SCHEDULING OF PRODUCTION AND MAINTENANCE ACTIVITIES UNDER RELIABILITY CONSTRAINT

This paper deals with a joint scheduling of product ion and preventive maintenance activities in the ju stin-time context. We propose two mathematical models and a simulation model which are able to consider th maintenance and production views of a production system. The proposed models coordinate the two views so tha t the sum of maximum weighted earliness and tardiness cost is mi nimized. The mathematical models are evaluated on o ne machine/component subject to preventive maintenance w ithout considering breakdowns. The simulation model is evaluated in the same context but is also able to take b reakdowns into consideration. Thanks to its modular conception it is also able to easily consider several machines/compo nents with no modification of its internal function ing. The dynamic aspects are modelled by a combination of timed petr i-n ts and PDEVS models and implemented in the VLE simulator.