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ID:36464176
大小:2.79 MB
页数:114页
时间:2019-05-10
《漏磁检测若干关键技术的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、中国科学技术大学博士学位论文漏磁检测若干关键技术的研究姓名:张勇申请学位级别:博士专业:信号与信息处理指导教师:叶中付20070401中田科学技术大学博士学位论文际应用意义。然后,本文总结了磁偶极子应用在漏磁场分析中的研究成果,提出了一种利用漏磁信号分步重构缺陷形状的方法,并对半圆形、三角形、矩形这三种常见的缺陷形状举例进行说明。以上三个例子可以说明,本文提出的逐次逼近法重构缺陷的形状取得了较好的效果,与其它方法相比,有计算量小,重构方法简单的优点。在本文最后针对目前漏磁检测的研究现状,提出了进一步的研究方向。关键词:无损检测,漏磁检测,干扰抵消,信道均
2、衡,磁偶极子,缺陷重构中胃科学技术大学博士学位论文Abstr,dResearchonsomeKeyTechnologiesofMFLInspectionAbstractBased011thefactthatsomephysicquantumwouldbechangedbecauseofexistingdefects.nondestructivetestingoqna3coulddefectthedefects.NDTplaysaimportantroleofqualitycontrollingandsavinglaWmaterialsandimprove
3、productivityinindustrymanufacture.NDTisalsoaimportantinspectionmeansfortheequipment.Asoneofthemostimportant,fastestandcheapestnondesmlctivetestingmethods,Magneticfluxleakagetechnologycouldbeappliedininspectionferromagneticmaterials.MFLisalsothemostcommoIllyusedinnondestructivetes
4、tinganditcouldfindthemajorityofdiscontinuities.Themainresearchcontentsinthispaperinclude:First,theundetectableareainseamlesspipelineQipelineheaas)isusuallyinspectedbymagneticparticles,butmagneticparticlesmerelyinspectthedefectnearpipelines’outersurfaec.Theparticleindicationofdefe
5、ctsisusuallyobservedbyeye,andSOthetestingreliabilityhasahigllhunmafactorinfluencedependingontheoperator.Forthereasonofequipmentitself,MFLinspectionequipmentcouldn’timpemthepipelineheads。whicharcregardedasanundetectablea嘲inMFLexamination.Inthispaperweattempttou∞anewmethodbasedOilM
6、FLt0inspectpipelineheads.Weintroducetheideaofleadingpipeline,andexpatiatethemethodofseparatingtheMFLsignalofdefectnoarpipelineheads.Thedifferencebetweenreferencesignalandartificialflawsignalcanbeextractedproperlybyusingcorrelationcanceling.TheexperimentsshowthatitispossibleforMFL
7、technologytoinspectthetubehead,andimprovetheinspectionefficiency.Then,influencedbythelift—offvaluebetweenthepipelineandcoilSenSOrS,thevariouspropertiesofdeetroniccomponentandthedifferentlocationofcoilsensor,iii中田科学技术大学博士学位论文Abstracttheoutputsi萨aI’samplitudeandphaseofeachchannelar
8、edifferentdespitethesalYleflawinMFLinspe
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