Basic Operations in Arena
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Transcript Basic Operations in Arena
Chapter 4
Modeling Basic Operations & Inputs
1
Outline
detailed
operations
Model
04-01
Model 04-02
Model 04-03
Model 04-04
general
usage of ARENA
2
A Sequence of Related Models
Model 4-1: a sealed electronic assembly and test
system
more features,
Model
4-2: additional features in scheduling,
failure, and states of resources
Model 4-3: more advanced animation
Model 4-4: advanced features in moving –
stations, routes, and animation
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An Electronic Assembly/Test System
Part A
EXPO(5)
Process A
Tria(1,4,8)
Scrapped
Part A
TRIA(1,3,4)
20%
Rework
Part B WEIB
(2.5, 5.3)
EXPO(45)
9%
Sealer
80%
Salvaged &
Shipped
Part B
Process B
91%
Batches of 4
EXPO(30), de- Tria(3,5,10)
batch on arrival
Shipped
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An Electronic Assembly/Test System
Part A
EXPO(5)
Process A
Tria(1,4,8)
Scrapped
Part A
TRIA(1,3,4)
20%
Rework
Part B WEIB
(2.5, 5.3)
EXPO(45)
9%
Sealer
80%
Salvaged &
Shipped
Part B
Process B
91%
Batches of 4
EXPO(30), de- Tria(3,5,10)
batch on arrival
Shipped
processes
type-dependent
unreliable
system
create batches
service
times chance
create
entities
of 4 the
entities
&
to determine
number
of racks statistics
de-batch later
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Model 04-01
ignore
details
the
2-minute traveling times
the working hours of stations
schedule of the re-workers
failure of the sealer
the number of racks used
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Remarks for Model 04-01
two
types of entities
entity-dependent service time: an attributes of
an entity: a local variable of the entity
time in system: marking the time entering the
system
chance: conditional routes
type dependent statistics: record mechanism
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Model 04.02
8
New Features of Model 04-02:
Refinements of Model 04-01
run length 10 days, 16 hours per day
two 8 hr shifts / day
1 re-worker in the first shift
2 re-workers in the second shift
sealer may break down
life time expo(120)
repair time expo(4)
statistics of the status of sealer: on and off
statistics of the rework queue (distribution of # of racks)
each rack possible to hold 10 items
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Schedule of the Rework Station
run
length: Setup menu
variable resource
define
schedule of re-workers (Schedule module)
modify
the # of hours per day to suit the schedule
associate
the schedule with the (resource of the)
re-work station
option
on resource when a service is interrupted: ignore,
wait, preempt
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Failure of Resource
failure
of the sealer
define
a failure (Failure module in Advanced
Processes)
associate the failure with a resource
the treatment of incomplete work at a failure
same
as schedule: ignore, wait, and preempt
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Collect Statistics
statistics
time
in system: customer average
sealer:
rack:
state dependent, time average
number of rack needed, time average
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Collect Statistics
to get time-in-system statistics of a type of entities
(customer-average statistics)
use Record module
record exit time - creation time
compile statistics
to get time-persistent statistics of a collection of values of
variables or a collection of states of resources
use Statistics module (in Advance Process Template)
may need to self-define categories
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Statistics for Racks and for Sealers
time-persistent statistics – Statistic module
statistics on sealer status
fraction
of idle, failed, and busy time of sealer
statistic
type: frequency (not time-persistent)
statistics on number of racks needed
fractions
statistic
of time for different number of racks used
type: frequency (not time-persistent)
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Instantaneous Utilization
and Scheduled Utilization
for
a resource, let
B(t)
= # of units of the resource busy at t
M(t)
= # of units of the resource available at t
instantaneous
utilization
T B(s)
0 M ( s ) ds
T
scheduled
utilization
T
0 B( s) / Tds
T
0 M ( s) / Tds
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T
0 B( s)ds
T
0 M ( s)ds
Model 04.03
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New Features of Model 04-03:
Refinements of Model 04-02
animation
length
of queues
and points of queues
changing
creating
entity pictures
new one: copy, edit, and assign entity
picture
adding
resource pictures
creating
adding
resource picture from animation tool bar
variable plots
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Model 04.04
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New Features of Model 04-04:
Refinements of Model 04-03
saving connection links by station and route modules
stations: module for program and icon for animation
route: module for program and link for animation
possible to have multiple station icons in animation for one
location
two station icons between one route link in animation
changing an entity picture: by an Assignment Module
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