Tuning of large-scale linguistic equation (LE) models with genetic algorithms

  • Authors:
  • Esko K. Juuso

  • Affiliations:
  • Control Engineering Laboratory, Department of Process and Environmental Engineering, University of Oulu, Finland

  • Venue:
  • ICANNGA'09 Proceedings of the 9th international conference on Adaptive and natural computing algorithms
  • Year:
  • 2009

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Abstract

Evolutionary computing is widely used to tune intelligent systems which incorporate expert knowledge with data. The linguistic equation (LE) approach is an efficient technique for developing truly adaptive, yet understandable, systems for highly complex applications. Process insight is maintained, while data-driven tuning relates the measurements to the operating areas. Genetic algorithms are well suited for LE models based on nonlinear scaling and linear interactions. New parameter definitions have been developed for the scaling functions to handle efficiently the parameter constraints of the monotonously increasing second order polynomials. While identification approaches are used to define the model structures of the dynamic models. Cascade models, effective delays and working point models are also represented with LE models, i.e. the whole system is configured with a set of parameters. Results show that the efficiency of the systems improves considerably after the implementation of simultaneous tuning of all parameters.