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1、AbstractTurbinediskisoneofthecorecomponentsofaeroengine,itsqualitydirectlydeterminestheaircraft’soperationsecurity.Withthecontinuousimprovementofaircraftperformance,thequalitycontroloftheturbinediskhasalsobecomemoreandmoreprominent.Whiletherearemanymethodstodetecttheturbinedisk,theseconventionalnond
2、estructivetestingtechnologiesarenotsensitivetocertaindefecttypesofturbinedisk.Therefore,anondestructivetestingtechnologybasedongeomagneticfield--micromagneticdetectionwasproposed,todetectthepores,cracks,especiallythekissdefectexistinturbinedisk.ThesuperalloysGH4169turbinediskwasstudiedintheresearch.
3、Firstly,themagnetizationcharacteristicsofthematerialwastested,GH4169wasprovedtobeparamagneticmaterials.Secondly,thesignaldifferencecomparisonmethodcombinedwithlowpassfiltertechnologywasraisedtoeliminateorrestrainthedetectionsignalnoiseaccordingtothecharacteristicsthatthedetectionsignalamplitudeiswea
4、kwhilethenoiseisstrong.Thirdly,aimingattherecognitionofdefectsignal,thesignalrecognitionalgorithmcombinespeaktopeakormagneticfieldgradientwithprobabilitystatisticsmethodwasputforward.Meanwhile,thelocationandquantificationofthedefectwererealized.Fourthly,atwo-dimensionalimagingsoftwareformicromagneti
5、ctestingwascompiledbyusingVB6.0programlanguage.Thevisualizationofdetectionresultswasrealized.Finally,themicromagneticdetectiontechnologyforturbinediskwasprovedtobefeasiblethroughthetestingofthestandardspecimens.Anewmethodandthoughtfordetectionoftheturbinediskwasprovided.Keywords:Turbinedisk,Micromag
6、netictesting,Kissdefect,Defectrecognition,Two-dimensionalimagingII万方数据南昌航空大学硕士学位论文目录目录摘要...................................................................................................................................IAbstract........................................................................
7、...................................................II目录................................................................................................................................III第1章绪论.........
