基于磁致伸縮導(dǎo)波的鋼管無損檢測(cè)實(shí)驗(yàn)研究.pdf

1、華中科技大學(xué)碩士學(xué)位論文基于磁致伸縮導(dǎo)波的鋼管無損檢測(cè)實(shí)驗(yàn)研究姓名：柯巖申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：機(jī)械電子工程指導(dǎo)教師：武新軍康宜華20060422華中科技大學(xué)碩士學(xué)位論文IIAbstractGuidedwavestechnologyhasmuchpotentialityintestingofpipewksfitsadvantagesofhighefficiencylowcostscomparedtotraditionalmethods.

2、Nondestructivetestingofsteeltubesusingmagostrictivedevicewasexperimentallystudied.Anexperimentalsystemprototypewasfirstlydeveloped，whichconsistssensstransmittersreceivers.Apersonalcomputerincooperationwithasinglechipproc

3、esswasusedtoautomatetheexperimentalprocedure.Thesignalgeneratingcircuitisimplementedbygatingthecontinuoussinusoidalwavefseveralcycles.Thesignaltonoiseratiowasimprovedthroughtwomeasuresofconnectingtheelectricalgroundofthe

4、conditioningcircuitstothesteeltubestestedaveragingthedetectedsignal.ThesoftwarebasedontheADlinkcardWindowsoperatingsystemwasdevelopedfdataacquiringrecdingdisplaying.Theexperimentalresultsshowthatthesystemcanbeemployedtol

5、owfrequencymagostrictiveguidedwavetest.Secondlythewavepropagationexperimentsaremadeontwodifferentsteeltubesingoodcondition.Theexcitedwavemodestheirdispersionwereanalyzedbytimetimefrequencydomainsignalprocessingmethods.Ef

6、fectsofdifferentparametersi.e.numberofgatedcyclesdensityofmagicfieldonguidedwavestransmittingareevaluated.Thecombsenscircumferentialarraysensradialsensweredesigneddiscussedwithexperimentalresultstheeticalpredictions.Fina

7、llytwodifferentartificialdefectsofdifferentsizesweremanuallymadedetectedusingL(02)mode.Reflectedsignalsbydefectscanberecognizedfholesof3.5mmindiameternotchesof1.5mmindepthrespectively.Theresultsmayprovidereferencefpracti