典型油船槽形舱壁优化和参数化建模研究

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1、哈尔滨T程大学硕十学位论文典型油船槽形舱肇优化和参数化建模研究ABSTRACTCorrugatedbulkheadshavebeenwidelyappliedinoiltankersbecauseoftheir．1，advantagesintankcleaning·Theweightofcorrugatedbulkheadstakesupaconsiderableproportioninthehullstructureweight．Therefore，alloptimumcorrugatedbulkheadwhose—strengthm

2、eetsthecriteriaofrulesandtotalweightislightestisveryimportanttoreducethelightstructureweightandshipbuildingcost．Usuallyseveralfeasibleschemeswhichwillbeanalyzedandcomparedbydesignersarededucedfromtheresultsofoptimizationcalculationduetothecomplicacyofaproject．Ifeachfinit

3、eelementmodelismodeledandanalyzedseparately,muchtimeiswastedonthereduplicateoperations．、Tosolvethesetwoproblems，aprogramconsistingoftheoptimizationmoduleofcorrugationform，parametricmodelingmoduleandautomaticanalyzingmoduleisdevelopedwimPatranCommandLanguage(PCLlbasedonMS

4、C．Patransoftware．Thesethreemodulesarecorrespondinglyindependenttoeachother,buttheyarejoinedtogetherbythesamedataS缸Icanl．Amathematicmodelismodeledwhiletheaveragebulkheadweightperunitlengthisdefinedastheobjeetivefunction．AccordingtoCommonStructureRulesfordoublehulloiltanke

5、rs，localbendingstress，shearstress，panelbulkingstressandtotalbendingstressaleconsideredasfourconstrains．Intermsofdifferentrestrictionterms，severalschemesarepresentedtodesignersbytheoptimizationmodule．Onthebasisoftheoptimizationsolutions，three-cargo—holdsmodelsoftypicaltan

6、kersaremodeledrapidlybytheparametricmodelingmodulethinkingofcargos’otherinformation．LoadingconditionsandboundaryconditionsareinputaccordingtoCSRrequirementsbyrunningtheautomaticanalyzingmodule．AftersolvingthestiffnessmatrixbyNastran，thestressdistributiononthebulkheadsisd

7、isplayedtostructuredesigners，andhelpsthemtoselectthefittestcorrugatedformfromseveralschemes．So，muchtimeofmodelingaresavedduringthestructureoptimization．Theprogramparametricmethodandthefiniteelementmethod(FEM)basedongeometriesareincludedino也eparametricmodelingmodule．Conse

8、quently,twokeyproblemsaresolvedinthispaper,一oneishowtodescribethegeometrycharactersbyparameters，andtheo