Nonlinear equivalent circuit of high-power sandwich piezoelectric ultrasonic transducer

In the theoretical design and analysis of the sandwich piezoelectric ultrasonic transducer, the transducer is considered to be an ideal linear system, where the dielectric, piezoelectric and mechanical losses are neglected. However, when the transducer is driven at high power, the losses are becomin...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2022-11, Vol.69 (11), p.1-1
Main Authors: Yu, Jiawei, Xu, Long
Format: Article
Language:English
Subjects:
Acoustic velocity
Acoustics
Ceramics
Circuit design
Complex constants
Dielectrics
Equivalent circuits
FE simulation
Finite element method
Longitudinal waves
Mathematical models
nonlinear equivalent circuit
nonlinear resonance frequency equation
Parameters
Piezoelectric ceramics
Resonant frequency
sandwich piezoelectric ultrasonic transducer
Transducers
Ultrasonic transducers
Wavelengths
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Summary:In the theoretical design and analysis of the sandwich piezoelectric ultrasonic transducer, the transducer is considered to be an ideal linear system, where the dielectric, piezoelectric and mechanical losses are neglected. However, when the transducer is driven at high power, the losses are becoming several times higher comparing them to low signal measurements, and the transducer works in a nonlinear state. In order to predict the performance of the transducer at high power, the nonlinear parameters (complex constants) of the piezoelectric materials are introduced. The corresponding nonlinear equivalent longitudinal wave sound velocity, the nonlinear equivalent longitudinal wave number of the piezoelectric ceramics are derived. Then the nonlinear equivalent circuit (NEC) and the nonlinear resonance frequency equation of the high-power sandwich piezoelectric ultrasonic transducer that related with the losses are deduced. Then, the nonlinear finite element model (NFEM) of the transducer is constructed. The performance parameters of the transducer obtained by the NEC method and the FE method are compared with each other, and consistent results have been achieved by two methods. Finally, the contribution of various losses is obtained through theoretical calculation, simulation and experimental measurement, and the correctness of the theoretical model in this paper is verified.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2022.3208619