基于GMM的低頻大功率井下聲發(fā)生器的應用基礎研究.pdf

1、浙江大學博士學位論文基于GMM的低頻大功率井下聲發(fā)生器的應用基礎研究姓名：李明范申請學位級別：博士專業(yè)：機械制造及其自動化指導教師：程耀東項占琴20060301浙江大學博士學位論文ABSTRACTForthepurposeofenhancingoilrecoveryfromreservoirsunderprimarydepletionthisthesisproposesanewboreholesoundsourcebasedonanex

2、ternal—drivenflextensionalradiatorwhichutilizesboththelowfrequencyhighpowercharacteristicofgiantmagnetostrictiveactuatorandadvantagesofflextensionaltransducerintermsofcompactnessandabilityofradiatingsoundofhighpowerandlo

3、wfrequencyThemaincontributionincludes：1Basedontheseepagemodelofmulti—phasemedium，thepropagationofsoundinreservoirsmediumisstudied。thesystemrequirementandmaindesignparametersofthesoundsourooisdetermined；2Tofulfilltherequi

4、rementofinstallationspaceandoperationsn廿lgtIIonsizeandprestrainoftheactivematerialmd／ordevicethestructureoftheexternaldrivenflextensionalradiatorisdesignedwhosevibrationcharacteristicsfurtherdeterminestheperformancespeci

5、ficationofvibrationsource；3Thegiantmagnetoslricfivematerial(GMM)isselectedtoconstructgiantmagnetostrictiveactuator(GMA)basedondetailedanalysisofactivematerialcharacteristics；Furthermore，afterthedeterminationofoptimumpara

6、meterssetandstructureoftheGMMrodrelatedstudyisconductedonprestrainsetupelectrical／magneticdesigncoolingmethodandmechanicaltransfer；4Usingtheelectricmechanicacousticmodelofthesystemconstructedbasedonappropriatesimplificat

7、ionandboundaryconditionthekeyparameterstothesystemsdynamicperformanceisanalyzedandsimulated；5UtilizingtheexperimentalplatformconstructedandLabviewTMvirtualmachinesoftwaretheperformanceofthesoundgeneratorprototypesystemis

8、studiedagainstthesimulationresults6TheseworklaysthefoundationsforthefurtherresearchofneNvIowfrequancyhighpowerboreholesoundgeneratorandservesasanimportantreferenceforboththeindustrialapplicationofGMManddevelopmentoflowfr