Simulate

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An Introduction to
Simulation
in the
Manufacturing Industry
using

SIMUL8 2009
(release 16)

Jim Shalliker
Heybrook Associates

&

Chris Ricketts
University of Plymouth

for

SIMUL8 Corporation

The contents of this introduction to SIMUL8 2009 (release 16) may be copied and
incorporated into other teaching material, wholly or in part, for use by staff and students
of anyeducational establishment having a site licence for the software.
Last update 21 July 2009

CONTENTS
1.

BUILDING A SIMPLE SIMULATION MODEL WITH SIMUL8 2008
1.1 An introduction to building simulation models
1.1.1 What is SIMUL8 ?
1.1.2 The Building Blocks
1.1.3 Conventions used in these notes
1.1.4 Starting SIMUL8
1.2 Building your own model
1.3 Gear manufacturing - deterministicsimulation
1.3.1 Creating the model
1.3.2 Running the deterministic simulation
1.3.3 Travel times
1.3.4 Results from the deterministic model
1.3.4.1
Work exit point results
1.3.4.2
Queuing time results
1.3.4.3
Queue length results
1.3.4.4
Work center results
1.4 Stochastic effects
1.4.1 Defining distributions
1.4.2 Changing the distributions
1.4.2.1
Random arrivals – Exponentialdistribution
1.4.2.2
Grinding times – Erlang distribution
1.4.2.3
Washing times – Normal distribution
1.4.2.4
Grind3 times – Empirical distribution (continuous)
1.4.3 Running the stochastic model
1.5 Adding more operations - polishing and inspecting
1.6 Improving the appearance of your simulation model
1.6.1 Zooming in and out
1.6.2 Changing the icons
1.6.3 Changing the format of iconlabels
1.6.4 Creating your own icons
1.6.5 Grouping several icons into a single icon
1.6.6 Changing the appearance of work centers to reflect their
current status
1.6.7 Changing the appearance of work items as they move
through the system
1.6.8 Multiple identical work centers

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2.
2.1
2.2
2.3
2.4
2.5
2.6
2.7
3.

CONTROLLING THE SIMULATION EXPERIMENT
The warm-up period
Variation between runs
Obtaining confidence limits
Conducting a trial (multiple simulation runs) automatically
Variation between work items
Using Excel to analyse results
Variation in simulation experiments: summary

ADVANCED MODELING TECHNIQUES
3.1 Interruptions (scheduledand unexpected)
3.1.1 Scheduled stoppages for maintenance
3.1.2 Unscheduled stoppages due to breakdowns
3.2 Other methods of defining distributions
3.2.1 Sampling from an empirical distribution
3.2.2 A time dependent distribution
3.3 Processes, Prioritizing and Routing
3.3.1 Prioritizing the work centers
3.3.2 Sending to scrap
3.3.3 Sending back to a preceding work center with prioritytreatment
3.3.4 Routing back to the same work center
3.4 Resources
3.4.1 Provisional model using an operator to set up the grinders
3.4.2 Improving the model
3.5 Labels
3.5.1 Using a numeric label to prioritize work
3.5.2 Using a text label to specify different timing distributions
3.5.3 Using labels to control the appearance of work items
3.5.3.1
Using text labels
3.5.3.2
Using numericlabels
3.6 Financial analysis
3.6.1 Improving the Grind work centers to reduce costs
3.6.2 Improving the Grind work centers to increase profit
3.6.1.1
A provisional model
3.6.1.2
An improved model
3.7 Visual Logic
3.7.1 Prioritizing work centers
3.7.2 Using an extra grinding machine when there is high demand

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1. BUILDING A SIMPLE SIMULATION MODEL WITH SIMUL8 2008
1.1 An introduction to building simulation models
1.1.1 What is SIMUL8 ?
SIMUL8 is a computer package for Discrete Event Simulation from SIMUL8 Corporation.
It allows the user to create a visual model of the system being investigated by drawing
simulation...
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