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The software generates several reports as a result of a simulation run 21 The Arena Window Fig 21 The Arena window After Arena starts the computer screen shows the Arena window Figure 21 shows what the Arena window typically looks like This is the a ID: 36351 Download Pdf
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Presentation on theme: "Chapter Introduction to Arena Arena is an easytouse powerful modeling and simulation software tool that allows the user to construct a simulation model and run experiments on the model"— Presentation transcript
2.4ASimpleModelofTheCarwashSystem2.3UsingArenaTobuildasimulationmodelandtocarryoutsimulationrunswithArena,auserperformsthefollowingsteps:1.Constructionofabasicmodel.Arenaprovidesthemodelwindowowchartview,whichisaowchart-styleenvironmentforbuildingamodel.Theuserselectsanddragstheowchartmoduleshapesintothemodelwindowandconnectsthemtodeneprocessowofthemodel.2.Addingdatatothemodelparameters.Theuseraddsactualdata(e.g.,processingtimes,resourcedemands,others)tothemodel.Thisisdonebydouble-clickingonmoduleiconsandaddingdata.3.Performingasimulationrunofthemodel.Theuserrunsthesimulationandex-aminestheresults.4.AnalysisofthesimulationresultsprovidedbytheautomaticreportsofArena.Theusercanexpandthestatistics.5.Modifyingandenhancingthemodelaccordingtotheuserneeds.Arenaprovidesafamilyofapplicationsolutiontemplates(ASTs)builtontheArenasimulationsystem.2.4ASimpleModelofTheCarwashSystemVehiclesarriveintoacarwashshoptogetasimplewashandcleanup.TheCarwashsystemconsistsofasinglewashmachine,whichprovidestheactualservicetothevehicles.Arrivingvehiclesjoinalinetowaitforservice.Thevehicleattheheadofthelineistheonethatisnexttobeservicedbythecarwashmachine.Aftertheve-hiclewashiscompleted,thevehicleleavesthesystem.Thevehiclesareconsideredthecustomersofthesystem,astheyaretheentitiesrequestingservicebytheserver(thewashmachine).Figure2.2showsagraphicalviewoftheconceptualmodeloftheCarwashsystem. Fig.2.2GraphicalviewoftheconceptualmodeloftheCarwashsystem 2IntroductiontoArenaToplacethetworemainingmodulesinthemodel,theuserselectstheCreatemodule,whichisonthemodelview.TheuserthendragstheProcessmoduleintheBasicprocesspanelontheprojectbartotheowchartmodelviewandplacesitatanylocationtotherightoftheCreatemodule.Thetwomoduleswillautomaticallybeconnected.NowtheuserselectstheProcessmoduleonthemodelviewanddragstheDisposemoduleintheBasicprocesspanelontheprojectbartotheowchartmodelviewandplacesitatanylocationtotherightoftheProcessmodule.Figure2.5showsthecompleteowchartoftheCarwashmodel.Thesecondmod-uleinthemodelisaProcessmodulewithassignednameWashstation.ThethirdmoduleisaDisposemodulewithassignednameVehiclesexit Fig.2.7TheresourcesdialogwindowintheCarwashmodelThepropertiesoftheProcessmodulewereassignedinasimilarmannerasfortheCreatemodule.Theuserdouble-clicksontheProcessmoduleandopensthedialogwindowofthemodule.Theactualvaluestobeusedarethenassignedtoallthepropertiesofthemodule,asshowninFigure2.6.ThenameassignednametotheProcessmoduleisWashstation.TheActionselectedforthemoduleis.Thismeansthatavehiclethatarriveswillwaituntiltheresourcebecomesavailable,itwillseizetheresource,itwillwaitfortheserviceinterval,andthenitwillreleasetheresource.Theactuallytheprocessingtimeortheserviceinterval.Tospecifytheresourcethatthevehicleneedsforservice,theuserclickstheAddbuttonontheResourcesareaoftheProcessmodule.AsmallResourcesdialogwin-dowappears.TheresourceisspeciedandthenameassignedtoitisWashmachineFigure2.7showstheResourcesdialogwindow.Tosetupthesimulationruns,theuserselectstheRunmenuandselectsSetup.ThedialogwindowthatappearsisshowninFigure2.8.ThisgureshowstheprojecttitleintheProjectParameterstab.TheReplicationsParameterstaboftheRunSetupdialogwindowisshowninFigure2.9.ThemainparametersetisthereplicationLength,whichisthesimulation 2IntroductiontoArenaTorunthesimulation,theuserselectsGofromtheRunmenu,orpressesF5.Afterthesimulationrunstocompletion,Arenawillasktheuserwhetherhe/sheneedstoopenthereports. Fig.2.10TheCategorybyReplicationreportoftheCarwashmodelThevariousreportsproducedbyArenaafterasimulationruncanbeaccessedandopenedfromtheReportspanelintheProjectbar.ArenaopenstheCategoryOverviewReportbydefault.Figure2.10showspartoftheCategorybyReplicationsreport.ThereisalsoatextlewithasummaryofresultsintheleFromthisreport,theaveragewaittimeofavehicleis2.2082minutes.Themax-imumwaittimeis4.4362minutes.Theaveragetimethatavehiclespentinthecarwashshopis2.4005minutes.Thetotalnumberofvehiclesthatarrivedis106andthetotalnumberofvehiclesthatwereservicedis106,therestremainedinthe Fig.2.11TheResourcesreportoftheCarwashmodel 2IntroductiontoArena Fig.2.13Partialreportaftermodifyingtheinputparametersmodules.Arenaprovidesasimplemethodtosetupthesimulationparametersandthemodelinputparameters.Avarietyofreportswiththecorrespondingsimulationresultsisproduced.ExercisesWritealistofsystemsthatwouldhaveasimilarmodelastheonefortheCar-washsystem.Increasetheinter-arrivalintervalofthearrivingvehiclesintheCarwashmodelandperformoneormoresimulationmodels.Commentonthedifferencesinresultscomparedtotheresultsfromtheoriginalsimulationrun.Decreasetheinter-arrivalintervalofthearrivingvehiclesintheCarwashmodelandperformoneormoresimulationmodels.Commentonthedifferencesinresultscomparedtotheresultsfromtheoriginalsimulationrun.IncreasetheaverageprocessingintervalofthevehiclesintheCarwashmodelandperformoneormoresimulationmodels.Commentonthedifferencesinresultscomparedtotheresultsfromtheoriginalsimulationrun.DecreasetheaverageprocessingintervalofthevehiclesintheCarwashmodelandperformoneormoresimulationmodels.Commentonthedifferencesinresultscomparedtotheresultsfromtheoriginalsimulationrun.