Product Code:SAE J167
Title:Overhead Protection for Agricultural Tractors--Test Procedures and Performance Requirements
Issuing Committee:Agricultural Tractor Standards Committee (Atsc)
Scope:This SAE Standard applies to an overhead cover installed on a protective frame or enclosure conforming to SAE J2194 or alternately SAE J1194 and the following additional requirement of a drop test to verify the effectiveness of the overhead cover in protecting the operator from falling objects.The test procedures and performance requirements outlined in this document are based on currently available engineering data.This document establishes test and performance requirements for overhead protection to minimize the frequency and severity of operator injury due to falling objects encountered in normal operation of a wheeled agricultural tractor.【英文标准名称】:Measurementofliquidflowinopenchannels-Computingstreamflowusinganunsteadyflowmodel
【原文标准名称】:明渠水流测量用不稳定流量模型计算水流流量
【标准号】:ISO/TR11627-1998
【标准状态】:现行
【国别】:国际
【发布日期】:1998-05
【实施或试行日期】:
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/TC113
【标准类型】:()
【标准水平】:()
【中文主题词】:速度测量;明渠流动;液体流动;流量测量;流量测量;斜槽
【英文主题词】:flowmeasurement;channelflow;flumes;velocitymeasurement;flowmeasurements;liquidflow
【摘要】:ThisTechnicalReportdescribesamethodforcomputingcontinuousrecordsofstreamflowinanopenchannelthroughthenumericalsolutionoftheone-dimensionalunsteadyflowequations.Suchanapproachistypicallyidentifiedasanunsteadyflowmodelandgenerallyinvolvestheuseofcomputersforsolutionoftheflowequations.Unsteadyflowmodelsareappropriateforcomputingstreamflowrecordsatlocationswhere(1)asingle-valuedstage-dischargerelationdoesnotexist,(2)backwateraffectsthedischargeunderselectedorallconditions,(3)flowsareaffectedbytides,or(4)itisnotpossibletogagetheflowusingvelocity-areamethods.Unsteadyflowmodelsalsoareappropriateforevaluatingtheeffectsofchangesinamanagedflowregimeondownstreamconditionspriortotheimplementationofanychanges.ThisTechnicalReportisapplicabletosteadyandunsteadyflows,tonomineeflows,andtotidalflowsinwhichtherearenosignificantlongitudinalandverticaldensitygradients.Themethodisconsideredequivalentto,orbetterthan,thecommonlyusedstage-fall-dischargetechnique(ISO1100-1:1996,7.2andAnnexC)becausethemethodusesinformationonthephysicalcharacteristicsofthechannel,includingthecross-sectionalgeometry,channelrugosityandchannelslope,andthemethodisbasedonamathematicaldescriptionofthephysicsoffluidflow.ThisTechnicalReportdescribesthetheoreticalbasisandfundamentalassumptionsofthetechnique,andprovidesasummaryofselectednumericalmethodsusedtosolvetheunsteadyflowequations.Alsoprovidedaredetailsontheapplicationofanunsteadyflowmodel,includingdatarequirements,proceduresformodelcalibration,testing,andapplications,andidentificationofuncertaintiesassociatedwiththemethod.ThisTechnicalReportdoesnotprovidesufficientinformationforthedevelopmentofacomputerprogramforsolvingtheunsteadyflowequations,butratherisbasedontheassumptionthatanadequatelydocumentedcomputerprogramisavailable
【中国标准分类号】:A53;P12
【国际标准分类号】:17_120_20
【页数】:23P;A4
【正文语种】:英语