渦流探傷在鐵路設(shè)施裂紋檢測中的研究與應(yīng)用.pdf

1、武漢理工大學(xué)碩士學(xué)位論文渦流探傷在鐵路設(shè)施裂紋檢測中的研究與應(yīng)用姓名：程松波申請學(xué)位級別：碩士專業(yè)：機(jī)械電子工程指導(dǎo)教師：郭順生20060201武漢理]：大學(xué)碩士學(xué)位論文AbstractTherailwaytransportationhasthevitalsignificancetothenationaleconomydevelopmentDuringtheimprovementoftherailwaytransportationabi

2、lityandspeedinguptherailroadspeed，wemustsafeguardtherailwaytransportationsafeoperationCrackandtheweldedjointflawisoneofbreakdownswhichoftenoccursintherailroadequipmentparts，shouldusetheadvancedtechnicalmethodandcarryonhi

3、ghlyeffectiveandthereliableexaminationtoit，achievepreventionfromaccidentsbeforetheyoccurTheeddycurrenttestingisoneoffivenormalNon—destructivetestingmethodsIncomparisonwiththeothers，itiseasilytoimplementcantestinhigherspe

4、ed，isextremelysensitivetothesurfaceandthenearsurfacedefect，aswellasneedsnotremovethesuperficialcoating，andsoon，thereforeitisspeciallysuitstodetectthedefectsofpartsunderthebadworkingconditionsConsideringproblemoftherailwa

5、ycrackf1aw，theeddycurrenttestingmethodforcrackdefectisresearchedinthepaperFirstlyseveralmethodoftestingcrackdefectareputforwardandcomparedConsideringofconfigurationandusingcharacteristiccrack，wegettheresultthatthecrackde

6、fectcanbeonlydetectedbyportabletestinginstrumentSecondlytheprincipleofeddycurrenttestisintroducedBasedonelectromagneticfieldtheorysomeimportantformulasarededuced。Impedanceanalyticalmethodispresented，throughwhichweanalyze

7、somefactorsthataltertestingcoilimpedance’svalueThen，characteristicfrequencyoflaidtestcoiliscalculated，itisimportanttoselectthetestfrequencyAsforthesensordesign，asensorwithhi【ghperformanceisdesignedthroughmodificationbase

8、donsomesensorswitllbetterperformanceVariousfactorsthatinfluencethesensorperformanceareanalyzedthroughexperimenttooptimizethesizeofcoilFinallyusedtheorthogonalexperimentdesignmethod，wedesignatedtheparameterswithreasonable

9、combination，andcompletedthedesignofsensorsystemAsforhardwaredesign，insignalconverter’inordertoimprovethesensitivitytheparameterofsignalconverterisgottenthoughmathillationexcitationcircuit，signalconvertercircuit，singlechi