Suppression of falling leaf mode phenomenon for F/A - 18 via L1 adaptive feedback controller
F / A - 18 Hornet aircraft is prone to nonlinear phenomenon known as the fulling leaf mode, which when operating at deep stall is often combined with large side slip and yaw motion resuhs in significant rotation. The resuhant rotation triggers the aircraft to lose ahitude at a very fuster rate. T...
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| 格式: | Theses and Dissertations |
| 語言: | English |
| 出版: |
2017
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| 主題: | |
| 在線閱讀: | http://hdl.handle.net/10356/72702 |
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| 總結: | F / A - 18 Hornet aircraft is prone to nonlinear phenomenon known as the fulling leaf
mode, which when operating at deep stall is often combined with large side slip and
yaw motion resuhs in significant rotation. The resuhant rotation triggers the aircraft
to lose ahitude at a very fuster rate. The intention of this work is to design LI
adaptive controller for F / A - 18 aircraft intended to suppress the fulling leaf
phenomenon. The design developed will be using Lyapunov's based adaptive laws
to compensate for the uncertainties in design variable and comparing the associated
performance with the conventional controller.
The L 1 adaptive controller implementation to F / A -18 aircraft has proved
good resuhs in eliminating the uncertainties when implemented and also proper
selection of fiher in adaptive control design can handle uncertainties and
disturbance well to track reference signal. Compared to the MRAC formulation
introduction of fiher in LI is more robust to uncertain parameters. The performance
study on implementing LI adaptive controller to the VA V is also found in this
report.
Resuhs indicate that introduction of fiher in LI adaptive controller provides
good improvement in surpassing uncertainties with minimized effect on cost
criteria. The resuhs of simulations show how efficient the controller is designed to
separate adaption from robustness and the efficient way of handling performance
bounds. |
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