Molong Duan, John H. Hansen, Ilya V. Kolmanovsky, Carlos E. S. Cesnik

DOI Number: N/A

Conference number: IFASD-2019-109

The use of high aspect-ratio wings and light structures in aircraft design increases the lift, reduces the drag, and minimizes the weight of the aircraft; however, it inevitably increases aircraft flexibility and requires maneuver load alleviation (MLA) to maintain aircraft structural integrity in aggressive maneuvers. In this paper, a control allocation scheme is proposed that redistributes the control actions from an existing aircraft controller, in a way that the load (and other flexible states) at critical stations are constrained while the rigid body trajectory remains unaffected. The control allocation scheme exploits the preview of maneuver trajectory, the null space established through matrix fraction description of linear model, and a numerical solution of a quadratic programming problem with a basis function decomposition of null space variables. The proposed method is validated by simulations on a linearized model of a flexible X-HALE aircraft. The proposed MLA through control allocation approach is shown to avoid the violation of load bounds without changing the rigid body response of the aircraft.

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In Categories: Control of Very Flexible Aircraft, IFASD 2019
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