Production systems modelling by means of Petri nets

Abstract

The paper deals with the problem of graphical modelling of the activities of production systems with robots and manipulators. These models allow two kinds of examinations. The first one is aimed of the determination of the smallest number of elementary processing cycles of the entry of the robotic technological complexes (RTC) to ensure that no collision occurs in the course of the processing of two subsequent parts. The second task consists of examining the minimum number of elementary technological steps ( Delta t) necessary to process an individual part in the course of its passage through the RTC in the case that part X follows the preceding part Y at the entry of the RTC. The applied mathematical model is based on weighted Petri networks (WPN), introducing a transformed graphical model of the RTC, having been compiled initially at the level of elementary technological activities.<>