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Journal of Intelligent Material Systems and Structures
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Adaptive Active Control of Instabilities

Guy Billoud

Fluid Dynamics and Acoustics Laboratory CNRS URA 263 Ecole Centrale de Lyon BP 163, 69131 Ecully Cedex France

Marie Annick Galland

Fluid Dynamics and Acoustics Laboratory CNRS URA 263 Ecole Centrale de Lyon BP 163, 69131 Ecully Cedex France

Can Huynh Huu

EM2C Laboratory CNRS Ecole Centrale de Paris 92295 Chatenay Malabry Cedex France

Sébastien Candel

EM2C Laboratory CNRS Ecole Centrale de Paris 92295 Chatenay Malabry Cedex France

This article reports the results of an experimental investigation in which adaptive methods are applied to various situations of active control of flow instabilities: combustion instabilities, flow-excited cavity oscillations, and compressor surge. The pres ent work draws attention especially to the adaptive controller behaviour and capacities. The main results are as follows: 1) The adaptive controller manages to automatically find its optimal characteristics in order to cancel the instability in the three experiments under consideration; 2) It is able to cope with time-dependent changes in the operating condi tions such as flow velocity sweeps for the oscillating cavity and air and propane mass flow rate variations in the combustion instability experiment; and 3) In the case of the Helmholtz cavity resonator, the algorithm has also exhibited capacity to recover effective control even when initially set such that artificial closed-loop instabilities induced by the control system occurred.

Journal of Intelligent Material Systems and Structures, Vol. 2, No. 4, 457-471 (1991)
DOI: 10.1177/1045389X9100200402
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