Electromechanical Analysis of a Beam Piezoelectric Transducer Energy Harvest Device

摘要

This paper considers the vibtation problem of beam piezoelectric transducer. Traditional reasearches face difficulties in providing the analytical expression for the piezoelectric effect of the piezoelectric vibrator with a mass at its end as well as the improper model of piezoelectric vibrators which work in high-frequency band. In this paper, the nature of the current output in a large frequency range is explored. Firstly, static analysis of cantilever is conducted and the piezoelectric effect under a certain deformation were formuled. Next, the main vibration modes of the cantilever were modified so that the main modes are of orthogonality in nature and satisfy the boundary conditions. The dynamic deflection of the piezoelectric cantilever was also investigated using the modified vibration modes. Charge outputs of piezoelectric cantilever beam are also demonstrated. Finally, based on the theoretical analysis, some numerical results are given.