Optimum design of the thickness vibration modal

In actual work, the dimension of PZT piezoelectric ceramics disks is limited. There is a strong coupling between the fundamental frequency of thickness vibration and the higher order modes of radial vibration. In this paper, the impact of coupling is analyzed by theoretical calculation and finite element simulation. In order to optimize the thickness vibration, this paper presents a drilling method at the disk center to adjust the frequency of high order radial vibration by pore size. Experiments show the effectiveness of the drilling method for optimizing the thickness vibration mode.