Basin Of Attraction
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Sistemas dinâmicos: bacias de atração e aplicações / Dynamical systems: basins of attraction and aplications
The present work proposes to present a description of the theory on the basins of attraction of hyperbolic equilibrium points of continuous dynamical systems, to develop a method for the numerical determination of these basins and to examine the results of applying the theory and method in models of population dynamics. The determination of the basins of att
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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2. Fish passage system in an irrigation dam (Pilcomayo River basin ): when engineering designs do not match ecohydraulic criteria
The Route 28 Dam has the potential to block fish movements from La Estrella marsh to the Pilcomayo River. In addition, the many fish that concentrate immediately downstream of the dam may suffer high mortality when they are stranded during low water periods. The goals of this study are to determine if fish are able to pass the spillway and to assess if the d
Neotrop. ichthyol.. Publicado em: 2012-10
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3. Construction of Lyapunov functions for the estimation of basins of attraction
Technical systems are often modeled through systems of differential equations in which the parameters and initial conditions are subject to uncertainties. Usually, special solutions of the differential equations like equilibrium positions and periodic orbits are of importance and frequently the corresponding equations are only set up with the intent to descr
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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4. Stability analysis and stabilization of systems presenting nested saturations
This note addresses the problems of stability analysis and stabilization of systems presenting nested saturations. Depending on the open-loop stability assumption, the global stability analysis and stabilization problems are considered. In the (local) analysis problem, the objective is the determination of estimates of the basin of attraction of the system.
Publicado em: 2011
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5. Antiwindup design with guaranteed regions of stability : an LMI-based approach
This note addresses the design of antiwindup gains for obtaining larger regions of stability for linear systems with saturating inputs. Considering that a linear dynamic output feedback has been designed to stabilize the linear system (without saturation), a method is proposed for designing an antiwindup gain that maximizes an estimate of the basin of attrac
Publicado em: 2011
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6. Controle de caos e saltos entre atratores em um sistema com impactos / Control of caos and basin hopping in a system with impacts
For a mechanical system, described by the impact-pair model, we studied the control of chaos by a parametric perturbation and the basin-hopping phenomeno. For this nonintegrable system, we obtained numerically the evolution of its dynamical variables for a large set of initial conditions and control parameters. For this analysis, we used phase planes, Poinca
Publicado em: 2010
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7. Caracterização, estimativas e bifurcações da região de estabilidade de sistemas dinâmicos não lineares / Characterization, estimates and bifurcations of stability region of nonlinear dynamical systems
Estimar a região de estabilidade de um ponto de equilíbrio assintoticamente estável é importante em aplicações tais como sistemas de potência, economia e ecologia. A compreensão da estrutura qualitativa da fronteira da região de estabilidade é fundamental para estimar com eficiência a região de estabilidade. Caracterizações topológicas e dinâ
Publicado em: 2010
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8. Bacias crivadas em sistemas mecânicos e biológicos e estudo da variabilidade da frequência cardíaca / Riddled basins of attraction in mechanical and biological systems and heart rate variability study
Um estudo de bacias crivadas e um estudo de séries de batimentos cardíacos através de ferramentas não lineares são apresentados. Bacias crivadas ocorrem em sistemas não lineares onde a simetria do espaço de fase permite a existência de um subespaço invariante capaz de atrair e repelir órbitas. Como conseqüência para todo ponto pertencente a bacia
Publicado em: 2009
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9. Energia cinética e pontos de equilíbrio de sistemas hamiltonianos / Kinetic energy and equilibrium points of Hamiltonian systems
We study a non trivial influence of the kinetic energy on equilibrium points of Hamiltonian systems following the second part of Garcia &Tal article \"The influence of the kinetic energy in equilibrium of Hamiltonian systems\". In this article the authors show, for an explicit example of C (R4 ) Hamiltonians defined by Hi = Ti + for i {1, 2}, that the attrac
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/06/2008
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10. A discrete inhomogeneous model for the yeast cell cycle
We study the robustness and stability of the yeast cell regulatory network by using a general inhomogeneous discrete model. We find that inhomogeneity, on average, enhances the stability of the biggest attractor of the dynamics and that the large size of the basin of attraction is robust against changes in the parameters of inhomogeneity. We find that the mo
Brazilian Journal of Physics. Publicado em: 2008-09
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11. A simplified Fermi Accelerator Model under quadratic frictional force
Some dynamical properties for a simplified version of a one-dimensional Fermi Accelerator Model under the action of a small dissipation is studied. The dissipation is introduced via a damping force which is assumed to be proportional to the square particle's velocity. The dynamics of the model is described by using a two-dimensional, nonlinear area contracti
Brazilian Journal of Physics. Publicado em: 2008-03
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12. SoluÃÃes auto - similares e comportamento assintÃtico para as equaÃÃes de navier - Stokes
This master dissertation deals with the Navier-Stokes s equations on Rm, assuming that the fluid is incompressible and homogeneous. We analyzed the Cauchy s problem in Marcinkiewicz spaces (L p−weak), with the right index to allow the existence of selfsimilar solutions. We also study the asymptotic behavior of the solutions and show the existence of a
Publicado em: 2008