Packing a trunk: now with a twist!

In an industry project with a German car manufacturer we are faced with the challenge of placing a maximum number of uniform rigid rectangular boxes in the interior of a car trunk. The problem is of practical importance due to a European industry norm which requires car manufacturers to state the trunk volume according to this measure. No really satisfactory automated solution for this problem has been known in the past. In spite of its NP hardness, combinatorial optimization techniques, which consider only grid-aligned placements, produce solutions which are very close to the one achievable by a human expert in several hours of tedious work. The remaining gap is mostly due to the constraints imposed by the chosen grid. In this paper we present a new approach which combines the gridbased combinatorial method with Simulated Annealing on a continuous model. This allows us to explore arbitrary orientations and placements of boxes, hence closing the gap even further, and – in some cases...

• Type: Conference
• Year: 2005
• Where: SMA
• Authors: Friedrich Eisenbrand, Stefan Funke, Andreas Karrenbauer, Joachim Reichel, Elmar Schömer
• Keywords: Car Manufacturers, Car Trunk, SMA 2005, Trunk Volume