简介：Intheprocessofconceptdesignoffshoreplatforms,itisnecessarytoselectthebestfromfeasiblealternativesthroughcomparisonandfiltering.Fuzzyoptimalselectioninmultiplestagesisanusefulmethodinengineeringdecisionmaking,hutinsomecases,itisdifficulttomakeadistinctionbetweenthefirstalternativeandthesecond.Thereforeitisnecessarytoimprovethefuzzyoptimalselectionmethodwithmultiplestages.Inthispaper,usingfuzzycrossiterationoptimalmodeling,theweightsensitivityanalysisismadefirstly.Thenaseconddecision-makingmethodtosolvefuzzyoptimalproblemsisproposed.Itsbasicprincipleistheinversereasoninginmathematics.Thismethodexpandstheappliedrangeoffuzzyoptimalselection.Finallythismethodisusedintheconceptdesignofoffshoreplatform.Acasestudyshowsthatthismethodisscientific,reasonableandeasytouseinpractice.
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