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This paper considers the global robust cooperative output regulation problem of a class of nonlinear multi-agent systems with an unknown exosystem and unknown control directions. The arbitrarily large unknown parameters in the exosystem and local control coefficients pose the main challenges. To design an effective adaptive distributed controller for the proposed problem, the Nussbaum gain technique...
This paper considers the global robust output regulation problem of nonlinear output feedback systems in the case that both exosystem and high-frequency gain sign are unknown. The unavailability of these information poses challenges in the control law design. To solve the output regulation problem, a feedback controller is proposed by integrating the internal model principle, certainty equivalence...
In this paper, we study the asymptotic tracking and disturbance rejection problem for a class of uncertain nonlinear lower triangular systems subject to an uncertain exosystem. The same problem was studied before for the same class of systems with the objective of asymptotic tracking only. By utilizing a newly developed robust adaptive controller design approach, we are able to simultaneously handle...
In this paper, we deal with the output feedback disturbance rejection problem of the Duffingpsilas system with all the parameters unknown. By treating the unknown sinusoidal external disturbance as a signal produced by an unknown exosystem, we can first formulate the problem as a global robust output regulation problem subject to an unknown exosystem. Then we apply the adaptive output regulation technique...
<para> This paper studies the output feedback disturbance rejection problem of the uncertain Duffing's system subject to a sinusoidal external disturbance with unknown frequency and amplitude. We first formulate the problem as a global robust output regulation problem subject to an uncertain exosystem which models the sinusoidal disturbance. Then, we apply the adaptive output regulation technique...
The global robust output regulation problem for nonlinear systems in output feedback form has been solved under a key assumption that the control direction is known. This paper shows that this assumption can be removed by incorporating the Nussbaum gain technique into the existing framework for handling the robust output regulation problem
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