 1  Outline  Chapter 3: Guided Tour Through Arena  Chapter 4: Modeling Basic Operations and Inputs

 2  Chapter 3 Guided Tour Through Arena

 3  Model Model  a drill press processing one type of product  interarrival times ~ i.i.d. exp(5)  service times ~ i.i.d. triangular (1,3,6)  all random quantities are independent a drill press one type of parts; parts come in and are processed one by one

 4  Model Model and Model Model Model Model  fundamental questions  specialized or generalized workers?  effect of variability of service times?  applicant arrivals: interarrival times ~ i.i.d. exp(1.25)  four workers: all service times ~ exp(1)  Model 03-02: sequential servers  Alfie checks credit; Betty prepares covenant; Chuck prices loan; Doris disburses funds  Model 03-03: parallel servers  Each employee can do any tasks

 5  Remarks for Models to Model  Expression Builder & the online book (Arena Variables Guide.pdf)Arena Variables Guide.pdf generalized (and parallel) servers specialized (and sequential) servers constant service times exponential service times Model 03-05Model Model 03-04Model 03-02

 6  Insights from Simulation Results  generalized (parallel) servers being better  less WIP; shorter total time in system; shorter total waiting time; higher throughput  less variable service times being better  less WIP; shorter total time in system; shorter total waiting time; higher throughput  formal proof after numerical evidence

 7  Comments on Menus and Toolbars  many  menus: Edit, View, Tools, Arrange, Object, Run, Window, Help  toolbar: Standard, Draw, Animate, Integration, View, Arrange, Run Interaction, Record Macro, AVI Capture, Animate Transfer  different levels of help different levels of help  specific features of Running  no animation: fast forward or batch run  compiling by clicking F4  debugging

 8  Chapter 4 Modeling Basic Operations & Inputs

 9  A Sequence of Related Models  Model 4-1: a sealed electronic assembly and test system  more features,  Model 4-2: additional features in scheduling, failure, and states of resources  Model 4-3: more advanced animation  Model 4-4: advanced features in moving – stations, routes, and animation

 10  An Electronic Assembly/Test System Sealer Part A EXPO(5) Part B Batches of 4 EXPO(30), de- batch on arrival Process A Tria(1,4,8) Process B Tria(3,5,10) Part A TRIA(1,3,4) Part B WEIB (2.5, 5.3) EXPO(45) Rework 9% 91% Shipped 20% Scrapped 80% Salvaged & Shipped

 11  An Electronic Assembly/Test System Sealer Part A EXPO(5) Process A Tria(1,4,8) Process B Tria(3,5,10) Part A TRIA(1,3,4) Part B WEIB (2.5, 5.3) EXPO(45) Rework 9% 91% Shipped 20% Scrapped 80% Salvaged & Shipped Part B Batches of 4 EXPO(30), de- batch on arrival type-dependent service times create entities processes chance statistics time varying capacity unreliable system to determine the number of racks create batches of 4 entities & de-batch later

 12  Model Model  ignore details  the 2-minute traveling times  the working hours of stations  schedule of the re-workers  failure of the sealer  the number of racks used