Finite element analysis of mechanical-vibration-driven flexible piezoelectric energy harvesting device

摘要

The piezoelectric energy harvesting devices for the conversion of mechanical vibration into electric energy via a flexible piezoelectric energy harvesting (FPED) structure have gained greater attention. Here, the large deformation of the FPED structure causes a strong interaction with the electric field (direct-piezoelectric effect) and structural field (inverse-piezoelectric effect), and vice-versa. A mathematical and numerical model of the complex physical system of the involved multiphysics coupling characteristics in order to predict the operational properties and to increase the performance is very important. The presentation will discuss a partitioned coupling algorithm based on the force and moment transformation, and pseudo piezoelectric evaluation method which involves electro-mechanical coupling based on the finite element method (FEM). Results obtained with the finite element analysis are compared with the experimental results of PEHDs with base excitation reported in the literature.