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A. Schirrer, C. Westermayer, M. Hemedi, M. Kozek:
"Robust feedback lateral control using a parameterized LFR model and DGK-iteration";
Talk: 4th European Conference for Aerospace Sciences (EUCASS), St. Petersburg (invited); 2011-07-04 - 2011-07-08; in: "Proceedings of the 4th European Conference for Aerospace Sciences (EUCASS)", (2011), Paper ID 652, 11 pages.

This paper shows results, performance and limitations of robust lateral control law designs for a large,
flexible blended wing body passenger aircraft. The aircraft dynamics is pre-shaped by a robust inner loop
control law aiming at stabilization, basic response shaping, and flexible mode damping. The presented
designs aim to further improve vibration damping of themain flexiblemodes despite significant parameterdependent
plant variations. The resulting high-dimensional robust control design problem is addressed
via the DGK-iteration method applied to a parameterized reduced-order integrated model of both rigidbody
and flexible dynamics in Linear Fractional Representation (LFR).While a high-accuracy LFR yields
a prohibitive problem size for today´s design tools, simplified uncertainty parameterizations result in a
successful control design. Different modeling approaches are compared and discussed with respect to the
trade-off between achievable control performance, robustness, and problem size/controller order.

robust control, mu synthesis, DGK iteration, LFT, LFR, plant parametrization