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英文原文AUTOTESTINGSYSTEMFORFANPERFORMANCEBASEDONVIRTUALINSTRUMENTATIONTECHNOLOGYABSTRACTINACCORDANCEWITHTHEPRESENTSTATUSOFMEASUREMENTOFFANPERFORMANCEWITHBURDENSOMEINLABORS,LOWINACCURACYANDBACKWARDINTESTINGMETHOD,AUTOTESTINGSYSTEMFORFANPERFORMANCEBASEDONVIRTUALINSTRUMENTSVITECHNOLOGYWASDEVELOPEDTHESYSTEMINTEGRATEDSENSORTECHNOLOGY,COMPUTERTECHNOLOGYANDMEASUREMENTTECHNOLOGYASARESULT,THESYSTEMCANNOTONLYAUTOMATICALLYACQUIRE,PROCESSTESTINGDATAANDEXPRESSTHEFINALRESULTSINSUITABLEFORMSBUTALSOCONTROLANDADJUSTDIFFERENTWORKINGLOADSTHEWHOLESYSTEMISFRIENDLYININTERFACE,EASYINOPERATIONANDCOMPLETEINFUNCTIONSTHEEXPERIMENTRESULTSSHOWEDTHATTHESTABILITYOFTHEEXPERIMENTPROCESSINCREASED,THEREADINGERRORWASAVOIDEDANDTHEMEASUREMENTACCURACYANDEXPERIMENTEFFICIENCYWEREIMPROVEDTHESYSTEMHASBEENWIDELYAPPLIEDTOMANYFANPRODUCTIONFACTORIESANDRESEARCHINSTITUTESKEYWORDSFAN；PERFORMANCETESTING；AUTOTESTING；VIRTUALINSTRUMENTATION；DATAPROCESSING1INTRODUCTIONTHEPARAMETERSOFFANFLUX,PRESSURE,POWERANDEFICIENCYNOTONLYDECIDEWORKINGPERFORMANCEBUTALSOARETHEBASISOFSELECTINGANDUSINGBLOWERFORPEOPLEBECAUSEOFTHEBLOWERTHEORYBEINGNOTPERFECT,PERFORMANCETESTINGISTHEMAINMETHODOFACQUIRINGTHESEPARAMETERSMOREOVER,THETESTINGISIMPORTANTFORTESTINGPRODUCTSANDDESIGNINGNEWPRODUCTSINCHINA,TRADITIONALFANPERFORMANCETESTINGISALWAYSDONEMANUALLYORBYSINGLECHIPWHICHHASMANYSHORTAGESINCLUDINGLOWERPRECISION,HEAVYLABORINTENSITY,UNFRIENDLYUSERINTERFACE,ANDSOONTHEREFORE,ACCORDINGTOTHEDEMANDSOFMODERNTIMESEXPERIMENTTECHNIQUE,ANAUTOMATICTESTANDANALYSISSYSTEMFORFANPERFORMANCEBASEDONVIRTUALINSTRUMENTATIONTOOLLABWINDOWS/CVIWASDESIGNEDINTHISPAPERCOMBINEDSENSORTECHNOLOGY,COMPUTERTECHNOLOGYANDTESTINGTECHNIQUE,THEVIRTUALINSTRUMENTATIONVITECHNOLOGYMAKESTHEMOSTUSEOFINTELLIGENCEOFCOMPUTERTOTHOROUGHLYBREAKDOWNTHEMODETHATTHETRADITIONALINSTRUMENTSAREDEFINEDBYTHEMANUFACTURERS,HOWEVERTHEUSERSCANNOTCHANGEWITHVI,USERSAREPROVIDEDASPACETOEXERTTHEIRCAPACITYANDIMAGINATIONADEQUATELYITISTHEUSER,NOTTHEMANUFACTURER,WHOCANDESIGNTHEIROWNINSTRUMENTSYSTEMATTHEIRPLEASUREACCORDINGTOPERSONALNEEDINTHEVIRTUALINSTRUMENTSYSTEM,THEHARDWAREONLYPROVIDESASOLUTIONTOTHEINPUTANDOUTPUTOFSIGNALS,HOWEVERTHESOFTWAREISTHEKEYTOTHEWHOLESYSTEMANYUSERMAYMODIFYTHESOFTWARETOCHANGE,INCREASEORDECREASETHEFUNCTIONSANDSCALESOFTHEINSTRUMENTSYSTEMASARESULT,THESYSTEMCANNOTONLYAUTOMATICALLYACQUIRE,PROCESSTESTINGDATAANDEXPRESSTHEFINALRESULTSINSUITABLEFORMSBUTALSOCONTROLANDADJUSTDIFFERENTWORKINGLOADSTHEWHOLESYSTEMISFRIENDLYININTERFACE,EASYINOPERATIONANDCOMPLETEINFUNCTIONSTHEEXPERIMENTRESULTSHAVESHOWNTHATTHESTABILITYOFTHEEXPERIMENTPROCESSHASINCREASED,THEREADINGERRORWASAVOIDEDANDTHEMEASUREMENTACCURACYANDEXPERIMENTEFFICIENCYWEREIMPROVEDTHESYSTEMHASBEENWIDELYAPPLIEDTOMANYFANPRODUCTIONFACTORIESANDRESEARCHINSTITUTES2HARDWAREDESIGNOFTHESYSTEMHARDWAREOFTHISSYSTEM,WHICHISTHEBASISOFSIGNALACQUISITION,CONVERSION,ENHANCEANDPROCESSING,CONSISTSOFFAN,MOTORS,WINDPIPE,SENSORS,COMPUTER,DATAACQUISITIONBOARD,FREQUENCYCONVERSIONGOVERNOR,ETCTHEBLOCKDIAGRAMOFSYSTEMSTRUCTUREISSHOWNINFIG1AMONGTHOSECOMPONENTS,COMPUTERANDPLUGINDAQBOARDPLAYANIMPORTANTROLEINTHESYSTEMWITHTHEHIGHPERFORMANCEDAQBOARD,NOTONLYDATAACQUISITION,A/DCONVERSIONBUTALSOFREQUENCYCONTROL,STEPMOTORCONTROLETCAREREALIZEDCONSIDEREDOFTHETECHNICALINDEXESSUCHASSAMPLINGFREQUENCY,ACCURACY,A/DD/ACONVERSIONRATE,RESOLUTION,THEDAQBOARDPCI6024EFROMNATIONALINSTRUMENTSUSA,WITHWHICH200KS/S,12BITPERFORMANCEON16SINGLEENDEDANALOGINPUTSCANBEGOTUPTO,ISSELECTEDTHE6024EFEATURESDIGITALTRIGGERINGCAPACITY,ASWELLASTWO24BIT,20MHZCOUNTER/TIMES；AND8DIGITALI/OLINESTWO12BITANALOGOUTPUTSAREALSOFEATUREDBYTHE6024ETHEFANPARAMETERSFLUX,STATICPRESSURE,TORQUEANDROTATIONSPEEDAREMEASUREDBYCORRESPONDINGSENSORSINCLUDINGDIFFERENTIALPRESSURETRANSMITTERBC69TYPE,ACCURACYISFS,STATICPRESSURETRANSMITTERJYBTYPE,ACCURACYIS1FS,ANDTORQUEROTATESPEEDSENSORAKC205TYPE,ACCURACYIS03FSTHESENSOROUTPUTSAREALLSTANDARDCURRENTSIGNALWITH420MATOMEETTHEDAQBOARDINPUTSIGNALTYPEANDRANGE,05VVOLTAGESIGNALSAREACHIEVEDFROM420MACURRENTSIGNALSBYANINTERFACEBOARDWHICHISUSEDFORSIGNALTRANSFORMATIONTHROUGHTHEANALOGOUTPUTCHANNELON6024E,05VVOLTAGESIGNALWHICHISCORRESPONDINGON050HZOFACFREQUENCY,ARESENTOUTTOCONTROLFREQUENCYCONVERTERFRA54015KCHTYPE,MITSUDISHI,JAPANTHEN,THEFANSPEEDCHANGESWITHVARIABLEVOLTAGETHEREGULATINGUNITOFWORKINGSTATUS,WHICHISDESIGNEDBYTHEAUTHORS,ISTHEROTATINGBAFFLESTRUCTURECOMPOSEDOFROUNDBAFFLE,SHAFTCOUPLING,CREEPERGEARANDSTEPMOTORETCSEETHEFIG2THISKINDOFSTRUCTURECANNOTONLYREALIZETHEAUTOCONTROLBUTALSOISSMALLANDFLEXIBLETHREEDIGITALI/OPORTONTHE6024EAREUSEDTOSENDOUTTHREEPHASEPULSETOCONTROLTHEROTATIONANGLEOFSTEPMOTORTHESTEPMOTORDRIVESTHEROUNDBAFFLETHROUGHTHECREEPERGEARTOREVOLVEINSIDETHEWINDPIPE,RESULTINGINTHECHANGEOFAPERTUREGAPBETWEENTHEROUNDBAFFLEANDWINDPIPE,THEREBYALTERINGTHEFLUXOFAIRFLOWINSIDETHEWINDPIPE,NAMELYTHEALTERATIONOFWORKINGSTATUSISREALIZEDTHECREEPERGEARCANPREVENTTHEPOSITIONOFROUNDBAFFLECHANGINGWHENTHEAIRFLOWISTOOSTRONGTOINSURETHEMEASUREMENTACCURACY,SEVERALANTIINTERFERENCEMEANSAREADOPTEDSUCHASDIFFERENTIALINPUTSOFSIGNALSTOELIMINATETHECOMMONMODEINTERFERENCE,GOODEARTHOFSIGNALLINEANDINSTRUMENTS,DIGITALFILTERINGTECHNOLOGYINSOFTWARE3SOFTWAREDESIGNOFTHESYSTEM31DATAPROCESSINGDATAPROCESSINGINTHISSYSTEMINCLUDESTHREEASPECTSPROCESSINGACQUIREDSIGNALSTOWEEDOUTVARIOUSDISTURBINGSIGNALS；USINGHYDRODYNAMICSFORMULASTOCALCULATEPERFORMANCEPARAMETERSOFFANS；FITTINGPERFORMANCEPARAMETERSBASEDONLEASTSQUAREMETHODTODRAWPERFORMANCECURVESOFFANS311CALCULATIONOFPERFORMANCEPARAMETERSREFERTOTHENATIONALSTANDARDGB123685,AERODYNAMICSPERFORMANCETESTPROCEDUREOFVENTILATOR,THEVENTILATORPERFORMANCETESTINGOFTHEDISCHARGEOUTLETISACHIEVEDTHEFANPERFORMANCEPARAMETERSARECALCULATEDASFOLLOWSOWHEREISTHEAPERTUREOFRESTRICTIONORIFICE；ISTHEFLOWCOEFFICIENT；ΕISTHEGASEXPANSIONCOEFFICIENT；ΡISTHEGASDENSITYOFFANOUTLET；FITTHETORQUEBETWEENMOTORANDFAN；NISTHEROTATIONSPEEDOFMOTOR；PSTISTHESTATICPRESSURE；PDISTHEKINETICPRESSURE；AISTHEAREAOFWINDPIPE；VISTHESPEEDOFTHEAIRFLOW；ΗISTHEAVAILABLEOUTPUT312PERFORMANCECURVEFITTINGTHEREAREMANYCURVEFITTINGMETHODSSUCHASEXPONENTIALFITTING,ORTHOGONALPOLYNOMIALFITTINGTHELEASTSQUAREMETHODISADOPTEDTOFITPERFORMANCEPARAMETERSBECAUSETHECHARACTERISTICCURVEOFFANISMOSTLYPARABOLAWHATISCALLEDLEASTSQUAREMETHODISSTATISTICALLYPROCESSINGTHEOBSERVEDVALUESFROMEXPERIMENTSTOMAKEDESIREDVALUEOFOBSERVATIONEQUALTOITSTHEORETICALVALUEANDRECTIFYTHEOBSERVEDVALUEUSINGTHEFUNCTIONPOLYNOMIALTHATISINTHEADVANCEDANALYSISLIBRARYOFLABWINDOWS/CVI,THEPERFORMANCECURVEFITTINGWASCOMPLETEDTHEFORMATOFFUNCTIONPOLYNOMIALISASFOLLOWSPOLYNOMIALDOUBLEX,DOUBLEY,INTN,INTORDER,DOUBLEZ,DOUBLECOEF,DOUBLEMSETHEPURPOSEOFTHISFUNCTIONISTOFINDTHECOEFFICIENTSTHATBESTREPRESENTTHEPOLYNOMIALFITOFTHEDATAPOINTSX,YUSINGTHELEASTSQUARESMETHODPOLYFITOBTAINSTHEITSELEMENTOFTHEOUTPUTARRAYANDMEANSQUAREDERRORMSEUSINGTHEFOLLOWINGFORMULAWITHTHISFUNCTIONTHEFLUXWHOLEPRESSURECURVE,FLUXSTATICPRESSURECURVE,ANDFLUXEFFICIENCYCURVECANBEACHIEVED32STRUCTUREOFTHESOFTWARETHESOFTWAREISDEVELOPEDBYLABWINDOWS/CVIWHICHISANINTEGRATEDANSICENVIRONMENTFORENGINEERSANDSCIENTISTSCREATINGVIRTUALINSTRUMENTATIONAPPLICATIONSWITHINTEGRATEDI/OLIBRARIES,ANALYSISROUTINES,ANDUSERINTERFACETOOLS,LABWINDOWS/CVIDELIVERSEVERYTHINGYOUNEEDFORBUILDINGADVANCEDTESTANDMEASUREMENTSYSTEMSBASEDONMODULARDESIGNMETHODOFPROGRAM,8MODULESAREDESIGNEDINTHISSYSTEM1BASICPARAMETERSSETTINGUSERCANKEYINTHEFANTYPEANDENVIRONMENTALPARAMETERSINCLUDINGATMOSPHERICTEMPERATURE,HUMIDITYANDPRESSUREINTHISMODULE2DATAACQUISITIONANDCONTROLPARAMETERSSETTINGINTHISMODULE,THESAMPLINGCHANNEL,CONTROLCHANNEL,SAMPLINGRATE,SIGNALINPUT/OUTPUTLIMITETC3MAINCONTROLSTATIONTHISMODULEISTHEMAININTERFACEFOROPERATORSTHEVISUALIZEDCONTROLS,SUCHASPOWERSWITCH,TESTINGSTARTSWITCH,OPERATINGMODESELECTINGSLIDE,FANSPEEDSELECTINGSLIDE,ANDREALTIMENUMERICWAVEFORMDISPLAYOFSIGNALS,AREDELIVEREDINTHEFRONTPANELFORUSEROPERATINGTHISSYSTEMCONVENIENTLY4DATAPROCESSINGINTHISMODULE,NOTONLYORIGINALDATABUTALSOCALCULATEDDATAINCLUDINGFLUX,EFFICIENCY,POWERANDTOTALPRESSURECANBESHOWNINNUMERICANDWAVEFORMFORMMOREOVER,BASEDONLEASTSQUAREMETHODTHEFANPERFORMANCECURVECANBEFITTEDWITHFREESELECTEDFITMODULE5TESTREPORTAFTERTEST,OPERATORSCANACHIEVETHETESTREPORTINCLUDINGGRIDORGRAPHTYPEOFTESTDADAINTHISMODULEALSO,DATASAVING,PRINTING,EXPORTING,IMPORTINGETCAREALLREALIZED6HISTORYQUERYACCORDINGTOTHETESTNUMBERANDFANTYPE,USERSCANFINDHISTORYRECORDSTHEYNEEDWITHNUMERICORGRAPHTYPEDOCUMENTSINTHISMODULETHUS,ANEEDEDTESTREPORTINCLUDINGFANPERFORMANCECURVECANBEDISPLAYEDANDPRINTED7EXPERIMENTALSIMULATIONAVISUALFLASHFILMISDESIGNEDFOROPERATORTOKNOWTHEOPERATINGPROCEDUREWELL8SYSTEMHELPUSINGTHEHYPERTEXTTECHNOLOGY,THESYSTEMHELPONLINEISBUILTWHICHCONSISTSOFTHREEPARTS,NAMELY,FANPERFORMANCETESTSYSTEMOVERVIEW,BACKGROUNDKNOWLEDGEANDOPERATINGINSTRUCTION
