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1、TechnicalReportIRIS-96-346,InstituteforRoboticsandIntelligentSystems,USC,USA,1996SurveyofFeatureResearchJungHyunHanDepartmentofComputerScienceandInstituteforRoboticsandIntelligentSystemsUniversityofSouthernCaliforniaLosAngeles,CA,USAAbstractRecognitionofmachiningfeaturesprovidesabri
2、dgebetweenComputerAidedDesign(CAD)andComputerAidedManufacturing(CAM)ofmachinedparts.CADproducespartdescriptionsintermsofgeometricentitiesordesignfeatures,whichneednotcoincidewiththemanufacturingfeaturesneededbyprocessplanningactivities.TheCADdatamustthereforebeinterpretedsoastogener
3、atepartrepresentationsintermsofmachiningfeatures.WhentheCADdatacontainonlynominalgeometryinformation,featurerecognitionisrequired.WhentheCADdatacontaindesignfeaturesinsertedinafeaturebaseddesignsystem,featuremodelconversionisrequired.Thispapersurveysresearchonfeaturerecognition,feat
4、urebaseddesignandfeaturemodelconversionandraisesimportantissues.1Introduction:WhyFeatures?Intheearly1960sIvanSutherlanddevelopedtheSKETCHPADsystem[Sutherland,1963],amilestoneofresearchachievementincomputergraphics.TheevolutionofcomputergraphicshassinceresultedinthedevelopmentofCompu
5、terAidedDesign(CAD).TheearlyCADsystemswereessentiallyfortwo-dimensionaldrawinganddrafting.Solidmodelingtechniquesemergedtodescribethree-dimensionalproductsunambiguously[Requicha,1980],andwehaveseenaproliferationofsolidmodelersandthree-dimensionalCADsystems.Ontheotherhand,NumericalCo
6、ntrol(NC)machineswere rstintroducedintheearly1950sandsparkedtheresearchanddevelopmentofComputerAidedManufacturing(CAM).Inindustry,CADtechniquesareextensivelyusedtodesignproducts,andCAMtechniquesareusedtomanufacturetheproducts.However,therehasbeenverylittlecommunicationbetweenCADandC
7、AM[Bedworthetal.,1991].ComputerAidedProcessPlanning(CAPP)hasemergedasthecommunicationagentbetweenCADandCAM.CADdataconsistmainlyofgeometricinformationabouttheproduct.GivenCADdata,CAPPgeneratesasequencedsetofinstructionsusedtomanufacturethespeci edproduct.Inordertodothat,CAPPhastoextr
8、actthemanufacturing
