10.17863/CAM.5917
Maciejowski, JM
Hartley, EN
Siaulys, K
A longitudinal flight control law to accommodate sensor loss in the RECONFIGURE benchmark
Elsevier BV
2016
Optimal control
Robust control
Aircraft control
Aerospace
Fault-tolerant control
Flight envelope protection
Apollo - University of Cambridge Repository
University of Cambridge
013meh722
2016-10-14
2016-10-14
2016
eng
Article
https://www.repository.cam.ac.uk/handle/1810/260763
10.1016/j.arcontrol.2016.07.001
The feedback gains in state-of-the-art flight control laws for commercial aircraft are scheduled as a function of values such as airspeed, mass, and centre of gravity (CoG). If measurements or estimates of these are lost due to multiple simultaneous sensor failures, the pilot must revert to an alternative control law, or, in the ultimate case, directly command control surface positions. This work develops a robust backup load-factor tracking control law, that does not depend on these parameters, based on application of theory from robust MPC and $H_2$ optimal control. Firstly, the methods are applied with loss only of airdata, and subsequently also with loss of mass and CoG estimates. Local linear analysis indicates satisfactory performance over a wide range of operating points. To keep the aircraft within an acceptable operating region, an outer protection loop is implemented using an override approach, based on ground speed, a model of the trim angle of attack and variation of load factor with respect to angle of attack, and $\textit{a priori}$ bounds on the wind speed. Finally, the resulting control laws are demonstrated on the nonlinear RECONFIGURE benchmark, which is derived from an Airbus high fidelity, industrially-validated simulator.
European Commission
314544