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基于TDC的工作辊窜辊控制
TRC-BasedWorkRollBouncingRollControl
Introduction:
Therollingmillisanimportantequipmentinthemetalprocessingindustry.Itisusedtoconvertbilletsoringotsintosheets,bars,orothershapesrequiredbythedownstreamindustry.Rollingmillbounceisanimportantfactoraffectingtherollingqualityandproductionefficiency.Rollingmillbouncingreferstoakindofvibrationphenomenonthatoccurswhentheworkrollbouncesontherollingstripduringtherollingprocess.Thisbouncingphenomenacancausetheworkrolltorolloutsideofthedesiredrollingstrip,causingharmtothestripandtherollitself.Inthispaper,wewilldiscusstheTDC-basedworkrollbouncingrollcontroltosolvethisproblem.
TheTDC-BasedWorkRollBouncingRollControl:
Theworkrollbouncingphenomenoncanbeexplainedastheself-excitedvibrationresponseoftheworkrollandthestrip.Therearemanyreasonsfortheoccurrenceofworkrollbouncing,suchastheunevennessofthestrip,thedeviationofthestripcenterline,theeccentricityoftheroll,andsoon.Duetothecomplexityandunpredictabilityoftherollingprocess,itisdifficulttodeterminetheexactmechanismofworkrollbouncing.Therefore,itisnecessarytouseacontrolsystemtosuppressworkrollbouncing.
TheTDC(TimeDelayControl)isakindofnonlinearcontrolmethodthatiswidelyusedinthecontrolofcomplexanduncertainsystems.TheTDCmethodusesthedelayedstatefeedbacktosuppresstheself-inducedvibrationofthesystem.TheworkrollbouncingcontrolsystembasedontheTDCmethodisshowninthefigurebelow.
Thecontrolsystemconsistsofthreeparts:themeasurementandsynchronizationunit,theTDCcontroller,andtheactuator.Themeasurementandsynchronizationunitincludesastripthicknessgaugeandapositionsensor,whichcanmeasurethethicknessandcenterlinepositionofthestripinreal-time.TheTDCcontrollercalculatesthecontrolsignalbasedonthemeasureddataandthedelayeddatatosuppresstheworkrollbouncing.Theactuatorisusedtoadjusttherollgapandtherolleccentricitytoeffectivelysuppresstheworkrollbouncing.
TheworkingprincipleoftheTDC-basedworkrollbouncingrollcontrolcanbedescribedasfollows:
Firstly,themeasurementandsynchronizationunitmeasuresthethi