lab 3_Part 3.pdf - Lab 3_Part 3 Sequencing Lab A Small...

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Lab 3_Part 3: Sequencing Lab A Small Manufacturing System From Chapter 7, Kelton et al, Simulation with Arena 1. Process Planning (Part Sequencing) 2. Sets and further Variable settings in Arena
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Model 7-1 Chapter 7 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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Part Pathways 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 Run for 32 hours
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New Modelling 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 we 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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Modelling approach 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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Sequence Data Module Advanced Transfer panel Double-click for new row for each process plan Name for each Sequence Open Steps column for subdialog Define ordered sequence of Stations to be visited in the
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  • Spring '12
  • NguyenXuanLong,JohnLafferty
  • entity, Natural number, Being, Cell 3 Machines

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