Finite-Element Analysis of 1-3 Piezocomposites for High-Power Ultrasound Transducers
碩士 === 中華大學 === 機械工程學系碩士班 === 101 === Finite element modeling of 1-3 PZT-epoxy composite matrices was performed in this study for analyzing the relationship between geometric parameters and electro-acoustic conversion efficiency of high power ultrasonic transducers. A commercial software ANSYS was e...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2013
|
| Online Access: | http://ndltd.ncl.edu.tw/handle/w9j3jj |
| Summary: | 碩士 === 中華大學 === 機械工程學系碩士班 === 101 === Finite element modeling of 1-3 PZT-epoxy composite matrices was performed in this study for analyzing the relationship between geometric parameters and electro-acoustic conversion efficiency of high power ultrasonic transducers. A commercial software ANSYS was employed to simulate the static vibration of the composites. PZT4 and PZT8 pillars were modeled by numerical element SOLID 5. In addition，numerical element SOLID 45 was used to model epoxy301 and epoxy314 filler. Six composite transducers with geometric parameters used in the simulation were fabricated in the laboratory.
The results of simulation showed that the average displacement of the composites with the PZT4 aspect ratio (AR) of 0.2 was larger than that of the composites with AR of 0.47 under the condition of the same PZT4 volume fraction (VF). The efficiency of 0.2-AR transducer is indeed higher than that of 0.47-AR transducer as simulated results. Efficiency measurements of six flat PZT4-epoxy composite transducers with different geometric parameters and finite-element transient analyses of the inter-pillar electrical-mechanical coupling in the composites were performed. At the same aspect ratio of a PZT4 pillar, the asymmetry of the driving voltage caused by the amplitude reduction and waveform distortion degraded the efficiency of the composite transducers and became more severe when decreasing the gap.
|
|---|