应用模态声发射进行自动源识别

3SteveZiole33(,100055),,,AUTOMATEDSOURCEIDENTIFICATIONUSINGMODALACOUSTICEMISSIONLiuJingChenJimao3SteveZiole33(CapgoldDevelopmentInc.,BeijingOffice)AbstractFatiguecrackgrowthinastructurehasbecomeaconcerntotheprolongingofitslifetime.Modalacousticemission(MAE)thatusestheenergyproducedbythegrowingcrackfordetectionwithoutscanninghasshownitsconspicuousadvantage.MAEcanresultinthecaptureofthousandsofwaveformsduringatest,ofwhichonlyafewwillbethesignalsfromcrackgrowth.Soseveraldigitalsignalprocessingapproachesforthesignalsarediscussedandtheapplicationresultsoftheroutinesaregiven.KeywordsAcousticemissiontestingAutomatedidentificationSignalprocessingFatiguecrack,,B252B2521954,,,,2024,,,,,,,,,,,333DigitalWaveCorporation,USA,,,,120kHz3MHz,60dB2564096,28,,(,,),,,,,0822220002NDTVol.22No.2Feb.2000©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,(),,,,,,,,,,22.1,,(;,),ö(AöD)1ab(a)(b)1,,,,,,,50%90%[1]()(E)(F),,,22,,,,,,,33223218:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.()2.22,(DFT)(PSD),41,,42.322[2],,[3],,,,,(STFT),,(Wavelet)2(Wingner2Ville),,,,,,STFT,,(0.3mmPentel2H)(5)STFT,53.2mm(1ö8in)STFT16(64),643ö4,64512100800kHz10242048,,2700kHz256,,22,STFTWigner2Ville,,,STFT,STFT22,2,[4],,,67,6,;7,628:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.773,,(),,,152mm(6in),3.2mm(1ö8in),,;,,,8,(),,[5]8(a)(b)4,,,,1SearleI,ZiolaS,RutherfordP.Crackdetectioninlap2jointsusingacousticemission.SPIEProceedingsonSmartStructuresandMaterials(Vol.2444),SanDiego,California:1995.212-2232GormanMR.Platewaveacousticemission.JournaloftheAcousticalSocietyofAmerica,1991,90(1):358-3643GormanMR,ProsserWH.AEsourceorientationbyplatewaveanalysis.JournalofAcousticEmission,1990,9(4):283-2884MichaelFeldman.Non2linearsystemvibrationanalysisusinghiberttransformÉfreevibrationanalysismethod(FREEVIB).MechanicalSystemsandSignalProcessing,1994,8(2):119-1275,..,1998(5):17-19,27:1999208209(76)mm0.10.050.100.50.200.300.40.150.25,,,,,,,,:199920120638:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.