Performance optimization of flexible wings using multiple control surfaces
2009 (English)In: International forum on aeroelasticity and structural dynamics, 2009, 1-15 p.Conference paper (Other academic)
In this study, the performance of a flexible wing with multiple control surfaces is optimized for different flight conditions. A wind tunnel model with 16 independent control surfaces is used as the test case. The problem is posed as a nonlinear optimization problem with the measured drag as the objective. The variables are the control surface deflections and the angle of attack. Using direct measurements and hardware in the optimization loop causes several difficulties such as problems with repeatability and drift in the measured signal. Constraints include maintaining the lift as well as bounds on the control surface deflections and the angle of attack. No computational estimation of the drag is performed. Instead, experimental measurements of the drag are used to perform the optimization during the wind tunnel test using a generating set search method. Including the angle of attack as a variable makes the lift constraint slightly nonlinear. An extension to the generating set search method is discussed and implemented to treat this nonlinearity. The algorithm makes the wing adapt to the current flight condition to improve performance. The experimental evaluation of the method shows that the drag is significantly reduced within a wide range of flight conditions.
Place, publisher, year, edition, pages
2009. 1-15 p.
Performance optimization, Nonlinear constraints, Generating set search, derivative-free optimization, drag minimization, wind tunnel testing
IdentifiersURN: urn:nbn:se:kth:diva-10954OAI: oai:DiVA.org:kth-10954DiVA: diva2:233072
QC 201006172009-08-272009-08-272010-07-20Bibliographically approved