Applications of discrete-event state equations to manufacturing systems

The paper addresses the problem of modelling and controlling manufacturing systems within the framework offered by the Manufacturing Algebra (MA). The method is outlined through a case study, including production micro- and macro-irregularities. The design of a hierarchical real time controller capable of satisfying the demand of finished products arising from an unpredictable factory planner is afforded. The dynamic model of the production process and the real time control strategies are entirely event-driven. The underlying formulation is provided by a novel discrete event state equation theory developed within MA. Control performances are proven with an event-driven simulator based on the MA, and capable of simulating in a very detailed way all the irregularities the control system has to attenuate.