Contribution to the Maintenance of Manufacturing Systems with Time Constraints Using Fuzzy Petri Nets
نویسندگان
چکیده
The aim of this paper is the study and the design of a maintenance module based on Petri nets (PNs) for manufacturing job-shops with time constraints. In such systems, operation times are included between a minimum and a maximum value. In this context, we propose a new fuzzy Petri net called Fuzzy Petri Net for maintenance (FPNM). This tool is able to analyze monitoring and recovery tasks of a discrete event system with time constrains, using a temporal fuzzy approach. The maintenance module is consists of P-time PNs and fault tree. The first is used for modelling of normal behaviour of the system by temporal spectrum of the marking. The second model corresponds to diagnosis activities. Finally, to illustrate the effectiveness and accuracy of proposed maintenance approach, two industrial examples are depicted. Keywords— Fuzzy numbers; P-time PN; Fault Tree; Alpha-cut; FPNM; Recovery.
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