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Represent the system of Dump Truck Problem using the model components and draw the flowchart for different events occurring in the system.
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  • Six dump trucks are used to haul coal from the entrance of a small mine to the railroad. Figure provides a schematic of the dump truck operation.

  • Each truck is loaded by one of two loaders. After loading, a truck immediately moves to the scale, to be weighed as soon as possible. Both the loaders and the scale have a first-come first-served waiting line (or queue) for trucks.

  • Travel time from a loader to the scale is considered negligible. After being weighed, a truck begins a travel time (during which time the truck unloads) and then afterward returns to the loader queue.

  • The distributions of loading time, weighing time, and travel time are given in Tables together with the random digit assignment for generating these variables using random digits.

  • The purpose of the simulation is to estimate the loader and scale utilizations (percentage of time busy). The model has the following components:

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