【英文标准名称】:Informationprocessingsystems;datacommunication;multilinkprocedures;technicalcorrigendum1
【原文标准名称】:信息处理系统数据通信多链路规程技术勘误1
【标准号】:ISO7478TechnicalCorrigendum1-1989
【标准状态】:现行
【国别】:国际
【发布日期】:1989-03
【实施或试行日期】:1989-03-01
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/IEC/JTC1
【标准类型】:()
【标准水平】:()
【中文主题词】:数据处理;通信规程;控制规程;数据传输;规范;数据多链路(控制)规程
【英文主题词】:controlprocedures;dataprocessing;datatransmission;datamultilinkprocedures;communicationprocedure;communicationprocedures;specifications
【摘要】:Page10,clauseA.2MLPresetinitiatedbyasinglestation:replacetheexistingdiagrambythatgiveninthisCorrigendum.
【中国标准分类号】:L79
【国际标准分类号】:6983
【页数】:2P;A4
【正文语种】:英语


【英文标准名称】:LaboratoryMeasurementofTheCompositeVibrationDampingPropertiesofMaterialsonaSupportingSteelBar
【原文标准名称】:支撑钢棒上的器材的组合振动阻尼性能的实验室测量
【标准号】:ANSI/SAEJ1637-1993
【标准状态】:现行
【国别】:美国
【发布日期】:1993-02
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:buildingacoustics;materials;construction;vibrationdamping;measuringtechniques
【摘要】:ThisSAERecommendedPracticedescribesalaboratorytestprocedureformeasuringthevibrationdampingperformanceofasystemconsistingofadampingmaterialbondedtoavibratingcantileveredsteelbar.ThebarisoftencalledtheOberstbar(namedafterDr.H.Oberst)andthetestmethodisoftencalledtheOberstBarTestMethod.Materialsfordampingtreatmentsmayincludehomogeneousmaterials,nonhomogeneousmaterials,oracombinationofhomogeneous,nonhomogeneous,and/orinelastic(suchasaluminumfoil)materials.Thesematerialsarecommonlyinstalledintransportationsystemssuchasgroundvehicles,marineproducts,andaircrafttoreducevibrationatresonance,andthusreducethenoiseradiationfromthevibratingsurface.however,thetestmethoddescribedhereinwasdevelopedtorankordermaterialsusedinPASSENGERVEHICLEAPPLICATIONSwithsteelsheetmetalandmaynotbefullyapplicabletoothersituations.Dampingperformanceformostmaterialsandsystemsvariesasafunctionofbothfrequencyandtemperature.Accordingly,thistestprocedureincludesprovisionsformeasuringdampingoverarangeoffrequenciesandtemperaturesfoundapplicabletomanytransportationsystems.Themeasureddampingperformancewillbeexpressedintermsofcompositelossfactor,,withinthefrequencyrangeofapproximately100to1000Hz,andovertheusefultemperaturerangeforthegivenapplication.Thetermcompositereferstothesteelanddampingmaterialcombination.ThetestproceduredescribedhereisbasedonthemethoddescribedinASTME756.However,thisSAEdocumentdiffersfromtheASTME756methodinthattheSAEpracticespecifiesthebarmaterial,thebarsize,andthemountingconditionsofthetestsamples.Thisdocumentprovidesameansofrankorderingdampingmaterialsaccordingtotheircompositelossfactorvaluesfromtestsamplesthatrepresenttypicalpassengervehicleapplications.TheASTME756shouldbefollowedtodeterminethedampingpropertiesofmaterialsalone,includinglossfactor,YoungsmodulusE,andshearmodulusG.
【中国标准分类号】:Z32
【国际标准分类号】:
【页数】:
【正文语种】:英语