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Model-based control of cavity oscillations. II - System identification and analysis

Rowley, Clarence W. and Williams, David R. and Colonius, Tim and Murray, Richard M. and MacMartin, Douglas G. and Fabris, Drazin (2002) Model-based control of cavity oscillations. II - System identification and analysis. In: 40th AIAA Aerospace Sciences Meeting & Exhibit, 14-17 January 2002, Reno, NV.

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Experiments using active control to reduce oscillations in the flow past a rectangular cavity have uncovered surprising phenomena: in the controlled system, often new frequencies of oscillation appear, and often the main frequency of oscillation is split into two sideband frequencies. The goal of this paper is to explain these effects using physics-based models, and to use these ideas to guide control design. We present a linear model for the cavity flow, based on the physical mechanisms of the familiar Rossiter model. Experimental data indicates that under many operating conditions, the oscillations are not self-sustained, but in fact are caused by amplification of external disturbances. We present some experimental results demonstrating the peak-splitting phenomena mentioned above, use the physics-based model to study the phenomena, and discuss fundamental performance limitations which limit the achievable performance of any control scheme.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription Paper Paper
Rowley, Clarence W.0000-0002-9099-5739
Colonius, Tim0000-0003-0326-3909
Murray, Richard M.0000-0002-5785-7481
MacMartin, Douglas G.0000-0003-1987-9417
Additional Information:© 2001 by the authors. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission. We would like to thank Andrzej Banaszuk for many helpful comments, and for suggesting the method for distinguishing between stable and unstable noisy systems. The theoretical work was supported by AFOSR under grant F49620-98-1-0095 with program manager Dr. Thomas Beutner. The experimental work was supported by AFOSR under grant F49620-98-1-0276, with program manager Dr. Steve Walker.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)F49620-98-1-0095
Air Force Office of Scientific Research (AFOSR)F49620-98-1-0276
Subject Keywords:Aerospace Systems, Operations and Life Cycle
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Other Numbering System NameOther Numbering System ID
AIAA Paper2002-0972
Record Number:CaltechAUTHORS:20190709-092100972
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96973
Deposited By: Melissa Ray
Deposited On:11 Jul 2019 16:44
Last Modified:16 Nov 2021 17:25

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