Abstract
This is the second part of a two-part manuscript focused on the analysis of electronic circuits employing extended irreversible thermodynamics. In this contribution, internal entropy production is used as a Lyapunov function for a thermodynamically consistent model of Chua’s circuit to address stability properties of an isolated, isothermal system containing it. In order to achieve this, simpler electronic circuits are first analyzed with an increasing complexity in construction. Here an RC-nonlinear resistor circuit and an RLC-nonlinear resistor circuit are considered as a preamble of the study of Chua’s circuit. In this manner, the entropy production approach allows conservative and dissipative phenomena and their interactions to be identified and contrasted with those of simpler study cases. Identification of recurrent terms in the dynamics of the entropy production function leads to the description of elemental interactions among electronic components. Analytical results are supported with numerical simulations at specific conditions. Chaos and other complex behaviors, like limit cycles, are analyzed and described with entropic and energetic perspectives. Apart from the determination of their stability, entropic descriptions for nodes, saddles and foci observed in the study cases and their vicinities are presented. It is observed through an extended Gibbs free energy analysis that the dissipation in limit cycles equals the build-up of energy. On the contrary, the behavior of changes of the state variables in a strange attractor is energetically asynchronous and unbalanced.
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Acknowledgements
Sergio Javier Munguía-Medina thanks Consejo Nacional de Ciencia y Tecnología (CONACyT) for the financial support under Grant Agreement No. 706022.
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Sergio Javier Munguía-Medina involved in formal analysis, investigation, resources, software, visualization, writing—original draft. Juan Paulo García-Sandoval involved in conceptualization, formal analysis, methodology, project administration, resources, supervision, validation, writing—review & editing. Alejandro González-Álvarez involved in resources, supervision, writing—review & editing.
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Munguía-Medina, S.J., García-Sandoval, J.P. & González-Álvarez, A. Stability analysis of a class of electronic circuits based on thermodynamic principles part II: analysis of chaos in Chua’s circuit. Nonlinear Dyn 105, 3637–3658 (2021). https://doi.org/10.1007/s11071-021-06753-0
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DOI: https://doi.org/10.1007/s11071-021-06753-0