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14. A Simple Model of The Carwash System
Vehicles arrive into a carwash shop to get a simple wash and clean up.
The Carwash system consists of a single wash machine, which provides
the actual service to the vehicles. Arriving vehicles join a line to wait for
service. The vehicle at the head of the line is the one that is next to be
serviced by the carwash machine. After the vehicle wash is completed,
the vehicle leaves the system. The vehicles are considered the
customers of the system, as they are the entities requesting service by
the server (the wash machine). shows a graphical view of the
conceptual model of the Carwash system. The arrival of vehicles occur
randomly and the time between arrivals (the inter-arrival intervals)
follow the behavior represented by an exponential probability
distribution with mean value of 7.5 in minutes. The data for the
module could also be filled in the spreadsheet view, below the model
workspace.
Mean Value 11.25
Std dev 1.25
This program will run for 14h
24. When Simulation is the Appropriate Tool
Simulation enables the study of, and experimentation
with, the internal interactions of a complex system, or
of a subsystem within a complex system.
By inputs and observing the resulting outputs,
valuable insight may be obtained into which variables
are most important and how variables interact.
Simulation can be used to verify analytic solutions.
Animation shows a system in simulated operation so
that the plan can be visualized.
26. When Simulation is not Appropriate
When the problem can be solved using common
sense.
When the problem can be solved analytically.
When it is easier to perform direct experiments.
When the simulation costs exceed the savings.
When the resources or time are not available.
When system behavior is too complex or can’t be
defined.