溫室噴霧降溫機理與營養(yǎng)液調(diào)控系統(tǒng)優(yōu)化研究.pdf

1、中國農(nóng)業(yè)大學(xué)博士學(xué)位論文溫室噴霧降溫機理與營養(yǎng)液調(diào)控系統(tǒng)優(yōu)化研究姓名：李莉申請學(xué)位級別：博士專業(yè)：農(nóng)業(yè)電氣化與自動化指導(dǎo)教師：汪懋華20070601中國農(nóng)業(yè)人學(xué)博l‘學(xué)位論文摘要AbstractFogcoolingisoneofthemostefficientcoolingmethodsingreenhousoproductionduring羽nnmefBecauseoftheincreasinghumidityduringfogcoo

2、lingthismethodisconsideredtobeeffectiveforprovidingthemicroenvironmentsuitableforplantgrowthingreenhouses，improvingproductionefficiencyandincreasingeconomicprofiLClimateconm)linagreenhouseisdifficultboousetemperature，rel

3、ativehumidityandotherparametersallvmyTherefore，manystudieshavefocusedOnoptimizingcontroloftemperatureandrelativehumidityingreenhousesDripsystemsaIewidelyusedinsoillessculturebeoallSefertilizersagedissolvedinirrigationwat

4、ertoitllprovetheu∞effic／encyofwaterandfertilizersBythiswaynutritionsolutioncouldarriveatrootsdirectlythroughmanycapillariesandpipesIftheconcentrationsofnutritionelementsinirrigationwatcfarchigherthantheirsafevaluesforthe

5、plantsdamagecouldOObⅫll“totheplantsThusscientificformulationofnutrientsolutionandoptimizationofirrigationcon缸olarethekeytosoillesscultureToad蛔sthesekeyissues，thisstudywasconductedinthe‘KeyLabOilPrecisionAgricultureSystem

6、IntegrationResearch”ofChinaAgricaltureUniversityandatAgricultureUniversityofAthensinGreecewiththefinancialsupportoftheSinoCneececooperationproject‘InformationandCommunicationTechnologyforSustainable蛐OUSeProduction’Thethe

7、rmodynamicpropertiesofairinthefogcoolingandhumidifyingsystemwereanalyzedThedynamicmodelofthegreenhouseenvironmentandtheconservationequationofnM∞andal@rgyw@lepresentedThesystemofgreenhouseclimatecontrolwasdevelopedbased01

8、1alinearizationanddccouplingapproachtothenonlinearmodelandbyaddinglongtimeconstantstothesystem∞sp∞seforfiringplantresponseThemodelofformulationofnutrientsolutionsWaSstudiedandanalgorithmforautomaticnutr／entformulationwas

9、programmedtooptimizeimgationcontr01Finally，thehardwareandsoftwareforenvironmentcontrolandirrigationinthegleellhOtl$ewe∞developedSimulationandexperimentaltestswereperformeOtovalidatethemodelsandoptimizethecontrolalgorithm

10、sTheresultsofthesimulationandexperimemsshowedthatthefogcoolingsystemcouldproducedesiredtemperaturesandcorrelativerelativehumiditysetpoints，whichprovidedsuitableenvironmentconditionstothecropsinthegrOOllhOUSBTheresultsals

11、oindicatedthatthefeedbackfeedforwardapproachofthissystemcouldapprox／matethenon—linearizationrelationshipbylineatizationanddecouplingforclimatecontr01Moreover，theperformanceoftheproposedmethodologyforthecropmanagementsyst

12、emWaSrobustwiththedisturbanceseliminatedandsurgesreducedAndan0lmmizedprocessofnutrientsolutionformulationandirrigationcontrolwasrealizedKeywords：greenhouseo]imatecontrol，fogcooling，dynam／cmodel，linearizafionanddecoupling