Optimal Gust Load Alleviation for a Flexible Aircraft

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Optimal Gust Load Alleviation for a Flexible
Aircraft

• Presented byNabil Aouf

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Optimal Gust Load Alleviation for a Flexible
Aircraft
I-Introduction
Gust load alleviation (GLA) systems

Longitudinal dynamics of the flexible B-52 bomber
Optimal control techniques are designed
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Optimal Gust Load Alleviation for a Flexible
Aircraft
II-GUST (TURBULENCE) MODEL
Von karman and Dryden models
Generation of Dryden model
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Optimal Gust Load Alleviation for a Flexible
Aircraft
(1)
An alternative use of the Dryden model

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Optimal Gust Load Alleviation for a Flexible
Aircraft
III-FLEXIBLE AIRCRAFT MODEL
. Short period approximation of the rigid body
mode. . Five flexible modes.
. State space representation
(2)
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Optimal Gust Load Alleviation for a Flexible
Aircraft
Coupling structure
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Optimal Gust Load Alleviation for a Flexible
Aircraft
Problem setup
IV-
Fig2 Problem setup
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Optimal Gust Load Alleviation for a Flexible
Aircraft


Fig3 standard control problem setup
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Optimal Gust Load Alleviation for a Flexible
Aircraft
V-
in
is embedded in the generalized plant
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Optimal Gust Load Alleviation for a Flexible
Aircraft
VI-
a-
b-
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Optimal Gust Load Alleviation for a Flexible
Aircraft

(3)
,
and
(4)
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Optimal Gust Load Alleviation for a Flexible
Aircraft
Fig4 Norms of closed-loop transfer matrices
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Optimal Gust Load Alleviation for a Flexible
Aircraft
VII-Time simulation
Fig5 Gust signals and Open loop response.
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Optimal Gust Load Alleviation for a Flexible
Aircraft
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Optimal Gust Load Alleviation for a Flexible
Aircraft
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Optimal Gust Load Alleviation for a Flexible
Aircraft
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Optimal Gust Load Alleviation for a Flexible
Aircraft
VIII-Conclusion
. Gust signals representation and motivation of
control. . Comparison of different modern
type of control. . Future research.