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

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

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