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【英文标准名称】:StandardPracticeforContinuousMonitoringofAcousticEmissionfromMetalPressureBoundaries
【原文标准名称】:连续监测来自金属压力界面的声发射的标准实施规程
【标准号】:ASTME1139-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E07.04
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:声学;界面;金属;噪声辐射;无损检验;压力;声音传播;监督(认可);测试
【英文主题词】:acousticemission;acousticemissionsourcelocation;continuousmonitoring;leakdetection;metalpiping;metalpressurevessels;pressuresystems;Acousticemission(AE)testing--metals/metallicmaterials;Automatedprocedures--metals/alloys;Contin
【摘要】:p>Acousticemissionexaminationofastructurerequiresapplicationofamechanicalorthermalstimulus.Inthiscase,thesystemoperatingconditionsprovidethestimulation.Duringoperationofthepressurizedsystem,AEfromactivediscontinuitiessuchascracksorfromotheracousticsourcessuchasleakageofhigh-pressure,high-temperaturefluidscanbedetectedbyaninstrumentationsystemusingsensorsmountedonthestructure.Thesensorsareacousticallycoupledtothesurfaceofthestructurebymeansofacouplantmaterialorpressureontheinterfacebetweenthesensingdeviceandthestructure.Thisfacilitatesthetransmissionofacousticenergytothesensor.Whenthesensorsareexcitedbyacousticemissionenergy,theytransformthemechanicalexcitationsintoelectricalsignals.ThesignalsfromadetectedAEsourceareelectronicallyconditionedandprocessedtoproduceinformationrelativetosourcelocationandotherparametersneededforAEsourcecharacterizationandevaluation.AEmonitoringonacontinuousbasisisacurrentlyavailablemethodforcontinuoussurveillanceofastructuretoassessitscontinuedintegrity.TheuseofAEmonitoringinthiscontextistoidentifytheexistenceandlocationofAEsources.Also,informationisprovidedtofacilitateestimatingthesignificanceofthedetectedAEsourcerelativetocontinuedpressuresystemoperation.Sourcelocationaccuracyisinfluencedbyfactorsthataffectelasticwavepropagation,bysensorcoupling,andbysignalprocessorsettings.ItispossibletomeasureAEandidentifyAEsourcelocationsofindicationsthatcannotbedetectedbyotherNDTmethods,duetofactorsrelatedtomethodological,material,orstructuralcharacteristics.InadditiontoimmediateevaluationoftheAEsources,apermanentrecordofthetotaldatacollected(AEpluspressuresystemparametersmeasured)providesanarchivalrecordwhichcanbere-evaluated.1.1Thispracticeprovidesguidelinesforcontinuousmonitoringofacousticemission(AE)frommetalpressureboundariesinindustrialsystemsduringoperation.Examplesarepressurevessels,piping,andothersystemcomponentswhichservetocontainsystempressure.Pressureboundariesotherthanmetal,suchascomposites,arespecificallynotcoveredbythisdocument.1.2ThefunctionsofAEmonitoringaretodetect,locate,andcharacterizeAEsourcestoprovidedatatoevaluatetheirsignificancerelativetopressureboundaryintegrity.Thesesourcesarethoseactivatedduringsystemoperation,thatis,nospecialstimulusisappliedtoproduceAE.Othermethodsofnondestructivetesting(NDT)maybeused,whenthepressureboundaryisaccessible,tofurtherevaluateorsubstantiatethesignificanceofdetectedAEsources.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificprecautionarystatements,seeSection6.
【中国标准分类号】:H20
【国际标准分类号】:17_140_01
【页数】:6P.;A4
【正文语种】: