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
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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.