Chapter 7 Entity Transfer and Steady-State Statistical Analysis

Chapter 7 Entity Transfer and Steady-State Statistical Analysis PowerPoint PPT Presentation


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Simulation with Arena

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Chapter 7 Entity Transfer and Steady-State Statistical Analysis

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1. Chapter 7 Entity Transfer and Steady-State Statistical Analysis Last update September 7, 1999Last update September 7, 1999

2. Simulation with Arena — Chapter 7 — Entity Transfer and Steady-State Statistical Analysis 7 - 2 What We’ll Do ... Types of Entity Transfers Resource-Constrained Transfers Transporters (Model 7.1) Conveyors Non-accumulating (Model 7.2) Accumulating (Model 7.3) Statistical analysis of steady-state simulations Warm up and run length (Model 7.4) Truncated replications (Model 7.5) Batching in a single run (Model 7.6) Automatic run-time confidence intervals via batch means

3. Simulation with Arena — Chapter 7 — Entity Transfer and Steady-State Statistical Analysis 7 - 3 Types of Entity Transfers Connect Zero-delay Connection graphic vs. module Labels (no graphic) Route Non-zero-delay — constant, r.v., expression Stations, animated Routes Fixed routes vs. entity-dependent Sequences Connect and Route both assume: No limit on number in transit at a time Entities have their own feet

4. Simulation with Arena — Chapter 7 — Entity Transfer and Steady-State Statistical Analysis 7 - 4 Resource-Constrained Transfers Limit total number of entities in transit at a time Telecommunications (number of packets) Logistics (number of vehicles) Entities still have their own feet Model via existing constructs — think creatively Model “space” on the “road” as a Resource Limit number of Units of this Resource Entity must Seize unit of “space” resource before beginning trip, Release it at end of trip The “space” resource must be defined via a Resources module if > 1 unit is required

5. Simulation with Arena — Chapter 7 — Entity Transfer and Steady-State Statistical Analysis 7 - 5 Resource-Constrained Transfers (cont’d.) Leave Data area of many logic modules Tran Out… button Seize a unit of the “space” resource Priority (1 is highest, …) If no units are free, entity must stay where it is Option for Load Time Enter Data area of many logic modules Tran In… button Release the unit of the “space” resource Option for Unload Time

6. Simulation with Arena — Chapter 7 — Entity Transfer and Steady-State Statistical Analysis 7 - 6 Transporter Concepts Carts, fork lifts, trucks, wheelchairs, people, … When entity is ready to go somewhere, it needs to be “picked up” and moved Use Transporters — “moveable” resources Activities: Request, Transport, and Free Two types of Transporters Free-Path (we’ll do) Travel time depends only on velocity, distance Ignore “traffic jams” and their resulting delays Guided (won’t do) AGVs, intersections, etc.

7. Simulation with Arena — Chapter 7 — Entity Transfer and Steady-State Statistical Analysis 7 - 7 Creating Transporters Transporter data module (Transfer panel) Transporter name (Cart in our model) Number of Units (2) Free Path vs. Guided (accept Free Path default) Distance Set (accept default name Cart_Dst) Velocity (50 feet/min.) Initial Position (accept Arbitrary default) Options ... When Freed ... (Remain Where Freed) Can have Schedules, Failures, Statistics Picture for animation, including Ride Point

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