A non direction high-frequency acoustic transducer had been designed and prepared with PZT-5 type piezoelectric
ceramic ring. When the piezoelectric ceramic ring vibrates on its thickness mode, the resonant frequency is higher than
that of other modes. The affiliations of the resonant frequency and the size of the piezoelectric ceramic ring transducer
are obtained by finite element analysis. The resonant frequency of the transducer increases when the thickness of the
piezoelectric ceramic ring decreases. The resonant frequency of the transducer increases slowly when the height of the
piezoelectric ceramic ring decreases. The inner diameter of piezoelectric ceramic ring has nothing to do with its
thickness resonant frequency. The actual sample is produced for verifying the accuracy of the simulation results. The
affiliation of the resonant frequency and the size of actual transducer is the same as the simulation results. So we have
produced a high-frequency acoustic transducer whose resonant frequency is 290 kHz and the maximum transmit voltage
response of the product is 143dB. Compare the products and the traditional cylindrical transducers, the products haven't
only a good non direction circle directional, but it also has a high resonant frequency (290 kHz).
Based on finite element analysis method, harmonic analyses with infinite and finite boundary conditions have been
performed to investigation the vibration mode of 1-3-2 piezoelectric composite. This method has been checked by the
experimental data of 1-3-2 PZT5A/Polymer-618 piezoelectric composites. The admittance curves of samples have been
calculated under different boundary conditions. The calculation shows that finite element analysis with infinite boundary
condition can be used to simulate the thickness mode, and the error is less than 1.5%. But it is incapable of simulation
the interferential vibration mode accrued near to the thickness vibration frequency. To avoid non-considering of
periodicity and boundary condition in conventional FEA method, limited elements have been used in FEA model to
simulate periodicity and boundary condition. Finite element analysis with finite boundary condition is a substitute way to
simulate the high order of lamb mode. The 8th order of lamb mode and the thickness mode have been simulated under
finite boundary. It shows a good match between the simulation results and the test results by using laser scanning
vibrometer while element number equals to 64 or the width/thickness of model is larger than 2.
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