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基于自适应近似法的复合材料先进格栅加筋结构优化设计(英文) Title:Optimizationdesignofadvancedlattice-reinforcedcompositestructurebasedonadaptiveapproximationmethod Abstract: Withtheincreasingdemandforlightweightandhigh-performancestructuresinaerospaceandengineeringfields,thedesignandoptimizationoflattice-reinforcedcompositestructureshavebecomemoreandmoreimportant.Inthispaper,asystematicoptimizationprocessisproposedforadvancedlattice-reinforcedcompositestructuresbasedontheadaptiveapproximationmethod.Theobjectiveofthisstudyistoachieveminimumstructuralweightwhilemeetingvariousconstraintsincludingstress,buckling,andnaturalfrequency. Theoptimizationprocessisdividedintotwostages.Inthefirststage,thelattice-reinforcedcompositestructureisparameterizedwithdesignvariablessuchascellsize,cellthickness,andcellshape.Theadaptiveapproximationmethodisusedtoconstructasurrogatemodel,whichcanefficientlypredictthestructuralresponseswithrespecttothedesignvariables.Inthesecondstage,thesurrogatemodelisoptimizedusingaderivative-freeoptimizationalgorithm,whichcanhandlemultipleconstraintsandobjectives. Theproposedoptimizationprocessisappliedtothedesignofanadvancedlattice-reinforcedcompositestructure,whichisusedasanaircraftwingrib.Theoptimizationresultsshowthattheweightofthelattice-reinforcedcompositestructureisreducedby30%comparedtotheoriginaldesign,whilemaintainingthesamestructuralperformance.Thestress,buckling,andnaturalfrequencyconstraintsaresatisfiedduringtheoptimizationprocess.Comparedwithtraditionaloptimizationmethods,theadaptiveapproximationmethodcansignificantlyreducethecomputationalcostandimprovetheefficiencyofthedesignprocess. Keywords:lattice-reinforcedcompositestructure,optimizationdesign,adaptiveapproximationmethod,surrogatemodel,aircraftwingrib Introduction: Compositematerialshavebeenwidelyusedinaerospaceandengineeringfieldsduetotheiroutstandingpropertiessuchaslightweight,high-strength,andcorrosionresistance.Lattice-reinforcedcompositestructuresareaspecialtypeofcompositestructure,whichhaveperiodicarraysofrei