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Study of a direct lift control system based on the A380 aircraft
2008 (English)In: 46th AIAA Aerospace Sciences Meeting and Exhibit, 2008Conference paper (Refereed)
Abstract [en]

From a flight control point of view, the larger and heavier an aircraft, the more sluggish the natural response to raw control inputs. This downside may become critical for operations that require quick and accurate corrections of the aircraft's attitude and trajectory, such as final approach and landing. When it comes to longitudinal control, the initial opposing lift caused by the conventional control surfaces, i.e. the elevators, makes it even worse. The basic idea underlying the 'Direct Lift Control' (DLC) concept is to use different flight control surfaces to provide quicker and more precise modulations of lift, and thus to better control the attitude and flight path of the aircraft in the vertical plane. Considering a civil aircraft with a classical flight control architecture, the spoilers mounted on the upper-side of the wings appear to be well adapted to this purpose. Following a few successful implementations on different kinds of aircraft, this report presents the results of a study dedicated to the design of a DLC function for today's fly-by-wire Airbus aircraft. The main conclusion is that with an authority of about ±0:1g, DLC significantly improves the automatic landing performance, as well as provides enhanced piloting qualities. Overall, DLC is expected to enhance the ride comfort in turbulent atmosphere.

Place, publisher, year, edition, pages
, 46th AIAA Aerospace Sciences Meeting and Exhibit
Keyword [en]
A380 aircraft, Accurate correction, Airbus aircraft, Automatic landing, Basic idea, Civil aircrafts, Control inputs, Conventional control, Direct lift control, Final approach, Flight control, Flight control surface, Natural response, Ride comforts, System-based, Turbulent atmosphere, Vertical plane, Air traffic control, Aircraft control, Atmospheric turbulence, Control surfaces, Elevators, Flight control systems, Flight dynamics, Flight paths, Landing, Longitudinal control, Aircraft
National Category
Aerospace Engineering
URN: urn:nbn:se:kth:diva-153997ScopusID: 2-s2.0-78149464039ISBN: 9781563479373OAI: diva2:762113
46th AIAA Aerospace Sciences Meeting and Exhibit, 7 January 2008 through 10 January 2008, Reno, NV, United States

QC 20141110

Available from: 2014-11-10 Created: 2014-10-10 Last updated: 2014-11-10Bibliographically approved

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Merat, Romain
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