【英文标准名称】:StandardPracticeforConstructionofaSteppedBlockandItsUsetoEstimateErrorsProducedbySpeed-of-SoundMeasurementSystemsforUseonSolids
【原文标准名称】:阶梯形砌块的结构和固体用声速测量系统对砌块进行检验产生的评估错误
【标准号】:ASTME1544-1999(2004)e1
【标准状态】:现行
【国别】:
【发布日期】:1999
【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】:E28.13
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:超声检验;无损检验;玻璃;试验
【英文主题词】:acousticvelocity;elasticmoduli;materialscharacterization;referencestandard;residualstress;speedofsound;stressmeasurement;ultrasonics
【摘要】:Theuseofsoundspeedvaluestodeterminechangesintheelasticconstantsduetoappliedorresidualstressrequiresthatsuchmeasurementsbeofhighprecisionandlowbias.Forthatreason,specialevaluationteststodeterminearepresentativeprecisionandbiasforthespecifictechnique,method,andequipmentsetupusedaregiven.Speedofsoundisameasurethatdependsontheaccuratemeasurementsoflengthofpathoftravelandtransittimeorotherrelatedparameterssuchasfrequency,etc.Bothmeasurementsaresubjecttocertaininterpretationsandassumptionsandarehighlydependentonlaboratoryexpertise.Thispracticeprovidesameansofcheckingoveralltechnique.Thispracticeshallbeusedwhenitisnecessarytoassessthesystematicandrandomerrorsassociatedwithaparticularspeedofsoundmeasurementinasolidmedium.Itcanbeusedtocheckbothequipmentperformanceandmeasurementtechniquefortheseerrors.Itcanalsobeusedtostudyinherenterrorsinaparticularmethod.ItcanalsobeusedtoassessproposedcorrectionstosoundspeedmeasurementssuchasthephasecorrectionsofPapadakis(3,4).Theresultantprecisionandbiasdeterminedbytheuseofthedescribedblockrepresentsamoreidealsituationthanthesamemeasurementperformedinpractice,inthefield.Thus,theerrorforthespecificfieldmeasurementmaybelargerthanindicatedbythistest.Thistestrepresentsthebesterrorconditionforagiventechniqueandpractice.1.1Thispracticeprovidesameansforevaluatingbothsystematicandrandomerrorsforultrasonicspeed-of-soundmeasurementsystemswhichareusedforevaluatingmaterialcharacteristicsassociatedwithresidualstressandwhichmayalsobeusedfornondestructivemeasurementsofthedynamicelasticmoduliofmaterials.Importantfeaturesandconstructiondetailsofareferenceblockcrucialtotheseerrorevaluationsaredescribed.Thispracticecanbeusedwhenevertheprecisionandbiasofsoundspeedvaluesareinquestion.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q17
【国际标准分类号】:
【页数】:6P.;A4
【正文语种】:


Product Code:SAE ARP4990
Title:Turbine Flowmeter Fuel Flow Calculations
Issuing Committee:Eg-1e Test Cells Committee
Scope: This SAE Aerospace Recommended Practice (ARP) provides to the aerospace industry a procedure for the consistent and accurate calculation of fuel flow using turbine flowmeters during development, production, and post overhaul/repair gas turbine engine testing.