基于虚拟仪器温室灌溉控制系统的研究

农业电气化与自动化硕士学位论文基于虚拟仪器温室灌溉控制系统的研究姓名：何亚非申请学位级别：硕士专业：农业电气化与自动化指导教师：董桂菊20090605V21131/4——40%1/2PCLabVIEWMATLABSimulinkMATLABLabVIEWVIAStudyonIrrigationControlSystemofGreenhouseBasedonVirtualInstrumentAbstractWiththearrivalofthe21stcentury,waterresourcescrisishasbecomeaglobaloutstandingissuetowhichpeoplepaymoreandmoreattentionallovertheworld.Ourcountryisoneof13countriesinworldwhicharesufferingfromshortageofwater,andhaslessthanaquarteroftheworld'saveragepercapitawatercapacity.Whilethewaterresourceisfacedwithshortage,thewasteofwaterisveryseriousinthedepartmentofagriculturewhichconsumesthemostofwaterinChina.Atpresent,theutilizationrateofagriculturalirrigationwaterisonlyabout40%,whichislessthan1/2ofthatindevelopedcountries.Thereforethedevelopmentofwater-savingirrigationtechnologyandimprovementoftheutilizationrateofagriculturalirrigationwateristheonlywaytosolvetheproblemofshortageofwaterresourceinfutureaswellasthebasicrequirementofmodernagriculture.Thepremiseofformingtheformationofagriculturewithefficientuseofwatermustbethetransformationofagriculturalirrigationtechnologyinchina.Facilityagricultureisanimportantcomponentofmodernagriculture.Developmentofgreenhousewater-savingirrigationtechniqueshasagreatsignificanceforimprovingtheutilizationrateofagriculturalwater.Thetechnologyofthegreenhousewater-savingirrigationisstillinitsearlystages,lowautomationlevelandshorthistory.Theoverwhelmingmajorityofdomesticgreenhouseequipmentsarerelativelysimple,andthegreenhouseirrigationisstillmanuallybasedontheexperienceofthetraditionalirrigationmethodswhichhasrestrictedtheimprovementofproductionandqualityofgreenhousecrops.Thearticleaimsatdesigningasetofcontrolsystemwhichcanautomaticallymonitorthesoilhumidityofgreenhousecropsgrowth,whichcouldirrigatethecropstimelywithaproperquantityofwater,andalsoplayaroleofhighlyefficientirrigation,watersaving,andenergy-saving.Inthispaper,wemainlyresearchthedripirrigationcontrolsystemofgreenhousebasedonvirtualinstrumenttechnology,whichconsistsoftherelationsofsoilhumidityandirrigationquantityandtheirrigationcontroltechnologyandeachpartofsoftwareandhardwareofsystemequipment.Thesensortechnique,computerinformationtechnology,virtualinstrumenttechnologyanddatabasetechnologyareorganicallycombinedbycomparingthevirtualinstrumentwiththetraditionalinstrument.Theoverallplanofsystemisthatsensor’shumiditysignalsweregatheredandtransmittedtoPCComputerbythedataacquisitioncard,thenPCComputerisusedashostcomputertooutputcontrolsignalstoirrigationactuatoraftercalculation,treatmentandfuzzyAbstractVIIdecision.Thesignalstorageanddemonstrationarerealizedatthesametime.Intermsofhardware,equipmentselectionandperformanceindicatorsaredescribedindetail,andtheirrigationvalvedrivecircuitisalsodesigned.Inthesoftwareaspect,theLabVIEWvirtualinstrumentisusedasthedevelopmentplatformandthemodulardesignmethodisadoptedinordertorealizethedetectionsignalreal-timegain,thegatheringinformationrealtimedisplay,dataprocessing,thecontrolsignalaccurateoutput,soundwarningandgatheringsignaldatamanagementfunctionandsoon.Intermsofcontrolalgorithm,consideringcharacteristicofthegreenhouseenvironmentsystemwhichconsistsofnonlinear,time-variant,timedelay,theprecisemathematicmodelwashardlytobeestablished.Thefuzzycontrolmethodisadoptedtorealizethecontrolofthegreenhouseirrigationsysteminthepaper.Thefuzzycontrolisanonlinearcontrolsystem,whichhasexcellentrobuststabilityandpoorsensitivetothechangeofsystemparameters.ThedesignoffuzzycontrollerandtheformationofthefuzzycontrollistarerealizedbyemployingMATLABsoftwareinthispaper,andthefuzzycontrollerissimulatedbyapplyingSimulinksoftware.Finally,theirrigationsystemcanmeettherequirementsofdesignbythedripirrigationexperimentKeywords:SavingWaterIrrigation;VirtualInstruments;FuzzyControl;MATLAB;LabVIEW;DatabaseCandidate:HeYafeiSpeciality:AgriculturalElectrizationandAutomatizationSupervisor:AssociateProf.DongGuiju111.1197219771.4×104km320001.38×109km397.5%(1.345×109km3)2.5%0.01%200240%8026200270%507%22%2.8×1012m32.7×1012m32200m31/410912000m31/2200136.5%36%54.4%81%45.3%64.1%19%517m31/51/20206004001106×109m350%~150%0.3~0.40.7~0.90.87kg/m32.32kg/m321.45kg/m3201.22030205020021.2.1207080WayneClyma2001CO250kmAlonTal,20063DOSATRON/2.7×104km22×104km2Anonymous20031.2.220502004208090208021.2hm290%22%2116202.1×106hm2198030016m220%2005GPRS1.451234LabVIEW51.5622.12.1.1PXIGPIBVXIPLC2004CRT1986NATIONALINSTRUMENTSTMNIThesoftwareistheInstrument——20022-120082-1Tab.2-1Contrastofvirtualinstrumentandtraditionalinstrument1~25~10720081PCPCI/O23I/O4OLEDDEIntranetIntranet2006/GPIBVXI90Geomatics1996——LabVIEWGoldsmith1997MicrosoftWindowsCASA1996AT-MIO-1619992.1.2I/ODAQIEEE488GPIBPVXIPXI2006.20088I/O/I/OPCIGPIBIEEE488.2VXIPXI2-12003GPIBVXIPXIPCPCDAQI/O2-1Fig.2-1Virtualinstrumentstructure1PCIPCIPeripheralComponentInterconnectPCPCIPCIPCPCIA/DDAQ/IMAQA/DD/AI/O/PCPC20052GPIBGPIBGeneralPurposeInterfaceBusHP70GPIBPCGPIB9GPIBGPIBGPIBGPIB3VXIVXI——VMEVIRFI/EMIVXIVXI20044PXIPXIPCIExtensionsforInstrument