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ASTM D 3374-1999 乙烯涂覆的玻璃丝标准规范

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【英文标准名称】:Methodsofmeasurementforradiotransmitters.Part5:performancecharacteristicsoftelevisiontransmitters.
【原文标准名称】:无线电发射机的测量方法.第5部分:电视发射机的性能特性
【标准号】:NFC94-225-1994
【标准状态】:现行
【国别】:法国
【发布日期】:1994-09-01
【实施或试行日期】:1994-09-20
【发布单位】:法国标准化协会(AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:M36
【国际标准分类号】:33_170
【页数】:98P;A4
【正文语种】:其他


Product Code:SAE AIR4002
Title:8000 Psi Hydraulic Systems: Experience and Test Results
Issuing Committee:A-6a2 Military Aircraft Committee
Scope: Shortly after World War II, as aircraft became more sophisticated and power-assist, flight-control functions became a requirement, hydraulic system operating pressures rose from the 1000 psi level to the 3000 psi level found on most aircraft today. Since then, 4000 psi systems have been developed for the U.S. Air Force XB-70 and B-1 bombers and a number of European aircraft including the tornado multirole combat aircraft and the Concorde supersonic transport. The V-22 Osprey incorporates a 5000 psi hydraulic system. The power levels of military aircraft hydraulic systems have continued to rise. This is primarily due to higher aerodynamic loading, combined with the increased hydraulic functions and operations of each new aircraft. At the same time, aircraft structures and wings have been getting smaller and thinner as mission requirements expand. Thus, internal physical space available for plumbing and components continues to decrease. In the 1960s, the U.S. Navy began a methodical process of developing lightweight hydraulic systems (LHS) for aircraft. The Navy was keenly aware that aircraft designers would be faced with requirements for higher horsepower hydraulic systems in future high-performance, high-density aircraft. The Air Force has also pursued the use of LHS to complement their Fire Resistant Hydraulic systems program. One logical way to achieve smaller and lighter weight hydraulic components is to raise the system operating pressure levels. Studies conducted under both Navy and Air Force programs have indicated that 8000 psi hydraulic systems are feasible and can achieve significant weight reduction and space savings for certain aircraft. Many of the hardware elements necessary for 8000 psi hydraulic systems have been designed, fabricated, and tested in the programs discussed herein. The purpose of this document is to outline experience and test results to date when operating hydraulic systems at 8000 psi.

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