Chapter 07-intermediatemodelingSlides

Chapter 07-intermediatemodelingSlides - Intermediate...

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Simulation with Arena, 4 th ed. Slide 1 of 37 Intermediate Modeling and Steady-State Statistical Analysis Chapter 7 Last revision August 26, 2006
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Simulation with Arena, 4 th ed. Slide 2 of 37 What We’ll Do . .. Model 7-1: A small manufacturing system Entity-dependent Sequences Data requirements and availability Verification (debugging) Statistical analysis of steady-state simulations Warmup and run length Truncated replications Batching Other methods and goals
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Simulation with Arena, 4 th ed. Slide 3 of 37 Model 7-1: A Small Manufacturing System Part arrivals, four cells, part departures Cells 1, 2, and 4: single machine each Cell 3: two machines — newer one 20% faster Need: way to model non-identical resource units Circular layout of cells Parts enter at left, exit at right, travel only clockwise, all transfer times = 2 min. (realistic?)
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Simulation with Arena, 4 th ed. Slide 4 of 37 A Small Manufacturing System (cont’d.) Three separate part types Interarrivals (all types merged) ~ expo(13) minutes 26% type 1, 48% type 2, 26% type 3 Different part types follow different routes, have different (triangular) processing times: Observe utilizations, time/number in queues, cycle times (times in system) by part type At Cell 3, parameters are for slow machine
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Simulation with Arena, 4 th ed. Slide 5 of 37 New Arena Concepts Non-identical machines at Cell 3 Different entity types follow different process plans Previous models – all entities went through same sequence of stations, maybe with Decides for branching Now, need process plan with automatic routing by entity type – different Sequence assigned to each entity (like an attribute), and entity follows its own sequence Won’t use direct Connect or Routes … instead, tell entities departing from modules to follow their own Sequence Arena internally keeps track of where entity is, where it will go next
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Simulation with Arena, 4 th ed. Slide 6 of 37 The Modeling Approach Usually there are many ways to build a (correct) Arena model And also many ways to do so incorrectly … Important to think about data structures What data are available? How will they be stored in the model? For this model … Use Sequence for part transfer (described below) As part of Sequence definition, can define Attributes Do for processing times at all cells but Cell 1 Use an Expression for processing times at Cell 1 Use Variables for new-machine speedup at Cell 3, part transfer times
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Chapter 07-intermediatemodelingSlides - Intermediate...

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