The simulation is constructed with various kinds of
Extend blocks identified by their graphical icons.
Most blocks have parameters that are set by double clicking
on the block. In the example, the blocks have been labeled
for discussion purposes.
The Generator block creates parts that pass
through the simulation. The Rand block determines
the probability distribution of the interarrival times.
In this case the block is labeled Beta Dist. to indicate
that the interarrival times have the Beta distribution.
Once created, parts pass from the Generator block into
the FIFO Queue. The Activity-Mult block
simulates the production activity. In this model the
number of servers, or machines, is set in the field
at the upper right to 3. The service time is governed
by the Rand block connected to the Activity-Mult.
The service distribution selected for the example is
the exponential distribution with mean 0.5.
After service completion, the part passes to the Exit
block. This particular simulation was setup to make
50 separate runs, each run consisting of 100 events.
An event is either an arrival or a service. The number
shown within the Exit block is the number of parts that
left the system during the last simulation run
48. Since the total number of events was 100, then 52
must have entered the system. When the simulation terminated,
4 parts remain in the service activity and queue.
Statistics on the simulation runs are discovered by
opening the Notebook or by double clicking the
Queue Stats or Activity Stats blocks.
The results are presented for each run individually.
Confidence limits on mean values can also be displayed.
The model provides access to some system parameters
in the fields at the upper right. Other characteristics
are set by the parameters within the blocks. Simulation
characteristics are set with the Simulation Setup
dialog in the Run menu.