Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Effect of segmented electrodes on piezoelectric energy harvesting performance from a graded metastructure
Submission Author:
Camila Schimidt , RJ , Brazil
Co-Authors:
Camila Schimidt, Vagner Candido de Sousa, Carlos De Marqui Junior
Presenter: Camila Schimidt
doi://10.26678/ABCM.COBEM2021.COB2021-1837
Abstract
In this work, we investigate piezoelectric energy harvesting from localized modes of a graded metamaterial beam (or metastructure). The metastructure has periodically distributed elastic resonators and the grading parameter is the linear variability in the resonant frequency of the elastic attachments. Moreover, the host beam is fully covered on the top and bottom surfaces by piezoceramic layers with continuous electrodes. A criterion for electrodes segmentation is presented to avoid cancelation of electrical output from a target localized mode. A load resistance is considered in the electrical domain of each electrode segment in order to estimate the power output. The governing equations are given using modal analysis, and the transverse displacement of the beam as well as power output from each segment are solved in the frequency domain. The electroelastic behaviors of a continuous electrode case and of a segmented electrode configuration are compared. The bandwidth increases 49% when an increasing linear variation in the frequency of the absorbers is considered. Furthermore, the power harvested for the segmented electrode configurations is orders of magnitude larger than that for the continuous electrodes configuration.
Keywords
energy harvesting, graded metamaterial, strain nodes, electrode configuration
