Open Shop Scheduling with Assembly Stage: Gray Wolf Algorithm and Lagrangian Relaxation

Document Type : Research Paper

Authors

1 Msc, Department of Industrial Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran

2 Professor, Department of Industrial Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran

Abstract

In this research, the open shop scheduling problem has been discussed. In this environment, scheduling for jobs and planning for assembly operations are usually considered independently. However, it may not lead to the best results for the entire production system. On the other hand, the problem of assembly planning has many applications in industries and has recently attracted the attention of researchers. Since in the models that were used before, the assembly operation is not integrated in the open shop scheduling, in this research, inspired by the real production units and to bring the model closer to the real world, the assembly operation is included, which is a step after the completion of the production process. To solve this problem, after modeling it, the Lagrangian relaxation method is used to solve problems in medium dimensions and the gray wolf algorithm is used in large dimensions. Next, to check the quality of the results obtained from the gray wolf algorithm, the Lagrangian relaxation method and GAMS outputs in small-size instances and simulated annealing algorithm in large-size instances have been compared. The obtained results show that the solutions obtained from the proposed algorithm are of good quality.

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Main Subjects


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