轿车前轮主销后倾角算法

ISSN100020054CN1122223öN()JTsinghuaUniv(Sci&Tech),20064652006,Vol.46,No.529ö3572427271,1,1,1,2(1.,100084;2.,212013):2005205230:(2005037338):(19652),(),,:,,E2mail:[e-mail]:,,,,73.4,GBöT6323.4297,:;;;:U461.6:A:100020054(2006)0520724204CalculationofthefrontwheelcasterangleinpassengercarsWEIDaogao1,LIKeqiang1,WANGXiaofeng1,JINDafeng1,ZHOUKongkang2,HUANGJucheng3(1.StateKeyLaboratoryofAutomotiveSafetyandEnergy,TsinghuaUniversity,Beijing100084,China;2.SchoolofAutomobile,JiangsuUniversity,Zhenjiang212013,China)Abstract:Thefrontwheelalignmentisaproblemforautomotivesuspensionsystemdesigns.Amethodwasdevelopedtocalculatethecasterangleofthefrontwheelsbasedonthestructureandperformanceofpassengercarfrontwheelindependentsuspensionsandtirecorneringproperties.ThecasterangleinatestvehiclemadeinChinawasthensetusingthedesiredfrontwheelalignmentparametersforahighspeedselfaligningtestatthetestgrounds.Atestscoreof73.4,whichagreeswithGBöT6323.4297,showsthatthecalculatingmethodologyisaccurateandveryusefulincardesigns.Keywords:passengercar;casterangle;tire;calculatingmethodology,(MacPhersonSuspension),,,1,,1.11);,Fiala[13],,[4],Fy=-132+1273FzL+kCC.(1):Fy;Fz;L;kC;C;,=ktanHFzL,k,H,H=0.0267(4.5-L)+0.0064,LN=Nt+Nc=AR+lö6.(2):N;Nt;Nc;A;R;ll,[57],Komandi[5],:l=(D-$)$,(3)$=CQ(0.5G1)0.85b0.7D0.45p0.6.(4):D;$;b;CQ,Q=0.0015b+0.42;G1;p,M1=2FyNcosA.(5)A5,cosA1,(1)(2)(5)M1=2Fy(AR+lö6).(6)2),,,[4]M2=14G1qsin(B+C)õcsc2D1sin[acot(BöL+cotD1)]1+(BöL+cotD1)2+sinD1.(7):q,B,D1,B3),,4),(6)(7):Mt=2Fy(AR+lö6)+14G1qsin(B+C)õcsc2D1sin[acot(BöL+cotD1)]1+(BöL+cotD1)2+sinD1.(8)1.2,3,[8],M2,,:Mt=G1K(f1r1+2qf2r2öh)+M2+UG1KR.(9):f1f2,r1r2,K,h,U2MtMt,,,,,:Mt=Mt,(10)(8)(9)14G1qsin(B+C)õcsc2D1sin[acot(BöL+cotD1)]1+(BöL+cotD1)2+sinD1+2Fy(AR+lö6)=G1K(f1r1+2qf2r2öh)+M2+UG1KR.(11)(11)A=-14G1qsin(B+C)õcsc2D1sin[acot(BöL+cotD1)]1+(BöL+cotD1)2+sinD1+G1K(f1r1+2qf2r2öh)+M2+UG1KRõ12FyR-16R.(12),(12)D1$D,$D$r[9]:$r=uL$D.(13):$D;u(13)$D=L$röu(12):A=-14G1qsin(B+C)õcsc2(L$röu)sin[acot(BöL+cot(L$röu))]1+(BöL+cot(L$röu))2+sin(L$röu)+G1K(f1r1+2qf2r2öh)+527,:M2+UG1KR12FyR-l6R.(14)33.1GBöT6323.4297,3s$rEr,:N$r=60+40($r60-$r)ö($60-$100),(15)NEr=60+40(Er60-$r)ö(Er60-Er100).(16):N$r;$r60$r100;$r;NEr;Er60;Er60Er10011$rEr$r60ö(()õs-1)$r100ö(()õs-1)Er60ösEr100ös0.5000.0000.6000.300,(14),GBöT6323.4297,601(14)$r0.5,B=110.5,H=5Fy22G1qhBCf1f2r1r2pLRBuUKkNmmmm()()mmmmMPammmmmmmõs-17.69523011.00.50.00350.004020170.203002470143033.30.60.823:120kmöh2(3)l(14),A=2.0497,A=20.303.2,GBöT6323.429770%,3,(14)A=20.30120kmöh,33t$rfRcErt$rfRcErs()õs-1Hz%ss()õs-1Hz%s11.340.4411.0850.10.2510.4251.20-0.1651.7987.00.6000.51521.160.4411.0572.70.310.4121.210.0091.7981.70.5240.40431.120.3030.9965.50.2980.3741.21-0.2111.7578.80.7920.4671.210.3951.0462.80.2860.4041.21-0.1221.7882.50.6390.462:t,f,R,c3,(15)(16)44N$rNErNH68.486.173.490.078.4:NH73.4,,(14)4,,627()2006,46(5),,(References)[1].[M].:,1991.GUOKonghui.HandlingDynamicsofAutomobile[M].Changchun:JilinScienceandTechnologyPress,1991.(inChinese)[2],,.[J].(),1999,39(4):6477.SHANGJin,GUANDihua,LHYam.Researchontiresteadystatecorneringpropertieswithmodalparametersmodel[J].JTsinghuaUniv(Sci&Tcch),1999,39(4):6477.(inChinese)[3].[M]..:,1998.ANBUMasa.RunandHandleofAutomotive[M].CHENXinbo.Beijing:ChinaMachinePress,1998.(inChinese)[4].[D].:,2003.WEIDaogao.ResearchonCalculatingmethodologyandTestofAligningParametersofFrontWheelofVehicle[D].Zhenjiang:JiangsuUniversity,2003.(inChinese)[5]KomandiG.Thedeterminationofthedeflectioncontactareadimensionsandloadcarryingcapacityfordrivenpneumatictyresoperatingonconcretepavement[J].JTerramechanics,1976,13(1):1520.[6]UpadhyayaSK,WulfshonD.Relationshipbetweentyredeflectioncharacteristicsand22Dtyrecontactarea[J].ASAE,1990,33(1):2530.[7]GodboleR.Thepredictionoftractiveperformanceonsoilsurfaces[J].JTerramechanics,1993,30(6):443459.[8],,,.[J].,1996,27(3):3236.WANGBoliang,ZHOUJianli,ZHAOBo,etal.Discussiononcalculatingmethodologyandtestofaligningparametersoffrontwheeloftractor[J].TranstheSocietyofAgricultureMachinery,1996,27(3):3236.(inChinese)[9].[M].:,1996.YUZhisheng.TheoryofAutomobiles[M].Beijing:ChinaMachinePress,1996.(inChinese),,,,,10,13,1625mAhög,5.7%(),(DOE),,,,(PEMFC),,(http:öönews.tsinghua.edu.cnö)727,: