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New results on output-feedback variable structure model-reference adaptive control: design and stability analysis

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3 Author(s)
Liu Hsu ; Dept. of Electr. Eng., Federal Univ. of Rio de Janeiro, Brazil ; Lizarralde, F. ; De Araujo, A.D.

The variable structure model-reference adaptive control(VS-MRAC) redesign and stability analysis, presented previously by the authors (1993) for the case of plants with relative degree n*⩽2, is generalized to the case of arbitrary n*⩾1. This paper presents a complete stability analysis in the general case. The redesign is based on the explicit consideration of input disturbances which may include the disturbance originated by the uncertainty of the plant high-frequency gain. This leads to a considerably simpler and less restrictive stability analysis as well as to a systematic controller design for external disturbance rejection. The overall error system is globally exponentially stable with respect to a small residual set. Robustness to unmodeled dynamics is also discussed

Published in:

Automatic Control, IEEE Transactions on  (Volume:42 ,  Issue: 3 )