ResumoNa vasta teoria de controle é relevante a análise da estabilidade de um sistema em torno de seus pontos de equilíbrio. Para tanto utilizam-se diversos critérios para estabelecer se o sistema é estável ou não.Neste presente trabalho as definições de estabilidade que serão utilizadas são as de Lyapunov. Para ilustrarmos esta análise,nosso foco neste trabalho é o estudo de estabilidade de sistemas positivos.
A method to bound the maximum energy perturbation for which regional stability of transitional fluid flow models can be guaranteed is introduced. The proposed method exploits the fact that the fluid model's nonlinearities are both lossless and locally bounded and uses the axes lengths of the ellipsoids for the trajectory set containment as variables in the stability conditions. Compared to existing approaches, the proposed method leads to an average increase in the maximum allowable energy perturbation of ≈ 29% for the Waleffe-Kim-Hamilton (WKH) shear flow model and of ≈ 38% for the 9-state reduced model of Couette flow.
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