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2 Journal of Theoretical and Applied Mechanics

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Robust adaptive vibration control for a general class of structures in the presence of time-varying uncertainties and disturbances

100%

Koofigar H. R. , Amelian S.

tom Vol. 51 nr 3

533--541

The problem of active vibration suppression in a wide class of smart structures is addressed. The dynamical model of a structure may be perturbed by uncertain time-varying parameters and external disturbances. A novel adaptive-based control algorithm is presented here to satisfy robustness properties with respect to model uncertainties and environmental disturbances. Reflecting practical situations, the upper bound of perturbations is not required for controller design. The analytical stability of a closed-loop system is presented based on the Lyapunov stability theorem. Furthermore, numerical analysis is also provided to show the effectiveness of the proposed method.

Adaptive fuzzy control for a class of constrained nonlinear systems with application to a surface vessel

80%

Jamalzade M. S. , Koofigar H. R. , Ataei M.

tom Vol. 54 nr 3

987--1000

In this paper, adaptive control for a class of uncertain nonlinear systems with input constraints is addressed. The main goal is to achieve a self-regulator PID controller whose coefficients are adjusted by using some adaptive fuzzy rules. The constraints on the control signal are taken into account as a saturation operator. The stability of the closed-loop system is analytically proved by using the Lyapunov stability theorem. The proposed method is then applied to a surface vessel with uncertain dynamic equations. The simulation results show the effectiveness of the proposed control strategy.