chap5 production planning and control

《chap5 production planning and control》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、ProductionPlanningandControlChapter5OperationsSchedulingChapter5OperationsSchedulingContentsIntroductionJobShopSchedulingTerminologySequencingRulesSequencingTheoryforaSingleMachineSequencingTheoryforMultipleMachinesAssemblyLineBalancingAdvancedTopicsforOperationssche

2、dulingIntroduction-WhatisOperationsScheduling?ImplementtheproductionordersgeneratedinMRPundergivenobjectives;Allocateproductionresources(machine,workersetal.)toproductionorders(jobsortasksandtheirduedates)inanoptimizedmanners;Theresultsaretimeallocationsofproductionr

3、esourcestodifferentjobs(jobsequencesoneachproductionresources);Alltheorderscanbecompletedwhileallproductionresourcesareutilizedwiththeirloadsbeingbalanced.ForecastoffuturedemandAggregateplanMasterproductionschedule(MPS)Scheduleofproductionquantitiesbyproductsandtimep

4、eriodMaterialRequirementPlanning(MRP)GenerateProductionordersandpurchaseorderOperationsSchedulingTomeetquantitiesandtimerequirementsforMRPIntroduction-ObjectivesofJobShopSchedulingObjectivesofoperationsschedulingMeetduedate;MinimizeWIPinventory;Minimizetheaverageflow

5、timethroughthesystems;Provideforhighmachine/worker(time)utilization(minimizeidletime);Reducesetupcost;MinimizeproductionandworkercostsDiscussion1)and3)aimatprovidingahighlevelofcostumerservice;2),4),5)and6)aretoprovideahighlevelofplantefficiency;Impossibletooptimizea

6、llaboveobjectivessimultaneously;Propertradeoffbetweencostandqualityisoneofthemostchallengingstrategicissuesfacingafirmtoday;Introduction-ObjectivesofoperationsSchedulingDiscussion(Cont.)Someoftheseobjectivesconflicts,e.g.ReduceWIPinventoryWorkeridletimemayincreaseor

7、machineutilizationmaydecrease;Reasons:differencesinthethroughputratefromonepartofthesystemtotheanothermayforcethefasteroperationstowait,ifthereisnobufferforWIPbetween1and2.Fig8-3AProcessComposedofTwoOperationsinSeriesIntroduction-FunctionsofSchedulingandControlisSFTh

8、efollowingfunctionsmustbeperformedinschedulingandcontrolashopfloorAllocatingorders,equipments,andpersonneltoworkcentersorotherspeci