Performance and performability evaluation of FMS using GSPN

Generalised stochastic Petri nets allow easy modelling of processes in a flexible manufacturing system. Due to the rich possibilities of this modelling concept, performance aspects and failure in this kind of systems can be investigated. Dependent on the goal of the analysis, pure performance or performance combined with availability, the evaluation procedure of the generalised stochastic Petri net has to be carefully chosen to get trustworthy results. Two models of an FMS, where one shows loss of machines, will be used to discuss the problems of a correct evaluation.