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ID:36501228
大小:2.25 MB
页数:60页
时间:2019-05-11
《基于几何造型的参数化有限元建模和曲面网格生成方法及实现》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、大连理工大学硕士学位论文基于几何造型的参数化有限元建模和曲面网格生成方法及实现姓名:隋晓峰申请学位级别:硕士专业:计算机应用技术指导教师:顾元宪;关振群20020601墨王盐盟堂型堕垄墼些查堡墨堡燮塑些亘塑塑圭堕杰些墨壅里AbstractFiniteelementmethodisapopularnumericalanalysismethod,whichiswidelyappliedinmanyindustrialfieldssuchasaviation,architecture,mechanics,electronicsandchemistry,Ithasbecomethecrite
2、rionoftheanalysisanddesignoptimizationofstructures,andfiniteelementanalysis(FEA)softwarehasbecomethemostimportantpartofCAD/CIMSsystem.Finiteelementmodeling(FEM)isthepre—processofFEA.ItisbasedonCADsystem,andtiesFEAtechniquetoCADsystem.Mostoffiniteelementmodelingmethodsarestaticatpresent.0neethed
3、esignengineersfinishthefiniteelementmodel,itwillbeverydifficulttomodifythemodel.Thisstaticfiniteelementmodelingmethoddoesn’tneedtherequirementofthedynamicdesignofproductinthemodernindustry.Otherwise,mostworkonthesurfacemeshgenerationisbasedonthesingletrimmedsurfaces,andtheworktoclosedsurfaceand
4、combinedsurface,whichareverypopularinengineer,isveryfew.Tosolvetheproblemsmentionedabove,theauthorstudiestheproblemscarefullyandgivesoutsomesolutions.Amethodofsurfacetriangulationbasedonthetraditionalmappingapproachispresentedinthisthesis.Themethodhasfonrfeatures:1)Virtualmovableboundariesaregi
5、ventoassistthemeshgenerationonclosedsurfaces.2、Formakingthemeshesconsistentonthecommonboundariesofadjoiningsurfaces,anewapproachofboundarydiscretizationisemployed.31Theboundary—representationstructureis.adoptedtofulfillthemeshgenerationovercombinedsurfaces.4)Thequalityofsurfacemeshesisimprovedb
6、ypointcreationon3Dscanlinesanddiagonalswappingprocedure.Anapplicationtomeshsurfacesonlydependingongeometriesisdeveloped.TheapplicationistightlyintegratewiththeCADpackageAutoCADfromAutodeskCorporation.Amethodofparametricfiniteelementmodelingforshapeoptimizationispresentedinthisthesis.Themethodha
7、sthreefeatures:11ThedimensionsusedincommercialCADsystemareselectedtobethedesignvariablesofshapeoptimization.2)Amappingbetweengeometryobjectsandfiniteelementobjectssuchasmeshes,structurepropertiesissetuptoassistindefiningfiniteelem
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