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1、TheCAEAnalysisandOptimizationonFrameofFSAEBasedonFullVehicleofDynamicsSimulationADissertationSubmittedfortheDegreeofMasterCandidate:ChenBinSupervisor:Prof.MaLimingChang’anUniversity,Xi’an,China摘要車架作為FSAE賽車最重要的零部件之一,它是FSAE賽車大部分零部件和總成的載體,支撐著發(fā)動機、轉(zhuǎn)向器、油箱和駕駛員等所有簧上質(zhì)量的有關(guān)機件。車架的功能是支撐連接FS
2、AE賽車的各零部件,并承受來自車內(nèi)外的各種載荷,為此車架應(yīng)該具有足夠的強度、合適的剛度、合理的動態(tài)特性和輕量化度。本文使用ADAMS/car虛擬樣機仿真軟件建立FSAE賽車的整車動力學模型,對FSAE賽車進行多工況仿真,結(jié)合比賽相關(guān)要求和規(guī)定,求出FSAE賽車在各個工況下的不同部件與車架連接點的受力;在此基礎(chǔ)上使用ANSYS有限元分析軟件對FSAE賽車車架進行有限元強度、剛度和模態(tài)分析;最后,對車架進行優(yōu)化,得到安全性更高、操穩(wěn)性更好和輕量化度更高的FSAE賽車,并為FSAE賽車的再設(shè)計提供理論依據(jù)和建議。通過對FSAE賽車車架的有限元分析,對車架的
3、強度、剛度和模態(tài)特性進行了校核,車架各工況的最大應(yīng)力均小于材料的許用應(yīng)力,車架的固有頻率在賽車的非共振區(qū)內(nèi),因此車架的強度和模態(tài)特性無需優(yōu)化;車架的剛度存在優(yōu)化的空間,進而對車架的剛度進行優(yōu)化設(shè)計,從而使車架具備更高的剛度,提高FSAE賽車抵抗變形的能力和操縱穩(wěn)定性。關(guān)鍵詞:方程式賽車車架,ADAMS/car,ANSYS,靜力學分析,模態(tài)分析IAbstractAsoneoftheprincipalparts,theframeistheFSAEracingcarcarrierofmostofthepartsandassemblies,itsupport
4、stherelatedpartsofallsprungmass,suchasengine,deflector,tankanddriverandsoon,meanwhileitreceivethedifferentkindsofforceandmomentwhichallsprungmasshanddownto.Wherefore,theframeshouldhaveadequatestrength,appropriatestiffness,reasonabledynamicbehaviorandlight-weightdegree.Inthispap
5、erADAMS/carvirtualprototypesimulationsoftwareisusedtoestablishtheentirecardynamicsmodelofFSAEracingcar,somesimulationofmulti-conditionsimulationforFSAEracingcarisdone,combinedwithrelatedrequirementsandregulations,andthestressofdifferentpartsandframeconjunctionateachconditionofF
6、SAEracingcarisdetermined;thenANSYSfiniteelementanalysissoftwareisusedtoproceedtheanalysesoffiniteelementstrength,stiffnessandmodalityforFSAEracingcar;intheendtheframeisoptimizedtogettheFSAEracingcarwhichhavehighersecurity,betterhandlingstabilityandhigherlight-weightdegree,meanw
7、hileprovidetheoreticalbasisandsuggest.AccordingtothefiniteelementanalysisofFSAEracingcar,inthispaperthestrength,stiffnessandmodalityoftheframeischecked,indifferentconditionsthemaximumstressoftheframeislessthanthematerialpermissiblestress;andtheinherentfrequencyoftheframeiswithi
8、nthenon-resonanceregionofracingcar,sothestrengthanddyn