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7: Magnitude (upper) and (lower) of closed-loop system at the 1st D-K iteration for 4-dimensional parameter uncertainty.  

7: Magnitude (upper) and (lower) of closed-loop system at the 1st D-K iteration for 4-dimensional parameter uncertainty.  

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Figure 3.3: Frequency response of wind model.  
Figure 3.2: Frequency response of the actuator dynamics.  
Figure 4.3: Frequency response of the nominal aircraft longitudinal...
Figure 5.7: Magnitude (upper) and (lower) of closed-loop system at the...
+2 Figure 6.2: Robust stability: real-of the longitudinal closed-loop...
Civil Aircraft Autopilot Design Using Robust Control
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  • Apr 1999
This report presents the results of the project executed at the National Aerospace Laboratory NLR within the scope of the second year design project of the post-MSc mathematical design engineering programme "Wiskundige Beheers- en Beleidsmodellen " (WBBM) of the Delft University of Technology (TUD).
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... The authors of [7,8] identify the following necessary and sufficient conditions of stability of a control system to uncertainties: the presence of robustness properties in the system (insensitivity to changes in system parameters or structure); reconfigurability (purposeful change of some system parameters in order to compensate for uncontrolled changes) and tunability (changes in system structure). However, there are no accurate aerodynamic data. ...
... where e δ is deflection; q is the effect of variation of the object deflection angle on the lifting force and drag; C L (α), C D (α) are the values of drag and lift coefficients in the minimum angle of attack of the object. Fig. 9 shows the range of aerodynamic coefficients depending on deflection of one or another aerodynamic surface [7,8]. ...
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