HIERARCHICAL PERFORMANCE-ORIENTED CONTROL OF FLEXIBLE MANUFACTURING CELLS

Sherif Fahmy, Subramaniam Balakrishnan, Tarek ElMekkawy

2009

Abstract

Abstract: In a job shop, each product may have a different processing route through the system. Automated Flexible Manufacturing Cells (FMC) that adopt this flow pattern are highly prone to deadlocks. A supervisor is a controller that uses available data via feedback loops to characterize the current behavior of the cell, and modify the equipment controllers to achieve the desired operational specifications in a deadlock-free manner. This paper proposes a hierarchical control system divided into an upper level scheduler and a lower level supervisor to control FMCs. The scheduler is responsible for determining a deadlock-free allocation of the resources that optimizes some performance measure, based on the current production requirements, and the supervisor guarantees that the flow plan (behavior) determined by the scheduler is realized on the shop floor. For that purpose, a formal method that can transform a production schedule into a supervisor, in real time, is also proposed. The supervisor is an augmented Marked Graph (MG) that captures all the events that can take place in the cell. The proposed approach is validated by generating and simulating the supervisors for two benchmark problems.

Paper Citation

in Harvard Style

Fahmy S., Balakrishnan S. and ElMekkawy T. (2009). HIERARCHICAL PERFORMANCE-ORIENTED CONTROL OF FLEXIBLE MANUFACTURING CELLS . In Proceedings of the 6th International Conference on Informatics in Control, Automation and Robotics - Volume 3: ICINCO, ISBN 978-989-8111-99-9, pages 329-332. DOI: 10.5220/0002169103290332

in Bibtex Style

@conference{icinco09,
author={Sherif Fahmy and Subramaniam Balakrishnan and Tarek ElMekkawy},
title={HIERARCHICAL PERFORMANCE-ORIENTED CONTROL OF FLEXIBLE MANUFACTURING CELLS},
booktitle={Proceedings of the 6th International Conference on Informatics in Control, Automation and Robotics - Volume 3: ICINCO,},
year={2009},
pages={329-332},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0002169103290332},
isbn={978-989-8111-99-9},
}

in EndNote Style

TY - CONF
JO - Proceedings of the 6th International Conference on Informatics in Control, Automation and Robotics - Volume 3: ICINCO,
TI - HIERARCHICAL PERFORMANCE-ORIENTED CONTROL OF FLEXIBLE MANUFACTURING CELLS
SN - 978-989-8111-99-9
AU - Fahmy S.
AU - Balakrishnan S.
AU - ElMekkawy T.
PY - 2009
SP - 329
EP - 332
DO - 10.5220/0002169103290332