Mind Map Gallery Extendsim Examples
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Extendsim Examples
This is a mind map that contains information about the extendsim examples.
Edited at 2020-10-12 03:36:34
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- Outline
Extendsim Examples
Measures
wait time
queue modeling blocks
utilization
resource blocks
Count Items block
number of items that routethrough a certain path
various statistics blocks
don't need to be connected;just present
collect data from blocks thathave a delay or processingtime (Operation, Stack, etc.)
Queue Stats block
from DE lib
ave queue length, max Qlength, ave wait, max wait time
Resource Stats block
from DE lib
collects from resourcetypeblocks like Repository, LaborPool
resource utilization
Costs Stats block
from DE lib
info on costing blocks like Operations
cost per item, cost per unit oftime, total cost
Cost by Item block
from DE lib
cost info for every block that passesthrough the block (must beconnected)
cost of each item
connectors
average cost
current cost
total cost
Mean & Variance block
calcs average and std dev forthe simulation
connect to plotter to see ave over time
Activity Stats
Plotters
Plotter, DE block
four inputs on discrete events
value
time value (when it happened)
use Show Instantaneous Lengthoption if connected to L onStack
Histogram
connect L from Stack
Length column is length of queue
adjust bins; often 6
Special Blocks
Executive
must farthest to the left
required for all simulations
controls timing and passing of events
Input Random Number block
from Generic lib
uses probability distributions
connect to D input onOperations block (delay)
Models share certain concepts
Selection of time units
Length of a run
Number of runs
Model verification
Model validation
Batching
Operation block
Batch block
batch up to three items into asingle output
Unbatch block
separate up to three item
used to separate resource from the item soitem can go forward and resource back topool
when batch/unbatch, checkPreserve Uniqueness
Items
Import block
generates arrivals
specify arrival pattern
specify amount per arrival
alternative would be Generator block
Input Data block
changing arrival rate basedon exponential distribution
Program block
schedule specific arrivals atspecific times
Attributes
set via
Input block
easiest
Operation block
Repository block
Labor Pool block
Program block
Set Attribute blocks
carry through entire process
Prioritizing items
Stack block
choose type of stack
other methods?
Repository block
holding area (think inbox)
can start with some items
assign attribute and priority asthey leave
can't measure wait time; useStack block instead
items leave FIFO
Export block
Operations block
simulates an activity
delays item passing through
delay time constant unlessInput Random Number isattached
Transaction block
alternative to Operations formodeling parallel servers
also used to model multiplesimultaneous activities
Block types
model activities
model resources
model routing
collect data
calculate stats
display output
Model Building Steps
Determine goals
Understand process to be modeled
Draw a block diagram of process
Specifiy parameter values
Define logic of model and connections
Validate the model
Add data collection andgraphical analysis
Analyze output and draw conclusions
Activity blocks
Transaction block
allow for parallel processing
Activity Multiple block
allow for parallel processing
used to model transportationactivities like mailing, emailing,faxing docs