BS 3087 Pt.5-1986 夹扭钳和剪断钳.第5部分:抓取与操纵用钳子尺寸规范

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下一篇: BS 3087 Pt.6-1986 夹扭钳和剪断钳.第6部分:工程技术人员和养路工人用钳子的尺寸规范

【英文标准名称】:Acoustics-Measurementofinsertionlossofductedsilencerswithoutflow-Laboratorysurveymethod
【原文标准名称】:声学.无气流管道消声器插入的损耗测量.实验室调查法
【标准号】:BSENISO11691-1997
【标准状态】:作废
【国别】:英国
【发布日期】:1997-03-15
【实施或试行日期】:1997-03-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:实验室试验;空调系统;性能;再现性;试验室;声强;试验设备;声学;噪声控制装置;声学测量;声学设备;频率;噪声控制;管廊;声源;调查;消声器
【英文主题词】:Acousticmeasurement;Acoustictesting;Acoustics;Airducts;Cables;Calibration;Canals;Checkingequipment;Classes;Definitions;Ducts;Enginesilencers;Flow;Insertionloss;Laboratorytesting;Laboratorytests;Loudspeakers;Measurement;Measurementcircuits;Measuringenvironment;Measuringequipment;Measuringtechniques;Microphones;Mineralwool;Noiseabatement;Precision;Reverberationrooms;Sonictesting;Sound;Soundmeters;Soundsources;Testresults;Testing
【摘要】:1GeneralThisInternationalStandardspecifiesalaboratorysub-stitutionmethodtodeterminetheinsertionlosswithoutflowofducted,mainlyabsorbent,circularandrectangularsilencers,aswellasotherductelementsforuseinventilatingandair-conditioningsystems.NOTE1LaboratorymeasurementproceduresforductedsilencerswithsuperimposedflowaredescribedinISO7235.ThisInternationalStandardisapplicabletosilencerswherethedesignvelocitydoesnotexceed15m/s.Asthemethoddoesnotincludeself-generatedflownoise,thisInternationalStandardisnotsuitablefortestsonsilencerswherethistypeofnoiseisofgreatimportancefortheevaluationofthesilencerper-formance.TheinsertionlossdeterminedaccordingtothisInter-nationalStandardinalaboratorywillnotnecessarilybethesameastheinsertionlossthatwillbeobtainedinaninstallationinthefield.Differentsoundandflowfieldsintheductwillyielddifferentresults.AsthisInternationalStandardrequiresregulartestducts,theresultsmayincludesomeflankingtransmissionviastructuralvibrationsintheductwalls,thatsetsanupperlimittotheinsertionlossthatcanbedeter-mined.NOTE2ISO7235givesmethodsfordeterminingthislimit.ThisInternationalStandardisintendedtobeusedforcircularsilencerswithdiametersof80mmto2000mmorrectangularsilencerswithcross-sectionalareaswithinthesamerange.2MeasurementuncertaintyExactinformationontheprecisionofthemethodcannotbegivenatthistime.ThereforethisInter-nationalStandardisdenotedasurveystandard.Interlaboratorytestsarenecessaryforthedetermi-nationofthestandarddeviationofreproducibility,σR,ofthemethod(relevanttermsandmethodsaregiveninISO5725-1).Itis,however,estimatedthatthismethodwillhaveaσRwhichiscomparabletothatofISO7235.Seetable1.
【中国标准分类号】:A42
【国际标准分类号】:17_140_99
【页数】:18P.;A4
【正文语种】:英语


Product Code:SAE AS1097
Title:Seal Ring, 37掳 Flared Tube Fitting End
Issuing Committee:G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
Scope:No scope available.