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NF X43-011-1975 空气污染.周围空气中燃气的硫含量的测定.取样设备和方法

上一篇: NF X43-010-1975 空气污染.燃气的酸污染指数的测定
下一篇: NF T90-111-1975 水的测试.通过测定理论导电率评估溶解盐的含量

Product Code:SAE AIR1672
Title:Practical Methods to Obtain Free-Field Sound Pressure Levels From Acoustical Measurements Over Ground Surfaces
Issuing Committee:A-21 Aircraft Noise Measure Noise Aviation Emission Modeling
Scope: Acquisition of free-field data is of practical significance in the field of aeronautical acoustics. The need for free-field data includes (but is not restricted to) the following: comparison of acoustical data obtained from the same engine under various measurement conditions; comparison of the results obtained from models with those from an engine on a test stand; comparison of noise measurements made on the same engine under static and in-flight conditions; design of test facilities; standardization of techniques for 'in situ' acoustical measurements; spectral decomposition to isolate the contribution of different sources to the total noise; and prediction of aircraft noise on the basis of methods which, generally, provide free-field data. There is an increasing tendency to test full-scale engine components and scale models in anechoic test facilities that provide free-field conditions. This AIR complements this work by identifying those methods in current use which provide free-field acoustic data for measurements on engines under static conditions in the presence of a ground surface. Separate Appendices to this AIR describe different methods for noise measurement in the field that conform with the state-of-the-art to a certain extent. That is, each method has generally been systematically used by at least oe free-field conditions. This AIR complements this work by identifying those methods in current use which provide free-field acoustic data for measurements on engines under static conditions in the presence of a ground surface. Separate Appendices to this AIR describe different methods for noise measurement in the field that conform with the state-of-the-art to a certain extent. That is, each method has generally been systematically used by at least one organization and has been substantiated by data obtained from at least one test site.ne organization and has been substantiated by data obtained from at least one test site.

标准名称：	进出口危险货物分类试验方法 第12部分:易燃气体
英文名称：	Test method of classification for import and export dangerous foods-Part 12:Flammable gases
中标分类：	综合 >> 标志、包装、运输、贮存 >> 标志、包装、运输、贮存综合
ICS分类：	货物的包装和调运 >> 货运调运 >> 货运调运综合
发布日期：	2006-11-10
实施日期：	2007-05-16
首发日期：
作废日期：
起草单位：	国家认证认可监督管理委员会
出版日期：
页数：	7

SN/T 1828的本部分规定了进出口易燃气体危险货物的要求、试验和类别判定。本部分适用于进出口易燃气体危险货物危险特性的试验。

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