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Performance-based comparison of control policies for automated storage and retrieval systems modelled by coloured Petri nets

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2 Author(s)
Dotoli, M. ; Dipt. di Elettrotecnica ed Elettronica, Politecnico di Bari, Italy ; Fanti, M.P.

The industrial manufacturing environment is nowadays characterized by fierce global competition, rapid market changes and short product life cycles. Such a complex scenario originated a vast demand for sophisticated techniques guaranteeing adequate planning and control of warehouses. A widely used solution is to adopt Automated Storage and Retrieval Systems (AS/RSs). A typical AS/RS comprises a number of parallel aisles with storage racks, serviced by automated stacker cranes and rail guided vehicles. This paper compares several management strategies addressing the system operational control, i.e., dealing with the AS/RS real time behaviour. A common coloured timed Petri net models the system and the controlled AS/RS operation is highlighted by way of several discrete event simulations carried out in the Matlab-Stateflow software environment. The proposed control policies are compared and discussed on the basis of appropriate performance indices.

Published in:

Emerging Technologies and Factory Automation, 2003. Proceedings. ETFA '03. IEEE Conference  (Volume:1 )

Date of Conference:

16-19 Sept. 2003

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