BasicModelingInputAnalysis

BasicModelingInputAnalysis - MODELING BASIC OPERATIONS AND...

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MODELING BASIC OPERATIONS AND INPUT ANALYSIS Weeks 5-6 Kelton text (Ch. 4) GE-703 Kumpaty
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What We’ll Do . .. Model 4-1: Electronic assembly/test system Modeling approaches New Arena modules (Decide, Record) Model 4-2: Enhanced electronic assembly/test Resource Schedules, States, and Failures Frequency outputs More on utilizations Model 4-3: Enhancing the animation Queues, Entity Pictures, Resource Pictures Adding Plots and Variables
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What We’ll Do . .. (cont’d.) Model 4-4: Adding entity travel times Stations, Transfers, Routes, animation of entity movement Finding and fixing model errors Input analysis Specifying input distributions, parameters Deterministic vs. random input Collecting and using data Fitting input distributions No data? Nonstationary arrival processes Multivariate and correlated input data
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Electronic Assembly/Test System (Model 4-1) Produce two different sealed elect. units (A, B) Arriving parts: cast metal cases machined to accept the electronic parts Part A, Part B – separate prep areas Both go to Sealer for assembly, testing – then to Shipping (out) if OK, or else to Rework Rework – Salvaged (and Shipped), or Scrapped
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Part A Interarrivals: expo (5) min. From arrival point, go immediately to Part A Prep Process = (machine + deburr + clean) ~ tria (1,4,8) min. Go immediately to Sealer Process = (assemble + test) ~ tria (1,3,4) min. 91% pass, go to Shipped; Else go to Rework Rework: (re-process + testing) ~ expo (45) min. 80% pass, go to Salvaged; Else go to Scrapped
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Part B Interarrivals: batches of 4, expo (30) min. Upon arrival, batch breaks into 4 individual parts Proceed immediately to Part B Prep area Process = (machine + deburr +clean) ~ tria (3,5,10) Go to Sealer Process = (assemble + test) ~ weib (2.5, 5.3) min. , different from Part A, though at same station 91% pass, go to Shipped; Else go to Rework Rework: (re-process + test) = expo (45) min. 80% pass, go to Salvaged; Else go to Scrapped
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Run Conditions, Output Collect statistics for each work area on Resource utilization Number in queue Time in queue For each exit point (Shipped, Salvaged, Scrapped), collect total time in system (a.k.a. cycle time)
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Developing a Modeling Approach Define pieces of model, modules, data structures, control logic Appropriate level of detail judgment call Often multiple ways to model, represent logic This model: Entities are the individual parts (two types) Separate Create modules for two part types Separate Process modules for each Prep area Process modules for Sealer and Rework, each followed by a Decide module (2-way by Chance) Depart modules for Shipped, Salvaged, Scrapped Attribute Sealer Time assigned after Creates in Assign modules (parts have different times at the Sealer) Record modules just before Departs for time in system
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This note was uploaded on 02/13/2011 for the course ENGINEERIN 481 taught by Professor Abdulmalek during the Spring '11 term at Kuwait University.

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BasicModelingInputAnalysis - MODELING BASIC OPERATIONS AND...

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