路面輪胎模型建立方法swift

1、SWIFT-TyreAn accurate tyre model for ride and handling studies for high frequencies and short road wavelengthsJan J.M. van OostenHans B. PacejkaJune 19-21, 2000ContentSWIFT-Tyremodel developmentexperimentsvalidationapplicationsSWIFT-Dataset testingSimulation examplesConcludingNewest step: SWIFT-Tyre

2、Short Wavelength Intermediate Frequency TyreA general pragmatic tyre model (3D) for thedevelopment of active chassis control systemsand optimising vehicle ride propertiesSemi-empirical for optimal accuracy and speedUp to 60 HzWavelengths 0.2 mEffective inputs for discrete obstaclesMagic Formula for

3、slip force calculationSWIFT developmentSWIFT model configurationSide slip variationsSide slip variationsSide slip variationsyaw oscillation test standYaw angle variationsYaw angle variationsvalidation at moderate speedsTyre rolling over obstaclesTyre rolling over obstaclesexperiments at very low spe

4、edFlat plank test standTyre rolling over obstaclesexperiments at very low speedVertical forceEffective road plane heightTyre rolling over obstaclesexperiments at very low speedEffective road plane heightTyre rolling over obstaclesexperiments at very low speedLongitudinal forceTyre rolling over obsta

5、clesexperiments at very low speedTyre rolling over obstaclesexperiments at very low speedTyre rolling over obstaclesexperiments at very low speedTyre rolling over obstaclesexperiments at very low speedTyre rolling over obstaclesvalidation at moderate speedsTyre rolling over obstaclesvalidation at mo

6、derate speedsDynamic brakingvalidation at 25 km/hDynamic braking applicationTyre rolling over obstaclesvalidation at moderate speedsTyre rolling over obstaclesvalidation at moderate speedsTyre rolling over obstaclesvalidation at moderate speedsTyre rolling over obstaclesvalidation at moderate speeds

7、Tyre rolling over obstaclesvalidation at moderate speedsTyre rolling over obstaclesvalidation at moderate speedsTyre rolling over obstaclesvalidation at moderate speedsSWIFT-Dataset testingFixed axle height:Cleat drum testingfor vertical ring damping & stiffness Dynamic brakingfor rotational ring da

8、mping & stiffnessYaw oscillationfor lateral ring damping & stiffnessFlat plank testingfor effective inputsVariable axle height:Dynamic tower testingfor vertical residual stiffness and rolling radiusSWIFT-Dataset testingTyre test trailerCleat test standFlat plank test standTower test standYaw oscilla

9、tion test standBrake test standSWIFT-Tyre simulation examplesFull vehicle model,driving over uneven roadat 55 mphFull SWIFT-TyreSWIFT without effective inputsCompared to vehicle measurement dataSWIFT-Tyresimulation examplesVertical axle acceleration, driving over uneven roadMeasured on vehicleFull S

10、WIFT-TyreSWIFT, without effective inputsSWIFT-Tyresimulation examplesShimmy of a landing gearSWIFT-Tyre vs MF-TyreABS simulation1.522.533.546080120Wheel speed and brake torque during ABS simulation with various tyre models1.522.533.54-1000-50005001000Time sBrake torque Nm100Wheel rotational speed ra

11、d/sSWIFT-TyreMF-Tyre, TransientMF-Tyre, Steady StateSWIFT-TyresummaryRigid Ring for tyre belt vibrations up to 60 HzMF slip force calculation between belt and roadElaborate contact model for short wavelength slip variations (road wavelengths 0.2 m)Effective inputs for discrete obstacles ( 0.2 m)yx-z

12、FycMzcNds-dwSWIFT-TyrepropertiesMost important properties shown by SWIFT:Non-linear vertical forceLoad and speed dependent belt frequenciesTyre radius growth with speedEffective tyre radius dependent on speed and loadVertical force influenced by contact point displacement:vertical tyre stiffness dep

13、ends on slip angle and long. slipSlip dependent transient behaviour:relaxation length effects depend on load and slipEigenfrequencies of the tyre belt Describes the non-linear tyre enveloping effects when driving over cleatsSwitch from simple to complex tyre behaviourSWIFT-TyreSWIFT-Tyre application

14、 examples:Dynamic braking/driving (ABS/TCS)Vehicle Dynamic Control (VDC/ESP)Ride comfort & vibrations Suspension and steering system design:combined dynamic braking, cornering and ride4 post rig ride testing.All kinds of tyresConcluding.SWIFT is newest step in DELFT-TYRE modellingrobust, fast and ac