS

Racecar,MAP, VIP

Off-roadmagic formula

EVcomponents andcontrol

Schrammetal. [28]

Minaker [29]

2018SpringerVehicle Dynamics: Modelingand Simulation(2nd Edition)

2019JohnWiley& Sons Fundamentalsof VehicleDynamics andModeling:A Textbookfor EngineersWith Illustrationsand Examples

RillandCastro [30]

Complete multibody vehiclemodel

Multibody dynamics

Vangi [31]

2020CRCPressof Taylor& Francis RoadVehicle Dynamics: Fundamentalsand Modelingwith MATLAB® (2nd Edition)

2020ButterworthHeinemannof Elsevier VehicleCollision Dynamics: Analysisand Reconstruction

Azadietal. [32]

2021ElsevierVehicleDynamics andControl: Advanced Methodologies

Fleetand articulated vehiclecontrol Rideseries

Henryand Wambold(Eds.) [33]

Guglielmino etal. [34]

1992ASTMVehicle,Tire, Pavement Interface

2008SpringerSemi-active Suspension Control: ImprovedVehicle RideandRoad Friendliness

roughness

Suspension control Continued

Author/EditorYearPublisherTitle

Yangetal. [35] 2015SpringerDynamicsof Vehicle–Road CoupledSystem

GentaandGenta [36] 2016World Scientific Publishing RoadVehicle Dynamics: Fundamentalsof Modelingand Simulation

Inman [37] 2017JohnWileyand Sons Vibrationwith Control(2nd Edition)

NVHSeries

Ewins [38] 1984Research StudiesPress ModalTesting: Theoryand Practice

Kinsleretal. [39] 2000JohnWileyand Sons Fundamentalsof Acoustics(4th Edition)

Sandbergand Ejsmont [40]

2002INFORMEXTyre/RoadNoise ReferenceBook

Roaddynamics

Rigidvehiclevs. elastic suspensions

Modalcontrol

XModalanalysis

XClassicbookon TRN Harrison [41] 2004ButterworthHeinemannof Elsevier Vehicle Refinement: ControllingNoise andVibrationin RoadVehicles

Fahyand Gardonio [42]

2007AcademicPress ofElsevier Soundand Structural Vibration: Radiation, Transmissionand Response

XInteriorand exteriornoise assessmentand control

Fastland Zwicker [43]

Crocker(Ed.) [44]

2007SpringerPsychoacoustics: FactsandModels (3rdEdition)

2008JohnWiley& Sons Handbookof Noiseand VibrationControl

Thompson [45] 2009Elsevier Science RailwayNoise andVibration: Mechanisms, Modelingand MeansofControl

Wang(Ed.) [46]

2010Woodhead Publishingof Elsevier VehicleNoiseand Vibration Refinement

Sheng [47] 2012SAE International VehicleNoise, Vibration,and SoundQuality

KraftandWhite (Eds.) [48]

2013Woodhead Publishingof Elsevier Memsfor Automotiveand Aerospace Applications

Inman [49] 2014PearsonEngineering Vibration(4th Edition)

Fuchsetal. (Eds.) [50]

BiesandHansen [51]

2016SpringerAutomotiveNVH Technology

2017SponPressof Taylor& Francis Engineering NoiseControl: Theoryand Practice(4th Edition)

Pang [52]

2018JohnWiley& Sons Noiseand VibrationControl inAutomotive Bodies

XSoundquality

Comprehensive NVcontrol

refinement

fundamentals andevaluations

FEMfor vibration systems

engineering

NVH Continued

Author/EditorYearPublisherTitle

Wang(Ed.) [53] 2020ButterworthHeinemannof Elsevier AutomotiveTire Noiseand Vibrations

Unique feature HandlingRideNVHVehicleTireRoadTheoryPracticeExperimentSimulation

TireNVH Tireseries

Haysand Browne(Eds.) [54]

1974SpringerThePhysicsof TireTraction: Theoryand Experiment

Kovac [55] 1978GoodyearTireTechnology (5thEdition)

XTire manufacture Flemingand Livingston (Eds.) [56] 1979ASTMTire Reinforcement andTire Performance

Clark [57] 1981NHTSAMechanicsof PneumaticTires

Meyerand Walter(Eds.) [58]

1983ASTMFrictional InteractionofTire andPavement

Ridhaand Theves [59] 1994iSmithersRapra Publishing AdvancesinTyre Mechanics

Rivers [60] 2001CharlesC ThomasPub Ltd TireFailuresand EvidenceManual: ForTraffic Accident Investigation

Evans [61] 2002iSmithersRapra Publishing Tyre Compoundingfor Improved Performance

GentandWalter (Eds.) [62] 2005NHTSAThePneumatic Tire

XTirecord

XFirstbookontire (bias)

XTire/Road traction

XTire performance, references

XTirefailure

references

XPassengercar radialtire

TRB [63] 2006TheNational Academies Press Tiresand PassengerVehicle FuelEconomy: Informing Consumers, Improving Performance

Giapponi [64] 2008SAE International TireForensic Investigation: AnalyzingTire Failure

Tireforensic Marketal. (Eds.) [65] 2013AcademicPress ofElsevier TheScienceand Technologyof Rubber(4th Edition)

Leister [66] 2018SpringerPassengerCar TiresandWheels: DevelopmentManufacturingApplication

Nakajima [67] 2019SpringerAdvancedTire Mechanics

Statisticsfor67referencebooks

XRubber properties

XTire/Wheel development

Tirestructural mechanics

Presentbook

TanLi2023ElsevierVehicle/Tire/ RoadDynamics: Handling,Ride,

Fullsystemfor spectralvehicle dynamics

12Vehicle/Tire/RoadDynamics

Forexample,theridemovementofthevehicleandtirehasaneffectonthedistribution ofvehicleloadandtireforceand,thus,influencesthehandling;theridevibrationof thevehicleandtirecontributestothenoisegeneration(low-frequencyNVH).Thatis tosay,ridedynamicsissomethingbridginghandlingdynamicsandNVH.Inthis book,thechapterforhandlingdynamicsprovideselementaryintroductiontoride dynamics,andthechapterforridedynamicsprovideselementaryintroductionto NVH,presentingbettercoherenceandsynergybetweenthesethreemajorareasof vehicle/tiredynamics.Severaltopicsonthedependencebetweenhandling,ride, andNVHarediscussedin Chapter6.

Chapter7 highlightstheroadeffectonhandling,ride,andNVH. Chapter8 talks aboutintelligenttireandautonomousEVwherethevehicle/tire/roaddynamicsplaysa greatrole.

Accompanyingthefundamentaltheories,casestudiesaregiventofacilitatecomprehensionthroughoutthechapters.Besidestheexperimentalimplementations,the state-of-the-artapproachestosimulatingvehicle/tiredynamicsarealsopresented fromtheviewpointofbothindustryandacademia.

References

[1] R.N.Yong,E.A.Fattah,N.Skiadas,VehicleTractionMechanics,Vol.3,ElsevierScience,1984.

[2] V.K.Garg,R.V.Dukkipati,DynamicsofRailwayVehicleSystems,AcademicPress, 1984.

[3] E.J.Haug,ComputerAidedKinematicsandDynamicsofMechanicalSystems:Basic Methods,AllynandBacon,1989.

[4] T.D.Gillespie,FundamentalsofVehicleDynamics,SAEInternational,1992.

[5] W.F.Milliken,D.L.Milliken,RaceCarVehicleDynamics,SAEInternational,1994.

[6] G.Genta,MotorVehicleDynamics:ModellingandSimulation,WorldScientificPublishing,1996.

[7] J.C.Dixon,Tires,SuspensionandHandling,secondEdition,SAEInternational,1996.

[8] J.Y.Wong,TheoryofGroundVehicles,thirdEdition,JohnWiley&Sons,2001.

[9] G.Howard,J.P.Whitehead,D.Bastow,CarSuspensionandHandling,fourthEdition, SAEInternational,2004.

[10] R.Dukkipati,J.Pang,M.Qatu,G.Sheng,S.Zuo,RoadVehicleDynamics,SAEInternational,2008.

[11] R.N.Jazar,VehicleDynamics:TheoryandApplication,Springer,2008.

[12] J.Y.Wong,TerramechanicsandOff-RoadVehicleEngineering:TerrainBehaviour,OffRoadVehiclePerformanceandDesign,secondEdition,Butterworth-Heinemannof Elsevier,2009.

[13] K.Popp,W.Schiehlen,GroundVehicleDynamics,Springer-Verlag,BerlinHeidelberg, 2010.

[14] H.B.Pacejka,TireandVehicleDynamics,thirdEdition,Butterworth-Heinemann,2012.

[15] R.Rajamani,VehicleDynamicsandControl,secondEdition,Springer,2012.

[16] M.Doumiati,A.Charara,A.Victorino,D.Lechner,VehicleDynamicsEstimationUsing KalmanFiltering:ExperimentalValidation,JohnWiley&Sons,2012.

[17] G.Mastinu,M.Ploechl(Eds.),RoadandOff-RoadVehicleSystemDynamicsHandbook, Taylor&Francis,2014.

[18] M.Blundell,D.Harty,TheMultibodySystemsApproachtoVehicleDynamics,second Edition,Butterworth-Heinemann,2015.

[19] M.Abe,VehicleHandlingDynamics:TheoryandApplication,secondEdition, Butterworth-Heinemann,2015.

[20] M.Meywerk,VehicleDynamics,JohnWiley&Sons,2015.

[21] J.P.Pauwelussen,EssentialsofVehicleDynamics,Butterworth-Heinemann,2015.

[22] W.Chen,H.Xiao,Q.Wang,L.Zhao,M.Zhu,IntegratedVehicleDynamicsandControl, JohnWiley&Sons,2016.

[23] H.Taghavifar,A.Mardani,Off-RoadVehicleDynamics:Analysis,Springer,Modelling andOptimization,2017.

[24] J.Balkwill,PerformanceVehicleDynamics:EngineeringandApplications,ButterworthHeinemann,2017.

[25] M.Guiggiani,TheScienceofVehicleDynamics:Handling,Braking,andRideofRoad andRaceCars,secondEdition,Springer,2018.

[26] B.Maclaurin,HighSpeedOff-RoadVehicles:Suspensions,Tracks,WheelsandDynamics,JohnWiley&Sons,2018.

[27] H.Zhang,D.Cao,H.Du(Eds.),Modeling,Dynamics,andControlofElectrifiedVehicles, WoodheadPublishing,2018.

[28] D.Schramm,M.Hiller,R.Bardini,VehicleDynamics:ModelingandSimulation,second Edition,Springer,2018.

[29] B.P.Minaker,FundamentalsofVehicleDynamicsandModelling:ATextbookforEngineerswithIllustrationsandExamples,JohnWiley&Sons,2019.

[30] G.Rill,A.A.Castro,RoadVehicleDynamics:FundamentalsandModelingwith MATLAB®,secondEdition,Taylor&Francis,2020.

[31] D.Vangi,VehicleCollisionDynamics:AnalysisandReconstruction,ButterworthHeinemann,2020.

[32] S.Azadi,R.Kazemi,H.R.Nedamani,VehicleDynamicsandControl:AdvancedMethodologies,Elsevier,2021.

[33] J.J.Henry,J.C.Wambold(Eds.),Vehicle,Tire,PavementInterface,ASTM,1992.

[34] E.Guglielmino,T.Sireteanu,C.W.Stammers,G.Gheorghe,M.Giuclea,Semi-Active SuspensionControl:ImprovedVehicleRideandRoadFriendliness,Springer,2008.

[35] S.Yang,S.Li,L.Chen,DynamicsofVehicle-RoadCoupledSystem,Springer,2015.

[36] G.Genta,A.Genta,RoadVehicleDynamics:FundamentalsofModelingandSimulation, WorldScientificPublishing,2016.

[37] D.J.Inman,VibrationwithControl,secondEdition,JohnWileyandSons,2017.

[38] D.J.Ewins,ModalTesting:TheoryandPractice,ResearchStudiesPressLtd.,1984, pp.1–269.

[39] L.E.Kinsler,A.R.Frey,A.B.Coppens,J.V.Sanders,FundamentalsofAcoustics,fourth Edition,JohnWileyandSonsInc.,2000.

[40] U.Sandberg,J.A.Ejsmont,Tyre/RoadNoiseReferenceBook,INFORMEX,Kisa,Sweden;Harg,Sweden,2002.

[41] M.Harrison,VehicleRefinement:ControllingNoiseandVibrationinRoadVehicles, Butterworth-Heinemann,2004.

[42] F.Fahy,P.Gardonio,SoundandStructuralVibration:Radiation,Transmissionand Response,AcademicPressofElsevier,2007.

[43] H.Fastl,E.Zwicker,Psychoacoustics:FactsandModels,thirdEdition,Springer,2007.

[44] M.J.Crocker(Ed.),HandbookofNoiseandVibrationControl,JohnWiley&Sons,2008.

[45] D.Thompson,RailwayNoiseandVibration:Mechanisms,ModellingandMeansofControl,ElsevierScience,2009.

14Vehicle/Tire/RoadDynamics

[46] X.Wang(Ed.),VehicleNoiseandVibrationRefinement,WoodheadPublishing,2010.

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Definitionsandfundamentals

Thevehicle/tire/roaddynamicsinthisbookcovershandling,ride,andNVH(noise, vibration,andharshness).Thefundamentalsofvehiclehandlingaremultibody dynamics,whichwillbeintroducedin Section2.1.Thefundamentalsofvehicleride arevibrationsofdiscretesystemsandwillbediscussedin Section2.2.Controltheory istypicallyaccompaniedwithvibrationsandthuswillbeintroducedin Section2.3, whichisalsothefoundationfortheautonomousvehiclethatwillbediscussedin Chapter8.Ashigherleveldynamics,NVHincludesbothstructure-borneacoustics (Section2.4)andairborneacoustics(Section2.5).In Section2.6,theacousticresonanceisdiscussed,whichisalsoacommonphenomenoninthevehicle/tire/road system.

2.1Multibodydynamics

Advancedvehiclehandlinganalysisistypicallyconductedthroughnonlinear(withall sourcesofcompliance,stiffness,anddamping)multibodyvehiclemodels,including powertrain/drivetrain,suspensions,steeringsystem,tire/wheelassemblies,andvehiclebody.Inthissection,thebrieftheoryofkinematicsanddynamicsofthemultibody systemisintroduced.

Multibodydynamicsystemsaremechanicalsystemsthatcontainseveralrigidbodiesconnectedbyjoints,suchasindustrialrobots,heavymachinery,spacecraft,automobilesuspensionandsteeringsystem,machinetools,andsoon.Ajointallows certaindegreesoffreedom(DOFs)andpreventsothers,asshownin Table2.1[1]

Forexample, Fig.2.1 showsaplanarslider-cranksystem(2D),composedoffour bodies:thecrank(body1),theconnectingrod(body2),theslider(body3),andthe ground(body4).Body1andbody4areconnectedbyrevolutejoint;body1andbody 2areconnectedbyrevolutejoint;body2andbody3areconnectedbyrevolutejoint; body3andbody4areconnectedbytranslationaljoint.

Tocompletelydescribeamultibodysystem,asetofparameters(coordinates)must bechosentounequivocallydefinetheposition,velocity,andaccelerationofthesystematalltimes.ThenumberofcoordinatesshouldbeequaltothenumberofDOFplus thenumberofconstraints.AplanarbodyhasthreeDOFs(twotranslationsandone rotation)whereasaspatialbodyhassixDOFs(threetranslationsandthreerotations).

Intheplanarslider-cranksystem,eachbodyhasthreeDOFs(xi, yi, φi);thegeneralized coordinatesareexpressedinvectorformas

Table2.1 Differenttypesofjointinmultibodydynamics.

ClassJointSymbolDOFIllustration

ClassIjoint(2D, allows1DOF)

RevoluteR1rotation

Prismaticor translational PorT1translation

ClassIIjoint (3D,allows2 DOFs) CylindricalC1rotationand1translation

UniversalU2rotations

OthersSphericalS3rotations

HelicalorscrewH1rotationand1translation,which aredependent

GearG1motionabouttwoaxesthatcrossin spacebutneverintersecteachother

PlanarPl1rotationand2translations

Fig.2.1 Schematicofaplanarslider-cranksystem.

Thecoordinateswithoutprimesymbolin Fig.2.1 areinglobalreferenceframe, whereasthecoordinateswithprimesymbolareinlocalreferenceframeofeachbody. Theconstraintequationvectoriswrittenas

where ΦK(q, t)isthekinematicconstraintvectorbasedonthejointsand ΦD(q, t)isthe drivingconstraintvectorbasedontheactuators.

Asshownin Fig.2.2,thelocationofarigidbody i intheglobalXYplanecanbe definedbythevector ri andangleofrotation φi.Thevector rP i thatlocatespoint P of rigidbody i inglobalreferenceframecanbewrittenas

where s0i P isthepositionvectorinthelocalreferenceframeXi 0 Yi 0 forpoint P.The expressionforthevirtualdisplacementofpoint P canbeobtainedbytakingthedifferentialoftheaboveequation:

Theequationderivationsforthe3Dmultibodydynamicsareomittedhere,butavehicle’sfrontsuspensionsystemandthekinematicchainmodelingareillustratedin Fig.2.3 forthereference.

Fig.2.2 Transformationfromlocalcoordinatesystemtoglobalcoordinatesystem.

Therearetypicallytwotypesofproblemsforamultibodysystem:kinematicproblemanddynamicproblem.Theformerstudiesthepositionorthemotionofthemultibodysystem,irrespectiveoftheforcesandreactionsthatgenerateit;thelatter involvestheforcesthatactonthemultibodysystemanditsinertialcharacteristics (mass,inertiatensor,thepositionofitscenterofgravityorCG).Thegoverningequationsaresummarizedin Table2.2.

2.2Vibrations

Vehicleridecomfortisassociatedwiththeoscillationsofthecabin.Thissection beginswiththevibrationofsingle-lumpedmasswithoutdamping,thenthevibration ofsingle-lumpedmasswithdamping,andlastlythevibrationofmultiple-lumped masses.

2.2.1Singledegree-of-freedomundampedoscillation

Todescribethemotionsofbodies,Newton’sequationsthatbalancetheforcesassociatedwiththeirmotionneedtobesetup.Asimpleoscillator(oneDOFspring-mass system)isshownin Fig.2.4,where m isthemass, k isthestiffnessorspringconstant, x isthedisplacement,and F istherestoringforce [2].

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