Summary
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.
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Williams, D., Kerstens, W., Pfeiffer, J., King, R., Colonius, T. (2010). Unsteady Lift Suppression with a Robust Closed Loop Controller. In: King, R. (eds) Active Flow Control II. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 108. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-11735-0_2
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DOI: https://doi.org/10.1007/978-3-642-11735-0_2
Publisher Name: Springer, Berlin, Heidelberg
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