自適應(yīng)模糊控制技術(shù)在營養(yǎng)液自動控制中的應(yīng)用研究.pdf

1、山東理工大學(xué)碩士學(xué)位論文自適應(yīng)模糊控制技術(shù)在營養(yǎng)液自動控制中的應(yīng)用研究姓名：孫霞申請學(xué)位級別：碩士專業(yè)：農(nóng)業(yè)機械化工程指導(dǎo)教師：馬明建20040501AbstractNutrients01ution’spreparationwasoneimportantfactorofsoillessculturewhichincludedadjustingandcontrollingthevaluesofelectricalconductivity，

2、pHaswellasdissolvedoxygenandtemperatureofnutrientsolution，anditdecidedtheyieldandqualityofVegetablesinthesameconditionTheparametersofnutrients01utionwerecharacterizedbythenonlinearityandtime—delayItwasdifncultfbrtheconve

3、ntionalcontrolmethodtogetsatis矗edeffectbecauseofthecomplicatyinbuildingmathematicmodel，whiIefuzzycontroIcouIdsatisfytherequirementsofthecomplicated，nonlinearsystemspeciallyThispaperfocusedontheapplicationresearchofself二a

4、daptiVefhzzycontrolmethodinnutrientsolutioncontrolsystemBytheoreticanalysisandsimulations，theinnuencesofvariousparametersandstructuresofself_adaptivefuzzycontrollertosystemperformancewerediscussed，andaselfadaptiVefuzzyco

5、ntrolmethod(sAFC)basedonselfadjustingofoutputscalingfactorandrulescaIingfactorwasproposedThefuzzycontrollerwhichcombinedwithintelligentsamplingswitchsettledtimedelayofnutrientsolution’spreparationeffectiVelyInthesvstem，d

6、ifkrentSAFCwerefulfilledTheexperimentresultsVeri^edthevaljdjtyofSFACdesignedinnutrientsolutioncontrolsystemTheexperimentresultsindicatedthatthedesignandrunningofthesystemwassatisfied，thecontrolofthesystemwassteadywithsma