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Parameter estimation in equivalent circuit analysis of dielectric cure monitoring signals using genetic algorithms.

By Michalis C. Kazilas, Alexandros A. Skordos and Ivana K. Partridge

Abstract

This communication concerns the treatment of dielectric data obtained from experiments following the chemical hardening process (cure) in thermosetting resins. The aim is to follow, in real time, the evolution of the individual parameters of an equivalent electrical circuit that expresses the electrical behavior of a curing thermoset. The article presents a methodology for the sequential inversion of impedance spectra obtained in cure monitoring experiments. A new parameter estimation technique based on genetic algorithms is developed and tested using different objective functions. The influence of the objective functions on the modelling performance is investigated. The new technique models successfully spectra contaminated with high noise levels. The introduction of regularization in the optimization function rationalizes the effects of outliers usually detected in cure monitoring dielectric spectra. The technique was successfully applied to the analysis of a series of spectra obtained during the cure of an epoxy thermosetting resin

Topics: Cure monitoring, Equivalent circuit modeling, Impedance, Genetic algorithms, Regularization
Publisher: Taylor & Francis
Year: 2005
DOI identifier: 10.1080/10682760412331313423
OAI identifier: oai:dspace.lib.cranfield.ac.uk:1826/1876
Provided by: Cranfield CERES
Journal:

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Citations

  1. (2002). A hybrid genetic algorithm for the fitting of models to electrochemical impedance data, doi
  2. (1997). Accurate fitting of immittance spectroscopy frequency-response data using the stretched exponential model, doi
  3. (1963). An algorithm for least squares estimation of nonlinear parameters, doi
  4. (1997). An improved analysis of admittance data for high resistivity materials by a nonlinear regularization method, doi
  5. (1998). An introduction to genetic algorithms, doi
  6. (1999). Analysis of admittance data: Comparison of a parametric and a nonparametric method, doi
  7. (1977). Analysis of impedance and admittance data for solids and liquids, doi
  8. Anomalous trends in conductivity during epoxy – amine reactions, doi
  9. (1996). Changes in molecular dynamics during bulk polymerization of an epoxide-amine system as studied by dielectric relaxation spectroscopy, doi
  10. (1992). Comparison and application of two methods for the least squares analysis of immittance data, doi
  11. (1929). Die dispersion und absorption von Röntgengebeit,
  12. (1986). Dielectric analysis of thermoset cure. doi
  13. (1996). Dielectric monitoring of epoxy Cure, doi
  14. (1977). Dielectric Spectroscopy of Polymers, doi
  15. (2002). Dipolar relaxations on an epoxy – amine system, doi
  16. (1995). Exact and approximate nonlinear least – squares inversion of dielectric relaxation spectra, doi
  17. (1998). Glass fibre epoxy composite cure monitoring using parallel plate dielectric analysis in comparison with thermal and mechanical testing techniques, doi
  18. Impedance cure and flow monitoring in the processing of advanced composites,
  19. (1995). Impedance spectroscopy of reacting polymers, doi
  20. (1996). Impedance spectroscopy of reactive polymers. 3. Correlations between dielectric, spectroscopic and rheological properties during cure of a trifunctional epoxy resin, doi
  21. (1996). Impedance spectroscopy of reactive polymers. 4. An improved experimental procedure for measurement of effective resistivity, doi
  22. (1998). Impedance spectroscopy of reactive polymers. 5. Impedance as a measure of chemical and physical changes in glass formers, doi
  23. (1995). Impedance spectroscopy of reactive polymers. Correlations with chemorheology during network formation, doi
  24. (1987). Impedance Spectroscopy. Emphasizing solid materials and systems, doi
  25. (1994). Modeling the dielectric behavior of epoxy resin blends during curing, doi
  26. (2000). On relaxation-spectrum estimation for decades of data: accuracy and sampling-localization considerations, doi
  27. (1926). On the theory of dispersion of doi
  28. (2001). On the use of WLF equation to study curing by dielectric spectroscopy, doi
  29. (1998). The use of genetic algorithms in the non-linear regression of immitance data, doi
  30. (2000). Tikhonov regularization and total least squares, doi
  31. (1994). Use of complex impedance to monitor the progress of reactions in epoxy/amine model systems, doi
  32. (1999). Variance of errors and elimination of outliers in the least squares analysis of impedance spectra, doi
  33. (2003). Vitrification and dielectric relaxation during the isothermal curing of an epoxy-amine resin, doi

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