基于鲁棒性的船舶结构优化设计研究

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1、AbstractAbstractConventionaloptimaldesigndoesnottakethevariationsofvariablesintoaccount,whichmakesconventionaloptimalsolutionintheedgeofthefeasibleregion.Whenthedesignvariablesfluctuate,theconventionaloptimalsolutionwilldeviatefromthefeasibleregionintounfeasiblesolut

2、ion.Whilerobustdesigntakesthevariationsofvariablesintoaccountearlyinthedesign,anditmakesobjectivefunctionandconstraintsarerobust,thereforerobustdesignoptimizationsolutionhasbetterrobustnessthantheconventionalsolution.ModernrobustdesignmethodisbasedontheTaguchimethoda

3、ndevolved.Thispapermainlydescribesrobustmethodbasedonthetolerancemodel,theminimumsensitivitymethodandsensitivityanalysis.Tolerancemodelmethodtakingintoaccountthevariationofdesignvariableswhichwillcausetheobjectivefunctionandconstraintshavevariation,tofindanewrobustso

4、lutioninthenewfeasibleregion.Thismethodappliestothelinearmodelisnothighandthevariationisrelativelysmall;minimumsensitivitymethodandsensitivityanalysisarethemethodswhichdon’tconsideredesignvariabletolerance.Thispapercombinedtheoryandpractice,andthemajorworkdoneisasfol

5、lows:(1)Useoftolerancemodelmethodfor8700DWTbulkcarrier’smidshipcross-sectionalstructureinrobustoptimaldesign.Platethicknessasdesignvariables,theminimumcross-sectionalareaasobjectivefunction,andconstraintfunctionsusingtheworst-casetoleranceforprocessing.Theresultismor

6、erobustthanspecificationdesign.(2)Itdoesn’tconsidertheredundancyoftheperformanceparameters,sothemethodofminimumvariationisproposedinthispaper.Theminimumvariationbeingproposedinthispapercooperatesthemethodofminimumsensitivityandtheredundancyoftheperformanceparameters,

7、whichwillquantifythevariationsoftheperformanceparameters.Bytherobustoptimizationofthemidshipsectionstructureof40,000DWTbulkcarrier,findingthatthemethodproposedinthispaperhasbetterresultthantheminimumsensitivity.Andthemethodproposedinthispapercanalsobeextendedtootherr

8、obustoptimizationdesigns.(3)InMSC.Patranenvironment27.6mcatamaranfiniteelementmodelwasbuild,throughtheimpositionofboundarycondition