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An integrated non-cyclical preventive maintenance and production planning model for a multi-product production system

This paper integrates non-cyclical preventive maintenance and tactical production planning into a multi-product production system. In such a system, a set of products needs to be produced in lots during a specified finite planning horizon. Non-cyclical preventive maintenance is carried out at the end of some production periods and corrective maintenance is always performed at a failure. Both maintenance activities and setup result in downtime during the planning horizon. Procedures are proposed to discover the optimal production plan and preventive maintenance sequence simultaneously, our objective being to minimize the sum of maintenance, production, setup and inventory, backorder costs within the planning horizon. A real case from a steel factory is presented to illustrate the model.