Routing general cargo ships considering the stowage in the holds and the balance of ships in the bow-stern and port-starboard directions
DOI:
https://doi.org/10.58922/transportes.v33.e2942Keywords:
Maritime transport, General cargo, Vehicle Routing, Cargo stowageAbstract
Exporters of break bulk cargos such as marble and granite blocks, cellulose bales and lumber generally charter general cargo ships for a certain period, during which they can carry out several voyages for sea transport. Therefore, they need to plan trips and load storage in the ships' holds, seeking to reduce freight and navigation costs. This article proposes a mathematical model that defines, in an integrated way, the ships' trips and the storage in the holds, aiming to minimize these transport costs. The model jointly considers multiple trips, multiple compartments, unloading sequence, 3D rotation of items and ship balance during loading, which has not been found in the literature so far. Tests carried out with the CPLEX solver considering an exporter of granite blocks showed that arrangements with 3D rotation can reduce the number of trips and that the model is capable of representing the transport of parallelepiped items in the holds of general cargo ships, considering the unloading sequence and balance of ships in loading.
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