Optimizing Container Movements Using One and Two Automated Stacking Cranes
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The number of containers shipped through ports has increased substantially in recent years and has stimulated research and development of ways to improve storage yard operations. The productivity of a ports storage yard depends, in part, on the cranes that are working in storage blocks. Each crane follows a route described primarily by the order to move each container that enters or leaves a block and the position to stack each container in the block. Each container that leaves enters the block must be unloaded loaded in a limited capacity transfer point before after a given time. This thesis is the first to develop Integer Linear Programs ILPs to prescribe routes for one and two equal sized Automated Stacking Cranes ASCs in a single block working with straddle carriers to load and unload containers from the transfer points. Using real world data, we construct test problems varying both the number of container bays length and excess capacity of each block. We find one ASC working alone over four hours requires up to 70 more time than two ASCs working together to accomplish the same required container movements. ILP solution time is typically only a few seconds.
- Construction Equipment, Materials and Supplies
- Containers and Packaging