基于磁致伸缩超声导波的无损检测系统分析

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1、万方数据浙江大学硕士学位论文AbstractInordertoovercomethedifficultythatitiSnoteasytodonondestruetivetestingwithhighefficiencyandlowcosttosteelpipesbeingusedaroundkindsoffields，thistopiccarriedouttheresearchontheoryandapplicationofmagnetostrictiveultrasonicguidedwavenondest

2、ructivetestingsystem．Thesystemcanbeusedforrapidlyandgloballyinspectingoveralargeareaofastructure．ThemagnetostfictiveultrasonicguidedwavetransducerWasdesignedatfirst，thenthehardwarearchitecturebasedonFPGAandARMprocessorswasdisplayed．Thetestresultinasteelpipew

3、ith76mmdiametersindicatedthatthesystemcoulddetect1％corrosionofthecrosssection．Inthefirstchapterofthepaper,thefactthatsteelpipeWasusedinlargeareaandthedetectingmethodwereintroducedfirstly，thenreviewofultrasonicguidedwaveresearchingWasdiscussed．Basedoncomparin

4、gofseveralultrasonicguidedwaveNDTsystemavailablecommercially，thesignificanceandresearchaimofthistopicWasmoreclear．Finally,theresearchcontentofthistopicWasproposed，it’SveryusefulforthelaterresearchWOrk．Thesecondchapterstudiedtheequationofmotioninelasticsolids

5、withisotropicproperties，andthenbydiscussingtheguidedwavemodeanddisperseofhollowsteelpipemodel，it’SindicatedthattorsionalmodeT(0，1)Wasnotdisperse，thendesignedamagetostrictivetransducerwhichcouldbeusedforwavedirectioncontrolcombined谢thsignalprocessing．Intheend

6、．experimentdataWasshowedUStodeterminetheshorttimefouriertransformationwasUSefulinultrasonicguidedwavesignalprocess．Thethreechapterdesignedmagnetostrictiveultrasonicguidedwavenondestructivetestingsystemchartwhichmainlyincludedmagnetostrictivetorsionalultrason

7、icguidedwavetransducer,embeddedhumanmachineinterface．embeddedcontr01module，signalsourcemodule，poweramplifiermodule，signalamplifiermodule，signalfilter,ADconverter．Italsodesignedhardwaresystemchartandseveralimportanthardwaremodulewereanalyzedindetail，suchasLi．

8、Ionbatterymanagement，signalfilter,ADCandDAC，wirelesscommunication&positioningmodule．Finally,itanalyzedsomepointsinsignalintegritydesigning．Inthefourthchapter,thecharacteristicincludingspurproper