基本信息
标准名称: | 冲模挡料和弹顶装置 第6部分:扭簧弹顶挡料装置 |
英文名称: | Stock stopping and spring units of stamping dies-Part 6:Stop sets with torsional spring |
中标分类: |
机械 >>
工艺装备 >>
模具 |
ICS分类: |
机械制造 >>
无屑加工设备 >>
模制设备和铸造设备
|
替代情况: | 替代JB/T 7649.6-1994 |
发布部门: | 中华人民共和国国家发展和改革委员会 |
发布日期: | 2008-02-01 |
实施日期: | 2008-07-01 |
首发日期: | |
作废日期: | |
提出单位: | 中国机械工业联合会 |
归口单位: | 全国模具标委会 |
起草单位: | 桂林电器科学研究所;桂林电子科技大学 |
起草人: | 翁史振、廖宏谊、奉双 |
出版社: | 机械工业出版社 |
出版日期: | 2008-06-01 |
页数: | 8页 |
书号: | 15111·8991 |
适用范围
JB/T 7649的本部分规定了冲模扭簧弹顶挡料装置的尺寸规格和标记。 本部分适用于冲模扭簧弹顶挡料装置。
前言
没有内容
目录
没有内容
引用标准
没有内容
所属分类: 机械 工艺装备 模具 机械制造 无屑加工设备 模制设备和铸造设备
【英文标准名称】:StandardTestMethodforObjectiveMeasurementofSpeechPrivacyinOpenPlanSpacesUsingArticulationIndex
【原文标准名称】:使用声音清晰度指数在开放式空间对谈话保密性进行客观量度的标准试验方法
【标准号】:ASTME1130-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E33.02
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:architecturalacoustics;articulationindex;fieldtest;openoffice;openofficesystem;open-planspace;speechprivacy;Acousticaltests;Ambientsoundpressurelevels;Attenuation;Bandfiltersets;Fieldtesting--soundtransmission;Filters/fil
【摘要】:Thespeechprivacybetweenlocationsinanopenplanspaceisdeterminedbythedegreetowhichintrudingspeechsoundsexceedtheambientsoundpressurelevelsatthelistener''sear;aclassicsignal-to-noiseratiosituation.Thesoundpressurelevelsatthelistener''searfromintrudingspeechdependupon:Theindividualvocaleffortandorientationofthetalker,Theattenuationofspeechsignalsduetodistanceorinterveningbarriers,andThereinforcementofspeechsignalsduetoreflectionsfromsurfacessuchastheceiling,furniturepanels,lightfixtures,walls,orwindows.Theambientsoundpressurelevelswilloftenbecontrolledtomaskintrudingspeech.Thisisaccomplishedbymeansofamaskingsoundsystem.However,incertainpositionsandfrequencyranges,heating,ventilating,orairconditioningequipment(HVAC)maycontributesignificantlytoambientsoundpressurelevels.TheprimarypurposeofthistestmethodistomeasurethespeechprivacyforanaveragespeechspectrumusingthestandardArticulationIndexmethod.Thisrequiresmeasurementoftherelevantacousticalcharacteristicsdiscussedin5.2and5.3forapairoflocationsandcalculationoftheArticulationIndexusinganaveragespeechspectrum.Theaveragespeechspectrumisformaletalkersspeakingwithnormalvoiceeffort.TheArticulationIndexrangesfrom0.00,wherespeechisunintelligible,to1.00,whereallindividualspokenwordscanbeunderstood.Cautionshouldbeexercisedininterpretingthenumericalresultsofthistestmethod.ThereisaneedforfurtherresearchtoestablishtherelationshipofArticulationIndextospeechprivacy.Onepurposeofthistestmethodistoencouragethemeasurementofdataandfurtherresearchonthistopicperhapsleadingtodevelopmentofwell-documentedspeechprivacycategoriesandcriteria.Thistestmethodcanbeusedto:Comparetherelativeprivacyaffordedbetweendifferentlocationswithinopenplanspaces.Evaluatehowchangesinopenplancomponents(barriers,furniture,ceilings,maskingsound,orwallpanels)affectspeechprivacy.Measurespeechprivacyobjectivelyforcorrelationwithsubjectiveresponses.Thistestmethodcouldbeoneelementofaperformanceoracceptancetestprocedure.However,manyadditionalitemswouldneedtobespecifiedtousethistestmethodforperformancetestingofanopenplanenvironment,suchas,thenumberoflocationstobetestedandmethodofselectingthoselocations,andthemethodofaveragingtheresults.SpecifyinganumericalcriterionintermsoftheArticulationIndexisalsonecessaryforacceptancetesting;however,theselectionofsuchacriterionandpermissibledeviationsshouldbeundertakenwithcareinviewofthepresentstate-of-the-artasdiscussedin5.5.1.1Thistestmethoddescribesameansofmeasuringspeechprivacyobjectivelybetweenlocationsinopenplanspaces.Thistestmethodreliesuponacousticalmeasurements,publishedinformationonspeechlevels,andstandardmethodsforassessingspeechcommunication.Thistestmethoddoesnotmeasuretheperformanceofindividualopenplancomponentswhichaffectspeechprivacy;itmeasurestheprivacywhichresultsfromaparticularconfigurationofcomponents(1,2).1.2Thistestmethodisintendedtobeafieldtestforthemeasurementofspeechprivacyinactualopenplanspaces.However,thistestmethodcouldbeusedinanenvironmentarrangedtosimulateanopenplanspace.1.3Thistestmethodissuitableforuseinmanyopenplanspacessuchasopenplanoffices,healthcarespaces,institutionalspaces,schools,etc.Itisnotapplicableformeasuringthespeechprivacybetweenopenplanandenclosedspacesorbetweenfullyenclo......
【中国标准分类号】:P31
【国际标准分类号】:17_140_01
【页数】:6P.;A4
【正文语种】:英语