Description of model’s processes
Given model simulates the operation of railway unloading station of the grain terminal. The cargo arrives by rail. First of all a locomotive brings a wagon batch to the railway station and leaves it in front of the dynamic wage scales Then the locomotive has to be uncoupled from the wagon batch and the locomotive goes to the end of the same wagon batch to be coupled there. After that the locomotive pushes the given wagon batch through the dynamic wage scales at the minimum speed and after getting through it the weight of each wagon has to compared with the weight it should be according to delivery notes.
If the weight does not correspond (gray wagons), then there starts maneuvers on the railway station for the purpose of sorting out all wagons which are not corresponding by weight and to move them in a specially designed railway for such wagons. Wagons which have no problems by weight will be pushed by locomotive to the railway unloading station where they will be unloaded. The grain unloaded with the railway unloading station gets to the conveyer belts’ system and bucket elevators where the cargo goes to silos. There are three silos in the model. After unloading the locomotive takes empty wagons and moves them in a specially designed railway for empty wagons. At the same time a new wagon batch loaded with grain arrives to the terminal and the cycle starts again by the same scenario. When there is a necessary batch of empty wagons then the locomotive takes them away from the terminal. The same thing happens with wagons discarded by weight.
The model is realized with a discrete-event simulation.
Model’s input parameters:
- number of wagons in the train formation (from – to), (specified)
- amount of grain in one wagon
- capacity of each silo
- time of unloading
- average percent of wagons discarded by weight
Data output from the model:
- a number of wagons arrived on the terminal
- a total number of wagons;
- wagons discarded by weight
- “good” wagons
- average time of silo’s filling
- a number of silos filled with cargo
- amount of grain which was unloaded
Result of work
Thanks to this model it is possible to analyze the operation of given railway unloading station with different input parameters.