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ID:36593592
大小:7.88 MB
页数:141页
时间:2019-05-12
《基于分布参数传递函数方法的被动约束层阻尼结构动力学分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、国防科学技术大学博士学位论文基于分布参数传递函数方法的被动约束层阻尼结构动力学分析姓名:李恩奇申请学位级别:博士专业:航空宇航科学与技术指导教师:唐国金20071001国防科学技术大学研究生院博七学位论文4BSTRACTPassiveconstrainedlayerdamping(PCLD)isbroadlyusedinaerospacestructuresforvibrationcontrol,whichhasmanyadvantagessuchaswidecontrolfrequency,highreliability,goodrobustness,simp
2、lestructuralformandlowcost.TheemphasisofthisdissertationiStoestablishameth【odologicalsystemforPCLDstructuredynamicanalysiswithdistributedparametertransferfunctionmethod(shortened髂transferfunctionmethod),andtosolveaseriesofspecialsubjectproblemsbasedonthemethodologicalsystemsuchasdyna
3、micoptimizmionofPCLDstructure.parameterrandomanalysisandmodelupdatingofviscoelasticmaterial.T11emainachievementsaresummarizedasfollows:FordynamicproblemsofthebeamwithfullandpartialPCLDtreatment.thetransferfunctionmethodisproposed.Themotiondifferentialequationsandboundaryconditionsare
4、derivedforPCLDbeambytheHamiltonprinciple.Thesystemequationinstatespaceisthenestablished,andtheclosed·formsolutionsareobtainedbythetransferfunctionmethod.FordynamicproblemsofthePCLDplate,thetransferfunctionmethodisproposed.Themotionequationsandboundaryconditionsarededucedfortheplate州t
5、hmllPCLDtreatment.andtheanalyticalsolutionsoftheplatewithtwooppositesimply-supportededgesarepresentedthroughtrigonometricseriesexpansion.Inordertoadapttoarbitraryboundaryconditions,thePCLDplateisdividedintoseveralstripelementsinbreadth,andtheelementstiffnessmatrixandelementmassmatrix
6、arededuced.Then.thesemi—analyticalsolutionsoftheplate、ⅣithfullandpartialPCLDtreatmentareobtainedFordynamicproblemsofthePCLDcylindricalshell,thetransferfunctionmethodisproposed.BasedonDonnellassumptions,themotionequationsandboundaryconditionsarederivedforthecylindricalshellwithfullPCL
7、Dtreatment,andtheequationsaresolvedbythe仃ansferfunctionmethod.Furthermore.thedynamicproblemofthecylindricalshellwithpartialring—shapePCLDtreatmentisanalyzed.Optimizationmodelsofsingle··objectiveandmulti·-objectiveareestablishedforPCLDdesignparameters.Insingle·objectiveoptimization,th
8、eaimistomaxi
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