Int. J. of Industrial and Systems Engineering   »   2010 Vol.5, No.2

 

 

Title: Stochastic cycle time analysis in robotic cells

 

Author: Kouroush Jenab, Kaveh Salehi-Gilani, Sareh Shafiei-Monfared

 

Addresses:
Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada.
Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada.
Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada

 

Abstract: The purpose of this study is to analyse the cycle time in a single part type robotic cell. The robotic cell is made up of several machines and a single gripper robot that loads, unloads the machines and moves the part between machines. The cell can be classified into flow- and open-shops based on the part sequence and robot move. When number of machine is increased, the cycle time analysis in a robotic cell can lead to an NP-complete problem, which remains a challenge in existing literature. In addition, the problem complication rise by having stochastic processing time in the cell. In this study, we have developed a formula for decrease (increase) structure that part processing sequence is based on decrease (increase) order of manufacturing process time. This leads to a virtual robotic cell, which its machines are virtually arranged in order of processing time regardless of their physical location. In addition, using flow-graph concept, a model is developed to calculate the cycle time of a robotic cell where the part processing time element is stochastic. This model provides parametric results for expected value of and variance of the cycle time, which can be used for evaluating the productivity of the scenarios.

 

Keywords: cellular manufacturing; cycle time; flow graph; flow shops; open shops; productivity analysis; robotic cells; manufacturing cells; virtual cells; processing time; productivity evaluation; robot handling.

 

DOI: 10.1504/IJISE.2010.030744

 

Int. J. of Industrial and Systems Engineering, 2010 Vol.5, No.2, pp.129 - 142

 

Available online: 01 Jan 2010

 

 

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