虚拟仪器外文翻译.docx

虚拟仪器外文翻译.docx

《虚拟仪器外文翻译.docx》由会员分享，可在线阅读，更多相关《虚拟仪器外文翻译.docx（19页珍藏版）》请在冰豆网上搜索。

虚拟仪器外文翻译

LabVIEW

1．overview

LabVIEWisaprogramdevelopmentenvironment,bythenationalinstruments（NI）researchanddevelopmentcompany,similartotheCandBASICdevelopmentenvironment,butwithothercomputerlanguageLabVIEWsignificantdifferenceis:

othercomputerlanguageisbasedonthetext,andthelanguagecodeofgraphicalLabVIEWusescriptinglanguageGprogram,applicationisintheformofblockdiagram.

Acomplete,LabVIEWvirtualinstrumentsystemofopenapplicationsoftwaredevelopment,anduseittoforminstrumenttestingsystemanddatacollectingsystemcansimplifythedesignprocedure.WithVisualC++LabVIEW,VisualBasic,LabWindows/CVI,etc,whichadoptsdifferentprogramminglanguageisbasedonthetextlanguageprogramCode（Code）,andabVIEWLisusinggraphicalprogramminglanguage）,Graphic（GinsteadofthetraditionaldiagramoftheCode.TheLabVIEWofequipmentwiththescientistsandengineersiconinthehabitofbasicagreement,thismakestheiconprogrammingprocessandthinkingprocessisverysimilar.

LabVIEWconvenientcallsWindowsDLLanduser-definedfunctionintheDLL,LabVIEWalsoprovidesCIN（C）NodewithanyuserscanusebyC++languageor,iftheANSIC,compiledprogrammodules,makesaopenLabVIEWdevelopmentplatform.LabVIEWalsodirectlysupportdynamicdataexchange（DDE）,structuredquerylanguage（SQL）,TCPandUDPnetworkprotocol.Inaddition,theLabVIEWalsoprovidesspecialusedforprogramdevelopmentkit,userscaneasilysetbreakpoints,dynamicprogramexecutiontoveryintuitiveimageobservationdatatransmissionprocess,andconvenientdebug.

TheoperationmechanismisLabVIEWmacroeconomicsenseisnolongerthevonneumanntraditionallycomputersystemstructureofthemethod.Thetraditionalcomputerlanguage（suchasC）totheorderofexecutionbyparallelstructureinLabVIEWmechanism;Essentially,itisakindofcontrolFlowstructurewithgraphicalDataFlowpattern（DataFlowMode）,thiskindofmeanstoensuretheprocessofanyNodeFunctioninhirethoseknowledgeableprogrammersonlyafterallitcanonlybeexecutedData.

Thatistosay,inthedataflowintheconceptofprogramexecution,anditisthedatadrivenbyoperatingsystem,calculatemachineandsoon.

SinceLabVIEWprogramisdataflowdriven,dataflowdesignprogram,agoalonlywhenit'sallinputcanonlybeeffective,Andthegoalofoutputonlywhenitiscomplete.So,inVIEWoftheLabisconnectedthedataflowbetweennodesfunctioncontrolprogramexecutionsequence,anddon'tliketextprogramexecutionsequencebyrowsofconstraint.Thus,wecanbeconnectedthroughtherapiddevelopmentofconcisefunctionnodeapplications,evencanhavemultipledatasynchronizationoperationchannel,theso-calledMultithreading（Multithreading）.

2．DataStorageandReportingwithNILabVIEW

Thecontinuedincreaseinprocessingandstoragecapacityandthedecreaseofhardwareandsoftwarecostshasresultedinanexplosionofcollecteddatabeingacquired.Butwhiletechnologyisenablingfasterandricherdataretention,storing,managing,andsharingdataremainstherealchallenge.Traditionalsoftwarepackagestendtotakeoneoftwolimitingapproaches:

1）theyforceyouintoaparticularformatthatisnotexchangeablewithotherapplicationsorusersor2）savingdataisleftsoopenendedyouwastetimetryingtodeterminethebestwaytoorganizeandsaveyourdatatodisksoyoucanshareit.

NILabVIEW,designedfortheentireengineeringprocess,includesbuilt-infunctionalitytohelpyoueasilysavedatatodiskandcreateprofessionalreports.ByprovidingeasyyetrobustinterfacesforfileI/Oandreporting,youcanmakethemostofyouracquireddatatomakedecisionsfaster.

（1）FileI/ODesignedSpecificallyforEngineeringData

DespitethefactthatLabVIEWoffersawidevarietyoffileI/Ooptions,thesetraditionalfiletypesrarelymeetallthecriteriayouneedinafileformat.Forexample,ASCIIfilesareexchangeable,butareverylargeandslowtoreadandwrite.Ontheotherhand,binaryfilereadandwritespeedscankeepupwithhigh-speedhardware,butaredifficulttosharewithothers.

Becauseofthedrawbacksoftraditional fileI/O,NationalInstrumentsdevelopedtheTechnicalDataManagementStreaming（TDMS）fileformattomeetthespecificneedsandhighdemandsofengineersandscientists.TDMSfilesarebasedontheTDMdatamodelforsavingwell-organizedanddocumentedtestandmeasurementdata.TheTDMdatamodeloffersthreelevelsofhierarchy,asshowninFigure2–file,group,andchannel.Thefilelevelcancontainanunlimitednumberofgroups,andeachgroupcancontainandunlimitednumberofchannels.Becauseofthischannelgrouping,youcanorganizeyourdatatomakeiteasiertounderstand.Forexample,youmayhaveonegroupforyourrawdataandanothergroupforyour