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1、InternationalJournalofAutomotiveTechnology,Vol.9,No.1,pp.29-35(2008)Copyright©2008KSAEDOI10.1007/s12239-008-0004-y1229-9138/2008/038-04OPTIMIZEDDESIGNFORAMACPHERSONSTRUTSUSPENSIONWITHSIDELOADSPRINGS1)*1)1)2)J.LIU,D.J.ZHUANG,F.YUandL.M.LOU1)StateKeyLaboratoryofVibration,ShockandNoise,
2、InstituteofAutomotiveEngineering,ShanghaiJiaoTongUniversity,Shanghai200030,China2)ChinaSpringFactory291,YunchuanRd.,Shanghai200071,China(Received23February2006;Revised20October2006)ABSTRACT-UndesiredlateralforceinevitablyexistsinaMacPhersonsuspensionsystem,whichisliabletodamperrod’ss
3、idewearandpromotesthedamper’sinnerfrictiondecreasingtherideperformancefromthesuspensionsystem.SubstitutinganewsideloadspringwithcurvedcenterlinefortheconventionalcoilspringhasbeenprovenabletosolvetheseproblemsandMulti-bodyDynamicscombiningwithFiniteElementsAnalysismaybeanefficientmet
4、hodinoptimizingitsdesign.Therefore,takingapassengercarasexample,adetailedmulti-bodydynamicsmodelforthesuspensionsystemisbuilttosimulateforcesexertedonthedamperandtheminimizationofitslateralcomponentisselectedasthedesigntargetforthespring.Whenthestructureoptimizationofthesideloadsprin
5、gisperformedusingFEAsoftwareANSYS,itsverticalandlateralelasticcharacteristics,supportedbytestdata,areanalyzed.AfterimportingFEAresultsbacktothesuspensionsystem,thedynamicssimulationcanbeperformedtovalidatetheoptimizationresult.KEYWORDS:Multi-bodysystemdynamics,Optimizationdesign,MacP
6、hersonsuspension,Sideloadspring1.INTRODUCTIONHowever,itisverydifficulttodirectlydefinethestiffnessfromthisspring’sstructureparameterssincetheDuetoitssimplerstructureandlowermanufacture/servicedeformationmechanismofthesideloadspringisstillcost,theMacPhersonstrutsuspensionhasbeenoneoft
7、heinexplicit.Thedesignisusuallybasedontestdatasothatamostpopularsuspensionsystems.However,thesideforcequickerandmoreeconomicalmethodisdemanded.FQinevitablyexistsatthetopofdamperrodasshowninFurthermore,traditionaloptimaldesignemphasizespartsFigure1.Thissideloadmayincreasetheinnerfrict
8、ioninsteadof
