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BS EN 60721-3-5-1997 环境条件分类.第3部分:环境参数组及其严酷程度分类.第5节:地面车辆装配

作者:标准资料网 时间:2024-05-03 06:25:36  浏览:9248   来源:标准资料网
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【英文标准名称】:Classificationofenvironmentalconditions-Classificationofgroupsofenvironmentalparametersandtheirseverities-Groundvehicleinstallations
【原文标准名称】:环境条件分类.第3部分:环境参数组及其严酷程度分类.第5节:地面车辆装配
【标准号】:BSEN60721-3-5-1997
【标准状态】:现行
【国别】:英国
【发布日期】:1997-08-15
【实施或试行日期】:1997-08-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:生物危害;分类系统;地面车辆;振动;温度;尘埃;工作环境;电气设备;等级(质量);电子设备及元件;气候;气候带;砂;电气元件;化学危害;湿度;冲击试验;电力设备;天气
【英文主题词】:Biologicalsystems;Classification;Classificationsystems;Climate;Climaticcondition;Contamination;Definition;Definitions;Degreeofsharpness;Electricalengineering;Environment;Environmentalcondition;Environmentalconditions;Environmentaleffects;Environmentalfactorofinfluence;Environmentaltesting;Groundvehicles;Influencequantity;Inserts;Installation;Installations;Limits(mathematics);Mounting;Parameters;Pests;Products;Use;Vehicles;Vibration;Weathering
【摘要】:Conditionstowhichaproductnotformingpartofthevehicleissubjectedwheninstallede.g.radios,communicationsystems,faremeters,andflowmetersforliquidstransportedbythevehicle.
【中国标准分类号】:A21
【国际标准分类号】:19_040
【页数】:34P.;A4
【正文语种】:英语


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基本信息
标准名称:用于辅助过电流保护的熔断器
英文名称:Fuses for supplementary overcurrent protection
中标分类: 石油 >> 石油综合 >> 技术管理
发布日期:1993-12-20
实施日期:1994-06-01
首发日期:1900-01-01
作废日期:2010-01-20
出版日期:1900-01-01
页数:14页
适用范围

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所属分类: 石油 石油综合 技术管理
【英文标准名称】:StandardTestMethodforCalculationofStagnationEnthalpyfromHeatTransferTheoryandExperimentalMeasurementsofStagnation-PointHeatTransferandPressure
【原文标准名称】:通过临界点传热与压力的热传递理论和实验测量来计算临界热函的标准试验方法
【标准号】:ASTME637-2005
【标准状态】:现行
【国别】:
【发布日期】:2005
【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】:E21.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:航空航天运输;焓;热传递;材料;数学计算;测量;压力;航天技术;临界点
【英文主题词】:enthalpydistribution;enthalpyprofile;localenthalpy;stagnationenthalpy
【摘要】:Thepurposeofthistestmethodistoprovideastandardcalculationofthestagnationenthalpyofanaerodynamicsimulationdeviceusingtheheattransfertheoryandmeasuredvaluesofstagnationpointheattransferandpressure.Astagnationenthalpyobtainedbythistestmethodgivesaconsistentsetofdata,alongwithheattransferandstagnationpressureforablationcomputations.1.1Thistestmethodcoversthecalculationfromheattransfertheoryofthestagnationenthalpyfromexperimentalmeasurementsofthestagnation-pointheattransferandstagnationpressure.1.2Advantages1.2.1Avalueofstagnationenthalpycanbeobtainedatthelocationinthestreamwherethemodelistested.Thisvaluegivesaconsistentsetofdata,alongwithheattransferandstagnationpressure,forablationcomputations.1.2.2Thiscomputationofstagnationenthalpydoesnotrequirethemeasurementofanyarcheaterparameters.1.3LimitationsandConsiderationsTherearemanyfactorsthatmaycontributetoanerrorusingthistypeofapproachtocalculatestagnationenthalpy,including:1.3.1TurbulenceTheturbulencegeneratedbyaddingenergytothestreammaycausedeviationfromthelaminarequilibriumheattransfertheory.1.3.2Equilibrium,Nonequilibrium,orFrozenStateofGasThereactionratesandexpansionsmaybesuchthatthegasisfarfromthermodynamicequilibrium.1.3.3NoncatalyticEffectsThesurfacerecombinationratesandthecharacteristicsofthemetalliccalorimetermaygiveaheattransferdeviationfromtheequilibriumtheory.1.3.4FreeElectricCurrentsThearc-heatedgasstreammayhavefreeelectriccurrentsthatwillcontributetomeasuredexperimentalheattransferrates.1.3.5NonuniformPressureProfileAnonuniformpressureprofileintheregionofthestreamatthepointoftheheattransfermeasurementcoulddistortthestagnationpointvelocitygradient.1.3.6MachNumberEffectsThenondimensionalstagnation-pointvelocitygradientisafunctionoftheMachnumber.Inaddition,theMachnumberisafunctionofenthalpyandpressuresuchthataniterativeprocessisnecessary.1.3.7ModelShapeThenondimensionalstagnation-pointvelocitygradientisafunctionofmodelshape.1.3.8RadiationEffectsThehotgasstreammaycontributearadiativecomponenttotheheattransferrate.1.3.9HeatTransferRateMeasurementAnerrormaybemadeintheheattransfermeasurement(seeMethodE469andTestMethodsE422,E457,E459,andE511).1.3.10ContaminationTheelectrodematerialmaybeofalargeenoughpercentageofthemassflowratetocontributetotheheattransferratemeasurement.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A54
【国际标准分类号】:
【页数】:16P.;A4
【正文语种】:



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