潍城区公开选拔年轻干部到基层挂职.ppt

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1、DOE-basedAutomaticProcessControlwithConsiderationofModelUncertainties1JanShiandJingZhongTheUniversityofMichiganC.F.JeffWuGeorgiaInstituteofTechnologyOutlineIntroductionDOE-basedAutomaticProcessControlwithConsiderationofModelUncertaintyProcessmodelControl

2、objectivefunctionControllerdesignstrategiesSimulationandcasestudySummary2ProblemStatementProcessvariationismainlycausedbythechangeofunavoidablenoisefactors.Processvariationreductioniscriticalforprocessqualityimprovement.OfflineRobustParameterDesign(RPD)u

3、sedatthedesignstageTosetanoptimalconstantlevelforcontrollablefactorsthatcanensurenoisefactorshaveaminimalinfluenceonprocessresponsesBasedonthenoisedistributionbutnotrequiringonlineobservationsofnoisefactorsOnlineAutomaticProcessControl(APC)duringproducti

4、onWiththeincreasingusageofin-processsensingofnoisefactors,itwillprovideanopportunitytoonlineadjustcontrolfactorstocompensatethechangeofnoisefactors,whichisexpectedtoachieveabetterperformancethanofflineRPD.3MotivationofUsingAPC4x=x1enoisedistributiony(x,e

5、)abOnlineadjustXbasedonex=x2Offlinefixx=x2Offlinefixx=x1TheObjectiveandFocus5DOE-BasedAPCDesignofExperiments(DOE)AutomaticProcessControl(APC)StatisticalProcessControl(SPC)Theresearchfocusesonthedevelopmentofautomaticprocesscontrol(APC)methodologiesbase

6、donDOEregressionmodelsandreal-timemeasurementorestimationofnoisefactorsforcomplexmfgprocessesLiteratureReviewForcomplexdiscretemanufacturingprocesses,therelationshipbetweentheresponses(outputs)andprocessvariables(inputs)areobtainedbyDOEusingaresponsesurf

7、acemodel,ratherthanusingdynamicdifferential/differenceequationsofflinerobustparameterdesign(RPD)(Taguchi,1986)Improverobustparameterdesignbasedontheexactleveloftheobserveduncontrollablenoisefactors(Pledger,1996)ExistingAPCliteraturearemainlyforautomaticc

8、ontrolofdynamicsystemsthataredescribedbydynamicdifferential/differenceequations.CertaintyEquivalenceControl(CEC)(Stengel,1986):Thecontrollerdesignandstateestimatordesignareconductedseparately(Theuncertaintyofsystemstatesis