GB 3936.3-1983 胶轮力车 辐条和条帽
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基本信息
| 标准名称： | 胶轮力车 辐条和条帽 |
| 中标分类： | |
| 替代情况： | 调整为JB/T 8305.3-1995 |
| 发布日期： | |
| 实施日期： | 1984-11-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 2页 |
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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.【英文标准名称】:StandardTestMethodforPillingResistanceandOtherRelatedSurfaceChangesofTextileFabrics:RandomTumblePillingTester
【原文标准名称】:用随机转筒起球试验器测定纺织物表面的抗起球性及其它有关表面变化的试验方法
【标准号】:ASTMD3512-2002
【标准状态】:作废
【国别】:美国
【发布日期】:2002
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【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】:W04
【国际标准分类号】:59_080_30
【页数】:6P;A4
【正文语种】:英语
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.【英文标准名称】:StandardTestMethodforPillingResistanceandOtherRelatedSurfaceChangesofTextileFabrics:RandomTumblePillingTester
【原文标准名称】:用随机转筒起球试验器测定纺织物表面的抗起球性及其它有关表面变化的试验方法
【标准号】:ASTMD3512-2002
【标准状态】:作废
【国别】:美国
【发布日期】:2002
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【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】:W04
【国际标准分类号】:59_080_30
【页数】:6P;A4
【正文语种】:英语