NF P10-203-1/A2-2007 DTU20-12.屋顶和防水的砖石工程.屋顶用防水覆盖层的砖石工程结构.第1部分:技术规范

上一篇: NF P41-213-1-1-2007 建筑工程.未增塑的聚氯乙烯管道装置.废水排水系统.第1-1部分:技术规范
下一篇: NF P67-103-1-1-2007 活动地板(自由拼接).组成部件.实施.第1-1部分:技术规范

Product Code:SAE J452
Title:General Information-Chemical Compositions, Mechanical and Physical Properties of SAE Aluminum Casting Alloys
Issuing Committee:Metals Technical Executive Steering Committee
Scope:The SAE Standards for aluminum casting alloys cover a wide range of castings for general and special use, but do not include all the alloys in commercial use. Over the years, aluminum alloys have been identified by many numbering systems as shown in Table 1. Presently, SAE is recommending the use of the UNS Numbering System to identify these materials. The castings are made principally by sand cast, permanent mold, or die cast methods; however, shell molding, investment casting, plaster cast, and other less common foundry methods may also be used. If the alloys listed do not have the desired characteristics, it is recommended that the manufacturers of aluminum castings be consulted.【英文标准名称】:Acceptancecodeforgearunits-Testcodeforairbornesound
【原文标准名称】:齿轮装置验收规程.空气中噪声试验规程
【标准号】:BSISO8579-1-2002
【标准状态】:现行
【国别】:英国
【发布日期】:2002-08-30
【实施或试行日期】:2002-08-30
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:空气(载)声;噪声(环境的);声试验;噪声测量;声学测量;试验条件;声学试验;试验;试验;齿轮箱;测定;齿轮;验收规范;声级
【英文主题词】:Acceptancespecification;Acousticmeasurement;Acoustictesting;Airbornesound;Determination;Gearboxes;Gearwheels;Noise(environmental);Noisemeasurements;Soundlevels;Testing;Testingconditions;Tests
【摘要】:ThispartofISO8579specifiestheinstructionsandstandardizedconditionsnecessaryforthedeterminationoftheairbornesoundemissionofgearunitsandgearmotors.Italsospecifiestheallowedmeasurementmethods,togetherwiththeoperatingandmountingconditionsusedforthetest.Theemissioncharacteristicsincludeemissionsoundpressurelevelsatspecifiedpositionsandthesoundpowerlevel.Thedeterminationofthesequantitiesisnecessaryfora)manufacturersofgearunitsorgearmotors,inorderthattheymaybeabletodeclaretheemittedsound,b)forcomparingthesoundemittedbygearunitsandgearmotorsunderserviceoperation,andc)forthepurposeofnoisecontrolatthedesignstage.ThispartofISO8579hastheaimofensuring,withitsuse,thereproducibilityofthedeterminationoftheairbornesoundemissioncharacteristicswithinspecifiedlimitsdeterminedbythegradeofaccuracyofthebasicmeasurementmethodused.ThesoundmeasurementmethodsallowedbythispartofISO8579areengineeringmethods(grade2)andsurveymethods(grade3).
【中国标准分类号】:J17
【国际标准分类号】:17_140_20;21_200
【页数】:62P;A4
【正文语种】:英语