您的位置: 标准下载 » 协会标准 » SAE 美国机动车工程师学会 »

SAE AIR5024 Landing Gear Switch Selection Criteria

作者:标准资料网 时间:2024-05-17 04:25:07  浏览:8346   来源:标准资料网
下载地址: 点击此处下载
Product Code:SAE AIR5024
Title:Landing Gear Switch Selection Criteria
Issuing Committee:A-5b Gears, Struts And Couplings Committee
Scope:The scope of this document is to discuss the differences between electromechanical and proximity position sensing devices when used on landing gears. It also contains information, which may be helpful, when applying either type of technology after the selection has been made. The purpose is to help the designer make better choices when selecting a position-sensing device. Once that choice has been made, this document includes information to improve the reliability of new or current designs. It is not intended to replace recommendations from sensor manufacturers or actual experience, but to provide a set of general guidelines.
下载地址: 点击此处下载
【英文标准名称】:StandardPracticeforMeasuringtheUltrasonicVelocityinPolyethyleneTankWallsUsingLateralLongitudinal(LCR)Waves
【原文标准名称】:利用侧向纵波(L)测定聚乙烯容器壁中超声波速度的标准实施规程
【标准号】:ASTME2479-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【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】:E07.06
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:侧面的;测量;聚乙烯;容器壁;超声波学;速度;墙
【英文主题词】:
【摘要】:1.1Thispracticecoversaprocedureformeasuringtheultrasonicvelocitiesintheouterwallofpolyethylenestoragetanks.Ananglebeamlaterallongitudinal(LCR)waveisexcitedwithwedgesalongacircumferentialchordofthetankwall.Adigitalultrasonicflawdetectorisusedwithsending-receivingsearchunitsinthroughtransmissionmode.Theobservedvelocityistemperaturecorrectedandcomparedtotheexpectedvelocityforanew,unexposedsampleofmaterialwhichisthesameasthematerialbeingevaluated.ThedifferencebetweentheobservedandtemperaturecorrectedvelocitiesdeterminesthedegreeofUVexposureofthetank.1.2Thepracticeisintendedforapplicationtotheoutersurfacesofthewallofpolyethylenetanks.Degradationtypicallyoccursinanouterlayerapproximately3.2-mm[0.125-in.]thick.Sincethetechniquedoesnotinterrogatetheinsidewallofthetank,wallthicknessisnotaconsiderationotherthantobeawareofpossibleguided(Lamb)waveeffectsorreflectionsoffoftheinnertankwall.Nospecialsurfacepreparationisnecessarybeyondwipingtheareawithacleanrag.Insidewallpropertiesarenotimportantsincethelongitudinalwavedoesnotstrikethissurface.TheexcitationofLambwavesmustbeavoidedbychoosinganexcitationfrequencysuchthattheratioofwavelengthtowallthicknessisonefifthorless.1.3UVdegradationontheoutersurfacecausesastiffeningofthematerialandanincreaseinYoung''smodulusandthelongitudinalwavevelocity.
【中国标准分类号】:A82
【国际标准分类号】:23_020_10;83_080_01
【页数】:7P.;A4
【正文语种】:


【英文标准名称】:StandardSpecificationforNavalBrassRod,Bar,andShapes
【原文标准名称】:海军军舰用黄铜棍,棒和型材标准规范
【标准号】:ASTMB21/B21M-2001
【标准状态】:作废
【国别】:美国
【发布日期】:2001
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:黄铜;棒材
【英文主题词】:Alloys;Bars(materials);Brass;Copper;Copperalloys;Navy;Non-ferrousmetals
【摘要】:
【中国标准分类号】:U05
【国际标准分类号】:77_150_30
【页数】:7P;A4
【正文语种】:英语