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A Practical Approach to Robustness Analysis with Aeronautical Applications (Hardcover, 1999 ed.)
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A Practical Approach to Robustness Analysis with Aeronautical Applications (Hardcover, 1999 ed.)
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1. MOTIVATION In many physical situations, a plant model is often
provided with a qualitative or quantitative measure of associated
model uncertainties. On the one hand, the validity of the model is
guaranteed only inside a frequency band, so that nearly nothing can
be said about the behavior of the real plant at high frequencies.
On the other hand, if the model is derived on the basis of physical
equations, it can be parameterized as a function of a few physical
parameters, which are usually not perfectly known in practice. This
is e.g. the case in aeronautical systems: as an example, the ae-
dynamic model of an airplane is derived from the flight mechanics
eq- tions. When synthesizing the aircraft control law, it is then
necessary to take into account uncertainties in the values of the
stability derivatives, which correspond to the physical
coefficients of the aerodynamic model. Moreover, this airplane
model does not perfectly represent the be- vior of the real
aircraft. As a simple example, the flight control system or the
autopilot are usually synthesized just using the aerodynamic model,
thus without accounting for the flexible mechanicalstructure: the
c- responding dynamics are indeed considered as high frequency
neglected 1 dynamics, with respect to the dynamics of the rigid
model .
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