Abstract
| Language | English |
|---|---|
| Pages | 472-475 |
| Number of pages | 4 |
| DOIs | |
| Publication status | Published - Oct 2006 |
| Event | 2000 IEEE International Ultrasonics Symposium - Caribe Hilton, San Juan, Puerto Rico Duration: 22 Oct 2000 → 25 Oct 2000 |
Conference
| Conference | 2000 IEEE International Ultrasonics Symposium |
|---|---|
| Country | Puerto Rico |
| City | San Juan |
| Period | 22/10/00 → 25/10/00 |
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Keywords
- elasticity
- photonic band gap
- periodic structures
- mathematical model
- equations
- electric potential
Cite this
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Incorporation of viscoelastic loss into the plane wave expansion approach to modelling composite transducers. / Orr, L.; Mulholland, A.J.; O'Leary, R.L.; Hayward, G.
2006. 472-475 Paper presented at 2000 IEEE International Ultrasonics Symposium, San Juan, Puerto Rico.Research output: Contribution to conference › Paper
TY - CONF
T1 - Incorporation of viscoelastic loss into the plane wave expansion approach to modelling composite transducers
AU - Orr, L.
AU - Mulholland, A.J.
AU - O'Leary, R.L.
AU - Hayward, G.
PY - 2006/10
Y1 - 2006/10
N2 - The plane wave expansion (PWE) method has been proposed as a theoretical model for periodic composite ultrasonic transducers. This paper extends previous work by importantly including viscoelastic loss in the material parameters. Some of the issues with model formulation, such as ill-conditioning in the large matrices, have been addressed through parameter scaling and Tikhonov regularisation. Identification of each mode of vibration has been carried out by visualising the spatial and temporal profiles of the displacement, electrical potential and Poynting vector. A comparison between the theoretical predictions and experimental data from a piezoelectric composite device is presented. The effect that the elastic properties of the passive phase have on device performance is also investigated. It is found that high shear attenuation in the passive phase gives rise to a large frequency stop band gap around the fundamental thickness mode.
AB - The plane wave expansion (PWE) method has been proposed as a theoretical model for periodic composite ultrasonic transducers. This paper extends previous work by importantly including viscoelastic loss in the material parameters. Some of the issues with model formulation, such as ill-conditioning in the large matrices, have been addressed through parameter scaling and Tikhonov regularisation. Identification of each mode of vibration has been carried out by visualising the spatial and temporal profiles of the displacement, electrical potential and Poynting vector. A comparison between the theoretical predictions and experimental data from a piezoelectric composite device is presented. The effect that the elastic properties of the passive phase have on device performance is also investigated. It is found that high shear attenuation in the passive phase gives rise to a large frequency stop band gap around the fundamental thickness mode.
KW - elasticity
KW - photonic band gap
KW - periodic structures
KW - mathematical model
KW - equations
KW - electric potential
U2 - 10.1109/ULTSYM.2006.126
DO - 10.1109/ULTSYM.2006.126
M3 - Paper
SP - 472
EP - 475
ER -