【英文标准名称】:Aerospaceseries-Markingofaerospaceproducts;GermanandEnglishversionEN2424:2008
【原文标准名称】:航空航天系列.航空航天产品的标记
【标准号】:EN2424-2008
【标准状态】:现行
【国别】:
【发布日期】:2008-10
【实施或试行日期】:
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:航空工程;航空航天运输;航空运输;航空器部件;分类;设计;名称与符号;企业;识别;识别方法;清晰度;作标记;标记信息;多语种的;产品;航天运输;航天飞行器
【英文主题词】:Aeronauticalengineering;Aerospacetransport;Airtransport;Aircraftcomponents;Classification;Design;Designations;Enterprises;Identification;Identificationmethods;Legibility;Marking;Markinginformation;Multilingual;Products;Spacetransport;Spacevehicles
【摘要】:
【中国标准分类号】:V04
【国际标准分类号】:49_035
【页数】:16P.;A4
【正文语种】:英语
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.
基本信息
| 标准名称： | 薯类食品卫生要求 |
| 发布部门： | 北京市质量技术监督局 |
| 发布日期： | 2009-02-06 |
| 实施日期： | 2009-08-01 |
| 首发日期： | |
| 作废日期： | |
| 出版社： | 中国标准出版社 |
| 出版日期： | 2009-08-01 |
适用范围
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所属分类： 农业 林业 畜牧 畜牧综合 农业 农业和林业 动物饲养和繁殖