Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Experimental measurement of the electro mechanical parameters of an energy harvesting system using cantilever beam.
Submission Author:
Rafael de Matos Moraes , SP
Co-Authors:
Niederauer Mastelari, Rafael de Matos Moraes
Presenter: Rafael de Matos Moraes
doi://10.26678/ABCM.COBEM2017.COB17-2698
Abstract
Harvesting ambient energy provides an opportunity to enable self-powered sensors and instrumentation for big structures such as bridges or petroleum risers. Thus, is increasing the interest for harvest devices of mechanical vibration energy. They are an attractive alternative for removable batteries in these structures, avoiding high cost riskily maintenances, increasing the life time and reliability of structural monitoring systems. Among harvest mechanical sources the piezoelectric conversion principle offers the simplest approach, because there is no need for having complex geometries and mechanisms. By this technic, vibrations are directly converted into electricity through the piezoelectric devices. This work presents a cantilever beam in which has been assembled piezoelectric device. This simple structure has been used for harvest energy study purposes, and has modeled as a mass-spring-damper system operating at first resonance frequency. By this experimental arrangement, it has been possible validate the model, checking if the theoretical calculations has been according the experimental results. The objective has get main electrical and mechanical system parameters such as stiffness of the piezoelectric material, piezoelectric output capacitance, electromechanical coupling factor, natural frequency and damping rate. This knowledge is important to design suitable electronic circuits that match impedances of harvest energy device with power storage device getting maximum efficiency. Electronic Circuit designs and measurement results are presented.
Keywords
energy harvesting, Cantilever beam., Power Harvester
