The objective of this work was to study the effect of plasma actuators in attenuating low-speed flow-induced cavitytones from a control point of view by employing techniques from classical control. A modification of the existingphysics-based linear model produced a new variable structure model in which a plasma actuator was regarded as alinear gain. The parameters of the overall model working at two operating voltages were identified usingexperimental data. The effects of the plasma actuator control at other various operating voltages were thus able to bepredicted using linear interpolation. The good agreement between the predicted and the measured data supportedthe proposed variable structure model, inside of which plasma actuators affected the damping of cavity pressureoscillations proportionally to the applied voltage to reduce flow-induced tonal noise. With the proposed variablestructure model the system stability controlled by plasma actuators at various operating voltages was ensured, thus aclosed-loop control method could be applied without leading to instability. A simple proportional integral derivativecontroller was implemented. Results show the potential of a closed-loop method by increasing system powerefficiency.
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