复合式空气悬架性能研究及其钢板弹簧分析计算

湖南大学硕士学位论文复合式空气悬架性能研究及其钢板弹簧分析计算姓名：黄伟申请学位级别：硕士专业：车辆工程指导教师：唐应时20070415II,ADAMSANSYSMSC.FATIGUEIIIAbstractAirsuspensionsystemtakestheairspringastheelasticpart;achievetheelasticityfunctionbasedonthecompressionrealizationofairspring.Nomatterthefullloadortheidling,thepressureintheairsuspensioncanbeaccommodatedautomaticallyalongwiththechangeofloadandthepathconditiontokeeptheheightofthebodychangeless.Usingtheairsuspensioncangreatlyimprovethecomfortablenessofrides.Alongwiththeimprovingcomfortrequest,theairsuspensionissubstitutingthetraditionalleafspringandhelicalspringsuspensiongraduallybecauseofitsuniqueperformanceandthecompatibility.Thispapercarriesonthecomputationandresearchtoanewtypeofcompoundairsuspension.Astiffnesstheoryanalysisofthenewtypeofleafspringwhichusedinthecompoundairsuspensioniscarriedout;ageneralstiffnessformulaiscalculated.Andthestiffnessformulaiscalculatedwiththefiniteelementmethod,itsfeasibilityisconfirmed.Thepaperprovidedausefultheoreticalformulaforthedesignofthistypeofleafspringandtheairsuspension.Thestructuraldesignofairsuspensioniscarriedonintheautomobiledesigntheory;themainpartsoftheairsuspensionaredesignedorselected.ThepapertakesADAMS,thesoftwareofdynamicalsimulationtofoundthesuspensionmodel,andcarriesoutthedynamicalsimulation.Severalcharacteristiccurvesoftheairsuspensionaregainedtosupervisethedesign.TheFEAofthe3DmodelofleafspringiscarriedoutintheuseoftheFEAsoftwarewhichcalledANSYS.Theanalysisgainsthestressandstrainofleafspringunderthemaximalload,andconfirmsthestiffnessoftheleafspring.ThestiffnesscharacteristictestintheguideofGBissimulatedtogainthestiffnesscharacteristicofleafspring.ThepaperusedMSC.FATIGUE,thefatiguelifesoftware,tosimulatethefatiguelifetestoftheleafspringintheS-Nmethod.Thefatiguelifeoftheleafspringisgainedandthefatiguestrengthisconfirmed.Keywords:airsuspension;leafspring;FEA;dynamic;fatiguelifeanalysisI12111.11.1.1191901194719645538[1]1.11.1TS1.1.21)1.12[2]1.22)1.3(a)256MP158256RE1.3(b)3A1.3(c)AAA1.3(d)1.3(d)a)b)c)d)e)1.33)(1.4)416s24s1.44)5)[3]1.1.3[4]51.1.41)2)3)4)[5]Z1.1.580%Benz300SEBenz600“”CAECAE6CAE[6],ADAMS,[7],,Mat-lab/Simulink,[8],ANSYS,,1.21.2.1()[9]1.2.2(L.Euler1707-1783)R.E.T.R.J.7——1.2.3[10~11]()2080[12~14]8A.A.Shabana[15~18]1.2.4——[19]80CAD198780()CAE[20]1.391.3.1()()[21]1954ArgyrisClough·R·W1960(FEM)[22]1)2)3)4)FEA1)2)()()3)101.3.2[23~24]1)2)“”3)4)5)1.4111)CAE2)Z3);4)5)1222.1Z,,,,,,[25]2.1(a)Z2.1(b)(a)(b)2.12.22.2.1[26]2.2.213∆NMQT()1ddddlNMQTδθλϕ×∆=+++∫(2.1)CP1P2∆2.2aCP012.2bP0()20d2lMxUxEI=∫(2.2)P1P22.2cP1P2(2.3)11UUU=++×∆(2.4)1∆P1P2∆P1P2P0=12.2d()()MxMx+()()21d2lMxMxUxEI+=∫(2.5)()()211d2lMxMxUUUxEI+=++×∆=∫(2.6)14()()dlMxMxxEI∆=∫(2.7)2.1(a)(b)(c)(d)2.22.3ZZABCODPR1R2αL1L2θh1h2hLhθhϕϕhxHLxs/2α2.3ZP(kN)L1L2LACDO(mm)sU(mm)h1h2hLACD(mm)hxCDOx(mm)15R1R2ABBC(mm)αABBChθhφθϕ(mm)()()11221coscosRRRRhHαα−+−+=(2.8)112arccos1hHRRα−=++(2.9)()2121sinLRRLα=++(2.10)ADk()()1122LkhhRRLLαα=−++−(2.11)22()LhhkLL=+−(2.12)()11hhkRθθ=−(2.13)()22hhkRϕϕ=+(2.14)()()LhxhkLx=+−(2.15),P,()()()()()()()()()()()()()()12000/200000dddddLLsLMxMxxEIxMxMxMxMxxxEIEIxMMMMEIEIααθθϕϕθϕθϕ∆==+++∫∫∫∫∫(2.16)E()Mx()Mθ()MϕP()()MxPLx=−()()11sinMPLLRθθ=−−()()22sinMPLLRϕϕ=−+()0Mx()0Mθ()0MϕP1()0MxLx=−()011sinMLLRθθ=−−()022sinMLLRϕϕ=−+0IAO30112IBh=×()IθABθ16()()[]33111212IBhBhkRθθθ=×=×−()IϕABϕ()()[]33221212IBhBhkRϕϕϕ=×=×+()IxCDOx()()()331212LIxBhxBhkLx=×=×+−(2.16)1∆2∆3∆4∆()()()()()112013/2/20133131dd1242LLssMxMxPLxxxEIEBhPLsLLEBh−∆===−−−∫∫(2.17)()()()()()122023023222dd1221213ln22LLLLLLLMxMxPLxxxEIxEBhkLxhhhPkEBhhh−∆==+−=−−++∫∫(2.18)()()()()()()()2011330011212211111111322211211111sindd12112CisincosSicossiCisincosSi12MMPLLREIEBhkRLLkRhhkRkRhhhhhkRkRkRkRLLkRkRkRhhhhkRkRkRkRhkRPEBααθθθθθθθααααα−−∆===−−−−−−−++−−++−+++−+∫∫()()()()()()21311111211111123112111n12222cosCisinSi222cosCi21sin2cossin2222sinSi2hkRhhhhkRkRkRkRkRhhhkRkRkRkRhkRkRkRhkRhhhkRkRkRααααααααααα+−+−++−−−++−−++−−−+(2.19)17()()()()()()()()()202243002222222222222222322222222222sindd12112CisincosSicossinCisincosSi12MMPLLREIEBhkRLLkRhhkRkRhhhhhkRkRkRkRLLkRkRhhhhkRkRkRkRkRhkRhkRPEBααϕϕϕϕϕϕϕααααααα−+∆===+−−−+−++−+−+−−++∫∫()()()()()32222222222222322222212222cosCisinSi222cosCi21sin2cossin2222sinSi2hhhhkRkRkRkRkRhhhkRkRkRkRhkRkRkRhkRhhhkRkRkRααααααααα+−−+++−++++++(2.20)Si()0sinSidxtxtt=∫Ci()cosCidxtxtt∞=−∫1234PPC==∆∆+∆+∆+∆4EBW(2.21)()()2331331222213132ln22LLLhhhWLsLLhkhhh=−−−−−+++18()()()212211111111322211221111113111112CisincosSicossinCisincosSi3122cosCiLLkRhhkRkRhhhhhkRkRkRkRLLkRkRkRhhhhkRkRkRkRhkRhkRhhkRkRkRααααααα−−−−−−++−+−++−+++−+−+−()()()()()1121111112311211122sinSi222cosCi21sin2cossin2222sinSi2hhkRkRhhhkRkRkRkRhkRkRkRhkRhhhkRkRkRααααααααα++−−−++