（PHD）Finite element modeling of ultrasonic piezoelectric transducers.pdf

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1、FiniteElementModelingofUltrasonicPiezoelectricTransducersInfluenceofgeometryandmaterialparametersonvibration,responsefunctionsandradiatedfieldbyJanKocbachUniversityofBergenDepartmentofPhysicsSeptember2000PrefaceThisworkistheresultofadr.scient.projectwithadurationof

2、threeyearsfinancedbytheNorwegianResearchCouncil.TheprojecthasbeenhostedbytheDepartmentofPhysicsattheUniversityofBergen(UoB)andChristianMichelsenResearchAS(CMR),withAss.Prof.MagneVestrheim(UoB)andDr.PerLunde(CMR)assupervisors.Firstofall,Iwouldliketothankmysuperviso

3、rsDr.PerLundeandAss.Prof.MagneVestrheimfortheirguidancethroughoutthecourseofthiswork.IwouldalsoliketothankProf.Dr.HalvorHobækandProf.Dr.LadislavKocbachforvaluablehelpandusefuldiscussions.AspecialthankisdirectedtothestaffattheInstituteofMeasurementTechnologyattheJ

4、ohannesKeplerUniversityofLinz(nowwiththeFriedrich-AlexanderUniversityofErlangen-N¨urnberg),andespeciallyProf.Dr.-Ing.ReinhardLerchandDr.-Ing.ManfredKaltenbacher,forprovidingaverystimulatingatmosphereandinsightfuldiscussionsduringmystayattheinstitute.Iwouldalsolik

5、etothankthesamepeoplefortheabilitytousethefiniteelementcodeCAPAbothduringandaftermystayattheinstitute.Dr.PerLunde,Dr.ØyvindNesse,ToreMagneSkarandErlendBjørndalarealsohighlyacknowledgedforprovidingsomeofthemeasurementdatawhichhavebeenusedforcomparisonswithfiniteelem

6、entsimulationsinthiswork.Inaddition,IwouldliketothankDr.NingqunGuoforprovidingdetailsabouthisfiniteelementsimulations,andProf.Dr.JeremyAstleyforsomevaluableadviceregardingtheuseofinfiniteelements.IwouldalsoliketodirectaspecialthanktomydearTonjeandtomymotherBjørgfor

7、theirsupportandhelpduringthiswork.ThisworkhasreceivedsupportfromtheNorwegianSupercomputingCommitteethroughagrantofcomputingtime,makingitpossibletomakesimulationswiththefiniteelementcodesABAQUSandANSYS.***Duringthiswork,anumberofinteractivefiguresandanimationshavebe

8、enmadeusingthedevelopedsimulationtoolFEMP.Thesehavebeenanimportantsupplementintheinterpretationoftheanalysisresults.Forconvenienceofthereader,someoftheseintera