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Träfflista för sökning "LAR1:cth ;pers:(Fabian Martin 1960)"

Sökning: LAR1:cth > Fabian Martin 1960

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  • Adlemo, Anders, 1957-, et al. (författare)
  • Towards a True Flexible Manufacturing System
  • 1994
  • Ingår i: Proc of the 10th ISPE/IFAC Int. Conference on CAD/CAM, Robotics and Factories of the Future, CARS & FOF '94, Ottawa, Canada. ; s. 401-410
  • Konferensbidrag (refereegranskat)
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  • Andersson, Kristin, 1976-, et al. (författare)
  • Coordination of Operations by Relation Extraction for Manufacturing Cell Controllers
  • 2010
  • Ingår i: IEEE Transactions on Control Systems Technology. - 1063-6536. ; 18:2, s. 414-429
  • Tidskriftsartikel (refereegranskat)abstract
    • A method for generation of the control function for flexible manufacturing cells is presented in this paper. The control function is separated from the rest of the PLC program, and partitioned into a high-level part handling the operation sequence and a low-level part defining the execution process of the operations. The program structure enables high-level supervisor synthesis, which alleviates the state-space explosion problem. Information present in earlier steps of the development process is reused and processed, to automatically generate the automata needed for supervisor synthesis. An algorithm for generating automata, from the low-level safety requirements that restrict the high-level behavior, is presented. Algorithms are also presented for extracting the relations between the operations defining the work in the cell, from the synthesized supervisor. These relations give an easy-to-read representation of the control function that makes it interpretable by machine operators and maintenance personnel, an important feature to make the method applicable in an industrial setting. Hence, the control function generated by our method combines the benefits of a traditional supervisor, namely optimality and flexibility, with simplicity and clarity.
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  • Andersson, Kristin, 1976-, et al. (författare)
  • Generation of restart states for manufacturing cell controllers
  • 2011
  • Ingår i: Control Engineering Practice. - 0967-0661. ; 19:9, s. 1014-1022
  • Tidskriftsartikel (refereegranskat)abstract
    • A method for restart of manufacturing systems has recently been introduced. After correction of a fault. the system resumes normal production by returning to a certain restart state in the control function. and from there reexecuting parts of the work schedule. The current paper concerns automatic generation of the restart states, using discrete event systems theory. The generation process finds all possible restart states that guarantee that the execution restrictions are fulfilled during a restart, and that the production goals can be maintained. The number of restart states is minimized to reduce the number of necessary extensions to the control program. (C) 2011 Elsevier Ltd. All rights reserved.
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10.
  • Andersson, Kristin, 1976-, et al. (författare)
  • Generation of restart states for manufacturing systems with discarded workpieces
  • 2009
  • Ingår i: 2009 IEEE Conference on Automation Science and Engineering, CASE 2009, Bangalore, India. - 978-142444578-3 ; s. 191-196
  • Konferensbidrag (refereegranskat)abstract
    • In earlier work we presented a method for restart of manufacturing systems. After correction of an error, the system resumes normal production by returning to a certain restart state in the control function, and from there reexecutes parts of the work schedule. In the present paper the method is extended to handle also systems where some, but not necessarily all, workpieces are discarded during the error correction preceding the restart. The restart process must then replace the discarded workpieces with new ones. The workpieces that remain in the cell may limit the possibilities of executing certain operations needed to process the new workpieces correctly, thus complicating the restart. Properties of the restart states that guarantee a correct restart are defined, typical situations that make the system impossible to restart are presented, and some suggestions are given for modifications that make the system restartable.
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