[Legacy Report] IEEE SMC and CS Chapter Seminar
From Tweets to Optimality in the Smart and Sustainable Factory
Bengt Lennartson, Ph.D. & Professor
Chalmers University of Technology, Gothenburg, Sweden
Time: 3:30pm-4:30pm, Fri., December 12, 2014
Place: ECEC 202, New Jersey Inst. of Technology
Abstract: The ``tweeting factory'', a new event-based information system architecture, is presented. Simple messages (tweets) from all kinds of equipment are stored as events, only including identity, time tag and unstructured data. These low level events are combined into high-level knowledge, using formalized transformation patterns, stream-based aggregation, and prototype-oriented information models. Based on this event information architecture, hierarchical discrete event models are generated in terms of self-contained operations and operation sequences. Optimal sequences are then generated for moving devices, especially focusing on novel methods for energy optimization. A set of moving devices, for instance a multi-robot system, can be considered as a hybrid system, including continuous movements and high-level discrete interactions. A generic modeling framework for hybrid systems is therefore introduced based on modular predicate transition models. Efficient energy optimization is then obtained, applying suitable abstractions and a recent integrated constraint and nonlinear programming procedure. Abstractions for pure logical models, such as automata and Petri nets with variables, are also presented based on branching bisimulation. Integrating the tweeting factory with self-contained operations and optimal as well as logically correct sequences of operations results in a smart factory, characterized by flexibility, scalability, efficiency, reusability and sustainability in terms of minimal energy consumption.
Biography: Bengt Lennartson received the Ph.D. degree in automatic control from Chalmers University of Technology, Gothenburg, Sweden, in 1986. Since 1999, he has been a Professor of the Chair of Automation, Department of Signals and Systems. Currently he is Associate Editor for IEEE Transaction on Automation Science and Engineering, General Chair of CASE 2015 and Program Chair of ADHS 2015. He received Best Student Paper Award at CASE 2012, and the Best Conference Paper Finalist Award at CASE 2010. Prof. Lennartson is (co)author of two books and more than 230 peer reviewed international papers. His main areas of interest include discrete event and hybrid systems, especially for manufacturing applications, as well as robust feedback control.
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