造型系統(tǒng)中的特征及用戶自定義特征技術.pdf

1、浙江大學碩士學位論文造型系統(tǒng)中的特征及用戶自定義特征技術姓名：曾震宇申請學位級別：碩士專業(yè)：計算機應用指導教師：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，Feature—basedmodeling，geometrymo