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Linear stable unity-feedback system: necessary and sufficient conditions for stability under nonlinear plant perturbations

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2 Author(s)
Desoer, C.A. ; Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA ; Kabuli, M.G.

The authors consider a linear (not necessarily time-invariant) stable unity-feedback system, where the plant and the compensator have normalized right-coprime factorizations. They study two cases of nonlinear plant perturbations (additive and feedback), with four subcases resulting from: (1) allowing exogenous input to δP or not; (2) allowing the observation of the output of δP or not. The plant perturbation δP is not required to be stable. Using the factorization approach, the authors obtain necessary and sufficient conditions for all cases in terms of two pairs of nonlinear pseudostate maps. Simple physical considerations explain the form of these necessary and sufficient conditions. Finally, the authors obtain the characterization of all perturbations δP for which the perturbed system remain stable

Published in:

Automatic Control, IEEE Transactions on  (Volume:34 ,  Issue: 2 )

Date of Publication:

Feb 1989

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