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Symbolic and numerical software tools for LFT-based low order uncertainty modeling

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2 Author(s)
Varga, A. ; Inst. of Robotics & Syst. Dynamics, German Aerosp. Center, Wessling, Germany ; Looye, G.

One of the main difficulties in applying modern control theories for designing robust controllers for linear uncertain plants is the lack of adequate models describing structured physical model uncertainties. We present a systematic approach for the generation of uncertainty models described by linear fractional transformations (LFTs) and report on recently developed symbolic and numerical software to assist the generation of low order LFT-based uncertainty models. The kernel of the symbolic software is a Maple library for generation and manipulation of LFT models. Additional numerical tools for order reduction of LFT models are based on MATLAB and FORTRAN implementations of numerically reliable algorithms. Three examples of uncertainty modeling of aircraft dynamics illustrate the capabilities of the new software to solve high order uncertainty modeling problems

Published in:

Computer Aided Control System Design, 1999. Proceedings of the 1999 IEEE International Symposium on

Date of Conference:

1999

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