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Peak-Seeking Optimization of Spanwise Lift Distribution for Wings in Formation Flight
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Author and Affiliation:
Hanson, Curtis E.(NASA Dryden Flight Research Center, Edwards, CA, United States);
Ryan, Jack(NASA Dryden Flight Research Center, Edwards, CA, United States)
Abstract: A method is presented for the in-flight optimization of the lift distribution across the wing for minimum drag of an aircraft in formation flight. The usual elliptical distribution that is optimal for a given wing with a given span is no longer optimal for the trailing wing in a formation due to the asymmetric nature of the encountered flow field. Control surfaces along the trailing edge of the wing can be configured to obtain a non-elliptical profile that is more optimal in terms of minimum combined induced and profile drag. Due to the difficult-to-predict nature of formation flight aerodynamics, a Newton-Raphson peak-seeking controller is used to identify in real time the best aileron and flap deployment scheme for minimum total drag. Simulation results show that the peak-seeking controller correctly identifies an optimal trim configuration that provides additional drag savings above those achieved with conventional anti-symmetric aileron trim.
Publication Date: Jul 22, 2012
Document ID:
20130001676
(Acquired Jan 15, 2013)
Subject Category: AIRCRAFT STABILITY AND CONTROL
Report/Patent Number: DFRC-E-DAA-TN5266
Document Type: Conference Paper
Publication Information: (SEE 20120016853)
Meeting Information: Guidance Navigation and Control Conference; 22 Jul. 2012; Minneapolis, MN; United States
Meeting Sponsor: American Inst. of Aeronautics and Astronautics; Reston, VA, United States
Contract/Grant/Task Num: WBS 561581.02.08.02.46.03.01
Financial Sponsor: NASA Dryden Flight Research Center; Edwards, CA, United States
Organization Source: NASA Dryden Flight Research Center; Edwards, CA, United States
Description: 12p; In English; Original contains black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: AERODYNAMIC DRAG; AERODYNAMICS; CONTROLLERS; FLAPPING; FORCE DISTRIBUTION; INDUCED DRAG; LIFT; MINIMUM DRAG; SIMULATION; TRAILING EDGES; WINGS
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