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Smart Ferroelectrics for Acoustic and Vibration Control

Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802

A.S. Bhalla

Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802

L.E. Cross

Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802

The dynamic compliance coefficient S₃₃ of hard ceramic structures can be changed by incorporating them as sensor-actuator combinations and applying electronic feedback in proper phase. These smart ceramic structures can sense and react to pressure fluctuations by changing their compliance so that energy can be removed from the stimulus. Some basic geometries of smart struc tures in which there is negligible field coupling between the sensor and the actuator and a basic smart structure with very high field coupling are developed and their applications in active vibration control investigated. Results for narrowband vibration control are presented which clearly show that ceramic structures can be made harder or softer depending on the phase of the feedback signal.

Journal of Intelligent Material Systems and Structures, Vol. 5, No. 5, 678-682 (1994)
DOI: 10.1177/1045389X9400500512


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