Abstract
This paper analytically derives the transfer functions for piezoceramic and conventional tranducers and characterizes their relationships in terms of frequency response function (FRF) and modal parameters such as natural frequencies, damping ratios, and mode shapes. The FRFS between accelerometer/point force actuator, accelerometer/PZT actuator, PVDF sensor/point force actuator, and PVDF sensor/PZT actuator are determined, respectively. Those FRFs are expressed in conventional modal model format which can clearly get insight of physical meaning of modal parameters. In particular, the mode shapes of accelerometer, point force actuator, PVDF sensor, and PZT actuator are identified and are proportional to the displacement mode shapes. The point and transfer FRFs are then studied to characterize their properties for either pair of transducer applications. This work leads to the basis for active structural vibration and acoustic control and also draws on ideas for applications of smart structural testing to system identification and diagnosis.
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