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1、基于电磁的裂缝检测课程论文院系物理与电子工程学院专业电子信息工程班级学生姓名学号任课教师2013年12月24日BASEDONMAGNETICCRACKDETECTIONAbstract:Thispapersummarizedrecentdiagnosismethodsofmarinedieselcrankshaftcrackandintroducedthefundamentalprinciple,developmentandapplicationofmetalmagneticmemorytesting(MMMT)diagnosistechn
2、ology.Comparedwithothermethods,aschemedevelopedfromMMMTcombinedwithtorsionalsignaltomakeon-linediagnosisofcrankshaftcrackwasproposed,andtheon-linediagnosisexperimentalplatformofdieselwasdesigned.Finally,commentswerealsomadeontheon-lineMMMTmethod.Keywords:marinediesel;crank
3、shaft;crack;metalmagneticmemory1IntroductionMostofthecrankshaftcracksonoceanmarinedieselaredeeplylatentanddifficulttodetectartificially.Ingeneral,whilethecrackdevelopstoacertainextentitwillruptureandcausedestructivebreakage1.Ifinchoatestressconcentrationandtinycrackofcrank
4、shaftaredetectedon-linebyNon-DestructiveTesting(NDT)methods,thedieselcanbestoppedbeforethefulldevelopmentofthecrackandthusrupturecanbeavoided.AnewNDTmethod,MMMTdevelopedrapidlyrecentyearswithadvantagesinsuchareasascheapandsimplesensors,measuringwithoutimpactingdieseloperat
5、ionandlong-termon-linedetection.Therefore,therewillbeagreatforegroundtouseMMMTincrankshaftcrackdetection.2MaterialsandMethods2.1StaticDiagnosisofCrankshaftCrackCrankshaftcrackisoneofthefatalfaultsindiesels.TherearesomestaticNDTmethodstodiagnosecrankshaftcrack2suchasUltraso
6、nicTesting,RadiographicTesting,MagneticParticleTesting,PenetrateTesting,EddyCurrentTesting,OpticalHolography,andMicrowaveTesting.Thesemethodshavetakenanimportantpartincrankshaftqualitycontrolandaccidentprevention.However,ontheotherhandthereareseveraldisadvantagesofthesemet
7、hods.Firstly,allofthemmustfindcracksalreadyformedandcannotdetectunexpectedones.Secondly,theyareunabletomakeon-linedetectionandfaultdiagnosis.Thirdly,mostofthemneedsurfacepretreatmentofthefacilitiesbeforeinspection.Finally,theaccuracyofdetectionisaffectedbycrankshaftconfigu
8、rationandpersonalskill.2.2DynamicDiagnosisofCrankshaftCrackAtpresenttherearesomemethodsto
