Flight control law design for a civil aircraft using robust
dynamic inversion.
Ir. Samir Bennani (Delft University of Technology)
A Robust Dynamic Inversion (RDI) flight control law is designed for a
large civil aircraft. Classical Dynamic Inversion (CDI) consists of a
nonlinear part that linearises the nominal system dynamics, and a
linear part, basically PID control, that imposes the desired
closed-loop dynamics. However, CDI controllers have very poor
robustness properties since they rely on exact availability of the
system dynamics. It is well known that within the Structured Singular
value (SSV), or mu framework, one can deal explicitly with
systems subject to uncertainties. This holds for both analysis and
synthesis. It is shown that mu-synthesis in combination with
dynamic inversion provides robust control solutions that are also
gain-scheduled. We first design a CDI controller. The exact robustness
deterioration is quantified by a parameter sensitivity study using
mu-analysis and nonlinear simulations. Next, an RDI
controller is designed. The achieved robustness improvments are
demonstrated using mu-analysis and nonlinear simulations.
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