基本信息
| 标准名称： | 牵引电机清洗设备技术条件 |
| 中标分类： |
铁路 >>
机车车辆通用标准 >>
机车车辆检修工艺与设备 |
| 发布日期： | 1997-09-21 |
| 实施日期： | 1998-04-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 6页 |
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所属分类： 铁路 机车车辆通用标准 机车车辆检修工艺与设备
【英文标准名称】:StandardGuideforEvaluatingPerformanceCharacteristicsofPhased-ArrayUltrasonicTestingInstrumentsandSystems
【原文标准名称】:评估性能特征的相控接收阵列超声波测试仪器和系统的标准指南
【标准号】:ASTME2491-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:E07.06
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:characterization;focalpoint;phased-array;phased-arrayprobe;soundbeamprofile;ultrasound;Nondestructivetesting;Phased-array;Probe;Ultrasonicexamination
【摘要】:Thisguideisintendedtoevaluateperformanceassessmentofcombinationsofphased-arrayprobesandinstruments.Itisnotintendedtodefineperformanceandacceptancecriteria,butrathertoprovidedatafromwhichsuchcriteriamaybeestablished.Recommendedproceduresdescribedinthisguideareintendedtoprovideperformance-relatedmeasurementsthatcanbereproducedunderthespecifiedtestconditionsusingsimpletargetsandthephased-arraytestsystemitself.Itisintendedforphased-arrayflawdetectioninstrumentsoperatinginthenominalfrequencyrangeof1MHzto20MHz,buttheproceduresareapplicabletomeasurementsoninstrumentsutilizingsignificantlyhigherfrequencycomponents.Thisguideisnotintendedforservicecalibration,ormaintenanceofcircuitryforwhichthemanufacturerx2019;sinstructionsareavailable.Implementationofspecificassessmentsmayrequiremoredetailedproceduralinstructionsinaformatoftheusingfacility.Themeasurementdataobtainedmaybeemployedbyusersofthisguidetospecify,describe,orprovideaperformancecriteriaforprocurementandqualityassurance,orserviceevaluationoftheoperatingcharacteristicsofphased-arraysystems.Notallassessmentsdescribedinthisguideareapplicabletoallsystems.Allorportionsoftheguidemaybeusedasdeterminedbytheuser.1.1Thisguidedescribesproceduresforevaluatingsomeperformancecharacteristicsofphased-arrayultrasonicexaminationinstrumentsandsystems.1.2Evaluationofthesecharacteristicsisintendedtobeusedforcomparinginstrumentsandsystemsor,byperiodicrepetition,fordetectinglong-termchangesinthecharacteristicsofagiveninstrumentorsystemthatmaybeindicativeofimpendingfailure,andwhich,ifbeyondcertainlimits,willrequirecorrectivemaintenance.Instrumentcharacteristicsmeasuredinaccordancewiththisguideareexpressedintermsthatrelatetotheirpotentialusefulnessforultrasonicexaminations.Otherelectronicinstrumentcharacteristicsinphased-arrayunitsaresimilartonon-phased-arrayunitsandmaybemeasuredasdescribedinE1065orE1324.1.3Ultrasonicexaminationsystemsusingpulsed-wavetrainsandA-scanpresentation(rforvideo)maybeevaluated.1.4Thisguideestablishesnoperformancelimitsforexaminationsystems;ifsuchacceptancecriteriaarerequired,thesemustbespecifiedbytheusingparties.Whereacceptancecriteriaareimpliedhereintheyareforexampleonlyandaresubjecttomoreorlessrestrictivelimitsimposedbycustomerx2019;sandenduserx2019;scontrollingdocuments.1.5Thespecificparameterstobeevaluated,conditionsandfrequencyoftest,andreportdatarequired,mustalsobedeterminedbytheuser.1.6Thisguidemaybeusedfortheevaluationofacompleteexaminationsystem,includingsearchunit,instrument,interconnections,scannerfixturesandconnectedalarmandauxiliarydevices,primarilyincaseswheresuchasystemisusedrepetitivelywithoutchangeorsubstitution.Thisguideisnotintendedtobeusedasasubstituteforcalibrationorstandardizationofaninstrumentorsystemtoinspectanygivenmaterial.1.7Requiredtestapparatusincludesselectedtestblocksandpositionencodersinadditiontotheinstrumentorsystemtobeevaluated.1.8Precautionsrelatingtotheapplicabilityoftheproceduresandinterpretationoftheresultsareincluded.1.9Alternateprocedures,suchasexamplesdescribedinthisdocument,orothers,mayonlybeusedwithcustomerapproval.1.10ThevaluesstatedinSI......
【中国标准分类号】:N77
【国际标准分类号】:19_100
【页数】:18P.;A4
【正文语种】:英语