Eastern Mediterranean University
Department of Industrial Engineering
IENG461
Systems Modeling and Simulation
Computer Lab
ARENA 2
Two Process Work Station
With failure and capacity scheduling
 Jobs arrive randomly in the batches of 4 jobs and wait in the buffer while
the Drilling machine is busy. They are processed by the machine and leave
the system to the Packing machine after this process, the jobs leave the
system. Job interarrival times are exponentially distributed with a mean of
12 minutes, while Drilling times are exponentially distributed with a mean
of 2 minutes and Packing process takes exactly 2 minutes. There are some
failures in Drilling machine that uptimes are distributed uniformly with
min 100 and max 200 minutes and downtimes are exponentially
distributed with mean 1 minute. Also there are a scheduling in Packing
process such that in first 8 hours only one job can be processed at the
same time, but in the second 8 hours by adding another worker, we can
process 2 jobs at the same time with that machine. Simulate this model
for 1 replication and the length of simulation is 24 hours.
Two Process Work Station (Solution in ARENA)
 According to the first Lab note in ARENA we should define the model in
ARENA as you see:
Two Process Work Station (Solution in ARENA)
Defining the arrivals
 By double clicking on Create 1 we ca define the arrivals according to the
problem data in the window, by following these steps:
2
1
3
4
5
7
6
Two Process Work Station (Solution in ARENA)
Defining the Drilling Process
 By double clicking on Process 1 we will change the definitions according to
this order:
2
3
4
1
5
6
7
8
9
Two Process Work Station (Solution in ARENA)
Defining the Packing Process
 We will follow the same order also for Process 2:
2
1
4
3
7
8
6
9
5
Two Process Work Station (Solution in ARENA)
Defining the Departures
 By double clicking on Dispose 1 we will define this part, as you see:
2
1
3
Two Process Work Station (Solution in ARENA)
Defining the failure time for Drilling process
 We need to add the Advanced Process to the Project bar.
 We should define the failure in the Failure from Advanced Process.
 We should select defined failure for the resource that has failure.
 To do these steps, follow the next 3 slides.
Two Process Work Station (Solution in ARENA)
Defining the failure time for Drilling process
1
2
Select Advanced Process
3
Select Failure from Advanced
Process in the Project bar
4
Double click here to define new failure
Two Process Work Station (Solution in ARENA)
Defining the failure time for Drilling process
 Now, define the failure characteristics in the row 1 in the failure
spreadsheet and name it Drilling Failure:
1
2
3
4
5
6
Two Process Work Station (Solution in ARENA)
Defining the failure time for Drilling process
 Now, in the Project bar, Basic Process, Resources, we should select the
defined failure (Drilling Failure) for Drilling process:
1
3
4
5
2
Click here
Two Process Work Station (Solution in ARENA)
Defining the capacity scheduling for Packing process
 Which Schedule Rule should we select in ARENA????
 If the capacity decreasing schedule is large compare to capacity
increasing schedule, we select “WAIT” schedule rule.
 If the capacity increasing schedule is large compare to process time,
we select “IGNORE” schedule rule.
Two Process Work Station (Solution in ARENA)
Defining the capacity scheduling for Packing process
 Again in the Resource spreadsheet follow this order:
1
5
2
3
4
Name it
Packing
Schedule
Two Process Work Station (Solution in ARENA)
Defining the capacity scheduling for Packing process
 Now select Schedule from Basic Process and follow this order:
6
6
Add 2 new rows and fill
them according to the
problem
1
2
Select
the
defined
schedul
e
3
4
5
Right click here and
select
“edit via spreadsheet”
Two Process Work Station (Solution in ARENA)
Running the model
 Now from Run menu select setup and do the followings:
1
2
3
4
Two Process Work Station (Solution in ARENA)
Running the model
 Save your model in a specific folder.
 Again from Run menu select Check Model in order to check your model:
Two Process Work Station (Solution in ARENA)
Running the model
 Again using Run menu, select Go to run the model.
 You can see your needed results from Project bar.
Good Luck