集成制造系统网络的绩效管理【外文翻译】.doc

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1、原文：PerformanceManagementofIntegratedManufacturingSystemNetworksSukLee,AsokRay,KeumshikHong,JoongsunYoon,andMyungChuHan1.StructureofthePerformanceManagementProcedureNetworkperformance,morespecificallydelaysexperiencedbymessagepackets,couldbecriticalfordynamicperformanceandst

2、abilityofrealtimemanufacturingprocesses.Thisisespeciallytruewhenmultiplemachinesareperformingataskwithoutdirectconnectionsamongthem.Oneofthe

3、gethedesiredtablepositioncoordinatesandvariousmessagesforstatusreport.Anotherexampleismanipulationofabulkyandflexibleworkpiecebymorethanoneindependentrobotswhichinitiatetheirownprescribedtrajectoriesuponreceivingasignalfromacontrollerandreportthecompletionofthetrajectoriesb

4、acktothecontrollerviaanetwork.Thetimelinessofthetransmitteddataisessentialbecauseadelaycoulddamagetheworkpieceortherobotswristsandarms.Inordertomaintainanacceptablelevelofthedynamicperformanceandstabilityofvariousmanufacturingprocesses,performancemanagementisrequiredtomanip

5、ulateadjustableprotocolparametersinrealtimesothatthenetworkcanadaptitselftothedynamicenvironment.Thiscanbeaccomplishedintwosteps:(I)performanceevaluationtofindhowperturbationsinprotocolparametersaffectaselectedperformancemeasure,ie,todeterminetherelationshipbetweentheperfor

6、mancemeasureandtheprotocolparameters;(2)decisionmakingtodecideonhowtoadjustprotocolparameters,i.e.,toidentifythedirectionandmagnitudeoftheparameteradjustmentvector,utilizingpiecesofinformationprovidedinthefirststepandthehistoryofperformance.Theanalyticaltechniquesforperform

7、anceevaluationsuchasqueueingtheory(ViswanadhamandNarahari,1992)oftenrequiresunrealisticassumptionslikePoissonarrival,andtendtobemathematicallyuntractableasthestructureoftheperformancemeasurebecomescomplex.Furthermore,networktrafficstatisticssuchasdistributionsofmessagegener

8、ationintervalandmessagelength,whicharerequiredasinputstotheanalyticalmodel,arevery