Intelligent material handling: development and implementation of amatrix-based discrete-event controller
Mireles, J., Jr.; Lewis, F.L.
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 6, Dec 2001 Page(s):1087 - 1097
Digital Object Identifier 10.1109/41.969387
Summary:A supervisory controller for discrete-event (DE) systems is
presented that uses a novel matrix formulation. This matrix formulation
makes it possible to directly write down the DE controller from standard
manufacturing tools such as the bill of materials or the assembly tree.
The matrices also make it straightforward to actually implement the DE
controller on a manufacturing workcell for sequencing the jobs and
assigning the resources. It is shown that the DE controller equations
plus the Petri net marking transition equation together provide a
complete dynamical description of a DE system. This means that a
computer simulation can be performed to check the DE performance of the
controller before it is implemented. In this paper, the authors
implement the DE controller on an actual three-robot intelligent
material handling cell at the Automation and Robotics Research
Institute, University of Texas at Arlington, USA. Then, they show that
the actual implementation and the simulated system give commensurate
results. The versatility of the system developed with this DE controller
permits implementing different methodologies for conflict resolution, as
well as optimization of the resource assignment and part throughput.
Technical information given includes the development of the controller
in LabVIEW and its simulation using MATLAB
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