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The Process Flowchart Module (cont’d.)
• Delay Type – choice of probability distributions,
constant or general Expression (more later …)
• Units – time units for the delay
• Allocation – how to “charge” delay in costing
(more later …)
• Prompts on next line – change depending on
choice of Delay Type – specify numerical
parameters involved
• Can also edit in spreadsheet view
Subdialogs (e.g., Resource here) become secondary spreadsheets that pop up, must be closed Docsity.com
The Resource Data Module
• Defining the Drilling Center Resource in the
Process module automatically creates an entry
for it in the Resource data module
• Can edit it here for more options
Type – could vary capacity via a Schedule instead of having a fixed Capacity
- Would define the Schedule via Schedule data module … more later Failures – could cause resource to fail according to some pattern
- Define this pattern via Failure data module (Advanced Process panel) … more later
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Animating Resources and Queues
• Got queue animation automatically by
specifying a Seize in the Process module
Entity pictures (blue balls) will line up here in animation
• Don’t get Resource animation automatically
To add it, use Resource button in Animate toolbar … get Resource Picture Placement dialog
- Identifier – link to Resource name in pull-down list
- Specify different pictures for Idle, Busy state For pre-defined artwork, Open a picture library (.plb filename extension) Scroll up/down on right, select (single-click) a picture on right, select Idle or Busy state on left, then to copy the picture To edit later, double-click on picture in flowchart view
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The Dispose Flowchart Module
• Represents entities leaving model boundaries
• Name the module
• Decide on Record Entity Statistics (average and
maximum time in system of entities exiting here,
costing information)
Check boxes for statistics collection and reporting: Most are checked (turned on) by default Little or no modeling effort to say yes to these However, in some models this can slow execution markedly Moral – if you have speed problems, clear these if you don’t care about them Docsity.com
Dynamic Plots
• Trace variables, queues as simulation runs
• Disappear after run ends (to keep, must save
data, postprocess via Output Analyzer — later)
• A kind of “data animation”
• Plot button from Animate toolbar… “Add” for
Expression to plot (help via Expression Builder … later) Min/Max y -axis values (initially guesses, maybe revise) Number of “corners” to show (# History Points) at a time Stepped option (for piecewise-constant curves) Colors
• In Plot dialog – Time Range ( x axis), cosmetics
• Resize plot itself by dragging corners
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Dressing Things Up
• Add drawing objects from Draw toolbar
Similar to other drawing, CAD packages Object-oriented drawing tools (layers, etc.), not just a painting tool
• Add Text to annotate things
Control font, size, color, orientation
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Running It
• Plain-vanilla run: Click from Standard toolbar
(like VCRs, CD players, etc.)
First time or after changes: Check Enters run mode — can move around but not edit Speed up (> on keyboard) or slow down (<) animation display When done, asked if you want to see summary reports Click to get out of run mode Can pause run with
• Other run control, viewing, checking options
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Viewing the Reports
• Click Yes in the Arena box at the end of the run
Opens up a new reports window (separate from model window) inside the Arena window Project Bar shows Reports panel, with different reports (each one would be a new window) Remember to close all reports windows before future runs
• Default installation shows Category Overview
report – summarizes many things about the run
Reports have “page” to browse ( and ) Also, “table contents” tree at left for quick jumps via ,
• Times are in Base Time Units for the model
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Types of Statistics Reported
• Many output statistics are one of three types:
Tally – avg., max, min of a discrete list of numbers
- Used for discrete-time output processes like waiting times in queue, total times in system Time-persistent – time-average, max, min of a plot of something where the x -axis is continuous time
- Used for continuous-time output processes like queue lengths, WIP, server-busy functions (for utilizations) Counter – accumulated sums of something, usually just nose counts of how many times something happened
- Often used to count entities passing through a point in the model
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More on Reports and their Files
• Reports we just saw – based on a MS Access
database that Arena writes as it runs
Can be saved and viewed later Viewing within Arena done via Seagate Crystal Reports to query the Access database\
• Arena also produces a plain-text summary report
(.out filename extension)
Was in previous versions of Arena Fairly cryptic, but gives quick view of lots of output data
• Get multiple reports for multiple replications
• “Half Width” columns – for confidence intervals
on outputs in long-run simulations … more later
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Build It Yourself (cont’d.)
• Place and connect flowchart modules
• Edit flowchart and data modules as needed
Experiment with Expression Builder – right-click in expression field
• Add plots, animation, artwork
• Add named views (? key or View / Named Views )
Name, hot key (case-sensitive) – useful in big models
• Edit Run/Setup dialog
• “Displays” in text
Compact way of saying what needs to be done in a dialog Omits Arena defaults Shows completed dialogs Docsity.com
Display for the Create Module
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Display for the Dispose Module
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Display for the Queue-Length Plot
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