壓電陶瓷傳感器力學(xué)模型理論與試驗研究

1、沈陽建筑大學(xué)碩士學(xué)位論文壓電陶瓷傳感器力學(xué)模型理論與試驗研究姓名：梁麗娉申請學(xué)位級別：碩士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：閻石201101碩士研究生學(xué)位論文AbstractIIIAbstractAvarietyoflargecomplexengineeringstructureshavebeendevelopingstructuralhealthmoniting(SHM)technologyhasbeenbecominganacademicre

2、searchfocuswiththeeconomicdevelopinginChina.Overthelastdecadessomesmartmaterialswhicharetypicallyrepresentedbypiezoelectricceramicsmaterial(suchasLeadZirconateTitanatePZT)havepredominantpropertiesofdualfunctionofsensinga

3、ctuating.ThesensmadebyuseofthesensingfunctionofthePZThasbeenwidelyusedinthefieldofstructuraldamagedetectionhealthmoniting.Thesenshasadvantagesoffastresponsegoodlinearitylowenergyconsumptionlowcosteasymanufacturing.Howeve

4、ritisdifficulttopreciselytaketheeticalanalysisinpracticalapplicationespeciallyinhealthmonitingofconcretestructuresduetocomplexboundaryconditionsofPZTpatchthecomplicatedstresssituation.Atpresentitisbelievedthatthepressure

5、appliedonthesurfaceofthePZTpatchhaslinearrelationshipwiththeoutputvoltageofthesignalwhichisnotconsideringtheimpactofthelayerthicknesshasthedeferencewithactualsituation.Thepurposeoftheresearchistoestablishamechanicalmodel

6、fthePZTsenstakeaparameteranalysisexperimentalvalidationbasedontheabovebackground.TakingthePZTcrystalthepastedtypetheembeddedtypesenssasthemainresearchsubjectsrespectivelythepaperpresentsamethodtosetupthemechanicalmodelby

7、useofthepiezoelectricequationthevibrationequation.BasedontheproposedmechanicalmodeltheparameterssuchastheactuatingsignallayerthicknessPZTareaboundaryconditionetalaretheeticallynumericallydevelopedbyingtheappropriateactua

8、tingwaytotheeticallymakethesignalanalysis.Thepaperhascarriedoutthetheeticalanalysistheexperimentalvalidationinseveralaspectsasfollowing:Firstlybasedonthepiezoelectricconstitutiveequationsthepaperestablishesthesimplifiedm

9、echanicalmodelsfthesensbyusingthelumpedmassmethodsetsupthetheeticalexpressionofthepiezoelectriceffectfthePZTsenssolvesthestiffnessofthePZTpatch.Secondlybasedontheproposedtheexpressionoftheelectricgeofthepiezoelectriceffe

10、ctthemechanicalmodelsfboththepastedtypetheembeddedtypePZTsenssaresimplifiedrespectivelythemultiparameterexpressionisestablishedbyconsideringthedampingofthelayerthicknesstheenergydissipationofthecabledeviceswhichisequival

11、entlychangedintosystemdamping.Thentheestablishedsensingmodelisnumericallyanalyzedunderaharmonicloadingtheinfluenceoftheparametersisfurtherclarified.FinallytheexperimentsfthepastedtypeembeddedtypePZTsensswithdeferentthick

12、nessunderaharmonicloadingareconductedtovalidatetheproposedmodels.Theexperimentalresultsarecomparedwiththenumericaloneswiththesameparameterstheymatchwell.Theproposedmechanicalmodelmaylayabasicfoundationfdamagedetectionhea