Solving the Pallet Loading Problem
Martins, Gustavo H.A.
Dell, Robert F.
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This paper presents new bounds, heuristics, and an exact algorithm for the Pallet Loading Problem (PLP). PLP maximizes the number of boxes placed on a rectangular pallet. All boxes have identical rectangular dimensions and, when placed, must be located completely within the pallet. Boxes may be rotated 90 degrees so long as they are placed with edges parallel to the pallet's edges. The set of all PLP instances with an area ratio (pallet area divided by box area) less than 101 boxes can be represented by 3,080,730 equivalent classes. Our G5-heuristic finds optimal solutions in 3,073,724 of these 3,080,730 classes and in the remaining 7006 classes only differs from the best known bound by one box. We develop three other heuristics that solve another 54 instances. Finally, we solve the 6952 remaining classes with our exact HVZ algorithm. Only a subset of these classes has been solved previously.
European Journal of Operational Research, 184, 2008, pp. 429-440.The article of record as published may be located at http://dx.doi.org/10.1016/j.ejor.2006.11.012
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