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Global Disturbance Rejection of Lower Triangular Systems With an Unknown Linear Exosystem

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3 Author(s)
Lu Liu ; Dept. of Mech., Mater. & Manuf., Univ. of Nottingham, Nottingham, UK ; Zhiyong Chen ; Jie Huang

In this technical note, we study the global disturbance rejection problem of nonlinear systems in lower triangular form with unknown exosystem via state feedback control. The problem is dealt with in two steps. In the first step, an augmented system composed of the given plant and an internal model is constructed. Owing to the presence of the unknown parameter in the exosystem, the augmented system contains both nonlinearly and linearly parameterized uncertainties. In the second step, the stabilization of the augmented system is solved by an approach integrating both robust and adaptive techniques. The solution of the stabilization problem of the augmented system in turn leads to the solution of the global disturbance rejection problem of the original system. Further, the convergence issue of an estimated unknown parameter vector is also discussed.

Published in:

Automatic Control, IEEE Transactions on  (Volume:56 ,  Issue: 7 )

Date of Publication:

July 2011

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