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C. Westermayer, A. Schirrer, M. Hemedi, M. Kozek, A. Wildschek:
"Robust H-inf flight and load control of a flexible aircraft using a 2DOF multi-objective design";
Talk: 2009 CACS International Automatic Control Conference, Taipei, Taiwan; 2009-11-27 - 2009-11-29; in: "2009 CACS International Automatic Control Conference", (2009), ISBN: 978-986-84845-1-1; Paper ID 00081, 7 pages.

In this paper a robust integrated flight mechanics
and aeroelastics H∞ feedback controller using μ-synthesis for
the longitudinal motion of a large flexible aircraft is presented.
A multitude of design objectives is considered in control design,
with emphasis laid on fulfilling predefined rigid body responses
and manoeuvre demands and achieving gust load alleviation.
A trade-off between these conflicting design goals is obtained
using a two degree of freedom concept. Moreover, an increase
in passenger comfort is achieved by damping of the most
significant aeroelastic modes. For these goals symmetrically
actuated inner ailerons and direct lift control flaps are utilized.
The encountered strong changes of system behavior due to
the considered variations in fuel mass and center of gravity
position is accounted for by an appropriate choice of the
uncertainty model. A possible selection of suitable performance
outputs and their corresponding weighting functions are proposed.
It is shown that the chosen control design structure
allows for a balanced tuning of all design goals of interest.
The obtained controller is numerically validated on several
models, yielding promising performance results especially for
rigid body response and manoeuvre and gust load alleviation.

robust control, two degree of freedom control, flight control, load alleviation

Project Head Martin Kozek:
Aktive Regelung für ein flexibles 2020 Flugzeug