Weighted tardiness minimization in job shops with setup times by hybrid genetic algorithm

Abstract

In this paper we confront the weighted tardiness minimization in the job shop scheduling problem with sequence-dependent setup times. We start by extending an existing disjunctive graph model used for makespan minimization to represent the weighted tardiness problem. Using this representation, we adapt a local search neighborhood originally defined for makespan minimization. The proposed neighborhood structure is used in a genetic algorithm hybridized with a simple tabu search method. This algorithm is quite competitive with state-of-the-art methods in solving problem instances from several datasets of both classical JSP and JSP with setup times