Copyright © 2013 - Jeffrey S. Smith and Simio LLC | All Rights Reserved 1

Learning Simio Lab Series 1

Lab Module 02

Serial Manufacturing Line

2

Objectives and Outline

• Lab Objectives– Continue learning basic Simio modeling– Understand the basics of symbols and the default object instance symbol list– Lean about experiment responses– Learn how to use SMORE plots

• Lab Outline– Video 1 - Describe the 3-stage manufacturing system to be modeled, build the basic model, and

verify the model– Video 2 – Add symbols to the model and learn how to change entity and server symbols as the model

runs– Video 3 – Add experiment responses and view/interpret the Response Results (SMORE plots)– Video 4 - Assignment

Copyright © 2013 - Jeffrey S. Smith and Simio LLC | All Rights Reserved

3Copyright © 2013 - Jeffrey S. Smith and Simio LLC | All Rights Reserved

Serial Manufacturing Line

Machine Grind Package

Parts arrive at the rate of 60/hour.

Machining requires approximately 45 seconds/part.

10% of machined parts require re-machining

Grinding requires approximately 55 seconds/part.

10% of ground parts are deemed “bad” and are disposed of.

Packaging requires approximately 63 seconds/part.

4Copyright © 2013 - Jeffrey S. Smith and Simio LLC | All Rights Reserved

Build the Model!

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Video 03 – Experiment Responses and Response Results

• A response is a Simio expression that is evaluated at the end of a replication. Responses can have:– Units (e.g., Time)– Objective (minimize or maximize)– Lower and Upper bounds

• For our model, we’ll develop responses for:– Server utilization (Machine, Grind, Package)– Average time in system (for the population of Parts entities)– Average number in system (for the population of Parts entities)

SMORE Plots Nelson, B.L., “The MORE Plot: Displaying Measures of Risk and Error from Simulation Output,” Proceedings of the 2008 Winter Simulation Conference

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Video 04 - Assignment

• Add Inspection and Rework steps after Grinding– After the grinding process, all parts go through an inspection step. There is a single inspector and the

inspection takes between 30 and 50 seconds (uniformly distributed). 20% of the inspected parts are found to need rework (the remaining 80% go to packaging). There are two rework operators and rework takes between 5 and 10 minutes (uniformly distributed). 50% of the parts are still bad after rework and are scraped. The remaining 50% are sent to packaging.

• Modify the model based on the system changes. Create responses for the following:– Server utilizations (Machine, Grind, Inspect, Rework, Packaging)– Time in system for the entire part population– Time in system for good parts– Time in system for scrapped parts– Number of parts in the system– Number of parts in the Input Buffer for the Packaging station (hint – you will need to use the

expression editor to “explore” the Package server object components to determine the appropriate expression)