Lab Module 02

Report
Learning Simio Lab Series 1
Lab Module 02
Serial Manufacturing Line
Copyright © 2013 - Jeffrey S. Smith and Simio LLC | All Rights Reserved
1
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
2
Serial Manufacturing Line
Machine
Parts arrive
at the rate of
60/hour.
Grind
Package
Machining requires
approximately 45
seconds/part.
Grinding requires
approximately 55
seconds/part.
Packaging
requires
approximately
63 seconds/part.
10% of machined
parts require remachining
10% of ground parts
are deemed “bad” and
are disposed of.
Copyright © 2013 - Jeffrey S. Smith and Simio LLC | All Rights Reserved
3
Build the Model!
Copyright © 2013 - Jeffrey S. Smith and Simio LLC | All Rights Reserved
4
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)
Copyright © 2013 - Jeffrey S. Smith and Simio LLC | All Rights Reserved
5
SMORE Plots
Nelson, B.L., “The MORE Plot:
Displaying Measures of Risk and
Error from Simulation Output,”
Proceedings of the 2008 Winter
Simulation Conference
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:
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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)
Copyright © 2013 - Jeffrey S. Smith and Simio LLC | All Rights Reserved
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