The use of modeling and simulation methods to improve the performance of manufacture lines

Abstract

The paper presents the results of the research in the field of manufacturing process management through modeling and simulation. The research object is the manufacturing process that is specific to the serial production, more specifically refers to the gas cooker manufacturing within a company in Oradea. For modeling and simulation, two methods were used: modeling with timed Petri nets and with queues. Models with Petri nets have been developed gradually. In a first variant, for each operation was considered a single workstation, the operation being modeled by a timed transition whose timing was equal to the time of execution of the operation. The second Petri model was designed to remove these bottlenecks. After removing the bottlenecks, the next level of development was to model the stock of parts and subassemblies associated with each workstation. In the fourth variant with the Petri nets, the supply sequences of parts and subassemblies were also defined. The modeling with queues has made possible to highlight the bottlenecks and occupancy rate of each workstation. Also, a model has been developed in which the execution times of the operations are considered randomly.