JB/T 6301-1992 煤的磨损指数 测定方法
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基本信息
| 标准名称： | 煤的磨损指数 测定方法 |
| 中标分类： |
机械 >>
活塞式内燃机与其他动力设备 >>
锅炉及其辅助设备 |
| 发布部门： | 哈尔滨电站设备成套所 |
| 发布日期： | 1992-06-26 |
| 实施日期： | 1993-01-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 2011-08-15 |
| 归口单位： | 哈尔滨电站设备成套所 |
| 出版日期： | 1900-01-01 |
| 页数： | 8 页 |
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所属分类： 机械 活塞式内燃机与其他动力设备 锅炉及其辅助设备
【英文标准名称】:StandardTestMethodforAirflowResistanceofAcousticalMaterials
【原文标准名称】:吸音材料的气流阻力器的试验方法
【标准号】:ASTMC522-2003(2009)e1
【标准状态】:现行
【国别】:美国
【发布日期】:2003
【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】:E33.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:absorption;acousticalmaterials;airflowresistance;airflowresistivity;Absorption;Acousticaltests;Airflowperformance;Airflowresistance;Airflowresistivity;Soundtransmission--buildingmaterials/applications
【摘要】:Thespecificairflowresistanceofanacousticalmaterialisoneofthepropertiesthatdetermineitssound-absorptiveandsound-transmittingproperties.Measurementofspecificairflowresistanceisusefulduringproductdevelopment,forqualitycontrolduringmanufacture,andforspecificationpurposes.Validmeasurementsaremadeonlyintheregionoflaminarairflowwhere,asidefromrandommeasurementerrors,theairflowresistance(R=P/U)isconstant.Whentheairflowisturbulent,theapparentairflowresistanceincreaseswithanincreaseofvolumevelocityandthetermx201C;airflowresistancex201D;doesnotapply.ThespecificairflowresistancemeasuredbythistestmethodmaydifferfromthespecificresistancemeasuredbytheimpedancetubemethodinTestMethodE384fortworeasons.Inthepresenceofsound,theparticlevelocityinsideaporousmaterialisalternatingwhileinthistestmethod,thevelocityisconstantandinonedirectiononly.Also,theparticlevelocityinsideaporousmaterialisnotthesameasthelinearvelocitymeasuredoutsidethespecimen.1.1Thistestmethodcoversthemeasurementofairflowresistanceandtherelatedmeasurementsofspecificairflowresistanceandairflowresistivityofporousmaterialsthatcanbeusedfortheabsorptionandattenuationofsound.Materialscoverarangefromthickboardsorblanketstothinmats,fabrics,papers,andscreens.Whenthematerialisanisotropic,provisionismadeformeasurementsalongdifferentaxesofthespecimen.1.2Thistestmethodisdesignedforthemeasurementofvaluesofspecificairflowresistancerangingfrom100to10000mksrayls(Pax00B7;s/m)withlinearairflowvelocitiesrangingfrom0.5to50mm/sandpressuredifferencesacrossthespecimenrangingfrom0.1to250Pa.Theupperlimitofthisrangeoflinearairflowvelocitiesisapointatwhichtheairflowthroughmostporousmaterialsisinpartialorcompletetransitionfromlaminartoturbulentflow.1.3AprocedureforaccreditingalaboratoryforthepurposesofthistestmethodisgiveninAnnexA1.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4.1Table1isprovidedforusertoconvertintocgsunits.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q25
【国际标准分类号】:91_120_20
【页数】:5P.;A4
【正文语种】:英语
MIL-F-16884J, MILITARY SPECIFICATION: FUEL, NAVAL DISTILLATE (31 MAY 1995) [S/S BY MIL-PRF-16884K]., This specification covers one grade of Naval distillate fuel: (NATO symbol F-76).
