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Robust control of nonlinear systems with input unmodeled dynamics

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3 Author(s)
Krstic, M. ; Dept. of Mech. Eng., Maryland Univ., College Park, MD, USA ; Sun, Jing ; Kokotovic, P.V.

In the rich repertoire of design methodologies for uncertain nonlinear systems, the problem of unmodeled dynamics has thus far received little attention. The authors initiate the investigation of nonlinear systems with input unmodeled dynamics. First the authors show that even in their simplest forms, they can result in dramatic shrinking of the region of attraction and in finite escape time. In this paper the authors introduce a dynamic nonlinear damping design which guarantees global boundedness in the presence of input unmodeled dynamics. With this design the authors achieve global asymptotic stability for strict-feedback systems and output-feedback systems

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Automatic Control, IEEE Transactions on  (Volume:41 ,  Issue: 6 )