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A structure-function-control paradigm for knowledge-based modeling and design of manufacturing workcells
Authors:Stefano Caselli  Constantinos Papaconstantinou  Keith L Doty  Shamkant Navathe
Affiliation:(1) Dipartimento di Ingegneria dell' Informazione, Università degli Studi di Parma, Italy;(2) Department of Electrical Engineering, University of Florida, 32611 Gainsville, Florida, USA;(3) College of Computing, Georgia Institute of Technology, USA
Abstract:This paper discusses the integration of structural, functional and control knowledge in manufacturing workcell modeling, simulation and design. After an overview of applications of semantic and object-oriented data models in the manufacturing domain, issues relating to the control synthesis for manufacturing workcells are presented. In particular, a data model encompassing functional and control features, along with application domain structural knowledge, is developed. This model assists in explicitly representing the control aspects of engineering design within an object-oriented database and supports a task-level, functionality-driven, manufacturing workcell design. Since manufacturing workcells consist of a number of elements interacting in a complex manner, workcell control design is one of the most difficult steps in the workcell design procedure. Message passage, commonly used in object-oriented databases, provides no explicit modeling of the database behavior. Hence, it can not serve as a tool for the design of system control. On the other hand, Petrinets (PN) have proven successful in describing complex interaction among active agents. This paper will explore the incorporation of Petri nets as a basis for describing application control knowledge within a structure-function-control data model.
Keywords:Automation  database  object-oriented models  petri nets  semantic networks
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