基于光纖光柵傳感和應(yīng)變動力參數(shù)的損傷識別研究.pdf

1、分類號UDC密級學(xué)校代碼_IQ盛97武膊f筍大李學(xué)位論文目基于光纖光柵傳感和應(yīng)變動力參數(shù)的損.傷識別研究StudyonStrainRelatedDvna們nieParameterbased文目題英題研究生姓名指導(dǎo)教師副指導(dǎo)教師柯孟龍姓名劉明堯二職稱教授學(xué)位博士單位名稱機電工程學(xué)院郵編430070姓名職稱學(xué)位單位名稱郵編申請學(xué)位級別碩士學(xué)科專業(yè)名稱機械制造及其自動化論文提交日期20n年4月論文答辯日期20n年5月學(xué)位授予單位武漢理工大學(xué)學(xué)

2、位授予日期答辯委員會主席周祖德教授評閱人周祖德教授王曉光教授2011年5月AbstraetDamagesaffeetthesafetyandPerfmaneeofstruetures.Partieularly，mierosizeloealdamageineontinualoPeratingdevieeeaneauseirreversiblestructuralfraeture.Loealdamage15oftenhardtobeiden

3、tifiedbydisPlaeementrelatedParameters，butstrainrelatedParametersarequitesensitivetoit，whieh15oPtimalehoieeflocaldamageidentifieation.Currently，damagedeteetionbasedondynamieParametersisahotsPotofstrueturalhealthmonitoring

4、，andstraind戶amieParameterrelateddamageidentifieationindieators15reeeivingmoreandmoreattention.TheaecuracyofstrainrelateddamageidentifleationindieatorsdePendsontheaceuratemeasurementofstrainfieldindamagedstrueturebystrain

5、trandueers，whiehwouldbetrivialandineffieientbytraditionaleleetriestraintransdueers.Withtheadvantagesofmicrosize，lightweight，anti一eleetromagnetisminterfereneeandwavelengthdivisionmultiPlexing，fiberbragggratingsensor15aexe

6、ePtionalchoieefstrainfieldmeasurementofmeehaniealstruetures.Inthiswork，adamageidentifleationmethodeombinedFibersensingwithstraind戶amieindexwasProPosed，themaincontentfollowBraggGratingofthework15asThederivationofstrainmod

7、ewasaehievedbydifferentmethods.ThetestmethodsandeharaeteristiesofstrainmodeandstrainfrequeneyresPonsefunetionweresummarized.FourdamageidentifieationindieatorsresPeetivelybasedonstrainmode，strainfrequencyresPonsefunetion，

8、eurvaturemodeandstrainenergywereanalysedeomParatively.StrainmodevariationrateandstrainfrequeneyresPonsefunetionindexwereehosenfverifieationstudy.ForfiniteelementanalysisofcomersfixedsuPPortedPlatestrueture，Parameterssueh

9、asdisPlacementx刀odel，elenlentstiffllessmatrix，elementnlassmatrixandStraintransitiollmatrixwereealeulated.Stralllnlodalvariationrate一basedidentifieatiollofrhiekness一redueeddamagewassimulatedbyfiniteelementmethodusingMATLA