格式参考范文

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1、MeasuringreflectioncoefficientofunderwateracousticmaterialswiththevectorhydrophoneXiaoerWangXiaomingZhouXiaoerWang（回人‘DaweiZhangScienceandTechnologyonUnderwaterAcousticAntagonizingLaboratoryShanghaiMarineElectronicEquipmentResearchInstituteShanghai,China201108e-mail

2、:xiaoer@126.comXiaomingZhouLaboratoryofUnderwaterAcousticTechnology,DaweiZhangCollegeofUnderwateracousticengineeringHarbinEngineeringUniversityHarbin,ChinaAbstract.Reflectioncoefficientofunderwatermaterialscanbecalculatebymeasuringimpedanceabovethesample,sometechniqu

3、eswhichmeasurereflectioncoefficientarcbasedonthesoundpressure・Thispaperintroducesamethodformeasuringreflectioncoefficientwithvectorhydrophonewhichcanmeasuretheinstantaneoussoundpressureandsoundparticlevelocity.Thenthereflectioncoefficientcanbecalculatedbyimpedancewhi

4、chisacquiredbysoundpressureandparticlevelocity.Somesimulationsandexperimentsinthispapershowthatthemethodwithvectorhydrophonehaveagoodperfonnanceinmeasuringreflectioncoefficient,theminimumerroris0.006・Itprovethatthemethodiseffectivebothinverticalandobliqueincidence,ha

5、ndyinpractice.Keywords：vectorhydrophone;reflectioncoefficient;impedancc;obliqucincidence1IntroductionReflectioncoefficientisusedtoguidancetoapplyingundenvateracousticmaterials,andmeasuringreflectioncoefficientisabasictechnologyinunderwateracousticengineering・Freefiel

6、dmethodandImpedancetubemethodarcmainmethodofmeasuringreflectioncoefficientpresently[1],thestandingwavetubemethodhasbecomethenationalstandard[2].Butthesampleofstandingwavetubecouldbeonlysmallone,itisn'tsuitformeasuringthematerialswhichhaslateralvariations.Freefieldmet

7、hodsnotonlymeasurethebiggersamplewhichhaslateralvariations,butalsomeasureforobliqueincidences,whichinducingmanyinterested.Thevectorhydrophoneconsistsofpressuresensorsandparticlevelocitysensors[3],whichmeasurespressureandorthogonalcomponentsofparticlevelocityco-locale

8、sandinstantaneously.Manyresearchersarcinterestedinitbecauseitbringsnewideastosolvetheunderwateracousticproblems.Thispaperisfocusedo