DIN 4503-2-1993 照相机及其附件用三角架连接件.快速装配的连接件

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【英文标准名称】:StandardTestMethodforVelocityMeasurementsofWaterinOpenChannelswithRotatingElementCurrentMeters
【原文标准名称】:用旋转体流速计测量明渠中水的流速的标准试验方法
【标准号】:ASTMD4409-1995(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:1995
【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】:D19.07
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:dischargemeasurement;openchannelflow;waterdischarge;watervelocity;Acousticaltests;Dischargemeasurement;Openchannelflow--water;Waterdischarge/velocity;Watervelocity
【摘要】:Thistestmethoddescribesthedesignanduseofvarioustypesofcurrentmeters.Thesecurrentmetersarecommonlyusedtomeasurethevelocityatapointinanopenchannelcrosssectionaspartofavelocity-areatraversetodeterminetheflowrateofwater.TothisenditshouldbeusedinconjunctionwithTestMethodD3858.1.1Thistestmethoddescribesthedesignanduseofcup-typeorvane-typeverticalaxiscurrentmetersandpropeller-typehorizontalaxiscurrentmetersformeasuringwatervelocitiesinopenchannels.1.2Thistestmethodisintendedprimarilyforthosemeterscustomarilyusedinopen-channelhydraulic(asdistinguishedfromoceanographic)applicationswithanoperatorinattendance.1.3Thistestmethodisintendedprimarilyforcurrentmetersthatmeasureonecomponentorfilamentofflow.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A42
【国际标准分类号】:
【页数】:5P.;A4
【正文语种】:英语


Product Code:SAE J706
Title:Rating of Winches
Issuing Committee:Truck And Bus Power Take-Off Committee
Scope:This SAE Standard applies only to new winches which are primarily designed for intermittent pulls and lifts and whose configuration and condition are the same as when they were shipped by the manufacturer. They are not intended to be used in any manner for the movement of personnel. They may be driven by any power source recommended by the manufacturer and will be capable of being powered in either direction. They will be equipped with an automatic safety brake system to control a load when lowering under power and positively hold a load when power is not being delivered to the winch. A hydraulic flow control valve or similar device may be used in the brake system to control a load when lowering under power. A clutch to release the drum for 脪free-spooling脫 may be provided and will be designed not to disengage itself under load. A drag brake may be provided to control 脪free-spooling,脫 but will not be relied on to control or hold a load. Power sources, such as hydraulic motors, even though they may be supplied or recommended by the winch manufacturer, are not considered a part of the winch so far as this document is concerned, except to whatever extent they are a part of the brake system.