Integrated Assembly Job Shop Scheduling Considering Fuzzy Operation Time

In this study, a method of integrated assembly job shop scheduling considering fuzzy operation time (IAJSS-FOT) is proposed to minimize the fuzzy total production completion time and the fuzzy total inventory time. In this method, part processing and assembly sequences are optimized simultaneously and a triangular fuzzy number is used to describe fuzzy operation time in processing process and assembly process. A hybrid chromosome encoding structure with processing and assembly operation is designed and NSGA-II is used to solve the problem. With a case study, the validity of the proposed method is verified.