Simulating the Production Line of Reinforcement Bars and Determining the nondominant Solutions for the Number of Cranes

Subject Areas : Futurology

Mohammadali  Afshar Kazemi ¹ (ندارد)
Mahmoud  Alborzi ² (ندارد)
Shadi  Mahjoubravesh ³ (ندارد)

Received: 2011-06-07 Accepted : 2011-10-17 Published : 2012-04-20

Keywords: Simulation, non-dominated solutions, mean waiting time, work cycle, productivity&#x0D, &#x0D, factor,

Abstract :

In this research, it has been attempted to model the production line of reinforcement barsusing discrete simulation modeling to determine the number of cranes required, considering therelevant factors such as, production line speed, failure rates of each machine and the spacerequirement. To achieve this, the production process was first investigated and an appropriatesimulation model was formulated using the Enterprise Dynamics (ED) simulation package. Therelevant data were then collected for each entity through time study. The sample size and thestatistical distributions were identified. To check for model validation, the simulation resultswere compared with actual data using statistical tests. To determine the desired number ofcranes and improve the production line performance, three indices i.e. output rate, productivityfactor and mean waiting time were determined through expert opinion and eight differentlayouts were constructed as alternatives considering the space constraint. All three indices weredetermined through simulation taking a reproducible approach. The weights of the criteria werecomputed using the Entropy technique and the alternatives were ranked using the TOPSISmethodology