A distributed architecture for reconfigurable control of continuous process operations |
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Authors: | Nirav Chokshi Duncan McFarlane |
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Affiliation: | (1) Institute for Manufacturing, University of Cambridge, 16 Mill Lane, Cambridge, CB2 1RX, UK |
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Abstract: | This paper considers a new distributed approach to reconfigurable control of continuous process operations such as in chemical
plants. The research is set on a premise that emerging business pressures of product customization and industrial globalization
will lead to increased need for reconfigurability in process plants. The ability of processes to support dynamic and smooth
reorganization of process schemes in tandem with the changing requirements of supply chains will become important in future.
Conventional control approaches based on hierarchical architectures are limited in dealing with such emerging requirements
due to their inflexible structures and operating rules. Instead, more distributed approaches are required which can support
increased level of reconfigurability in control systems, especially at the lower levels in hierarchy where the visibility
to disturbances remains high. In this paper, one such distributed approach is considered based on the concepts of holonic
manufacturing and supply chain management. The proposed approach distributes the functionality of process control into several
reconfigurable process elements. These elements, while having a stand-alone capability for making their own control decisions,
are also able to reconfigure themselves into alternative process schemes which evolve with the changing requirements of production.
An analogy between process plants and so-called dynamic supply networks or virtual enterprises is used in this paper to define the composition of reconfigurable process elements and their operations. The proposed approach
is shown to offer improved process control system reconfigurability and a control architecture which is compatible with the
supply chain management needs at the next higher level. The purpose of this paper is qualitative and motivational. It is aimed
to propose a new research direction in the field of reconfigurable process control. |
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Keywords: | Reconfigurable control Holonic manufacturing Supply chain management Virtual enterprise Distributed control |
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