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FlexSim Supplemental Training part of the FlexSim Education Initiative:. Textbook: Applied Simulation, modeling and Analysis using FlexSim Educator support materials Video insight series Supplemental training 4 week series Introduction, In-depth topics - PowerPoint PPT Presentation
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FlexSim Supplemental Trainingpart of the
FlexSim Education Initiative:
• Textbook: Applied Simulation, modeling and Analysis using FlexSim– Educator support materials– Video insight series
• Supplemental training 4 week series– Introduction, In-depth topics
• FlexSim application aids (help menu)– User Manual– Getting Started tutorials
• FlexSim formal training courses– Basic, Advanced, Specialized
120121029
Example Model- Overview
• Introduction of common modelling concepts– Dynamic routing decisions– Itemtypes– Labels– Statistical Distributions– Object Triggers– Global Tables
22
Model Description• Purpose
– Learn how to assign and use labels on flowitems for routing and processing purposes. Learn how to use an empirical distribution to assign itemtypes.
• Description– Parts arrive in a queue exponentially every 30 seconds. There are
four part types (1,2,3,4) distributed (20%, 30%, 40%, 10%) respectively (see dempirical in Flexsim Command Summary).
– The parts are processed on one of four machines. Each machine is dedicated to a single part type. The processing times at each machine is uniform(100,120) seconds for first time parts, and uniform(120,130) seconds for rework parts.
– After the parts are machined, they are put in a queue and wait to be tested. The test time is a constant 10 seconds. Parts that pass, leave the model, failed parts are routed back to the first queue to be reworked. 10% of the parts fail.
– Parts being reworked are given priority in the queue.
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Model Layout
44
Model Flow – From the Source to the Sink
Requirements:• Four part types• Each part type has a dedicated machine• Randomly assign part typesConcepts:• Itemtype Attribute• Send to Port picklist options• Statistical distributions• Object triggers
5
Understanding the Basic Pick List
66
Choose an option or type an expression
directly into the field
Edit the selectedoption graphically(template editing)
Edit Code for thisoption
Option Name
Editing Picklists• Graphical pop-up
windows will guide you in editing picklist options. Different options will require different information to use correctly
77
Using DistributionsWhat you need to know:• The name of the distribution• The parameters it requires
– Check the documentation!• Where to use it!
Example: dempirical(“TableName”)See the commands help from within Flexsim for moreinformation
8
Order of Execution(pushed flowitem)
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OnEntry flowitem enters Setup Time Pick Operator
OnSetupFinishProcess Time
delay
Pick Operator
OnProcessFinish
Use TransportOnExit
Send To Port
delay
delay possibledelay
Ex. Change Source Arrival
• The statistical probability distribution which best simulates the inter-arrival pattern is an exponential distribution with a location value of 0 and a scale value of 30.
1010
Itemtypes• itemtype – all flowitems
have an attribute called itemtype. It’s a numeric identifier used to distinguish one “type” of flowitem from another in processing and routing decisions in a model.
• Addressable to the user via getitemtype( flowitem )
1111
Concept of Triggers• When key events occur on an object, a
trigger is fired.• The user may specify a variety of things to
happen when a trigger fires (trigger logic).• There are triggers when a flowitem enters
or exits an object. There are triggers when a process time finishes or a repair time is complete.
• Each type of object has a unique set of triggers.
1212
Triggers• Define and customize
system behavior at a specific event occurrence.– Write/read information
to/from a flowitem.– Change visual properties
of flowitems or objects.– Send Messages to other
objects.– Change behavior of other
objects.– And much more…
1313
Understanding the Trigger Pick List
1414
Trigger NameEdit** the options (template editing)
Edit Code for thisoption
**The Edit button shown will take on the “Add” iconWhen no options are selected for the trigger.
Editing Triggers• Trigger pop-up windows
show all the active options for the trigger
• Add or remove options with the appropriate buttons
• Individual options can be editing by clicking the hide/collapse triangle
• Blue Text can be edited. Tab will jump between fields. Some options have a hint window 1515
Labels• labels – information can
be stored on flowitems (and other modelling objects) in the form of labels.
• Flowitems and other Flexsim objects can have an unlimited number of labels.
• Labels have a name and data. The data may be numeric, string, list, or table.
1616
Object Labels• syntax
– getlabelnum( object, “labelname” )– setlabelnum( object, “labelname” , value )– getlabelstr( object, “labelname” )– setlabelstr( object, “labelname” , string )– label( object, “labelname” )
• examples– getlabelnum( item, “serialnumber” )– setlabelnum( item, “serialnumber”, 5 )– getlabelstr( current, “category” )– setlabelstr( current, “category”, “groceries” )– inc( label(item, “stepnum”), 1 )
• The increment command only works with number data1717
The Flowitem Bin• Sources create copies
of objects in the Flowitem Bin
• Any changes made to objects in the Bin affect the flowitems that are created by Sources
• Used to create labels, set size, color, shape, etc.
1818
Routing Back to the Queue
Requirement:• 10% of all tested parts fail, and are sent
back to the first queue awaiting rework.Concepts:• Send to Port picklist• Object Trigger Events
19
Edit Object Behavior
Requirements:• Conditional process times based on items needing to
be reworked• Prioritize items in the queue that need to be reworked
Concepts:• Labels• Object Trigger Events• Statistical distributions
20
Questions & Bonus
• Where is the bottleneck?
• Can you change the color of failed parts?
• Change the model to count how many times a part has failed.
• Add a Dashboard to Track throughput per hour of the system.
21
Dashboards• Adds customizable charts
and graphs that update in real-time with your model
• Many Predesigned charts available
• Using the Tracked Variables tool, also allows for the creation of user defined charts
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