资源描述：
《复合材料机翼结构工程优化设计与-分析方法》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。
1、哈尔滨工业大学工学硕士学位论文AbstractDifferentfromtraditionalmaterials,compositematerialhasmanyobviousadvantages,suchashighratioofstrengthtoweight,highratioofstiffnesstoweight,highthermalexpansioncoefficient,hightemperatureresistance,fatigueresistance,impactresistance,andsoon,thereforeith
2、asbeenwidelyappliedtothefieldofaeronauticsandastronautics.Thedesignabilityofcompositematerialsisoneofmajorcharacteristics,materialdesignandstructuraldesigneventuallyreachedahighdegreeofunitybychangingtheangleofthelayerandstackingsequence,layerarea,socompositeoptimizationhasp
3、racticalsignificance.Inthepresentfieldofengineering,therearemainlytwoproblemsfortheoptimizationdesignofcompositematerials,oneistheengineeringsimulationofcompositematerialmainlyusestheFEM.Now,thecommercialFEMsoftwaredoesn’tcombinetheoptimizationalgorithmforcompositematerials,
4、sotheresearchersneedtowritethefiniteelementprogramandoptimizationalgorithmforaspecificproblem.Notonlyincreasetheoptimizationcycle,generalwon'twork.Theotheroneisthecompositedesignexitsahugenumberofdesignvariablescomparedtometalstructure,eachdesignvariableincludingthediscretev
5、ariablesandcontinuousvariablesinfluencesmutually..Inordertoimprovetheefficiencyofoptimization,itisnecessarytochooseasuitableoptimizationalgorithmandreducethenumberofdesignvariable.Fromtheviewpointofengineeringpractice,theexplorationofoptimizationofcompositefiberstackingisfin
6、ished.Firstlyresearchtheconstitutiveequation,failuretheoryandthefiniteelementtheoryoflaminateandsandwichstructure,thenfindamethodofCADandCAEconversion,bywhichmethodestablishedanalyzingthedigitalwingstructure;SecondlywiththeaidofMatlabgeneticalgorithmtoolbox,codesgeneticalgor
7、ithmprogramandperfecttheprogramaccordingtocompositematerialengineeringoptimization,improvingtheefficiencyofoptimizationbycombinationoptimizationstrategy.FinallyconstructoptimizationplatformbysoftwareIsight,whichintegratestheMatlab,MSC.Patran/Nastranandontheplatformthestabili
8、tyofskin,wingbendingstiffnessandstrengthofhoneycombsandwichstructureissimul
