约束理论TOC 毕业论文外文翻译

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1、附录ATheoryofConstraintAnoutputofasystemthatidentifiestheneedforandthetypeofactiontobetakentocorrectacurrentorpotentialproblem.ExamplesofactionmessagesinanMRPsystemincludereleaseorder,reschedulein,rescheduleout,andcancel.Inconstraintmanagement,theuseofnonconstraintresourcestomakepartsorprodu

2、ctsabovethelevelneededtosupportthesystemconstraint(s).Theresultisexcessivework-in-processinventoriesorfinishedgoodsinventories,orboth.Incontrast,thetermutilizationisusedtodescribethesituationinwhichnonconstraintresource(s)usageissynchronizedtosupporttheneedsoftheconstraint.1)Theclassificat

3、ionofquantitiesofitemsthathavebeenassignedtospecificordersbuthavenotyetbeenreleasedfromthestockroomtoproduction.Itisan"uncashed"stockroomrequisition.2)Aprocessusedtodistributematerialinshortsupply.2)Arouting,usuallylesspreferredthantheprimaryrouting,butresultinginanidenticalitem.Alternater

4、outingsmaybemaintainedinthecomputeroroff-lineviamanualmethods,butthecomputersoftwaremustbeabletoacceptalternateroutingsforspecificjobs.Thepercentageoftimethataworkerormachineiscapableofworking.TheformulaisAvailability=(S-B)*100%/SWhereSisthescheduledtimeandBisthedowntime.Thevolume/mixofthr

5、oughputonwhichfinancialbudgetsweresetandoverhead/burdenabsorptionratesestablished.Inthetheoryofconstraints,aprocessinwhichallexpeditinginashopisdrivenbywhatisscheduledtobeinthebuffers.Byexpeditingthismaterialintothebuffers,thesystemhelpsavoididlenessattheconstraintandmissedcustomerduedates

6、.Inaddition,thecausesofitemsmissingfromthebufferareidentified,andthefrequencyofoccurrenceisusedtoprioritizeimprovementactivities.Amaterialofvalueproducedasaresidualoforincidentaltotheproductionprocess.Theratioofby-producttoprimaryproductisusuallypredictable.By-productsmayberecycled,soldasi

7、s,orusedforotherpurposes.Thecapabilityofasystemorresourcetoproduceaquantityofoutputinaparticulartimeperiod.Theprocessofmeasuringproductionoutputandcomparingitwiththecapacityplan,determiningifthevarianceexceedspreestablishedlimits,andtakingcorrectiveactiontoget