機械產(chǎn)品多學(xué)科綜合優(yōu)化設(shè)計中的建模、規(guī)劃及求解策略.pdf

1、華中科技大學(xué)博士學(xué)位論文機械產(chǎn)品多學(xué)科綜合優(yōu)化設(shè)計中的建模、規(guī)劃及求解策略姓名：陳柏鴻申請學(xué)位級別：博士專業(yè)：機械設(shè)計及理論指導(dǎo)教師：鐘毅芳劉繼紅2001.4.1華中科技大學(xué)博士學(xué)位論文ABSTRACTThisthesisissuppoaedfinanciallybyakeyprojectoftheNationalScienceFoundationofChina，named“ResearchontheTheoriesandMethods

2、ofGeneralizedOptimizationDesignforMechanicalSystems”、AfterestablishingtheArchitectureofMultidisciplinaryDesignOptimization(MDO)forcomplexproducts，somecriticaltechniquesofthisarchitecturesuchasModeling，Planning。andOptimiz

3、ationstrategieshavebeenaddressedFirstlyakindofmultidisciplinarymodelingtechniqueispresentedProductmodelsarereducedto“oneprocessandtwotrees”Thatis，aproductconsistsofsomestructuralunitsachievingspecificfunctionsduringanyst

4、ageofadesignprocessTheseunitsconstitutetheproduct’sDesignObjectTreeThePerformanceTreeofanobjectisconstitutedbythoseperformancesthatmustbesatisfiedbyaunitAccordingtotherelationshipofthestructuretheparametersandtheperforma

5、ncefunctionsofaunitaresortedWiththistechnique，difierentdemandsonaproductCallbeexpressedsufficientlybythedesignersfromoptimalviewsSecondlyaimingatthedifficultyofoptimizingtheentiretask，twoplanningordecompositionmethodsare

6、proposedThehierarchicalplanningmethodincludesadecompositionmodelforminimizingboththesizeofthemastertaskandtheaveragesizeofthesub—tasks，andaresolvingapproachforthismodelThismethodcarlmakethedimensionofsubtaskswell—proport

7、ionedandthesubtaskscallbesolvedbythetraditionaIhierarchicalstrategiesThestructureofeachsubtaskandthecoupledrelationshipamongsubtaskscanbeobtainedbyusingthenonhierarchicalplanningmethodfordi髓rentpartsordifirerentperforman

8、cesThentheconditionsthatthecombinationoftheoptimumofalldisciplinesbecomestheoptimumofthewholesystem，andtheaffectedformsofcoupledfactorsareanalyzedTwodifierenttwo1evelcoordinationstrategiesarepresentedforhierarchicaldisci

9、plinesandnonhierarchicaldisciplinesrespectivelyTheobjectivefunctionofcoordinationIevelandasatisfiedconvergenceconditionforMD0arepresentedOnthebasisofCoUaborativeOptimization(C0)，amultidisciplinaryoptimalmodelisdeveloped，

10、anditisprovedthattheoptimumofthismodelisidenticalwiththatoftheoriginalproblemInordertoimprovetheefficiencyofCOthecoupledrelationshipofdisciplinesisanalyzedAfterclassifyingthecoupledfactors，andaccordingtotheglobalsensitiv

11、ityequations(GSE)，thepropertiesofcouplingsareobrainedThecriterionthatcanconfirmaredundantcoupledfactorhasbeenderivedResponsesurfaceapproachisappliedtoapproximatethosecoupledvariablessubjectedsignificantlytothesystemvaria

12、blesAccordingtothetheoreticalachievementsaboveanMD0softwaredevelopedusingVCandSQLServerisintroducedTheresultsofexamplesprovedthat，MD0furcomplexproductscanhelpdesignerobtaintheentireoptimumofthewholesystem，anditisakindoff