超声波探伤英文资料.docx

超声波探伤英文资料.docx

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超声波探伤英文资料

Ultrasonicflawdetection

Ultrasoundisamechanicalwave,mechanicalvibrationsandfluctuationsinthephysicalbasisofultrasonictesting.Reciprocatingcyclicmovementofanobjectalongastraightlineorcurveinanearequilibriumposition,knownasthemechanicalvibration.Propagationofvibration,knownasvolatility.Fluctuationsintomechanicalwavesandelectromagneticwavestwocategories.Mechanicalwavepropagationofmechanicalvibrationsinanelasticmedium.Theultrasoundisamechanicalwave.

Themainparametersofthemechanicalwavewavelength,frequencyandwavevelocity.Wavelength:

thedistancebetweenthesametwoadjacentoscillationphaseofthesamewavelineparticleknownasthewavelength,sourceormedium,anyoneparticletocompleteafullvibrationwavejustforwardawavelengthdistance,commonlyusedinmeters（m）;frequencyf:

fluctuationsintheprocess,heservedasagivenpointinonesecond,adoptedbythenumberofcompletewaveiscalledfrequency,commonlyusedinunitsofhertz（Hz）;wavevelocityC:

fluctuationsinthewaveperunittimetransmittedthedistanceiscalledthewavevelocity,thecommonunitsofmeters/second（m/s）.

Wavelengthandwavevelocityisproportionaltoandinverselyproportionaltofrequency;whenthefrequencyisfixed,thewavevelocitythegreaterthewavelengththemorelong;wavevelocitywhenthefrequencylower,themorelongwavelengthavailablebytheabovedefinition:

C=*f.

Sub-sonic,sonicandultrasonicmechanicalwavepropagationinanelasticmedium,thepropagationvelocityinthesamemedium.Theirdifferencemainlyduetodifferentfrequencies.Frequencybetween20~20000Hzcancausepeopletohearingthemechanicalwaveiscalledsoundwavesatfrequenciesbelow20Hzmechanicalwavesknownasinfrasonic,frequenciesabove20000Hzofmechanicalwavescalledultrasound.Infrasonic,ultrasoundcannotbeheard.Thefrequencyoftheultrasonicflawdetectionisgenerallybetween0.5~10MHz,theinspectionofsteelandothermetalmaterials,commonlyusedfrequencyfor1~5MHz.Ultrasonicwavelengthisveryshort,whichdeterminestheultrasoundhasanumberofimportantfeatures,sothatitcanbewidelyusedfornondestructivetesting.

Gooddirection:

（1）Ultrasoundishighfrequency,veryshortwavelengthmechanicalwave,thewavelengthusedinthenondestructivetestingofmillimeter;ultrasoundlikelightwaveshasagooddirectioncanbedirectedemission,easytobefoundinthematerialwasseizeddefects.

（2）Highenergy:

energy（sound）andisproportionaltothesquareoffrequency,ultrasonicenergyismuchlargerthantheenergyofordinarysoundwaves.

（3）Intheinterfacereflection,refractionandwaveconversion:

ultrasoniconsomeofthefeaturesofthegeometricalacoustics,suchasastraightlineinthemedium,thecaseofinterfacereflection,refractionandwaveconversion.

（4）Penetratingpower:

whentheultrasonicwavepropagationinmostmedia,thedisseminationofenergylossissmall,thepropagationdistance,abilitytopenetrateitsabilitytopenetrateuptoseveralmetersinsomemetallicmaterials.

Ultrasonicflawdetectoristhefrequencyabove20kHz,beyondthepeopleearstodistinguishbetweentalentedandpenetratingastrongsoundwaves.Isaportableindustrialnon-destructiveflawdetector,itcanbetoofast,convenient,nodamagetotheworkpieceinternalvarietyofdefects（welds,cracks,folding,loosesandholes,pores,adulterated,etc.）,detect,locate,evaluateanddiagnostics.Bothcanbeusedtocarryouttheroom,canalsobeusedfortheprojectsite.Commonlyusedinboilers,pressurevessels,aerospace,aviation,electricpower,petroleum,chemicalindustry,offshoreoilpipeline,military,shipbuilding,automobiles,machinerymanufacturing,metallurgy,metalprocessingindustries,steelstructures,railtransport,nuclearpower,universityandotherindustries.

Ultrasonicflawdetectorreason:

theuseofultrasonicreflectiontruthnondestructivedetectiononthedefectsinthedata,whentheultrasoundtoconveytheinformationtobedetected,dataacousticcharacteristicsandtheinternalorganizationoftheinevitableimpactofchangesonultrasoniccommunication,throughultrasoundbyaffectthelevelandcircumstancesofthedetectionsurveydatafeaturesandskillsofthetectonicshiftknownasultrasonictesting.ColorultrasonicflawdetectorLEDdisplayiscolorful,multi-colorselection,orthepremiseofdivergentlight,backlightcontinuationadjustable,moreintuitivetosee.Therearemanyabouttheuseoftheultrasonicflawdetector,forexample,thereflectionofultrasoundtomeasuretheinterval,theapplicationofhigh-powerultrasonicvibrationtoeliminatethescaleattachedtotheboilerabove,theapplicationofhigh-energyultrasoundmadethe"harmonicscalpel"togetridofcrushingthehumanbodycancer,stones,etc.Theeffectandthepenetratingpoweroftheultrasonicflawdetector,thereflectionoftheapplicationofultrasoundcanbeastraightlinetoconveythecharacteristicsofthedetectionisagreatuseofareas.Ultrasonicflawdetectionusingthedetectionofprimarycovervarioustypesofinformationintheindustrialandmedicaltestinganddiagnosisonthehumanbody,afterwhichonecandetectmetalsandotherindustrialinformation,thereisnobubble,scars,cracksandotherdefectscanbedetectedcannormalpeoplethebody'ssofttissue,bloodflow.

Peopleishowthesampleapplicationofultrasoundtodetect?

Ultrasonicflawdetectoriscurrentlymortalisthemeasuredobject（forexample,industrialinformation,thehumanbody）emissionultrasound,andthenapplythereflection,Dopplereffect,transmissiontoobtaintheinformationinsidethemeasuredobjectandformimagesthroughthedisposal.Ultrasonicflawdetector,theDopplereffectmethodistheapplicationofultrasoundintheattacktoencountertheobjectofactivitiesoftheDopplershifteffecttodrawthecharacteristicsoftheactivitiesoftheobjectsbiasandspeed;transmissionruleisparsedultrasoundtopenetratethroughmeasuredobjectafterthetransformationtoderivetheinternalfeaturesofobjects,theiruseinthedevelopmentstage;ultrasonicflawdetector,thefirstintroductionsisthewaytothemostfrequentlyusedreflectionmethodtoobtainthecharacteristicinformationoftheobjectinterior.Thereflectionmethodisbasedonultrasoundtaskaftertheonsetofstrongreflectionofthedifferencesbetweentheacousticimpedanceoftissueinterfacereason,asweknow,soundwavesfromonemediumtoconveytoamediumofhoursoftheinterfacebetweenthetwowillbeattheonsetofreflection,andthegreaterthedifferencebetweenthemediareflectedthegreaterwillbe,sowecanlaunchanobjectpenetratingpower,ultrasoundcanbeastraightlinetoconveytheultrasonicflawdetectorandthereflectedultrasonicacceptedandthistissuecontainsvarioustypesofmediabigandsmallcanbedeterminedbasedonthestatusofthereflectedultrasoundhasamplitudeultrasoundhasspreadstatusandavarietyofmediacfthedifferenceinthelevelofinformation（areflectionbackreflectsthereflectiveinterfacefromthedetectionoftheappearanceoftheinterval,themagnitudemayreflectthemediabigandsmall,mutatismutandis,tothedifferencesinlevelandothercharacteristics）,ultrasonicflawdetectorandthendiscriminantofthemeasuredobjectcanhaveabnormal.Theoccurrenceoftouchtoagoodmanyinthisprocess,includingultrasound,acceptedflagssignaloftrafficlightsanddisposal.Oneoftheultrasonicapproachistoencourageelectricflagslightsafterthecircuitispassedtothepiezoelectriceffectofcrystal（cristobalite,sulfuricacid,lithium,etc.）,sothatthevibrationandultrasonic;buttoacceptthereflectedultrasoundaftermidnight,thispressurethetransistorwasthepressureofthereflectedsoundwaveswilloccurelectricflagslightsandsendaseriesofdisposaltothedisposalofflagslightscircuit,ultrasonicflawdetectorconstitutethefinalimageforpeopletolookatdiscrimination.

Herebasedontheimagedisposalmethods（thatistogettheflagslightsconvertedtoimagesinwhatway）thespeciescanbedividedintoA-typeshows,M-typetypeB,typeC,F-typedisplay.A-typedisplayisoneoftheultrasoundflagswillbeacceptedlightsdisposalintoawaveformimagebasedontheshapeofthewaveformcanbeseenthatthemeasuredobjectwhichcanhaveanomaliesanddeficienciesintheside,howmuch,ultrasonicflawdetectorfirstusedtoindustrialinspection;theM-typedisplayistheonethroughthedetectionofluminancedisposalaccordingtoworkonebyoneopenedconstituteaone-dimensional"spacemulti-eventtimingdiagram",suitabletolookattheinternalactiveformobjects,ultrasonicflawdetector,suchasactivitiesorgans,arteries,etc.TypeBshowsalotthroughthedetectionofluminancedisposalgroupconsistingoftwo-dimensionalside-by-side,whichreflectstheobject'sinternalfaultsectionoftheanatomicalimages（diseasebackyarduseBsuperthisisthereasontodoit）,ultrasonicflawdetectorissuitabletolookinternallyatstaticobjects;C-typeF-typedisplaywithunmatchedless.Ultrasonicflawdetectionwillnotbeveryprecise,andmoreconvenientcomparedwithotherdetectionmethods,fast,norwillitdetectobjectsandoperatorrisk,sowerethepeoplemoreandmorethroughoutthefarewell,hasaverybroadcarriedoutprospects.

Thedevelopmentofultrasoundandintheoverhaulofthestate

Abstract:

Inthevarioustypesofpowerplantequipmentmaintenance,servicelifeassessment,themostfrequentandwidelyusedinultrasonictestingtechnology.Ultrasonicflawdetectio