Hamed Mohammadi Andargoli - Science and Research Branch, Islamic Azad University
Nasser Shahsavari Pour - University of Valie-Asr
Reza Tavakkoli-Moghaddam - University of Tehran
Mohammad Hossein Abolhasani Ashkezari - Science and Research Branch, Islamic Azad University

Scheduling is a very important issue in the field of production management and optimization. The flexible job shop problem (FJSP) is a typical combinatorial optimization problem, which is attracted the attention of many researchers. Researchers often use the creative and innovative methods to solve NP-hard problems because of the huge solution space. In addition, the problem becomes more complex when multi-objective optimiza-tion is considered with conflicting objectives, and the accuracy of the solving method evaluates for solving this kind of problems. This paper addresses the FJSP with three objectives minimizing the makespan, maximal machine workload and total workload. We propose a new meta-heuristic algorithm, called cosmogony algorithm (CA), which is inspired by the process of evolution of organisms in the ecosystem and food chain in ecology science. It defines the process of evolution of organisms to achieve optimal (or near-optimal) solutions. The performance of the proposed algorithm is tested by numerical experiments on a number of representative problems, The computational results are proved that our proposed CA is an effective approach to solve multi-objective FJSPs.

Cosmogony Algorithm; Flexible job shop; Multi-objective ; Metaheuristics