Output Characteristics of a Disk-Type Piezoelectric Energy Harvester with Respect to Geometric Aspect Ratio

This study analyzes piezoelectric devices operating in the thickness vibration mode by examining models with various diameter-to-thickness ratios. Theoretical calculations and COMSOL finite element simulations, and experimental measurements were conducted using Pb(Ni1/3Nb2/3)O3-Pb(Zr Ti)O3-based ceramic materials. The results demonstrate that the resonance and anti-resonance frequencies generally decrease as the diameter-to-thickness ratio increases. The close agreement between experimental measurements and simulation results validates the reliability of the simulation approach.