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Adaptive nonlinear design with controller-identifier separation and swapping

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2 Author(s)
Krstic, M. ; Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA ; Kokotovic, P.V.

We present a new adaptive nonlinear control design which achieves a complete controller-identifier separation. This modularity is made possible by a strong input-to-state stability property of the new controller with respect to the parameter estimation error and its derivative as inputs. These inputs are independently guaranteed to be bounded by the identifier. The new design is more flexible than the Lyapunov-based design because the identifier can employ any standard update law gradient and least-squares, normalized and unnormalized. A key ingredient in the identifier design and convergence analysis is a nonlinear extension of the well-known linear swapping lemma

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Automatic Control, IEEE Transactions on  (Volume:40 ,  Issue: 3 )