UNIDIMENSIONAL MODELING OF MULTILAYERED PIEZOELECTRIC TRANSDUCER STRUCTURES

Multi-layered transducer structures offer the potential of improved pe rformance in terms of increased transmit sensitivity, greater bandwidt h, and enhanced reception characteristics. Unfortunately, the successf ul design of such devices is often difficult, owing to the complex int eraction between the active piezoelectric layers and passive intermedi ate interface layers. Furthermore, in many practical applications, the loading effects imposed by the electrical drive circuitry often limit the performance improvements that may be physically realized. This pa per describes the development of a comprehensive, unidimensional model ing approach. This model may be employed to facilitate the analysis an d subsequent optimization of laminated transducer assemblies. The devi ces currently under consideration include both piezoceramic and piezop olymer configurations, as well as alternative piezocomposite designs. The effects of varying bondline thickness and the introduction of pass ive interface layers are examined, as is the influence of the electric al load circuitry on overall system response. The ability to accuratel y predict the response of stacked piezoelectric structures is demonstr ated through extensive comparison of experimental and theoretical resp onses. This paper concludes by highlighting the important role that mo deling plays in the design, fabrication, and optimization of complex m ulti-layered transducer assemblies.