热喷涂涂层厚度的超声无损检测方法研究(3)
发布时间:2021-06-05
发布时间:2021-06-05
无勋检测
ABSTRACT
ABSTRACT
thethicknessofthermalsprayingcoatedlayeris
qualityevaluation,andis
anaUltrasonicmeasuringonononeofthehotspotintheresearchSotheresearchondifficultyinultrasonicNDT.onultrasonicNDTmethodhasimportanteffectthethicknessof
thermalsprayingcoatedlayer.Inthepresentwork,theadvanceddigitalsignalprocessing(DSP)technology
beenwhichisthewavelettransformmodulusmaximahaswhichappliedtothetransformandprocessingoftime—domainsignalsacquired
fromfromultrasonicnon—destructivetesting,thepurposeistofinduseful
theultrasonicsignalswhichcaninformation
theshowthethicknessofcoatedonlayer.Thus,theapplicabilityandaccuracyofultrasonicnon-destructivetestingthicknessof
coatedlayercanbevalued.Intheproject,surfacecoatedlayersofthermalsprayingsamplehavebeenstudied.
Thispaperfirstlyestablishedultrasonicecho
characteristicinformationismodule,andbasedonthismoduleanalyzedwhichisconnectedthethicknessofcoatedlayer,andthisinformationisthetimewhichreflectionechoisinceptedbydetectorfromthe
ofwavelet
waveletinterfaceofcoatedlayerandbasalbody.Basedongoodperformance
oftransformintime—frequencydomainandsignalsingularitydetecting,transformmaximamethodwasaccessed
excavatedtheuseful
wavelettoprocessthesignalscoatedcoatedlayegtheninformationonthethicknessoflayerinthefigureofofcoatedlayentransformmodulusmaxima,and
onthencalculatedthethicknessTheresult
principlethethicknessofepoxylayerwithultrasonicNDTmethodshowsthatthewaveletoftransformmodulusmaximamethod
signals,andthe
coatedisapplicableinthesingularitydetectionofthecoatedlayersingularitycorrespondedtolayer
onthetimeultrasonicarrivedontheinterfaceofandbasalbody.Andultrasonicnon—destructivetestingmethodisapplicable
layer.thethicknessofcoated.
IntheresearchofultrasonicNDTmethodonthethicknessofcoatedlayer,the
sampleofA1coatedlayer,SAMandHAcoatedlayerweredetected.A—signalwas
directedcontacting,andcharacteristicinformationwaspickuponwavelet
transformmodulusmaximamethodbyMexhwavelet.TheresultsonthethicknessofpickupbyA1,SAMandHAcoatedlayerwithultrasonicNDTmethodshowedthatthevalueof
anultrasonicmeasuringhas
relativeerrorisintheagreementwiththatonmetallographicalmethod.Andtherangeof1%一16%.
onAgainsttheaccuracyofultrasonicnon—destructivetestingthethicknessof
coatedlayer,experimentalinvestigationwasproceededinfourmajorinfluencingIII