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1、Chapter111IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter112IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter113IntroductiontoStatisticalQualityControl,5thEditionbyDoug
2、lasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.11-1ProcessMonitoringandRegulationSPChasalonghistoryofsuccessfuluseindiscretepartsmanufacturingIncontinuousprocesses,engineering process control(EPC)schemesareoftenusedtoreducevariabilityEPCschemesarebasedonadjustmentofsomemanipulatable process vari
3、ableforprocess compensation and regulationSPCisappliedwhereweassumethatprocesscanbebroughtintostatisticalcontrol“Statisticalcontrol”meansonlystablerandomvariationisobservedaroundtheprocesstargetOnceincontrol,aprocesswillstaythereforarelativelylongperiodoftimeHowever,insomeindustrialsettings,processm
4、ayhaveatendencytodriftorwanderawayfromtargetThereisconsiderableinterestincombiningthesetwostrategiesthatis,enhanceEPCtoenabledetectionofassignablecause-typedisturbancesTheneedforintegratingEPCandSPCisoftenquestionedStatisticalframeworkforEPCisparameter estimationStatisticalframeworkforSPCissimilarto
5、hypothesis testingHowever,reduction of variabilityisacommonobjectiveofbothstrategiesChapter114IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter115IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005J
6、ohnWiley&Sons,Inc.Chapter116IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter117IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter118IntroductiontoStatisticalQualityContro
7、l,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter119IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1110IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,
8、Inc.Chapter1111IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1112IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1113IntroductiontoStatisticalQualityControl,5thEditio
9、nbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1114IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1115IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Moreon
10、EngineeringControlEngineeringcontrollerscannotalwaysbeusedtoeliminatecorrelationProcessdynamicsmaynotbeunderstoodwellenoughAnyengineeringcontrolleressentiallytransfersvariabilityfrompartoftheprocesstoanotherInexample,variabilitywastransferredfrommolecularweightintocatalystfeedweightThismaynotalwaysb
11、eanacceptablealternativeChapter1116IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1117IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1118IntroductiontoStatisticalQual
12、ityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1119IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1120IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnW
13、iley&Sons,Inc.Chapter1121IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1122IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1123IntroductiontoStatisticalQualityControl
14、,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Only5adjustmentsaremadeoverthe50observationsFigure11-12isaplotoforiginalunadjustedoutputvariable,adjustedoutput,EWMAforecasts,andactualprocessadjustmentsVariabilityinadjustedoutputaroundtargethasbeenreducedbymorethan50%Chapter1124In
15、troductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.IntegralControlChapter1125IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.ProportionalIntegral(PI)ControlChapter1126IntroductiontoStatis
16、ticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.ProportionalIntegralDerivative(PID)ControlChapter1127IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.11-3CombiningSPCandEPCControlchartisnotalwaysbestmeth
17、odforreducingvariabilityaboutatargetEngineeringcontroltheoryaccomplishesprocessadjustmentthrough1.Predictingnextobservationonprocess2.Manipulatingsomeothervariabletoaffectprocessoutput3.KnowingeffectofmanipulatablevariableContrastedwithSPCwhereprocessadjustmentistakenonlyonout-of-controlsignalEPCmak
18、esnoattempttoidentifyassignablecausesSubstantialprocessimprovementmayoccuriffeedbackcontrolisusedwithcontrolchartsforstatistical process monitoringSomerefertocombinedEPCandSPCsystemsasalgorithmic SPCChapter1128IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005Jo
19、hnWiley&Sons,Inc.Chapter1129IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1130IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1131IntroductiontoStatisticalQualityCont
20、rol,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1132IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1133IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&So
21、ns,Inc.Chapter1134IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1135IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.Chapter1136IntroductiontoStatisticalQualityControl,5thEditionbyDouglasC.Montgomery.Copyright(c)2005JohnWiley&Sons,Inc.