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1、浙江大學(xué)碩士學(xué)位論文造型系統(tǒng)中的特征及用戶自定義特征技術(shù)姓名:曾震宇申請學(xué)位級別:碩士專業(yè):計(jì)算機(jī)應(yīng)用指導(dǎo)教師:董金祥20000301塑堊查堂墮主蘭垡笙苧:!!塑蘭!旦——AbstractFeaturebasedmodelingsystemiSthelastedresultofresearchinintegrationofCAD/CAPP/CAMThisthesisfocusesonfeaturetechnologyin3Dmodeli
2、ngsystemInordertoovercometheshortageofpredefinedfeaturessetinacommonfeature—basedmodelingsystem,theauthorsuggestsanUDF(UserDefinedFeatures)technology,whichisbasedontheproceduralrepresentationoffeatureTheentirealgorithmha
3、sbeenimplementedinafeaturebasedmodelingsystemGSCADFeaturebaseddesignisthemaincharacterofcurrentprevailingparamemcsolidmodelingsystemThispaperdiscussesthefeaturetechniquesinfeaturebasedmodelingsystemTherearethreemajorfeat
4、ure—creatingmethods:interactivefe;aturedefinition,automaticfeaturerecognitionanddesignbyfeature,AmongthemdesignbyfeatureIsbestwaytosupporttheintegrationofCAD/CAPP/CAMintheconcurrentdesignenvironmentanddesignbyfeatureiSad
5、optedbyGSCADsystemFeaturerepresentationiSanimportantSUbjectoffeaturetechniquesInGSCADsystem,thefeatureiSprocedurallyrepresentedComparingwithdesertptirerepresentationoffeature,thekeycharacterofproceduralrepresentationoffe
6、atureisthatitiSfitforparametricdesignandisconvenientforcreatingfeaturelibraryandrepresentinguserdefinedfeatureThispapersuggeststhefeaturerepresentationinGSeADsystem,anddiscussesthepositionandorientationoffeatures,realiza
7、tionofparametricfeatureThispaperdiscussestherealizationofuserdefinedfeatureinfeature—baseddesignmodelingsystemBasedonuserdefinedfeaturetechniques,enduserscanenlargethefeamrelibrarySOuser—definedfeaturemakeacommonpurposem
8、odelingsystemmeettheengineeringrequirement,ThispaperproposesasimpleandhighefficientmethodofrealizationofuserdefinedfeatureInGSCAD,adesignhistorycanberepresentedbyafeature—dependentrelationshipgraph,inwhichanoderepresents
9、abasefeatureincludingpre—definedfeatureanduserdefinedfeatureanarcrepresentsafeaturedependentrelationshipBasedproceduralrepresentationoffeature,designhistorycanbesavedasauserdefinedfeature,whichincludesthepositionandorien
10、tationsparametersofeverybasefeatureAndthefeaturedependentrelationshipgraphdecidestheinstantiationofthisuser—definedfeatureThispapersuggeststherulesofcreatingthefeaturedependentrelationshipgraphFinally,thispaperbringsforw
11、ardexamplesofuser—definedfeature,whichdescribetherealizationofuser—definedfeatureinGSCADsystemTheseexamplesprovethatthemethodofrealizationofuserdefinedfeatureispracticableKeyWords:Feature,F(xiàn)eature—basedmodeling,geometrymo
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