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1、WHITEPAPERFundamentalsofResonantAcousticMethodNDTGailRStultzgstultz@modalshop.comRichardWBonorbono@modalshop.comMarkISchiefermschiefer@modalshop.comTheModalShop,Inc.3149EastKemperRd.Cincinnati,OH45241©2005TheModalShop,Inc.AbstractRapidconversionofmachinedpartstopowderedmetalandc
2、astisdrivingindustries,especiallyautomotive.Duetothehighexpectationsofbothprimarymanufacturersandendconsumers,defectscannotbetoleratedeveninmillionpiecequantities.Thereis,ineffect,agrowingrequirementforzerodefectsupplychaincommitments.Toachievezerodefectoutput,manufacturersarema
3、kingthecommitmenttomovetoonlineNDT.Thistypeofonlineinspectionrequiresaccuracy,reliability,andhighthroughput.ResonantAcousticMethodNDT(NDT-TMRAM)providesaproventechniqueexhibitingthesepivotalperformancerequirementsandautomateseconomically.NDT-RAMtests,reportsandscreensformostcomm
4、onpartflawsinamannersimilartothewayNASAtestsflighthardwareandautomotivemanufacturersvalidatetheirnewcardesigns.Utilizingstructuraldynamicsandstatisticalvariation,NDT-RAMprovidesmature,laboratoryproventechnologyinarobust,economical,process-friendlymanner.1.MotivationalExampleAswi
5、thmostpowderedmetalcomponentsuppliers,CompanyABCisalreadydoingspotmagneticparticletestingonbatchesofpartsfromagivenproductionrun.Theproblemstartswhenacustomer,sayanautomotivemanufacturer,experiencesfieldfailures.TheresultisthatCompanyABCisputonparts-holdandhastopayforbothcontain
6、mentand100%fieldinspectiononthecustomersite.Attheriskofpermanentlydamagingthecompany’sreputationandlosingbothexistingandnewbusiness,significantlylargerpartbatchesaresubjectedtomagneticparticleinspection,with100%oftheproductionlotsinspectedviaa300%visualpartsort–whereeachpartisvi
7、suallyinspectedbythreeseparatetechnicians.EveryonewhocanbePage1of11WHITEPAPERpulledfromanotherjobispulledintohelpoutduringthistimeofcrisis.Toensurenecessaryquality,100%end-of-linepartinspectionmustbeimplemented;traditionalNDTtechniquessuchasmagneticparticle,liquidpenetrant,eddyc
8、urrentandX-ray,orpurelyvisualinspection,arepain
