1. Optimal Gust Load Alleviation for a Flexible Aircraft
Presented by:Nabil Aouf

2. 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

3. Optimal Gust Load Alleviation for a Flexible Aircraft
II-GUST (TURBULENCE) MODEL:
Von karman and Dryden models
Generation of Dryden model:

4. Optimal Gust Load Alleviation for a Flexible Aircraft
(1)
An alternative use of the Dryden model: :

5. 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)

6. Optimal Gust Load Alleviation for a Flexible Aircraft
* Coupling structure:

7. Optimal Gust Load Alleviation for a Flexible Aircraft
Problem setup:
IV-
Fig2: Problem setup

8. Optimal Gust Load Alleviation for a Flexible Aircraft: :
Fig3: standard control problem setup

9. Optimal Gust Load Alleviation for a Flexible Aircraftin
is embedded in the generalized plant

10. Optimal Gust Load Alleviation for a Flexible Aircraft

11. Optimal Gust Load Alleviation for a Flexible Aircraft*
(3) ,
and
(4)

12. Optimal Gust Load Alleviation for a Flexible Aircraft
Fig4: Norms of closed-loop
transfer matrices

13. Optimal Gust Load Alleviation for a Flexible Aircraft
VII-Time simulation:
Fig5: Gust signals and
Open loop response.

14. Optimal Gust Load Alleviation for a Flexible Aircraft
Fig6:
Control simulation

15. Optimal Gust Load Alleviation for a Flexible Aircraft
Control simulation
Fig7:

16. Optimal Gust Load Alleviation for a Flexible Aircraft
Control simulation
Fig8:

17. 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.