智能PID的研究及其在液位控制中的应用

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1、安徽农业大学硕士学位论文智能PID的研究及其在液位控制中的应用姓名：葛薇申请学位级别：硕士专业：农业机械化工程指导教师：朱张青20080601AbstractPIDcontroliswidelyusedinindustrialprocesscontrolsystemsforitssimplestructureandgoodadaptability．However,withtherapidlydevelopmentofmanufacturinglevelandsciencetechnology，the

2、moderncontrolsystemsbecomemorecomplicatedandsystematic，anditisdi伍cultforconventionalPIDcontroltoobtainthesatisfiedcontrolquality．IntelligentControl，asabrand—newfieldofautomaticcontrol，providessuchcomplexuncertainproblemanewwaywithitsadvancedandinnovati

3、vethought．Inrecentyears，intelligentPIDcombinedbyintelligentcontrolandPIDcontrolissoattractiveandhasbeeneffectivelyusedinactualproduction,whichshowsthebroaddevelopmentprospect．田1epaperselecttwomajorbranchesofintelligentcontrol—_f畸controlandneuralnetwork

4、controlforstudy．乃eformerisrobustandgoodatdealingwiththestructuralknowledgewithouttheobject’Sprecisemathematicmodel，whilethelatterhastheprimaryadvantageofself-learning，approachinganyarbitraryfunctionandparallelprocessing．OntheBasisofintroducingbasicprin

5、cipleandparameterstuningmethodsofPIDcontrolindetail，abouthowtoeffectivelyintegrate晒control，neuralnetworkwithtraditionalPIDcontrolisexploredpositivelyandseveralcontrolprojectsarealsosummedup．Thepaperfocuses011fuzzyself-tuningPIDandPIDbasedonimprovedBPne

6、uralnetworkwhichgetthemostextensiveapplication．Capabilitiesoftrackingtargets，anti—disturbance，fittingtochangingprocessmodelandotheraspectsarestudiedbysimulationbasedonMA7n，AB／Simulink．髓esimulationcurvesshowthatbothcontrolmethodsareobviouslysuperiortoco

7、nventionalPID．Finally，thespecificmethodusingIntelligentPIDcontrolintypicalindustrialprocesses--levelsystemisstudicd．BasedontheNanjingUniversityprocesscontrollaboratoryCS4000e，【perimentmdevice，selectthedual—capacitywatertankastheobject,andconsiderthebel

8、owwatertanklevelasthecontrolgoal．PID，fuzzyself-tuningPIDstrategyareadoptedseparatelytocontrolwatertanklevelinreal—time．Itanalysestherespectivecontrolqualitythoroughly．Boththesimulationandtheexperimentalresultindicatethatfuzzyself-tuning