adams悬架性能分析

1、Adams/car 的悬架分析(SuspensionAnalyses),共提供悬架 38 种性能。对所有悬架均提供：-SteerandCamberCompliance/单位回正力矩的转角或CamberAngle/外倾角CasterAngle/后倾角DiveBraking/LiftBraking/制动点头/制动抬头Fore-AftWheelCenterStiffness/悬架纵向刚度Front-ViewSwingArmLengthandAngle/前视图（虚拟）摆臂长度和角度KingpinInclinationAngle/主销内倾角LateralForce-Deflection,Steer,an

2、dCamberCompliance/?Lift/SquatAcceleration/抬头(一般指启动时前悬架抬升，后悬架压缩)?PercentAnti-DiveBraking/PercentAnti-LiftBraking/（前悬架）防点头/（后悬架）防抬升PercentAnti-LiftAcceleration/PercentAnti-SquatAcceleration/?AligningTorque外倾角?RideRate/悬架动刚度?RideSteer/悬架转向性能?RollCamberCoefficient/侧倾轮倾系数（车身侧倾时车轮侧倾角与车身侧倾角的比值）RollCasterCo

3、efficient/RollCenterLocation/侧倾中心位置?RollSteer/Ridesteeristheslopeofthesteerangleversustheverticalwheeltravelcurve.Ridesteeristhechangeinsteerangleperunitofwheelcenterverticaldeflectionduetoequalverticalforcesatthewheelcenters.Positiveridesteerimpliesthatthewheelssteertotheright,asthewheelcentersmove

4、upward.?Side-ViewAngle/Theside-viewangleisthewheelcarrierside-viewrotationangle.Itispositiveforaclockwiserotation,asseenfromtheleftsideofthevehicle.?Side-ViewSwingArmLengthandAngle/Theswingarmisanimaginaryarmextendingfromthewheelssideelevationinstantcenterofrotationtothewheelcenter.Forfrontsuspensio

5、ns,thesignconventionisthatwhentheinstantcenterisbehindthewheelcenter,theswingarmhasapositivelength.Forrearsuspensions,thesignconventionistheopposite:whentheinstantcenterisaheadofthewheelcenter,theswingarmhasapositivelength.Theangleoftheswingarmistheangleitmakestothehorizontal.Apositiveangleforaposit

6、ivelengthiswhenthearmslopesdownwardfromthewheelcenter.Apositiveangleforanegativelengtharmiswhenthearmslopesupwardfromthewheelcenter.SuspensionRollRate/悬架侧倾刚度ToeAngle/前束角TotalRollRate/总侧倾刚度?WheelRate/悬架刚度对转向悬架还提供:?Ackerman/Ackermanisthedifferencebetweentheleftandrightwheelsteerangles.ApositiveAckerma

7、nindicatesthattherightwheelisbeingsteeredmoretotherightthantotheleft.?AckermanAngle/Ackermanangleistheanglewhosetangentisthewheelbasedividedbytheturnradius.Ackermanangleispositiveforrightturns.?AckermanError/AckermanerroristhedifferencebetweenthesteerangleandtheidealsteerangleforAckermangeometry.Bec

8、auseAdams/Carusestheinsidewheeltocomputetheturncenter,theAckermanerrorfortheinsidewheeliszero.Foraleftturn,theleftwheelistheinsidewheelandtherightwheelistheoutsidewheel.Conversely,forarightturn,therightwheelistheinsidewheelandtheleftwheelistheoutsidewheel.PositiveAckermanerrorindicatestheactualsteer

9、angleisgreaterthantheidealsteerangleortheactualissteeredmoretotheright.?CasterMomentArm(MechanicalTrail)/Castermomentarmisthedistancefromtheintersectionofthekingpin(steer)axisandtheroadplanetothetirecontactpatchmeasuredalongtheintersectionofthewheelplaneandroadplane.Castermomentarmispositivewhenthei

10、ntersectionofthekingpinaxisandroadplaneisforwardofthetirecontactpatch.?IdealSteerAngle/IdealsteerangleisthesteerangleinradiansthatgivesAckermansteergeometryor100%Ackerman.ForAckermansteergeometry,thewheel-centeraxesforallfourwheelspassthroughtheturncenter.NotethatAdams/Carusesthesteerangleoftheinsid

11、ewheeltodeterminetheturncenterforAckermangeometry.Therefore,theidealsteerangleandthesteerangleareequalfortheinsidewheel.Whenmakingaleftturn,theleftwheelistheinsidewheel.Conversely,whenmakingarightturn,therightwheelistheinsidewheel.Apositivesteerangleindicatesasteertotheright.?OutsideTurnDiameter/Out

12、sideturndiameteristhediameterofthecircledefinedbyavehiclesoutsidefronttirewhenthevehicleturnsatlowspeeds.Adams/Cardeterminesthecirclebythetirescontactpatchforagivensteerangle.Foraleftturn,therightfrontwheelistheoutsidewheel.Forarightturn,theleftfrontwheelistheoutsidewheel.?PercentAckerman/PercentAck

13、ermanistheratioofactualAckermantoidealAckermanexpressedasapercentage.PercentAckermanislimitedtotherangefrom-999%to999%.PercentAckermanispositivewhentheinsidewheelssteerangleislargerthantheoutsidewheelssteerangle.?ScrubRadius/Scrubradiusisthedistancefromtheintersectionofthekingpin(steer)axisandtheroa

14、dplanetothetirecontactpatchmeasuredalongtheprojectionofthewheel-centeraxisintotheroadplane.Scrubradiusispositivewhentheintersectionofthekingpinaxisandtheroadplaneisinboardofthetirecontactpatch.?SteerAngle/Rollsteeristhechangeinsteerangleperunitchangeinrollangle,ortheslopeofthesteer-angle-verses-roll

15、-anglecurve.Rollsteerispositivewhenforincreasingrollangle(leftwheelmovingup,rightwheelmovingdown)thesteerangleincreases(wheelssteertowardtheleft).?SteerAxisOffset/Thesteeraxisoffsetistheshortestdistancefromthesteer(kingpin)axistothewheelcenter.Thesteeraxisoffsetismeasuredintheplaneperpendiculartothe

16、steeraxisandpassingthroughthewheelcenter.Thesteeraxisoffsetisalwayspositive.Thesteeraxisoffset-longitudinalisthecomponentofthesteeraxisoffsetalongtheintersectionofthewheelplanewiththeplaneperpendiculartothesteeraxisandpassingthroughthewheelcenter.Thesteeraxisoffsetlongitudinalispositivewhenthewheelcenterisforwardofthesteeraxis.Thesteeraxis