Equações Diferenciais não Lineares com Três Retardos: Estudo Detalhado das Soluções

Figueiredo, Júlio César Bastos de

doi:10.11606/T.43.2000.tde-28112013-102436

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Thèse de Doctorat

DOI

https://doi.org/10.11606/T.43.2000.tde-28112013-102436

Document

Thèse de Doctorat

Auteur

Figueiredo, Júlio César Bastos de (Catálogo USP)

Nom complet

Júlio César Bastos de Figueiredo

Unité de l'USP

Instituto de Física

Domain de Connaissance

Physique Nucléaire

Date de Soutenance

2000-05-25

Editeur

São Paulo, 2000

Directeur

Malta, Coraci Pereira (Catálogo USP)

Jury

Malta, Coraci Pereira (Président)
Caldas, Ibere Luiz
Furuie, Sergio Shiguemi
Koiller, Jair
Ranvaud, Ronald Dennis Paul Kenneth Clive

Titre en portugais

Equações Diferenciais não Lineares com Três Retardos: Estudo Detalhado das Soluções

Mots-clés en portugais

Equações diferenciais não lineares
Física teórica

Resumé en portugais

In this thesis we study the behavior of a simple control system based on a delay differential equation with multiple loops of negative feedback. Numerical solutions of the delay differential equation with N delays d/dt x(t) = -x(t) + 1/N POT.N IND.i=1 / POT.n IND.i + x (t- IND.i) POT.n have been investigated as function of its parameters: n, i and i. A simple numerical method for determine the stability regions of the equilibrium points in the parameter space (i, n) is presented. The existence of a doubling period route to chaos in the equation, for N = 3, is characterized by the construction of bifurcation diagram with parameter n. A numerical method that uses the analysis of Poincaré sections of the reconstructed attractor to find aperiodic solutions in the parameter space of the equation is also presented. We apply this method for N = 2 and get evidences for the existence of chaotic solutions as result of a period doubling route to chaos (chaotic solutions for N = 2 in that equation had never been observed). Finally, we study the solutions of a piecewise constant equation that corresponds to the limit case n .

Titre en anglais

Nonlinear differential equations with three delays: detailed study of the solutions.

Mots-clés en anglais

Nonlinear differential equations
Theoretical physics

Resumé en anglais

In this thesis we study the behavior of a simple control system based on a delay differential equation with multiple loops of negative feedback. Numerical solutions of the delay differential equation with N delays d/dt x(t) = -x(t) + 1/N POT.N IND.i=1 / POT.n IND.i + x (t- IND.i) POT.n have been investigated as function of its parameters: n, i and i. A simple numerical method for determine the stability regions of the equilibrium points in the parameter space (i, n) is presented. The existence of a doubling period route to chaos in the equation, for N = 3, is characterized by the construction of bifurcation diagram with parameter n. A numerical method that uses the analysis of Poincaré sections of the reconstructed attractor to find aperiodic solutions in the parameter space of the equation is also presented. We apply this method for N = 2 and get evidences for the existence of chaotic solutions as result of a period doubling route to chaos (chaotic solutions for N = 2 in that equation had never been observed). Finally, we study the solutions of a piecewise constant equation that corresponds to the limit case n .

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Date de Publication

2013-12-18

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