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1、华中科技大学博士学位论文水冷壁管机械化无损检测方法与装备姓名：宋小春申请学位级别：博士专业：机械制造及其自动化指导教师：康宜华;武新军20050617AbstractInthestrainedcircumstanceofthecurrentelectricitysupply,asabigdoorofpowersupply,thethermalpowerplantannuallyprovidesabout63%electricitythatthewholenationusedeveryyear.However,bec
2、auseofthepoormanufacturingquantityandtheunscientificmanagement,thesafetyandcost-effectiveofthethermalpowerplantisinfluencedseriouslybythetubeexplosionandleakage.Inordertodecreaseandpreventtheincidentshappening，andtoimprovetheboilertubeinspectionquality，itisver
3、yimportantforustosearchforanquantitativeinspectionmethodanddevelopaneffectiveapparatusfortestingboilertube.Inthelightofthestatusthatthereexistsfaultsinwater-walltubeandtherearenoeffectiveinspectionandevaluationmeans,inthisdissertation,anovelfusiontestingmethod
4、usingthemainmagneticflux(MMF)techniqueandultrasonicmethodisstudied,andanautomatictestingdeviceisdeveloped.Themainresearchcontents,resultsandnewideasareasfollows:First,accordingtothespotinspectionenvironmentoftheerectingwater-wall,awater-wallinspectionapparatus
5、,whichincludestheadhesionandcrawlingmechanismandsafety，themagnetictransducer，afixerforultrasonicprobe,remotedataacquisition,thecontrolsystemandthesignalprocessingsoftware,isdesigned.Comparingwithotherinspectionmethodsforwater-walltube,thissystemnotonlyhavethef
6、astexaminationspeedandhighsensitivity,butalsocanrealizeautomaticexaminationandquantitativeevaluation.Anditcanincreasetheexaminationefficiencyandthereliability,guaranteetheboilerforthethermalpowerplantrunningsafelyandcost-effectively,andhaveconsiderableeconomic
7、benefitandtheextensivemarketappliedforeground.Second,becauseofthedifferentcharacteristicsofthelocaldefect,systemnoise,theinsidescrewthreadandthewalllosscorrosionsignal,asignalpre-processingmethodbasedonwaveletanalysisisdiscussed.Thesignalprocessingmethodbasedo
8、nwavelettransformmodulemaximumvalue,thewaveletdecompositionandreconstructiondenoiseandanadaptivewaveletnoisecancellerisusedtocancelthevariousnoises.Andwalllosssignalispickedupfromt
