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April1st,20063rdGeorgiaTechAutoShowCarEngineeringConceptDesignWhensettingtothetaskofconceivinganewcar,Iremindmyselfwhatthebasicsofanautomobileare:“aself-propelledmeansoftransportingPEOPLE”ThestartingpointIuseisthePEOPLEneedingtobetransportedIntheFerraricase,itsofarmeans1(racingsingleseaters),2,or4peopleApril1st,20063rdGeorgiaTechAutoShowMeetOSCAR,thecardesigner’smanikin:April1st,20063rdGeorgiaTechAutoShowOSCAR’s“zero”istheso-calledH-Point,whichcorrespondstothehipjointH-pointApril1st,20063rdGeorgiaTechAutoShowStartingfromtheH-point,theinteriorspacerequirementsmaybedefined:H-pointApril1st,20063rdGeorgiaTechAutoShowTheH-Pointtravelsasaresultoftheseat’sadjustmenttravelenvelopeH-pointtravelenvelopeApril1st,20063rdGeorgiaTechAutoShowIfthecarwearedesigningneedsamoreuprightstance,thefoot-to-Hpointverticaldistancewillincrease,whilethelongitudinaldistancewilldecreaseH-pointApril1st,20063rdGeorgiaTechAutoShowExtremesportscarsneedaveryreclinedstanceinordertoreducevehicleheight;thefoot-to-Hpointverticaldistancewilldecrease,whilethelongitudinaldistancewillincreaseH-pointApril1st,20063rdGeorgiaTechAutoShowCarswithmorethanonerowwillderivetheiroveralldimensionalsofromthedistancebetweentherowsofseatsApril1st,20063rdGeorgiaTechAutoShowFerrarishistoricallyhaveneverhadmorethantworowsApril1st,20063rdGeorgiaTechAutoShowThedistancebetweenfrontandrearrowdeterminethelegspacethesecondrowwillhave;thisdimensiondirectlyinfluenceswheelbaseApril1st,20063rdGeorgiaTechAutoShowOncethestanceandinteriorspacehavebeenestablished,thevehicle’sheightbecomesanalmostdirectconsequenceTheseconsiderationareneededinthreedimensions(width)1234April1st,20063rdGeorgiaTechAutoShowSomebasicrequirementsforcabinentryandexitneedtobedefineddoorseallimitspossibledoorhingeaxisApril1st,20063rdGeorgiaTechAutoShowOthervehiclecomponentscannowbelaidoutRarelycancomponentcharacteristicsbespecifiedasavehicle’sconceptprogresses;weareusuallydealingwithagivencomponentset(engine,transmission,suspension)ifnotwithacompleteplatformApril1st,20063rdGeorgiaTechAutoShowWheelpositioningisverycriticalindeterminingfront-to-rearmassbias,whichinturnaffectsgreatlythevehicle’sthreemaindynamicareas:Itisaveryiterativeprocess;ithelpsifthegeneralvehiclearchitecturehasbeenenvisionedbeforestarting,otherwiseitwillturnintoajourneyintheunknown,whichisgenerallyunsatisfatoryCORNERING-TRACTION-BRAKINGApril1st,20063rdGeorgiaTechAutoShowWheelpositioninginwidthisaffectedbyrelativelyfewelements;Frontwheelsareplacedallowingforengine,structure,andsteerangles...VehiclecenterlineApril1st,20063rdGeorgiaTechAutoShow…rearwheelsareplacedallowingmostlyforcabinspaceand/oralignmentwithfrontwheelsVehiclecenterlineCabinSpaceprofileApril1st,20063rdGeorgiaTechAutoShowOthervehiclerequirementshavetobebroughtin...fuelcapacityasaconsequenceofdesiredrangeluggagespaceApril1st,20063rdGeorgiaTechAutoShow...aswellassafetyconsiderations...crashcollapsespaceoccupantspaceforsafetyApril1st,20063rdGeorgiaTechAutoShow...andlegislation:visibilitybumperplacementApril1st,20063rdGeorgiaTechAutoShowAtthispoint,thevehicle’smaindimensionsandproportionsarepreliminarilysetlongitudinally,vertically,...wheelbaseoverhangsandthereforeoveralllengthgroundclearanceandoverallheightApril1st,20063rdGeorgiaTechAutoShow…andlaterallyfrontandreartracksfrontandrearpassengeraccessVehiclecenterlineH-pointFrontandrearheadenvelopesheadspace(roofwidth)overallwidth+dooropeningBodyaccess