【英文标准名称】:Aerospaceseries-Fibresandcables,optical,aircraftuse;Testmethods-Part301:Attenuation;GermanandEnglishversionEN3745-301:2002
【原文标准名称】:航空航天系列.飞机光纤和电缆.试验方法.第301部分:衰减
【标准号】:EN3745-301-2002
【标准状态】:现行
【国别】:
【发布日期】:2003-05
【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】:玻璃纤维电缆;阻尼(波);试验;玻璃纤维;衰减;航空工程;航空运输;航天运输;多语种的;光波导;光纤;飞行器;航空航天运输;电缆
【英文主题词】:Aeronauticalengineering;Aerospacetransport;Airtransport;Aircraft;Attenuations;Cables;Damping;Fibreoptics;Glassfibrecables;Glassfibres;Multilingual;Opticalwaveguides;Spacetransport;Testing
【摘要】:
【中国标准分类号】:V25
【国际标准分类号】:49_060
【页数】:9P.;A4
【正文语种】:英语
基本信息
| 标准名称： | 防爆铜合金工具安全性能检验规定 |
| 中标分类： |
电工 >>
低压电器 >>
防爆电器 |
| 发布日期： | |
| 实施日期： | 1991-04-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 8页 |
适用范围
没有内容
前言
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目录
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引用标准
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所属分类： 电工 低压电器 防爆电器
Product Code:SAE J2883
Title:Laboratory Measurement of Random Incidence Sound Absorption Tests Using a Small Reverberation Room
Issuing Committee:Acoustical Materials Committee
Scope: This SAE Recommended Practice describes a laboratory test procedure for measuring the random incidence sound absorption coefficient of a material in a small size reverberant sound field by measuring decay rates. Materials for absorption treatments may include homogeneous materials, nonhomogeneous materials, or a combination of homogeneous, nonhomogeneous, and/or inelastic impervious materials. These materials are commonly installed in transportation systems such as ground vehicles, marine products, and aircraft to reduce reverberant sound build-up and thus reduce the noise level in the environment by minimizing reflections off of hard surfaces. The test method described herein was developed also to describe a way to measure the absorption performance of a part or a sound package system that will relate to an application. to rank order materials for application on panels using general automotive steel but also may be applicable to other situations or conditions.The absorption performance for most materials and systems varies as a function of frequency. Accordingly, this test procedure includes provisions for measuring absorption over a frequency range found applicable to many transportation systems. Samples that are used typically in transportation industry are not thick enough to provide any significant absorptive properties below 250 Hz. Combining the size of the sample and the frequency range of interest for automotive and related applications, this test method has been developed for conducting measurements using a small reverberation room where the frequency range of interest would be from approximately 250 to 8000 Hz 1/3rd octave band frequency.
Rationale: This SAE Recommended Practice describes a laboratory test procedure for measuring the random incidence sound absorption coefficient of a material in a small size reverberant sound field by measuring decay rates. Materials for absorption treatments may include homogeneous materials, nonhomogeneous materials, or a combination of homogeneous, nonhomogeneous, and/or inelastic impervious materials. These materials are commonly installed in transportation systems such as ground vehicles, marine products, and aircraft to reduce reverberant sound build-up and thus reduce the noise level in the environment by minimizing reflections off of hard surfaces. The test method described herein was developed also to describe a way to measure the absorption performance of a part or a sound package system that will relate to an application. to rank order materials for application on panels using general automotive steel but also may be applicable to other situations or conditions.The absorption performance for most materials and systems varies as a function of frequency. Accordingly, this test procedure includes provisions for measuring absorption over a frequency range found applicable to many transportation systems. Samples that are used typically in transportation industry are not thick enough to provide any significant absorptive properties below 250 Hz. Combining the size of the sample and the frequency range of interest for automotive and related applications, this test method has been developed for conducting measurements using a small reverberation room where the frequency range of interest would be from approximately 250 to 8000 Hz 1/3rd octave band frequency.