Product Code:SAE J1400
Title:Laboratory Measurement of the Airborne Sound Barrier Performance of Flat Materials and Assemblies
Issuing Committee:Acoustical Materials Committee
Scope:This SAE Recommended Practice presents a test procedure for determining the airborne sound barrier performance of materials and composite assemblies commonly installed in surface vehicles and marine products.This document is intended to provide a means of rank ordering barrier materials according to their sound transmission loss. At each test frequency the transmission loss (TL) is projected from the measured noise reduction of the test specimen using a correlation factor (CF). The respective CF for the test condition is determined as the differences between the measured noise reduction (MNR) of a homogeneous limp panel, such as lead, and its calculated field-incidence transmission loss. Latitude is permitted in certain test conditions that do not necessarily conform to all of the acoustical requirements of ASTM E 90. This method facilitates the evaluation of automotive materials and assemblies under conditions of representative size, edge constraint, and sound incidence so as to allow better correlation with in-use barrier performance.【英文标准名称】:Milk-Determinationofnitrogencontent-Part4:Determinationofthenon-protein-nitrogencontent(ISO8968-4:2001);GermanversionENISO8968-4:2001
【原文标准名称】:牛奶.氮含量测定.第4部分:无蛋白质氮含量测定
【标准号】:DINENISO8968-4-2002
【标准状态】:现行
【国别】:德国
【发布日期】:2002-06
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:化学分析和试验;数学计算;抽样方法;定义;乳制品分析;原蛋白质;分段法;实验室试验;分析;含量测定;试验;空白样品;奶制品;过滤;氮;基耶达尔;食品检验;食品;食品;精密度;牛奶;窒塞量;含量;质量浓度;滴定法
【英文主题词】:
【摘要】:
【中国标准分类号】:X16
【国际标准分类号】:67_100_10
【页数】:11P;A4
【正文语种】:德语