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Global stability of nonlinear feedback systemswith positive descriptor linear parts

Kaczorek T.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2019

Vol. 67, nr 1

45--51

The global (absolute) stability of nonlinear systems with negative feedbacks and positive descriptor linear parts is addressed. Transfer matrices of positive descriptor linear systems are analyzed. The characteristics u = f (e) of the nonlinear parts satisfy the condition k1e ≤ f (e) ≤ k2e for some positive k1, k2. It is shown that the nonlinear feedback systems are globally asymptotically stable if the Nyquist plots of the positive descriptor linear parts are located in the right-hand side of the circles (– 1/k1, – 1/k2).