【英文标准名称】:StandardPracticeforQCMMeasurementofSpacecraftMolecularContaminationinSpace
【原文标准名称】:对太空中航天器分子污染进行QCM测量的标准实施规程
【标准号】:ASTME2311-2004
【标准状态】:现行
【国别】:
【发布日期】:2004
【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】:E21.05
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:contaminationmeasurement;molecularcontamination;outgassing;outgassingrates;quartzcrystalmicrobalance;spacecraftcontamination;temperaturecontrolledquartzcrystalmicrobalance
【摘要】:Spacecrafthaveconsistentlyhadtheproblemofcontaminationofthermalcontrolsurfacesfromline-of-sightwarmsurfacesonthevehicle,outgassingofmaterialsandsubsequentcondensationoncriticalsurfaces,suchassolararrays,movingmechanicalassemblies,cryogenicinsulationschemes,andelectricalcontacts,controljeteffects,andotherformsofexpellingmoleculesinavaporstream.Tothishasbeenaddedtheneedtoprotectopticalcomponents,eitheratambientorcryogenictemperatures,fromtheminutestdepositionofcontaminantsbecauseoftheirabsorptance,reflectanceorscatteringcharacteristics.Muchprogresshasbeenaccomplishedinthisarea,suchasthecarefultestingofeachmaterialforoutgassingcharacteristicsbeforethematerialisusedonthespacecraft(followingTestMethodsE595andE1559),butmeasurementandcontrolofcriticalsurfacesduringspaceflightstillcanaidinthedeterminationoflocationandbehaviorofoutgassingmaterials.1.1Thispracticeprovidesguidanceformakingdecisionsconcerningtheuseofaquartzcrystalmicrobalance(QCM)andathermoelectricallycooledquartzcrystalmicrobalance(TQCM)inspacewherecontaminationproblemsonspacecraftarelikelytoexist.Carefuladherencetothisdocumentshouldensureadequatemeasurementofcondensationofmolecularconstituentsthatarecommonlytermed"contamination"onspacecraftsurfaces.1.2Acorollarypurposeistoprovidechoicesamongtheflight-qualifiedQCMsnowexistingtomeetspecificneeds.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Z04
【国际标准分类号】:71_040_99
【页数】:22P.;A4
【正文语种】:


Product Code:SAE J1131
Title:Performance Requirements for SAE J844 Nonmetallic Air Brake Tubing and SAE J246 Compression Fitting Assemblies Used in Vehicular Air Brake Systems
Issuing Committee:Air Brake Tubing And Tube Ftg Committee
Scope: This SAE Standard is intended to establish uniform methods of testing SAE J844 tubing and fitting assemblies as used in automotive air brake systems. This document also establishes minimum qualifications for tensile and pressure capabilities, vibrational durability under cyclic temperatures, serviceability, and fitting compatibility requirements. The specific tests and performance criteria applicable to the tubing are set forth in SAE J844. NOTE--The test values contained in this document are for test purposes only. For environmental and usage limitations see SAE J844.Fittings--A type of fitting for use with SAE J844 nonmetallic tubing is included in SAE J246; however, it is not intended to restrict or preclude the use of other designs of fittings that comply with this document.
Rationale: This SAE Standard is intended to establish uniform methods of testing SAE J844 tubing and fitting assemblies as used in automotive air brake systems. This document also establishes minimum qualifications for tensile and pressure capabilities, vibrational durability under cyclic temperatures, serviceability, and fitting compatibility requirements. The specific tests and performance criteria applicable to the tubing are set forth in SAE J844. NOTE--The test values contained in this document are for test purposes only. For environmental and usage limitations see SAE J844.Fittings--A type of fitting for use with SAE J844 nonmetallic tubing is included in SAE J246; however, it is not intended to restrict or preclude the use of other designs of fittings that comply with this document.