Electromechanical Model Applied to Piezoelectric Resonators

Abstract

The synthesis of an electromechanical model for 500 kHz and 1 MHz piezoelectric resonators used in low cost ultrasound transducer was performed. In the electromechanical simulations were considered the losses involved in the piezoelectric phenomenon and the efficiency in the transformation from mechanical to electrical energy and vice versa. An optimization algorithm was implemented and used to compare the proposed model with the electrical impedance curves obtained experimentally for two pure piezoelectric ceramics of PZT and two piezocomposites made from them. The results show the model predicts correctly the electrical impedance behavior and the mechanical and electrical properties of both piezoceramic and piezocomposites, as long as the losses are considered.