Description of model’s process

This model simulates the operation of a grain terminal.

The cargo arrives by rail and by road. In the model there is provided 5 types of cargo. Wagons arriving at the terminal are already sorted and they are unloaded on a wagon unloading station. Cargo arriving by road goes through a procedure of weighing and sampling. If weight and quality corresponds to declared one, then this truck goes to a truck unloading station. If weight or quality does not correspond to documents, this truck goes away by special route. After having been unloaded in the truck or wagon unloading station, the cargo goes to conveyor systems and bucket elevators which make it go to silos or directly to a vessel (direct variant).  Allocation of cargo in silos is according to types of cargo.

Specifying such parameters as: a length of train formation, intensity of arriving of wagons, speed of unloading of wagons, intensity of arriving of trucks, a percent of discarded trucks, speed of unloading of trucks, proportional allocation of types of cargo in wagons and in trucks and a schedule of vessels’ arriving –  that all give a possibility to analyze as work of the whole facility, as work of particular parts of its knots, such as truck and wagon unloading stations, conveyor systems, shiploaders etc. It helps determine bottlenecks of the facility. Moreover there is a possibility to analyze a turnover of storage facilities by changing different parameters in the given model.

Technical description

The model is realized with multimethod simulation.

Model’s input parameters:

  • length of train formation;
  • frequency of wagons’ arriving (min.);
  • duration of wagons’ unloading  (min.);
  • quantity of cargo in one wagon (tons);
  • proportionality of allocation of types of cargo (for wagons);
  • frequency of trucks’ arriving  (unity/min.);
  • percent of discarded trucks (%);
  • duration of sampling (min.);
  • duration of truck’s unloading (min.);
  • quantity of cargo in one truck (tons);
  •   proportionality of allocation of types of cargo (for wagons);
  • speed of conveyor belts.

Output from the model:

  • diagram of cargo’s allocation by types arriving by road (tons);
  • diagram of arrived trucks’ allocation by types of cargo (unities);
  • diagram of cargo’s allocation by types arriving by rail (tons);
  • diagram of arrived wagons’ allocation by types of cargo (unities);
  • diagram of cargo rest at the grain terminal (tons).

Result of work

Thanks to the implementation of the dynamic changes of the input parameters the model makes it possible to analyze as particular parts of the terminal as the whole facility in general.