SAE J2409 Strain-Life Fatigue Data Exchange File Format
作者:标准资料网 时间:2024-05-05 23:38:24 浏览:9530
来源:标准资料网
Product Code:SAE J2409
Title:Strain-Life Fatigue Data Exchange File Format
Issuing Committee:Fatigue Design And Eval Executive Advisory Group
Scope:SAE format for a SIMPLE Strain-Life Fatigue Data Exchange File Format. The object of this SAE Standard is to provide a simple common way to exchange strain-life fatigue data collected from ASTM E 606 axial fatigue test data.
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.
基本信息
| 标准名称： | 冲压剪切下料 未注公差尺寸的极限偏差 |
| 英文名称： | Permissible limit ceviation in dimensions without tolerance indication for shearing of metal plates |
| 中标分类： |
机械 >>
加工工艺 >>
锻压 |
| ICS分类： |
机械制造 >>
制造成型过程
|
| 替代情况： | JB 4381-1987;被JB/T 4381-2011代替 |
| 发布部门： | 全国锻压标准化技术委员会 |
| 发布日期： | 1999-06-24 |
| 实施日期： | 2000-06-24 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 2011-11-01 |
| 归口单位： | 全国锻压标准化技术委员会 |
| 出版日期： | 1900-01-01 |
| 页数： | 7 页 |
| 批文号： | 国机管[1999]353号 |
适用范围
JB/T 4381-1999 本标准非等效采用 JIS B O410-1978《金属板剪切加工的普通容差》。 本标准是对 JB 4381-87《冲压剪切下料件 公差》的修订。修订时对技术内容略有增删。 本标准规定了龙门式、开式剪板机剪切厚度为 12mm 以下的金属板件或供冲压用板坯的宽度、直线度、毛刺高度的公差。主要适用于图样上未注出公差的尺寸和要素。 本标准不能满足剪切板件及冲压板坯的要求或允许采用比本标准规定更大的公差时，应单独标注尺寸公差或注明要素的技术要求。 本标准于年月日首次发布。
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所属分类： 机械 加工工艺 锻压 机械制造 制造成型过程
