電阻層析成像（ERT）計算機仿真研究.pdf

1、天津大學碩士學位論文電阻層析成像（ERT）計算機仿真研究姓名：孫永進申請學位級別：碩士專業(yè)：電工理論與新技術指導教師：姜常珍2002.1.1天津大學碩士學位論文英文摘要ABSTRACTIntherecentdecades，ElectricalResistanceTomographytechnologyhasbeendevelopingrapidlyandnowhascometothestageofindustrialapplicatio

2、nsItreconstructstheinternalconductivity(orimpedance)profileofanobjectfromboundarymeasurementsofvoltagesandthecorrespondingcurrentfluxesERThasseveraladvantagesoverothertraditionalprocessparametermeasurementtechniques，such

3、asitsnoninvasion，lowcost，lackofradiation，visualizationNowtheapplicationresearchoftheERTtechniquehasbeenconsideredasaresearchfocusallovertheworldTheobjectofthisthesisisgas／liquidtwophaseflow，whichisatypicalandcomplicatedp

4、atternofmultiphaseflowsinthenatureandindustrialprocessesThemeasurementofgasliquidtwo—phaseflowsuchasvelocitiesandsizesandpositionsofthebubbles，patterns，localvoidfractionandflow—rateofthegasandliquid，isaveryimportantinves

5、tigationsubjectThisthesisanalysestheERTdeeplyfromanimportantrespectDataCollectionMethodItcanprovidemoredataandmoreprecisedataandbasicprinciplesforImageReconstructionThefollowingachievementshasbeenachieved：1Asimulatingsof

6、twareofElectricalResistanceTomographyofindustrialprocessingpipes，Ithasmanyfunctionsasfollows：multi—electrodes，differentwidthofelectrode，autofiniteelementmeshofcirculararea，precision—adjustedmesh，F(xiàn)initeElementMethod(FEM)，

7、multi—typeofflowthreekindsofDataCollectionMethod，supportingequipotentiallinesautodrawingandtheintensityofelectricfieldcalculationItusestwoImageReconstructionmethodsOneisLinearBackProjection(LBP)，andanotheroneisImprovedSe

8、nsitivityMatrixMethodThesoftwareCanbedevelopedfurthermore2ManyexperimentsoftheadjacentDataCollectionMethodhasbeendonebythesimulatingsoftware，manynewideasweretested：1)Thedifferenceofconstantvoltagesourceandconstantcurrent

9、sourceinspiringsystemhasbeenfoundLinearBackProjectionmethodhasbeentheoreticallyanalyzedAweightwhichisabout1oftheinspiringelectrode，hassmallinfluenceConstantvoltagesourceinspiringsystemCanbeusedintheindustrialapplications

10、2)CurrentdensityisveryhighneartheinspiringelectrodeWhenagasbubblecomesoutneartheinspiringelectrode，currentdensityvariesgreatlyAmethodispresented，ifagasbubblecomesintheareaneartoanelectrode，andtheinformationisusedinthewei