外文翻译---LabVIEW的测量和数据分析.docx
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外文翻译---LabVIEW的测量和数据分析.docx
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LabVIEWforMeasurementandDataAnalysis
LabVIEWisthetoolofchoiceduetoitsunparalleledconnectivitytoinstruments,powerfuldataacquisitioncapabilities,naturaldataflow-basedgraphicalprogramminginterface,scalability,andoverallfunctioncompleteness.
Introduction
Usersgenerallystarttheirworkbyacquiringdataintoanapplicationorprogram,becausetheirtaskstypicallyrequireinteractionwithphysicalprocesses.Inordertoextractvaluableinformationfromthatdata,makedecisionsontheprocess,andobtainresults,thedataneedstobemanipulatedandanalyzed.Unfortunately,combininganalysiswithdataacquisitionanddatapresentationisnotalwaysastraightforwardprocess.Applicationsoftwarepackagestypicallyaddressonecomponentoftheapplication,butseldomaddressallaspectsandneedstogettoacompletesolution.LabVIEWwasdesignedtoaddresstherequirementsforastart-to-finish,fully-integratedsolution,sothatcustomerscanseamlesslyintegrateallphasesoftheirapplicationinasingleenvironment.
Figure1.LabVIEWVirtualInstrumentBlockDiagram
Whiletherearemanytoolsthatindependentlyaddresseachoftherequirements,only
LabVIEWcombinesallofthemwiththepowerofgraphicalprogrammingandstate-of-the-artdataacquisitionhardware,usingthepowerofyourPC.Itisthecombinationofdataacquisition,dataanalysis,andpresentationofresults,thattrulymaximizesthepowerofVirtualInstrumentation.Avirtualinstrumentconsistsofanindustry-standardcomputerorworkstationequippedwithpowerfulapplicationsoftware,cost-effectivehardwaresuchasplug-inboards,anddriversoftware,whichtogetherperformthefunctionsoftraditionalinstruments.ThisiswhyapplicationsandprogramsbuiltwithLabVIEWarereferredtoasVI(virtualinstruments).
Asanengineering-focusedtool,LabVIEWmakeshundredsofanalysisfunctionsavailableforresearchers,scientists,andengineers,aswellasstudentsandprofessors.Theycanbuildthesefunctionsrightintotheirapplicationstomakeintelligentmeasurementsandobtainresultsfaster.
ChoosingtheCorrectMethodforAnalysis
Usersincorporateanalysisintotheirapplicationsandprogramsindifferentways.Therearecertainconsiderationsthathelpdeterminethewayinwhichanalysisshouldbeperformed.
Inlinevs.Offlineanalysis
Inlineanalysisimpliesthatthedataisanalyzedwithinthesameapplicationwhereitisacquired.Thisisgenerallythecasewhendealingwithapplicationswheredecisionshavetobemadeduringruntimeandtheresultshavedirectconsequencesontheprocess,typicallythroughthechangingofparametersorexecutingofactions.Thisistypicallythecaseincontrolapplications.Whendealingwithinlineanalysis,itisimportanttoconsidertheamountofdataacquiredandtheparticularanalysisroutinesthatareperformedonthatdata.Aproperbalancemustbefoundbecausetheycouldeasilybecomecomputationallyintensiveandhaveanadverseeffectontheperformanceoftheapplication.
Otherexamplesforinlineanalysisareapplicationswheretheparametersofthemeasurementneedtobeadaptedtothecharacteristicsofthemeasuredsignal.Onecaseiswhereoneormoresignalsneedtobelogged,butthesechangeveryslowlyexceptforsuddenburstsofhigh-speedactivity.Inordertoreducetheamountofdata
logged,theapplicationwouldhavetoquicklyrecognizetheneedforahighersamplingrate,andreduceitwhentheburstisover.Bymeasuringandanalyzingcertainaspectsofthesignalstheapplicationcanadapttothecircumstancesandenabletheappropriateexecutionparameters.Althoughthisisonlyoneexample,therearethousandsofapplicationswhereacertaindegreeofintelligence-theabilitytomakedecisionsbasedonvariousconditions-andadaptabilityarerequired,whichcanonlybeprovidedbyaddinganalysisalgorithmstotheapplication.
Decisionsbasedonacquireddataarenotalwaysmadeinanautomatedmanner.Veryfrequently,thoseinvolvedwiththeprocessneedtomonitortheexecutionanddeterminewhetheritisperformingasexpectedorifoneormorevariablesneedtobeadjusted.Althoughitisnotuncommonforuserstologdata,extractitfromafileordatabaseandthenanalyzeitofflineto modifytheprocess,manytimesthechangesneedtohappenduringruntime.Inthesecases,theapplicationmusthandlethedatacomingfromtheprocess,andthenmanipulate,simplify,format,andpresentthedatainawaythatitismostusefultotheuser.LabVIEWuserscanthentakeadvantageofthemanyvisualizationobjectstopresentthatdatainthemostconciseandusefulmanner.
LabVIEWoffersanalysisandmathematicalroutinesthatnativelyworktogetherwithdataacquisitionfunctionsanddisplaycapabilities,sothattheycanbeeasilybuiltintoany application.
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