Case Study: Application of NNARX Networks in the Identification of a Small-Scale Level System

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Authors

  • Accacio Ferreira dos Santos Neto
  • Murillo Ferreira dos Santos
  • Augusto Cerqueira Santiago
  • Vinícius Ferreira Vidal
  • Paolo Mercorelli

This work proposes the identification study of a small scale nonlinear system through Neural Network AutoRegressive with eXternal input (NNARX). The use of the NNARX network requires a proper methodology for its configuration and a good training set. This work proposes the main parameter definition of the network through the analysis of non-intrusive performance indexes with the support of a database based on the system response, considering a Pseudo-Random Binary Sequence (PRBS) excitation. The methodology will be applied in two specific open-loop identification situations: Numerical simulation of a fourth order polynomial system (Case 01), and an experimental system that controls the water tank level with nonlinear characteristics (Case 02). The results of the identified models by the developed NNARX network were able to represent the system dynamics with high fidelity, presenting an average identification error of less than 0.14% (Case 01) and 0.34% (Case 02). It was also observed the learning and generalization evidence that could represent the process intrinsic nonlinearities satisfactorily. Besides, it will be possible to find the potentiality and usefulness of the NNARX network in non-linear system identification. Besides, it will be possible to find the potentiality and usefulness of the NNARX network in nonlinear system identification.

Original languageEnglish
Title of host publication2019 3rd European Conference on Electrical Engineering and Computer Science, EECS 2019 : Athens, Greece 28-30 December 2019, Proceedings
Number of pages4
Place of PublicationPiscataway
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
Publication date2019
Pages15-18
Article number9257574
ISBN (print)978-1-7281-6110-5
ISBN (electronic)978-1-7281-6109-9
DOIs
Publication statusPublished - 2019
Event3rd European Conference on Electrical Engineering and Computer Science - EECS 2019 - Athens, Greece
Duration: 28.12.201930.12.2019

Bibliographical note

The conference was held in December 2019 and the paper appeared in IEEEXplore and in Scopus in December 2020.

    Research areas

  • Level System, NNARX networks, System Identification
  • Engineering

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