基于LabVIEW虚拟仪器平台的外文翻译Word格式文档下载.docx

基于LabVIEW虚拟仪器平台的外文翻译Word格式文档下载.docx

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WeusedLabVIEW,NITestStand,andPXItobuildaprototypetodemonstratethatthenewsystemcannotonlyusemoderntestequipmentandmethods,butwithoutsacrificingfunctionalityunderthepremiseofthecurrenttestsystemcostisonlyasmallpart."

VickieHoffmann,OrbisInc.

LabVIEWgraphicsofsignalprocessingplatformbysyllabarysignalprocessing,andanalysisandmathematicsoperationsfunctioncompositionofsignalprocessingandmathematicsfunctionlibrarycomposition,containsWavelettransform,andtime-frequencyanalysis,andimageprocessing,andfilterdesign,andsoundandvibration,andsystemidentification,andRFanalysis,professionalmethodoftoolpackage,whilecompatible.mfile,mathematicsscriptlanguageandfunctioninterface,mayandNIhardwareofseamlesscombination,makesalgorithmgetfastvalidationanddeployment.LabVIEWsignalprocessingplatformhasbeensuccessfullyusedinelectronics,telecommunications,electricalandmechanical,chemical,medical,aerospace,physicsandotherfieldsofteachingandresearchwork.

Challenge

BasedVERSAmoduleEuropeanstandardbus（VMEbus）testequipmentisoftenusedsubmarinesystem,verifywhetherthemoduleisinitssub-componentscanbereadytouse（readyforissue,RFI）staterequirestheuseoflarge,complex,andlaboratoryenvironmentstestingequipment,andrequiresallthesub-componentsofthemoduleinaunifiedcenterfortesting.

Solution

UsecompacttheNIPXImodularinstruments,LabVIEWsoftwareandNITestStandtodevelopandVMEbustestequipmenttestfunctionwiththesamemilitarytestsystems,whilesignificantlyreducingthesize,reducecomplexityandcosts,sothattheNavycanbedeployedinthetestsystemstrategiclocation,andreduceoverallmaintenancecostsandsubmarinefleetlogisticscosts.

OrbisInc.（Orbis）isacompanywith130employeesofsmallbusinesses,isheadquarteredinthestateofSouthCarolinainCharleston.ItscorebusinessistheU.S.DepartmentofDefense（DoD）toprovideengineeringandprojectmanagementservices.Orbisisalsocommittedtoconductcutting-edgeresearchanddevelopmentprojects,focusingondevelopinginnovativeautomatedtestsystems（ATS）.

Tomeetmilitaryneeds

CriticaloperationalsystemsandsupportsuitemanysystemsbasedonVMEtechnology.Thesesystemsmaintenanceandtroubleshootinginvolvessub-assembliesbetweenthemoduleandtheRFIsparepartsareinterchangeable.Systemtroubleshootingproceduresuseanyofthemodulesmustbere-testedandverifiedbeforetheycanreturntoRFIstatusandkeptasaspare.Asthetraditionalsystem,alltestswerecarriedoutinacentralposition,thetotalcostofownershipwillincrease.Inadditiontothecostoftransportmodule,anothermajorcostfromthepartstomaintainsufficientinventorytoreplacebeingtestedandthecomponentsduringtransport.

BasedontheautomatedtestingandfunctionaltestingfortheU.S.DepartmentofDefensetowritecodefortheexperience,theNavyfoundOrbistohelpthemdevelopacompact,flexibleandcanmeetorexceedtheexistingtestsystemsfunctionalprototypetestsystem.Wehavesuccessfullybuiltaprototypetodemonstratethenewsystemcannotonlyusemoderntestingequipmentandmethods,andinthepremisewithoutsacrificingfunctionalitytestsystemscurrentlycostonlyasmallpart.

FromtheNIPXImodularinstrumentstofindsolutions

Byusingthestand-aloneinstrumentsandmodularinstrumentsforcomparingvarioussolutions,wedecidedtousePXImodularinstrumentationplatform,becauseweneedacompactandflexibletestsystem.Next,weanalyzedthesuppliers,choseNIPXIdevicesasthesolesupplierbecausethecompanyistheleaderinPXI,NIoffersawiderangeofPXImodulestomeettheneedsofourtestsystemsandtechnicalrequirements,theThecompanyalsoprovidesa"

plugandplay"

environment.PXIplatformforourdevelopmentprovidesagoodstart,becauseNIModulesandLabVIEWtoensurethatalldevicescancommunicatewithouthavingtocreatecustomdevicedrivers.

WeusetwoNIPXI-2531moduletocreatean8×

128crosspointswitchmatrixtothePXImeasurementmoduleconnectedtoallpointsonthemassinterconnectinterfacetestadapters（ITA）.Withthisswitchmatrix,wehavetoconnecttotheITADUT（UUT）toachievefullfunctionaltestconfigurationsalltherequiredconnections.Additionally,wewillVMEinterfaceisintegratedintothetestsystemandconnectittotheITA,whichprovidesforeachUUTcomprehensiveVMEbustest.

IntegratedNIPXIandLabVIEW,NITestStand

WeprimarilywritteninLabVIEWandNITestStandtestsystemstestassembly.Byeliminatingtheneedtowritecustomdrivers,NIsoftwaregreatlysimplifiesthehardwareandsoftwaresystemsintegration.Afterstartingtheprogram,LabVIEWwillcalleachPXImodulesforself-testoperation,checkthecalibrationdateisvalid,andthenthefunctionaltests.EachtestwritteninLabVIEW,NITestStandtocallintheexecution.Theendofthetestexecution,thetestwillbebasedonthecollecteddataandgenerateareadablereportcanbeexportedinXMLformat.

NITechnologyList

OurapplicationthroughtheNIPXI-8108embeddedcontrollertoachievethemanagementtasksthroughtheNIPXI-6653andNIPXI-6651moduletocontrolthetimingandsynchronization.Fortheconnection,cyclecomputingandcommunications,weuseNIPXI-7813Rtoachievedataintegration,NIPXI-7853RmoduleprocessconnectionandsignalprocessingaswellasNIPXI-7854Rmoduleforsignalprocessing.

Inordertodevelopthecurrentstabilizationsystem,weuseNILabVIEW2010software,LabVIEWFPGAModuleandtheLabVIEWReal-TimeModule.DevelopmentprocesslargelydependsontrainingandNILabVIEWvolumelicenseagreement.

ChangingviewsonCompactATS

OrbiswillPXI-basedtestsystemwithacustomITAandVMEinterfacescombinedesignandbuildaprototypecalledCompactTestertestsystem.CompactTesterwith12cubicfeetof18-slotPXIchassistestsystemreplacesthe84cubicfeetoftestsystems.Comparedwiththeprevioustestsystems,costreductionof3times,15timessmallerfootprint,weight25times,thisdifferenceisverysignificant.Inaddition,theuseofindustry-standardPXIhardwareandLabVIEWsoftware,wewerealsoabletoreducethedailyoperationandmaintenancecosts.

InadditiontoachievingallthegoalssetfortheCompactTester,thePXI-basedsystemalsohasotheradvantages.Interconnectionduetothesizeandmassreduction,therebycompletingthenumberofcablesrequiredforeachtestissignificantlyreduced.Whichinturnallowsustoreducethecablecanacquiremorerealsignals,greatlyimprovingtheaccuracyofeachmeasurement.

WithLabVIEW,NITestStandandNIPXImodularinstruments,OrbisCompactTesterquicklydevelopedaprototypetodemonstratetheNavy.Navytestnewfunctionalityprovidedbythesystem,thepotentialcostsavings,aswellasreducingsignalnoiseRFIsparesreturnedtotheTreasurytoreducethetimeandotheradvantagescooing.

Multithreadedprogrammingchallenge

Todate,theprocessortechnologyinthefieldofinnovationhasmadeyourcomputerisworkingathigherclockspeedofthecentralprocessingunit（CPU）.However,astheclockrateapproachingitstheoreticalphysicallimitswithmultiple（ratherthanindividual）amongthenewprocessorsareintheresearchanddevelopmentofnuclear.Takeadvantageofthesenewmulticoreprocessorforautomatedtestapplicationsusingparallelprogrammingtechniques,youcanachievethebestperformanceandhighestthroughput.DrEdwardLee-theUniversityofCalifornia,Berkeley,distinguishedprofessorofelectricalandcomputerengineeringdepartment--describeparallelprocessingtechnology.

ManytechnologyexpertspredictedthatresponsewillbetheendofMoore'

sincreasinglyparallelcomputerarchitectures.Ifwewanttocontinuetoimproveperformance,computerprogramsmustbeabletotakeadvantageoftheparallelism.”

Also,takeadvantageofmulti-coreprocessorapplicationprogrammingisahugeprogrammingchallenges,andthisiswidelyaccepted.--MicrosoftfounderBillGates--aboutthischallengehasthispassage:

Tofullyharnessthepowerofparallelprocessors,...Softwaremustbeabletodealwithconcurrencyissues.But,asanywritingmulti-threadedcodedevelopertellyouthat,thisisoneofthemostdauntingtasksinthefieldofprogramming.”

Waslucky,LabVIEWformulticoreprocessorsprovideanidealprogrammingenvironment,becauseitprovidesavisualenvironmentforcreatingparallelalgorithm,anditcanbedynamicallyassigningmultiplethreadstoagivenapplication.Infact,theuseofautomatedtestapplicationsformulti-coreprocessors,caneasilybeoptimizedtoobtainthebestperformance.Moreover,PXIemodularinstrumenttoenhancethistechnicaladvantage,becausethePCIebushighdatatransferratespossible.FrommulticoreprocessorsandPXIedevicestwospecificapplicationsare:

multichannelsignalanalysisandonlineprocessing（hardwareintheloop）.Inthesubsequentsectionsofthisarticle,wewillexaminethevariousparallelprogrammingtechniques,characterizationandperformanceadvantagesassociatedwitheachtechnology.

基于LabVIEW用于军用潜艇系统组件的紧凑型测试系统

“我们采用LabVIEW、NITestStand和PXI来构建原型，以证明新系统不仅可以利用现代化测试设备和方法，而且在无需牺牲功能的前提下成本仅为当前测试系统的一小部分。

”

VickieHoffmann,OrbisInc.

LabVIEW图形化信号处理平台由千余个信号处理、分析与数学运算函数组成的信号处理与数学函数库组成，包含小波变换、时频分析、图像处理、滤波器设计、声音与振动、系统辨识、RF分析等专业方法的工具包，同时兼容.m文件等数学脚本语言与函数接口，可与NI硬件的无缝结合，使算法得到快速验证与部署。

LabVIEW信号处理平台已成功应用于电子、通讯、机电、医疗、航空航天、物理、化工等多个领域的教学和科研工作。

基于VERSAmodule欧洲标准总线（VME总线）的测试设备通常被用于潜艇系中，验证其子组件模块是否处于可随时投入使用（readyforissue,RFI