Analysis of Interactions Between Vibration Modes of Piezoelectric Vibrators

Abstract

To broaden the frequency regulation range of piezoelectric motors, this paper proposes a piezoelectric vibrator that operates in multiple in-plane vibration modes with distinct resonance frequencies. The piezoelectric vibrator was constructed by reasonably arranging multiple groups of piezoelectric ceramic (PZT) sheets based on the most typical rectangular plate piezoelectric motors. Suitable working modes were selected, and the excitation method of these operating modes was also analyzed. Besides, interactions between selected operating modes were also investigated. The finite element software, ANSYS, was adopted to optimize the structural parameters of the vibrator through modal analysis to match the resonance frequencies of specific modes. After that, whether the selected operating modes can be successfully motivated was verified by harmonic response analysis. Finally, the vibration characteristics of piezoelectric vibrators under conventional vibration modes and multiple modes were acquired by transient analysis, respectively. Simulation results reveal that under dual-frequency excitation scheme 1, response displacements of the driving point are relatively larger. This strategy not only facilitates the excitation of B<inf>4</inf> mode but also enables control over the ratio of horizontal to vertical displacements of the driving point. Additionally, incorporating B<inf>4</inf> mode expands the frequency adjustment range of piezoelectric vibrators.