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On real order passivity

Gallegos J. A., Duarte-Mermoud M. A.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2019

Vol. 67, nr 3

445--454

The aim of this paper is to show that a real order generalization of the dissipative concepts is a useful tool to determine the stability (in the Lyapunov and in the input-output sense) and to design control strategies not only for fractional order non-linear systems, but also for systems composed of integer and fractional order subsystems (mixed-order systems). In particular, the fractional control of integer order system (e.g. PI? control) can be formalized. The key point is that the gradations of dissipativeness, passivity and positive realness concepts are related among them. Passivating systems is used as a strategy to stabilize them, which is studied in the non-adaptive as well as in the adaptive case.

Hyperbolic equations in uniform spaces

Cholewa J. W., Dlotko T.

Bulletin of the Polish Academy of Sciences. Mathematics

2004

Vol. 52, nr 3

249-263

The paper is devoted to the Cauchy problem for a semilinear damped wave equation in the whole of R^n. Under suitable assumptions a bounded dissipative semigroup of global solutions is constructed in a locally uniform space H[...]^R^n) x L[...](R^n). Asymptotic compactness of this semigroup and the existence of a global attractor are then shown.