Modeling of hollow cylinder piezoelectric resonator with current excitation by a double Legendre polynomial method

Abstract

This article presents an extension of the double Legendre polynomial method to model and evaluate the axisymmetric free vibration problem for the axially polarized piezoelectric resonator. The aim is to show the benefit of the employed method. The polynomial series was used to define the mechanical displacements and electrical potential at the same time. The proposed approach considerably improves computing efficiency by avoiding much of the numerical integration calculations. As a result, the electromechanical coupling coefficient shows that the fundamental mode is the most piezoactive mode in the structure. Furthermore, the electrical input impedance and field profiles are easily presented.

Keywords:

• Double Legendre polynomial approach
• piezoelectric resonators
• normalized electrical impedance
• resonance and anti-resonance frequencies
• fields profiles
• electromechanical coupling coefficient