sml_ch07 - IME Educating Global Information Technology...

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IME Educating Global Information Technology Frontiers Simulation 한국외국어대학교 Ch 7. Intermediate Modeling and Steady-State Statistical Analysis
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What We’ll Do . .. Model 7-1: A small manufacturing system Entity-dependent Sequences Data requirements and availability Verification (debugging) tatistical analysis of steady tate simulations HUFS 2 Simulation Statistical analysis of steady-state simulations Warmup and run length Truncated replications Batching Other methods and goals
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Model 7-1: A Small Manufacturing System art arrivals, four cells, part departures HUFS 3 Simulation 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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A Small Manufacturing System (cont.) Three separate part types Interarrivals ~ Expo(13) minutes 26% type 1, 48% type 2, 26% type 3 Different part types follow different routes, have different (triangular) processing times: HUFS 4 Simulation 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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New Arena Concepts Non-identical machines at Cell 3 Different entity types follow different process plans Need process plan with automatic routing by entity type – different Sequence assigned to each entity (like an attribute), HUFS 5 Simulation 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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The Modeling Approach Use Sequence for part transfer 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, art transfer times HUFS 6 Simulation part transfer times
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Sequence Data Module Advanced Transfer panel Double-click for new row for each process plan Open Steps column for subdialog Define ordered sequence of Stations to be visited in the Sequence … must have Station Names already defined ouble lick to add a new Station to the bottom of the HUFS 7 Simulation Double-click to add a new Station to the bottom of the Sequence list; right-click to insert/delete a row Name for each step Possible Assignments of Attribute, Variable, Pictures, etc. at each station in the Sequence … this is done before transferring the entity to this step in the sequence In this model, Attribute assignment used to attach Process Time Attribute to entity for the next Cell (except for Cell 1)
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Sequence Data Module (cont.) Assign Sequence Name to entities that follow it
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This note was uploaded on 11/01/2010 for the course WEQ 252 taught by Professor Wadud during the Spring '10 term at Allegheny Wesleyan.

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sml_ch07 - IME Educating Global Information Technology...

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