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07116201指导教师职称李梅副教授2011年5月25日IntroductionandapplicationofultrasonicUltrasonicisamechanicalwaveswhichfrequencyabove20,~,acousticimpedancedifferentheterogeneousinterfacessuchasdefectisencounteredorthebottomsurfaceoftheobjectbeingtested,,monispulseechotestingmethodtesting,ponents,probeissuedofultrasonicpulsebysoundcoupledmediasuchasoilorwater,enteredmaterialandinwhichspread,encountereddefects,partreflectionenergyalongoriginalwayreturnsprobe,probewillchangeitinelectricpulse,,,alsooftentakeadvantageofultrasonicinsoundvelocity,:1,ultrasonicbeamtofocusonaspecificdirection,alongthestraightlinesinthemedia,,ultrasonicwavepropagationinthemedia,,ultrasonicwaveontheinterfaceofheterogeneousmediawillmakereflection,,youcangetthedefectiveinterfacefromreflectedreflection,,,theultrason
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