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Smith自抗扰控制器在过程时滞系统中的应用.docx

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Smith自抗扰控制器在过程时滞系统中的应用 Abstract: Smithpredictor(SP)isawell-establishedcontrolstrategyusedtomitigatetheeffectsoftimedelayinprocesscontrolsystems.ThispaperhighlightstheapplicationofSPcontrolfortimedelaysystemsinprocesscontrol.TheSPcontrolstrategyisdiscussedindetail,includingitsbasicprinciples,advantages,andlimitations.ThepaperalsopresentsthedesignstepsinvolvedinimplementingtheSPcontroller.TheeffectivenessoftheSPcontrolstrategyisdemonstratedthroughpracticalexamplesandsimulationstudies.Finally,somefutureresearchdirectionsareoutlinedbasedonthecurrentstateoftheartofSPcontrol. Introduction: Timedelayisacommonphenomenoninprocesscontrolsystems,whichcanleadtopoorsystemperformanceandinstability.Itiscausedbythetimetakenforasignaltotravelthroughthesystemfromtheinputtotheoutput.Theeffectoftimedelaybecomesmoresignificantasthefrequencyoftheinputincreases.Therefore,itisessentialtohaveaneffectivecontrolstrategytotackletimedelayinprocesscontrolsystems. TheSmithpredictor(SP)isacontrolstrategythatiswidelyusedtoovercometheeffectsoftimedelayinprocesscontrolsystems.ItwasfirstintroducedbyOwenSmithin1957andhassincebecomeapopularcontrolmethodduetoitssimplicityandeffectiveness.ThispaperdiscussestheapplicationofSPcontrolintime-delaysystemsinprocesscontrol. Smithpredictorcontrolstrategy: ThebasicideaoftheSmithpredictorcontrolstrategyistoestimatethefutureoutputofthesystembasedonthecurrentinputandpastprocessdata.Theestimateofthefutureoutputisthenusedtogeneratethecontrolsignal,whichisappliedtothesystem.Thisapproachcaneffectivelycompensatefortheeffectsoftimedelayintheprocesscontrolsystem. TheSPcontrolstrategyconsistsoftwomajorcomponents,theprimarycontrolloop,andtheestimator.Theprimarycontrolloopisresponsibleforgeneratingthecontrolsignalbasedontheestimatedprocessoutput.Theestimator,ontheotherhand,estimatesthefutureprocessoutputusingpastprocessdataandthecurrentinput.Theestimatedprocessoutputisthenusedtocalculatethecontrolsignalintheprimarycontrolloop. TheadvantagesofSmithpredictorcontrol: TheSmithpred