1.Institute of Intelligent Vision and Image Information,China Three Gorges University,Yichang 443002 2.Department of Control Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074
Abstract The 2-dimensional layout optimization problem is studied, where the unequal weighted rectangles are required to be placed in a circular container without overlap. There are two objectives, minimum of the radius of the circle and equilibrium of the system. In most of the literatures, the local search heuristics is applied to the problem. However, the performance of the local search heuristics is not satisfactory. A constructive heuristics is proposed, named orderly positioning technique (OPT). A rectangle is placed close to an already deployed rectangle. Around the deployed rectangle, only finite configurations are considered. Then the time complexity of OPT is polynomial. The output layout of OPT is often with good performance, nevertheless the positioning order of OPT affects the quality of the layout a lot. Thus, a genetic algorithm (GA) to search for the optimal positioning order is designed. In the GA, the crossover operator and mutation operator are specially designed to keep the offspring having a valid placing order. The proposed algorithm is tested on the benchmarks with large-scale instances. The numerical results show that the proposed algorithm has better performance than the local search heuristics from literatures.
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2010, Vol. 23 
