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1、Applications–Chassis&SuspensionIntroductionThechassisisconsideredtobeoneofthesignificantstructuresofanautomobile.Itistheframewhichholdsboththecarbodyandthepowertrain.Variousmechanicalpartsliketheengineandthedrivetrain,theaxleassembliesincludingthewheels,t
2、hesuspensionparts,thebrakes,thesteeringcomponents,etc.,areboltedontothechassis.Thechassisprovidesthestrengthneededforsupportingthedifferentvehicularcomponentsaswellasthepayloadandhelpstokeeptheautomobilerigidandstiff.Consequently,thechassisisalsoanimporta
3、ntcomponentoftheoverallsafetysystem.Furthermore,itensureslowlevelsofnoise,vibrationsandharshnessthroughouttheautomobile.Suspensionisthetermgiventothesystemofsprings,shockabsorbersandlinkagesthatconnectsthevehicletoitswheels.Thesuspensionsystemservesadualp
4、urpose.Itcontributestothecar'sroadperformance,thebrakingcharacteristicsforgoodactivesafetyandthedrivingpleasure.Italsokeepsthevehicleoccupantscomfortableandreasonablywellisolatedfromroadnoise,bumps,andvibrations.ChassisdesignconceptsOriginally,automobiled
5、esignsusedthebody-on-frameconstructionwhereaload-bearingchassisconsistingofaladderframe,thepowertrain,andthesuspensionformedthebasevehiclewhichthensupportedanon-load-bearingbody.Inthebeginningusedonalmostallvehicles,theladderframehasbeengraduallyphasedout
6、onpassengercarsaroundthe1940sinfavorofperimeterframes.Inthesecondhalfofthelastcentury,theframechassisdesignwasmoreandmoredisplacedbymonocoqueconstructions,integratingthebodyandchassisintoasingleunit.Today,themonocoqueconceptismoreorlessstandardforpassenge
7、rcars.Thetraditionalbody-on-frameconceptisnowadaysmainlyusedforheavytrucksandbuses.Thelightweightingpotentialofaluminiumcanbeexploitedinallthedifferentautomobilechassistypes:FrameChassis:Theladderframewithtwostraightlongitudinalbeamsinterlinkedbyseveralcr
8、ossmembersistheoldestandsimplestformsofallautomotivechassisdesigns.Intheperimeterframe,themiddlesectionofthelongitudinalbeamswasdisplacedoutboardofthefrontandrearrails.Thisdesignallowsforalowerfloorpan,andthereforea
