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Unsteady Lift Suppression with a Robust Closed Loop Controller

Williams, David and Kerstens, Wesley and Pfeiffer, Jens and King, Rudibert and Colonius, Tim (2010) Unsteady Lift Suppression with a Robust Closed Loop Controller. In: Active Flow Control II. Notes on Numerical Fluid Mechanics and Multidisciplinary Design . No.108. Springer , Berlin, Germany, pp. 19-30. ISBN 9783642117343.

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The ability to control lift in unsteady flows using active flow control is examined experimentally with a three-dimensional, low-aspect-ratio wing and pulsed-blowing actuators as the test article. An unsteady flow wind tunnel is used to generate step-like and harmonic oscillations in flow speed and the corresponding fluctuating lift force on the wing. A 'black box' model of the wing response to actuation is obtained using conventional system identification techniques. A robust H _∞  controller is designed with a mixed sensitivity loop-shaping technique, whose objective was to maintain a constant lift in the unsteady flow. The controller is shown to be capable of significant reductions in lift fluctuations given step, harmonic and random input disturbance conditions.

Item Type:Book Section
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URLURL TypeDescription ReadCube access
Colonius, Tim0000-0003-0326-3909
Additional Information:© Springer-Verlag Berlin Heidelberg 2010. The support for this work by the U.S. Air Force Office of Scientific Research MURI (FA9550-05-0369) with program manager Dr. Fariba Fahroo is gratefully appreciated. David Williams gratefully acknowledges the partial support of the Alexander von Humboldt foundation. We also acknowledge the support from the Illinois NASA Space Grant Consortium for Wesley Kerstens.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-05-0369
Alexander von Humboldt FoundationUNSPECIFIED
Subject Keywords:Wind Tunnel; Unsteady Flow; Flow Speed; Lift Coefficient; Feed Forward Control
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Issue or Number:108
Record Number:CaltechAUTHORS:20190717-102317714
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97190
Deposited By: Melissa Ray
Deposited On:17 Jul 2019 18:13
Last Modified:05 May 2020 18:29

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