Linear models for control of cavity flow oscillations - Revision history

Murray at 13:38, 17 May 2016

2016-05-17T13:38:23Z

← Older revision		Revision as of 13:38, 17 May 2016
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	{{HTDB paper		{{HTDB paper
	\| authors = C Rowley, D Williams, Tim Colonius, Richard M Murray and ~~Doug~~ G. MacMartin		\| authors = C Rowley, D Williams, Tim Colonius, Richard M Murray and Douglas G. MacMartin
	\| title = Linear models for control of cavity flow oscillations		\| title = Linear models for control of cavity flow oscillations
	\| source = Journal of Fluid Mechanics, 547:317-330		\| source = Journal of Fluid Mechanics, 547:317-330

Murray at 13:37, 17 May 2016

2016-05-17T13:37:54Z

← Older revision		Revision as of 13:37, 17 May 2016
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	{{HTDB paper		{{HTDB paper
	\| authors = C Rowley, D Williams, Tim Colonius, Richard M Murray		\| authors = C Rowley, D Williams, Tim Colonius, Richard M Murray and Doug G. MacMartin
	\| title = Linear models for control of cavity flow oscillations		\| title = Linear models for control of cavity flow oscillations
	\| source = Journal of Fluid Mechanics, 547:317-330		\| source = Journal of Fluid Mechanics, 547:317-330

Murray: htdb2wiki: creating page for 2004b_row+04-jfm.html

2016-05-15T06:18:26Z

htdb2wiki: creating page for 2004b_row+04-jfm.html

New page

{{HTDB paper
| authors = C Rowley, D Williams, Tim Colonius, Richard M Murray
| title = Linear models for control of cavity flow oscillations
| source = Journal of Fluid Mechanics, 547:317-330
| year = 2006
| type = Preprint
| funding =
| url = http://www.cds.caltech.edu/~murray/preprints/row+06-jfm.pdf
| abstract = Models for understanding and controlling oscillations in the flow past a rectangular cavity are developed. These models may be used to guide control designs, to understand performance limits of feedback, and to interpret experimental results. Traditionally, cavity oscillations are assumed to be self-sustained: no external disturbances are necessary to maintain the oscillations, and amplitudes are limited by nonlinearities. We present experimental data which suggests that in some regimes, the oscillations may not be self-sustained, but lightly damped: oscillations are sustained by external forcing, such as boundary-layer turbulence. In these regimes, linear models suffice to describe the behaviour, and the final amplitude of oscillations depends on the characteristics of the external disturbances. These linear models are particularly appropriate for describing cavities in which feedback has been used for noise suppression, as the oscillations are small and nonlinearities are less likely to be important. It is shown that increasing the gain too much in such feedback control experiments can lead to a peak-splitting phenomenon, which is explained by the linear models. Fundamental performance limits indicate that peak splitting is likely to occur for narrow-bandwidth actuators and controllers.
| flags =
| tag = row+04-jfm
| id = 2004b
}}