Advanced Modeling and Optimization of Piezoelectric Composites
Abstract
The aim of this project was to obtain a more complete understanding of the physical phenomena occurring in piezoelectric transducers, with the aim of obtaining optimal designs and improved manufacturability. Of key importance in design are conversion efficiency, bandwidth, and control of spurious modes. The transducer structures considered are 1: 3, 0:3, 2:2, and 1: 3: 1. Contributions to the advancement of 1:3 modeling and fabrication are: (1) finite element modeling of composite lattices with complex unit cells, (2) transmission line and reciprocity modeling of distributed period composites, (3) fabrication of test transducers for verification of the modeling principles. New modeling theory for 0:3 composites aims at replacing the empirical cubes model with a model consisting of nearly close-packed spherical particles. This approach estimates more closely the performance of 0:3 composites and points the way for further studies. The 2:2 structures considered are, in fact, multilayered electroded transducers with a single piezoelectric material. But multiple piezoelectrics and alternating piezo and nonpiezo layers may also be considered. A procedure has been developed, and confirmed experimentally, for tailoring the transducer time-domain response by applying multiple excitations. Finally, 1:3:1 transducers with a periodic addition of empty voids have been developed. This version produces a more uniform thickness mode displacement and improved coupling, predicted from finite element modeling and confirmed experimentally. Transducer, Composite, Finite Element, Piezoelectric, Multilayer, Spurious Modes, 1:3, 0:3, 2:2, 1:3:1, Time-domain Response, Thickness Mode, Optimal Designs, Improved Manufacturability.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1992
- Accession Number
- ADA253800
Entities
People
- Bert A. Auld
- John A. Hossack
Organizations
- Stanford University