1、南京航空航天大學(xué)博士學(xué)位論文基于含金屬芯壓電纖維與Lamb波的結(jié)構(gòu)健康監(jiān)測技術(shù)研究姓名：劉建申請學(xué)位級(jí)別：博士專業(yè)：儀器科學(xué)與技術(shù)智能監(jiān)測與控制指導(dǎo)教師：裘進(jìn)浩201006基于含金屬芯壓電纖維與Lamb波的結(jié)構(gòu)健康監(jiān)測技術(shù)研究IIAbstractMetalcepiezoelectricfiber(MPF)isoneofthenewtypesofpiezoelectricdevicesusedfsenssactuats.MPFhassma

2、llsizedoesnotaffecttheperfmanceofthestructurewhenbondedonthesurfaceintegratedwithahoststructure.TherefeMPFhasgreatpotentialtobeusedasactuatssenssfstructuralhealthmonitingbasedonLambwave.LambwavesensinggeneratingusingMPFi

3、sproposedtheprincipleofsensinggeneratingusingMPFisresearchedthemodelofLambwavesensingisdeveloped.MeanwhileMPFusingasaLambwavesensisresearchedfstructuralhealthmonitingapplicationinonedimensionaltwodimensionalstucturerespe

4、ctively.Themajcontributionsnovelresearchresultsinthisdissertationaresummarizedasfollows:（1）ThepiezoelectricequationofMPFincylindricalcodinatesystemisdeveloped.BasedonthepiezoelectricequationofMPFthestrainresponsefmulaofM

5、PFbonedonthesurfaceofstructureisderived.ThenthemodelofMPF’sresponsetoLambwavesexcitedbycircularcrestedactuatisderivedverifiedbyexperimentsthecomparativestudyofMPFcircularPZT’sresponsetoLambwaveisperfmedintheendtheresults

6、showthatMPFhasthecapabilityofsensingLambwaves.（2）ThedirectivityofMPF’sresponsetoLambwavesisresearchedusingamplitudewavelettransfmationfactrespectively.TakingA0modeLambwaveasanexamplethesensitivityfactfunctionofMPF’srespo

7、nsetolambwaveexcitedbycircularPZTisderivedtheresultisverifiedbyexperiments.TheresultshowsthatMPFhashighdirectivitytosenseLambwavethedirectivityacterizedbywavelettransfmationfactshowsmeclearincomparisonwithamplitude.（3）Th

8、eprincipleofLambwavegenerationusingMPFisresearchedtheLambwavegenerationsensingsystemwithMPFisthenestablishedverifiedbyexperiments.AtthesametimethedirectivityofLambwavegenerationwithMPFisresearchedbymeansofamptitudewavele

9、ttransfmationfactmethodrespectively.（4）ThechangesofMPF’sresponsetoLambwaveindifferentdamagetype(loadremovableputtydamagehole)isresearchedthentheresponsesensivityofLambwavetodifferentdamageisresearched.TheBPNNissuccessful