Dynamic reconfiguration of manufacturing systems based on MNRS

The manufacturing system under the smart manufacturing model is required to timely respond to the changing customization and individuation production demand of diversified small-lot products through quick dynamic reconfiguration. For the general Petri net with different input/output functions and non-conservative Tokens,a modified net rewriting system(MNRS) is proposed according to the production process on the basis of NRS. Reconfiguration cells in the rule class library of MNRS are encapsulated systematically and modularly based on the manufacturing process of the products,and the corresponding boundary coupling and internal enabling rules of the reconfiguration area are formulated. The class library with reconfiguration cells in MNRS has the characteristic of behavioral property inheritance,which can guarantee the liveness,boundedness and reversibility of the manufacturing system after the local area reconfiguration,so that the autonomous,quick and dynamic reconfiguration of the manufacturing system can be achieved according to the rewriting rules and reconfiguration mechanism of MNRS. Simulation results and application cases verify the usability of MNRS.