實心機車車軸探傷系統(tǒng)中超聲聲場的優(yōu)化設(shè)計.pdf

1、西南交通大學(xué)碩士學(xué)位論文實心機車車軸探傷系統(tǒng)中超聲聲場的優(yōu)化設(shè)計姓名：張晶申請學(xué)位級別：碩士專業(yè)：物理電子學(xué)指導(dǎo)教師：王黎201205西南交通大學(xué)碩士研究生學(xué)位論文第1I頁AbstractWiththeupgradeofrailway‘Sspeed，theincreasingloadoftrainsandtheextensionoflocomotivemaintenancedistance，itbecomesallimportantwo

2、rktOdetectsolidaxledefectwiththemethodofultrasonictesting，whichCanensuretraintrafficsafetyThereforeitisallimportantworktochoosesuitableultrasonictransducerinthecurrentsolidaxleflawdetection，whichmustmeettheaccuracyofthet

3、estUltrasonicsoundfieldvisualizationsimulationisthetheoreticalfoundationofprobeselectioninaxleflawdetectionThetransducersoundfield‘SvisualizationsimulationhavebeencompletedinthisthesisWediscussedtherelationshipbetweenult

4、rasonicfieldandtransducerparameters，andtheoptimalphasedarrayparameters，whichissuitabletodetectthesolidaxleopeningscrackdefects，havebeenelectedAtthesametime，thecoveragerateofsoundfieldandthedefectdetectionratearewellimpro

5、vedNumericalanalysismethodisusedforstudyingacousticfielddistributionofultrasonictransducerinthisthesisThemethodofcombinationofpointsourceisusedforderivingthesinglecrystaltransduceracousticradiationpressure’SformulaThenth

6、eaxialsoundpressuredistribution，axiscross—sectionsoundpressuredistributionanddirectivityjcharacterizationhavebeenvisualizationsimulatedAfterwediscussedthesinglecrystalrectangularsoundradiationpressuredistribution，thebeam

7、deflectionandbeamfocusingacousticradiationpressureformulasoflinearphasedarraysoundfieldhavebeenpushedoutbythehuygensprincipleThenthisthesisdiscussedtherelationshipbetweengeometricparametersofthelinearphasedandthesoundfie

8、ld’SdistributionTherelationshipsamongarrayelements，arraylength，arraywidth，arraypitch，beamdeflectionangleandsoundfield’SdistributionhavebeendetailedlydiscussedWiththepurposeofreducingthemainlobewidth，suppressingwidthsidel

9、obeandcuringdownthegratinglobeamplitude，theoptimaltransducersizehasbccnselected，whichmeettheaxledetectionBasedontheprincipleofFresnelapproximate，weestablishedamodel，whichisusedformeasuringechosoundpressureofaflatholedefe