Object-Oriented Finite Element Analysis

Object-Oriented Finite Element Analysis

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时间:2019-07-03

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1、Object-OrientedFiniteElementAnalysisbyGrahamCharlesArcherB.A.Sc.(UniversityofWaterloo)1985M.A.Sc.(UniversityofWaterloo)1986AdissertationsubmittedinpartialsatisfactionoftherequirementsforthedegreeofDoctorofPhilosophyinEngineering-CivilEngineeringintheG

2、RADUATEDIVISIONoftheUNIVERSITYofCALIFORNIAatBERKELEYCommitteeincharge:ProfessorChristopherThewalt,ChairProfessorGregoryFenvesProfessorJamesDemmel1996ThedissertationofGrahamCharlesArcherisapproved:UniversityofCaliforniaatBerkeley1996Object-OrientedFini

3、teElementAnalysisCopyright1996byGrahamCharlesArcherAbstractObject-OrientedFiniteElementAnalysisbyGrahamCharlesArcherDoctorofPhilosophyinCivilEngineeringUniversityofCaliforniaatBerkeleyProfessorChristopherThewalt,ChairOverthelast30years,thefiniteelemen

4、tmethodhasgainedwideacceptanceasageneralpurposetoolforstructuralmodelingandsimulation.Typicalfiniteelementprogramsconsistofseveralhundredthousandlinesofproceduralcode,usuallywritteninFORTRAN.Thecodescontainmanycomplexdatastructureswhichareaccessedthro

5、ughouttheprogram.Forthesakeofefficiency,thevariouscomponentsoftheprogramoftentakeadvantageofthisaccessibility.Forexample,elements,nodes,andconstraintsmaydirectlyaccessthematricesandvectorsinvolvedintheanalysistoobtainandtransmittheirstateinformation.T

6、hustheybecomeintimatelytiedtotheanalysisdatastructures.Thisnotonlycompoundsthecomplexityofthecomponents,byrequiringknowledgeofthedatastructures,butwritersofnewanalysisproceduresmustbeawareofallcomponentsthataccessthedata.Modificationorextensionofaport

7、ionofthecoderequiresahighdegreeofknowledgeoftheentireprogram.Solutionproceduresandmodelingtechniquesbecomehardcoded.Theresultingcodeisinflexibleandpresentsabarriertopracticingengineersandresearchers.1Recodingthesesystemsinanewlanguagewillnotremovethis

8、inflexibility.Instead,aredesignusinganobject-orientedphilosophyisneeded.Thisabstractionformsastabledefinitionofobjectsinwhichtherelationshipsbetweentheobjectsareexplicitlydefined.Theimplicitrelianceonanothercomponent'sdatadoesnotoccur.Thus,the

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