ARENA PROGRAM

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Part 1
F
ive identical machines operate
independently in a small shop. Each machine is up (that is,
works) for
between 7 and 10 hours (
uniform
ly distributed) and then breaks down. Ther
e are two
repair technicians available, and it takes one technician between 1 and 4 hours (uniformly
distributed)
to fix a machine; only one technician can be assigned to work on a broken machine
even if the other te
chnician is idle.
All up times and down times are independent of each other.
Starting with all machines at the beginning of an
“
up
”
time,
simulate
this
with ARENA
for
160
,000,000
hours and calculate:
1.
T
he time
-
average num
ber of machines that are down (in
repair or in queue for repair);
2.
T
he
average waiting time in queue for repair;
3.
The utilization of the repair technician as a group.
Part 2
For the problem in Part 1, a
ssume that each machine is up for 8.5 hours (exponentially
distributed) and the repair time is on the average 2.5 hours (exponentially distributed).
Simulate
this
with ARENA
for 160,000,000 hours.
Answer the
same
three ques
tions
given in Part 1.
Use the rate diagram to solve th
is problem
.
Show all the intermediate steps.
Summarize the
results from Parts 1 and 2 in a table
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