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1、襄樊学院毕业设计(论文)英文翻译题目超声波简介及其应用专业机械设计制造及其自动化班级机制0712姓名刘康学号指导教师职称李梅副教授2011年5月25日IntroductionandapplicationofultrasonicUltrasonicisamechanicalwaveswhichfrequencyabove20,000Hz.Ultrasonicinspectioncommonlyusedinthefrequencyof0.5~5MHz.Themechanicalwavesinthematerialsprea
2、dinacertainspeedanddirections,acousticimpedancedifferentheterogeneousinterfacessuchasdefectisencounteredorthebottomsurfaceoftheobjectbeingtested,willreflections.Thisreflectionphenomenoncanbeusedtoultrasonictesting,mostcommonispulseechotestingmethodtesting,pulseo
3、scillatorissuedofvoltageplusinprobewithpressureelectricceramicorquartzchipmadeofdetectioncomponents,probeissuedofultrasonicpulsebysoundcoupledmediasuchasoilorwater,enteredmaterialandinwhichspread,encountereddefects,partreflectionenergyalongoriginalwayreturnsprob
4、e,probewillchangeitinelectricpulse,byinstrumentzoomanddisplayinoscilloscopetubesofscreen.Dependingonwheretheflawechoonthescreenandamplitudeofreflectionwavewithartificialdefectsinareferenceblockratecomparedtodefectlocationandapproximatedimensions.ApartfromEchomet
5、hod,anduseanotherprobetotheothersideoftheworkpiecetoacceptsignalpenetrationmethod.Whenuseultrasonicdetectionthephysicalpropertiesofmaterials,alsooftentakeadvantageofultrasonicinsoundvelocity,attenuationandresonancecharacteristicsofworkpiece.Ultrasoniccharacteris
6、tics:1,ultrasonicbeamtofocusonaspecificdirection,alongthestraightlinesinthemedia,hasagoodpoint.2,ultrasonicwavepropagationinthemedia,attenuationandscatteringoccurs.3,ultrasonicwaveontheinterfaceofheterogeneousmediawillmakereflection,refractionandmodeconversion.U
7、singthesefeatures,youcangetthedefectiveinterfacefromreflectedreflection,soastoachievethepurposeofdetectingdefects.4,ultrasonicenergyispowerthansonic.5,theultrasoniclossisverysmallinsolidtransmission,probedepth,asoccursinthehetero-interfacebyultrasonicphenomenasu
8、chasreflection,refraction,especiallynotbygas-solidinterface.Ifthemetalairholes,flawsandlayerdefectssuchasdefectsinagasoramixture,whendefectsattheinterfaceofultrasonic
