or 335 / syst 335 introduction to arena. introduction brant horio [email protected]
TRANSCRIPT
OR 335 / SYST 335OR 335 / SYST 335
Introduction to ARENAIntroduction to ARENA
Back to the BasicsBack to the Basics
Fundamentals of simulation methodology Fundamentals of simulation methodology are the cornerstone of all simulation are the cornerstone of all simulation packagespackages
Basics are necessary for accurate model Basics are necessary for accurate model development and model output development and model output understandingunderstanding
Different packages then become only an Different packages then become only an issue of a new syntaxissue of a new syntax
Model Development is an Art!Model Development is an Art!
Incredible model flexibility with ‘over the Incredible model flexibility with ‘over the counter’ simulation software packagescounter’ simulation software packages
Art of practice involved with interpretation Art of practice involved with interpretation of systemof system
Endless possibilities in ‘how’ to model a Endless possibilities in ‘how’ to model a specific systemspecific system
Model Development is an Art!Model Development is an Art!
Essential Core of Simulation Analysis Essential Core of Simulation Analysis is Scientific Experimentationis Scientific Experimentation Endless possibilities in ‘How’ to model a Endless possibilities in ‘How’ to model a
specific systemspecific system You must determine best way to account for You must determine best way to account for
all relevant assumptions/variables and all relevant assumptions/variables and maintain end-user flexibilitymaintain end-user flexibility
Maintain focus on problem as a wholeMaintain focus on problem as a whole
The Modeling BreakdownThe Modeling Breakdown
10%:10%: Model DevelopmentModel Development
90%:90%: Problem DefinitionProblem DefinitionData Collection / AnalysisData Collection / AnalysisScenario ExperimentationScenario ExperimentationOutput AnalysisOutput AnalysisExpected Success MeasuresExpected Success MeasuresModel PresentationModel Presentation
Success Story?Success Story?
Aircraft Service Equipment Inventory Aircraft Service Equipment Inventory IncreaseIncrease Is the increase necessary?Is the increase necessary? Is the expected service time improvement Is the expected service time improvement
worth the associated massive capital worth the associated massive capital expense?expense?
These are questions Simulation Analysis These are questions Simulation Analysis is meant to answeris meant to answer
Success!Success!
1 Simulation software license:1 Simulation software license: $18,000$18,000
Time to build model:Time to build model: 3 months3 months
Number of models built:Number of models built: 1______ 1______
Result:Result: Priceless?Priceless?
Nope, … Prevented capital expenditure of Nope, … Prevented capital expenditure of ~ ~ $1 million$1 million
Introduction to ARENAIntroduction to ARENA
Windows driven interfaceWindows driven interface
Flowchart style model developmentFlowchart style model development Process blocksProcess blocks Process routing determined by connections Process routing determined by connections
between blocksbetween blocks Templates contain process blocksTemplates contain process blocks
Example model construction of a Example model construction of a One-Node systemOne-Node system
Example One-Node SystemExample One-Node System
Model is composed of 3 partsModel is composed of 3 parts Creation/Introduction of entities to systemCreation/Introduction of entities to system Processing of entities in the systemProcessing of entities in the system Exiting the entities from the systemExiting the entities from the system
Example ProblemExample ProblemThe Sooty DilemmaThe Sooty Dilemma
The Sooty DilemmaThe Sooty Dilemma
CREATE:CREATE: 43 new baby guinea pigs to be born at a rate 43 new baby guinea pigs to be born at a rate
of Triangular( 2, 5, 6 )of Triangular( 2, 5, 6 )
PROCESS:PROCESS: Baby guinea pigs are adopted at a rate of Baby guinea pigs are adopted at a rate of
Triangular( 3, 5, 8 )Triangular( 3, 5, 8 )
Question:Question: What is the expected time for the entire litter What is the expected time for the entire litter
to be adopted?to be adopted?
Note:Note:
Distributions are unreasonableDistributions are unreasonableAssumptions of introduction of baby Assumptions of introduction of baby guinea pigs to system are inaccurateguinea pigs to system are inaccurate
Emphasizes the point that:Emphasizes the point that:
GARBAGE IN, GARBAGE OUT!GARBAGE IN, GARBAGE OUT! Be Careful !!!Be Careful !!!
Basic ProcessBasic Process Template Template
CreateCreate: Generate : Generate entities to systementities to system
ProcessProcess: Perform : Perform action on entitiesaction on entities
DecideDecide: Routes entity : Routes entity based on conditionbased on condition
DisposeDispose: Exits entity : Exits entity from systemfrom system
Additional TemplatesAdditional Templates
CREATECREATE Module Module
NameName: Module name: Module nameEntity TypeEntity Type: Unit to : Unit to create for systemcreate for systemTime Between Time Between ArrivalsArrivals: Apply : Apply distribution or custom distribution or custom expressionexpressionEntities per ArrivalEntities per Arrival, , MaxMax and and First First CreationCreation
Spreadsheet Entry AvailableSpreadsheet Entry Available
Module parameter entryModule parameter entry Flowchart view ( Double-click module block )Flowchart view ( Double-click module block ) Selection of module block also opens specific Selection of module block also opens specific
spreadsheet view on bottom of screenspreadsheet view on bottom of screen
Spreadsheet ModulesSpreadsheet Modules
Spreadsheet displays based on Spreadsheet displays based on templatetemplate
Create and manage model Create and manage model components in centralized areacomponents in centralized area
When in Doubt, Right ClickWhen in Doubt, Right Click
‘‘Build Expression’ Build Expression’ provides flexibilityprovides flexibility
Most useful for Most useful for applying distributionsapplying distributions
Generate random Generate random numbersnumbers
Create custom Create custom formulasformulas
PROCESSPROCESS Module Module
ActionAction:: Delay:Delay: dd dd Seize Delay:Seize Delay: dd dd Seize Delay Release:Seize Delay Release:
dddd Delay Release:Delay Release: sds sds
PROCESS ModulePROCESS Module‘Action’ Options‘Action’ Options
DelayDelay: Delays/Processes entity for a given time : Delays/Processes entity for a given time period ( No Queue )period ( No Queue )
Seize Delay ( Part 1 )Seize Delay ( Part 1 ): Utilizes resource to : Utilizes resource to process entity ( Queue )process entity ( Queue )
Delay Release ( Part 2 )Delay Release ( Part 2 ): Utilizes captured : Utilizes captured resource to process, then releases resourceresource to process, then releases resource
Seize Delay ReleaseSeize Delay Release: Utilizes resource to : Utilizes resource to process entity, then allows resource to process process entity, then allows resource to process another entity ( Queue )another entity ( Queue )
PROCESS Module - QueuesPROCESS Module - Queues
Queues are customizable ( Dbl Click Queue )Queues are customizable ( Dbl Click Queue )
DISPOSEDISPOSE Module Module
Exits entity from systemExits entity from system
Automatically tracks entity throughputAutomatically tracks entity throughput
Run SetupRun Setup
Model RunModel Run
Remember time units!!!Remember time units!!!
General rule of thumb for replication is 30General rule of thumb for replication is 30
Model will have automatic basic Model will have automatic basic animationsanimations
After run completion; report generationAfter run completion; report generation
Output ReportsOutput Reports
Category by ReplicationCategory by Replication Most data output is automaticMost data output is automatic
Litter to be completely adopted in 272 Litter to be completely adopted in 272 days based on current assumptions!days based on current assumptions!
ANIMATION!ANIMATION!
Focus on basics for nowFocus on basics for now
Power of simulation is best embodied by Power of simulation is best embodied by its ability to communicate and justify its ability to communicate and justify recommendations to decision makersrecommendations to decision makers
‘‘Buy Off’ is of critical importanceBuy Off’ is of critical importance
Animation is invaluable in assisting Animation is invaluable in assisting communication of the modelcommunication of the model
May also act as a debugging toolMay also act as a debugging tool
ANIMATIONANIMATION
Entity animation pictures are customizable Entity animation pictures are customizable under EDIT / ENTITY PICTURESunder EDIT / ENTITY PICTURES
Resource animation pictures are Resource animation pictures are customizable through the ‘Animate’ buttoncustomizable through the ‘Animate’ button
Happy ModelingHappy Modeling
Play around with Arena on your ownPlay around with Arena on your own
Increased familiarity = increased model Increased familiarity = increased model development proficiencydevelopment proficiency
Questions?Questions?