Title :
Computation of LFT uncertainty bounds with repeated parametric uncertainties
Author :
Lim, K.B. ; Giesy, D.P.
Author_Institution :
NASA Langley Res. Center, Hampton, VA, USA
Abstract :
A methodology in which linear fractional transformation uncertainty bounds are directly constructed for use in robust control design and analysis is proposed. Existence conditions for model validating solutions with or without repeated scalar uncertainty are given. The approach is based on minimax formulation to deal with multiple non-repeated structured uncertainty components subject to fixed levels of repeated scalar uncertainties. Input directional dependence and variations with different experiments are addressed by maximizing uncertainty levels over multiple experimental data sets. Preliminary results show that reasonable uncertainty bounds on structured non-repeated uncertainties can be identified directly from measurement data by assuming reasonable levels of repeated scalar uncertainties
Keywords :
control system analysis; control system synthesis; identification; robust control; uncertain systems; existence conditions; input directional dependence; linear fractional transformation; model validating solutions; repeated parametric uncertainties; repeated scalar uncertainties; robust control analysis; robust control design; uncertainty bounds; Aerospace engineering; Discrete Fourier transforms; Equations; Frequency measurement; Minimax techniques; NASA; Noise measurement; Robust control; Signal processing; Uncertainty;
Conference_Titel :
American Control Conference, 1998. Proceedings of the 1998
Conference_Location :
Philadelphia, PA
Print_ISBN :
0-7803-4530-4
DOI :
10.1109/ACC.1998.703563