21-30

• Murino, Teresa
• Romano, Elpidio
• Zoppoli, Pasquale

In production, stops due to maintenance create imbalances within the system. Let's assume that you have aseries of n machines and that the i stops. In this case the i+1 would be able to continue to work only as long as stocks wereavailable on the machine, while the i-1 could continue to work only if there was the possibility that its production would beat least temporarily placed on the machine. Therefore it is normal in order to contain the system imbalances, due tomaintenance stops, introduce some buffers. In this paper we propose a simulation model to define the optimal dimension ofthe buffer, with regards to the maintenance policy that is applied to the production system. The model can simulate asystem of units that can have very different characteristics, such as productivity or reliability, and also we can simulate aninter-operational buffer between them. The model is based on the concept of thresholds which, when crossed by theparameter of wear, determine different maintenance interventions. The cost optimization consists in determining, bysimulation, at what value the thresholds should be fixed to minimize the overall maintenance cost. We use the model todetermine the buffer dimension trend depending on the cost of the buffer.

• Economics and Business

• Production functions (Economic theory)
• Business management

maintenance buffer, condition based maintenance, simulation, buffer, optimization

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