Piezoelectric actuators for fluid-flow control

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Abstract
The characteristics of cantilever piezoelectric actuators are investigated both theoretically and experimentally. The type of actuators considered consist of a single sheet of piezoceramic material bounded to a shim--termed a `unimorph' design. A theoretical model, based on beam theory, is developed to predict the static and dynamic behavior of the actuator. The model predictions compare favorably to measurements of the actuator transfer function. A sample application to noise reduction of flow-induced cavity oscillations at low subsonic speeds is described. Use of the actuators in an open-loop control system resulted in 18 and 25 dB attenuation in the broadband and primary tone sound pressure levels, respectively.

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