Abstract
This work aims at the preparation of an experiment for the thermal modeling of an ARMCO iron sample (iron of the American Rolling Mill COmpany) for small temperature variations around different operating points. Fractional models have proven their efficacy for modeling thermal diffusion around the ambient temperature and for small variations. Due to their compactness, as compared to rational models and to finite element models, they are suitable for modeling such diffusive phenomena. However, for large temperature variations, thermal characteristics such as thermal conductivity and specific heat vary along with the temperature. In this context, the thermal diffusion obeys a nonlinear partial differential equation and cannot be modeled by a single linear model. In this paper, thermal diffusion of the iron sample is modeled around different operating points for temperatures ranging from 400 to 1070 K, which is above the Curie point (In physics and materials science, the Curie temperature (T C), or Curie point, is the temperature at which a ferromagnetic or a ferrimagnetic material becomes paramagnetic.) showing that for a large range of temperature variations, a nonlinear model is required. Identification and validation data are generated by finite element methods using COMSOL Software.
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A preliminary version of this paper was presented at the 4th IFAC Workshop on Fractional Differentiation and its Applications, Badajoz, Spain, 2010 [17]. Here is a revisited and enhanced version of this preliminary paper.
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Maachou, A., Malti, R., Melchior, P. et al. Thermal system identification using fractional models for high temperature levels around different operating points. Nonlinear Dyn 70, 941–950 (2012). https://doi.org/10.1007/s11071-012-0507-y
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DOI: https://doi.org/10.1007/s11071-012-0507-y