canbemapped.Aftertheanalysis,thetransferfunctionofthecontrolledobjectcanbedefined.Intheprocessofexperiment,theobjectwasconductedseveraltests.UsingRSLogixtrendmonitoringfunctioncurve,morethanchargedobjectstepresponsecurvehavebeenrecorded.Toalltheparametersforaverage,steadytime:ts≈.s,steadyvalue:h(∞)=.,peaktime:tp=.sovershoot:a}.Accordingtothetheoreticalanalysis,thecontrolledobjectisthemostlikelysecond-orderobject.However,thedifferenceisveryapparentbetweentheidealsecond-ordercontrolledobjectstepresponsecurveandtheactualcurves.Sotheidealcurvecan'tresponsetoitsactualcharacteristics.Itisinferredthatthecontrolledobjectmaybethesecond-ordercontrolledobjectthatincludeszero.ThetryanderrormethodandMATLABsimulationtoolsareusedtogetacurvewhoseparametersareclosetotheaveragedynamicparametersofthecontrolledobject'sresponsecurve.ItisshowninFig..Someadjustmentscanbemadeaccordingtothefollowingrules:)Whenthezeroisclosertotheimagina回路锅炉液位值调整被选定为研究对象。
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