Product Code:SAE AIR1407
Title:Prediction Procedure for Near-Field and Far-Field Propeller Noise
Issuing Committee:A-21 Aircraft Noise Measure Noise Aviation Emission Modeling
Scope: This high static thrust and relatively low installed engine power for propellers has been a factor in their consideration as propuslors for vertical and short take-off and landing (V/STOL) aircraft. The simplicity and low cost of the propeller has historically been a factor in its selection for the majority of general aviation aircraft. With the increased emphasis on noise generated by all types of aircraft there has been an increasing interest in controlling the noise of new V/STOL and conventional transport aircraft as well as general aviation aircraft. To assist the designer of new aircraft as well as others interested in the noise characteristics of various propeller configurations the procedure described in this Aerospace Information Report (AIR) has been developed.【英文标准名称】:Metallicpowders-Determinationofapparentdensity-Part1:Funnelmethod
【原文标准名称】:金属粉末.表观密度的测定.第1部分:漏斗法
【标准号】:ISO3923-1-2008
【标准状态】:现行
【国别】:国际
【发布日期】:2008-05
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC119
【标准类型】:()
【标准水平】:()
【中文主题词】:表观密度;体密度;密度;密度测量;测定;漏斗;漏斗(实验室);金属粉末;粉末;粉末冶金;产品;试样;测试;体积
【英文主题词】:Apparentdensity;Bulkdensity;Density;Densitymeasurement;Determination;Funnels;Funnels(laboratory);Metallicpowders;Powder;Powdermetallurgy;Products;Samples;Testing;Testingdevices;Volume
【摘要】:ThispartofISO3923specifiesthefunnelmethodforthedeterminationoftheapparentdensityofmetallicpowdersunderstandardizedconditions.Themethodisintendedformetallicpowdersthatflowfreelythrougha2,5mmdiameterorifice.Itmay,however,beusedforpowdersthatflowwithdifficultythrougha2,5mmdiameterorificebutflowthrougha5mmdiameterorifice.Methodsforthedeterminationoftheapparentdensityofpowdersthatwillnotflowthrougha5mmdiameterorificearespecifiedinISO3923-2.
【中国标准分类号】:H16
【国际标准分类号】:77_160
【页数】:10P.;A4
【正文语种】:英语