自由曲面结构网格生成-研究与实现

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1、浙江大学硕士学位论文Abstractefficientandtoourminds，thismethodcanbeeasilyintegratedinfiniteelementanalysispackagesorusedindependentlyasapreparatorystageforprogramsofcomputermapping．Thekeyelementofthepresentedmethodistheportrayingofprincipalstresstrajectoriesandthengridgenera

2、tionintheaidofthesecurvesusingamodifiedadvancefrontmethod．Contrastingtotraditionaladvancingfrontmethod，thealgorithminthissectionbeginswithinitialpointcalculationandthendiscretizesstresstrajectorycurvesandboundarycurvesofsurfacegeometrytoformthestartingfront．Thentr

3、ianglesorquadrilateralsaregeneratedbasedonthefrontsegmentsandgrowtowardstheinteriorofthedomain．Severalspecialaspectsofthemodifiedgridgenerationprocesswillbedemonstratedaswellasthecomparisons．Afterseveralpost-processingandtopologyoptimization，thegridresultgeometryd

4、emonstratesthequalityofgivingsatisfactionsufficienttOmeettherequirementsforaesthetic，economicandgoodstructuralperformance．Severalexamplesaregiventoillustratetheefficientandrobustofthemethodonvariouskindsofsurfaces，includingsimpleandcombinedflee．formsurfaces．Theabo

5、vedescribedgridgenerationschemeisefficientandhasbeenimplementedinOpenCASCADEthroughaninterfacetothefiniteelementprogramANSYS．Procedureforplottingstresstrajectoriesandgddgenerationhasbeendeveloped．Experimentshaveshownthat,formostcases，theprogramisrobustandeffective

6、tOsolvethecomplexfree-formsurfaceshellstructuredesign．Attheendofthispaper,asummaryismadewithsomedetailsfortheextensionofthepresentstudy．Keywords：Freesurface；grid；advancingfrontmethod；finiteelement；stresstrajectories；datastructure；OpenCASCADE；IV浙江大学硕士学位论文目录目录致谢⋯⋯⋯⋯

7、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯I摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。IIABSTRACT⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．III目录⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯IV第一章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．1引言⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．2自由曲面

8、结构的发展与现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．21．2．1自由曲面形态学的发展⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．21．2．2自由曲面造型技术⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯51．2．3自由曲面结构设计的一般流程⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。61．3选题的目的和意