Citation:
M. Debiasi, J. Little, A. Serrani, et al., Influence of stochastic estimation on the control of subsonic cavity flow – A preliminary study. 3rd AIAA Flow Control Conference, 5-8 June 2006, San Francisco, CA, USA.
Abstract:
This work aims at understanding how the different elements involved in the feedback
loop influence the overall control performance of a subsonic cavity flow based on reducedorder
modeling. To this aim we compare preliminary and limited sets of experimental
results obtained by modifying some relevant characteristics of the loop. Our results support
the findings in the literature that use of quadratic stochastic estimation is preferable to the
linear one for real-time update of the model parameters. They also seem to indicate the
merit of using more than one time sample of the pressure for performing the real-time
update of the model through stochastic estimation. The effect of using two different sets of
pressure signals for the stochastic estimation also corroborates previous findings indicating
the need for optimizing the number and the placement of the sensors used in the feedback
control loop. Finally we observed that the characteristics of the actuator can alter
significantly the overall control effect by introducing in the feedback loop additional,
undesirable frequency components that are not modeled and hence controlled. A
compensator for the actuator is currently being designed that will alleviate this problem thus
enabling a clearer understanding of the overall control technique.
