PROCESS MODELING AND FAULT DIAGNOSIS OF FLEXIBLE ASSEMBLY SYSTEMS USING PETRI NET
David Lira Nuñez, Escola Politécnica, Fabrício Junqueira, Paulo Eigi Miyagi · 2005
A significant part of the activities in a manufacturing system involve assembly tasks. Nowadays, these tasks are object of automation due to the market increasing demand for quality and variety of products. Them, assembly system automation must be also flexible to cope product diversification, functionality, delivery time and volumes involved. However, these are vulnerable to faults due to the physical characteristic systems of their components and the complex interaction among their parts. In this context, current researches are focused on the project and control of Flexible Assembly Systems (FAS) considering the occurrence of faults. The proposed procedure structures the development of models assembly process and the fault diagnosis, based on the theory for Discrete Events Systems (DES) and Petri net (PN). The Production Flow Schema/Mark Flow Graph (PFS/MFG) technique is then applied to describe and specify the FAS control system through a rational and systematic procedure.