Ezzat Atarodi - dept. Mazandaran university of science and technology
Javad Rezaeian - dept. Mazandaran university of science and technology
Ali Taheri - dept. Mazandaran university of science and technology

This paper develops an integrated model for flexible job shop scheduling problem with the maintenance activities. Reliability models are used to perform the maintenance activities. This model involved twoobjectives: minimization of the makespan for flexible job shop production part and minimization of system unavailability for the PM (preventive maintenance) part. To aim the objectives, two decisions must be taken at the same time: assigning jobs on machines in order to minimize the makespan and finding the appropriate times to perform PM activities to minimize the system unavailability. These objectives are obtained with considering dependent machine setup times for operations and release times for jobs. Inadvance, the maintenance activity numbers and PM intervals are not fixed

component; Scheduling; flexible job shop; preventive maintenance; reliability;makespan;unavailability