S. Raggl, A. Beham, F. Tricoire, M. Affenzeller - Solving a Real World Steel Stacking Problem - International Journal of Service and Computing Oriented Manufacturing, Vol. 3, No. 2, 2018, pp. 14
We present a real world steel slab stacking problem. The problem
features continuous production and retrieval and non-instantaneous crane
movements. There are stacking constraints, based on dimensions, weight and
temperature of the slabs and temporal constraints based on the casting schedule,
the delivery due times as well as the availability of rolling pallets for transport.
We present a prioritisation heuristic for the possible crane movements. Based on
this heuristic we build a branch and bound solver as well as a greedy look-ahead
heuristic.We evaluate the heuristics using randomly generated problem instances of various sizes with the same characteristics as the real world problem and find
that the greedy look-ahead heuristic outperforms the branch and bound approach
when using realistic time limits.