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1、上海交通大学硕士学位论文ABSTRACTAstudyonmulti-objectiveoptimizationofwhole-shipstructureunderstaticanddynamicconditionABSTRACTByfar,shipstructuraloptimizationproblemismainlylimitedtothelocalstructures,andisalwayssolvedassingle-objectiveoptimizationproblemofminimizingthestr
2、ucturalweightwithstaticstrengthconstraintorfrequencyconstraint,withlessconsiderationofdynamicresponsecharacteristics.Takingaself-propelledcuttersuctiondredgerasthestudyobject,westudiedsomekeytechnologiesaboutfiniteelementanalysis,sensitivityanalysisandmulti-obj
3、ectiveoptimization.Themainresearchworksareasfollows:(1)The3Dfiniteelementmodelofawhole-shipstructurewasbuiltandanalyzed.Wediscussedsomekeytechnologiesaboutfiniteelementcalculationandperformedthestrengthassessment,realeigenvalueanalysisanddynamicresponseanalysis
4、ofaself-propelledcuttersuctiondredger.(2)Thesensitivityanalysisofwhole-shipstructurewasdone.Thechoicesofdesignvariablesformulti-objectiveoptimizationandmulti-objectivehierarchicaloptimizationbasedonthestiffnessdistributionofwhole-shipstructurewasdiscussedandthe
5、sensitivityofmass,stress,displacement,naturalfrequencyandaccelerationwerecalculated.(3)Acomparativestudyonmulti-objectiveoptimizationmethodswasperformed.Themathematicmodelandsimulationdesignflowsuitedformulti-objectiveoptimizationofwhole-shipstructureunderstati
6、canddynamicconditionwerebuiltandwesolvedthemulti-objectiveoptimizationmodelusingtheNSGA-II,NCGAbelongtothedirectmethodandtheidealpoint,fullylayeredbelongtotheindirectmethod,andcomparedtheoptimizingeffectofeachoptimizingmethod.(4)Astudyonmulti-objectivehierarchi
7、caloptimizationbasedonthestiffnessdistributionwasdone.II万方数据上海交通大学硕士学位论文ABSTRACTAdoptedawhole-shipstructuralhierarchicaloptimizationmethodtoperformfivelevelmulti-objectiveoptimization.Keywords:whole-shipstructure,finiteelement,sensitivity,frequencypreserve,dyna
8、micresponsecharacteristics,stiffnessdistribution,multi-objectiveoptimization,directmethod,indirectmethodIII万方数据上海交通大学硕士学位论文目录目录第一章绪论.........................................
