Analyze the vibration mode of 1-3-2 piezoelectric composite

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.