汽车matlab模型

Chapter5VehicleModelinginMatlab施树明[e-mail]ModelingaCruiseControlSystemModelingaCruiseControlSysteminSimulinkModelingaBusSuspensionSystemusingTransferFunctionsBusSuspensionModelinginSimulinkModelingaCruiseControlSystemUsingNewton'slaw,modelingequationsforthissystembecomes:PhysicalsetupandsystemequationsAssumption:1.theinertiaofthewheelsisneglected,2.friction(whichisproportionaltothecar'sspeed)iswhatisopposingthemotionofthecar(1)DesignrequirementsRisetime5secOvershoot10%Steadystateerror2%TosolvethisproblemusingMATLAB,copythefollowingcommandsintoannewm-file:m=1000;b=50;u=500;num=[1];den=[mb];cruise=tf(num,den);MATLABrepresentation1.TransferFunctionModelingaCruiseControlSystemOpen-loopresponsestep(u*cruise)2.State-SpaceWecanrewritethefirst-ordermodelingequation(1)asthestate-spacemodel.TouseMATLABtosolvethisproblem,createannewm-fileandcopythefollowingcommands:m=1000;b=50;u=500;A=[-b/m];B=[1/m];C=[1];D=0;cruise=ss(A,B,C,D);DuCxyBuAxxMATLABrepresentationModelingaCruiseControlSystemOpen-loopresponsestep(u*cruise)ModelingaCruiseControlSysteminSimulinkUsingNewton'slaw,modelingequationsforthissystembecomes:(1)ModelingaCruiseControlSysteminSimulinkBuildingtheModelOpen-loopresponse思考题本节建立的汽车动力学模型有何问题？如何改进？请课后重新建模并编程分析。ModelingaBusSuspensionSystemusingTransferFunctions*bodymass(m1)=2500kg,*suspensionmass(m2)=320kg,*springconstantofsuspensionsystem(k1)=80,000N/m,*springconstantofwheelandtire(k2)=500,000N/m,*dampingconstantofsuspensionsystem(b1)=350Ns/m.*dampingconstantofwheelandtire(b2)=15,020Ns/m.*roaddisturbance(W)*controlforce(u)=forcefromthecontrollerwearegoingtodesign.ModelingaBusSuspensionSystemusingTransferFunctionsPhysicalsetupDesignrequirementsEquationsofmotionTransferfunctionequationEnteringequationsintoMATLABOpen-loopresponseBusSuspensionModelinginSimulinkPhysicalsetupBuildingthemodelOpen-loopresponsea1v1x1a2v2x2WUSum5Sum4Sum3Sum2Sum1SumSpring2k2Spring1k1ScopeMass2-K-Mass1-K-Integrator31sIntegrator21sIntegrator11sIntegrator1sDerivativedu/dtDamper2b2Damper1b1课堂练习学生课堂动手建立悬架系统Simulink模型。上机操作大作业1.思考巡航系统模型存在的问题，构建更加真实的汽车巡航系统模型2.仿真分析随机路面激励下的悬架性能End