Eventos Anais de eventos
DINAME 2023
XIX International Symposium on Dynamic Problems of Mechanics
Performance Investigation of Mechanical Multimodal Energy Harvesting Designs for Multimodal Excitations
Submission Author:
Virgilio Junior Caetano , RJ , Brazil
Co-Authors:
Virgilio Junior Caetano, Marcelo Savi
Presenter: Marcelo Savi
doi://10.26678/ABCM.DINAME2023.DIN2023-0079
Abstract
Energy harvesting from ambient mechanical vibration has been investigated as an alternative to power sources like batteries that have limitations due to periodic need of recharge and ultimately replacement. Ambient vibration excitations usually feature in a multidirectional and broadband frequency spectrum. In this regard, one of the main challenges is to develop devices capable of adapting to diverse sources of environmental excitation, being able to adapt and efficiently operate over a wideband spectrum. This work investigates multimodal and multidirectional designs of piezoelectric energy harvesting systems considering different ambient conditions. Different circular, pizza and star-shaped designs are proposed, comparing their performance with conventional cantilever-beam devices. The finite element method is employed to model system dynamics. An optimization procedure is applied to the system aiming to seek a configuration that can extract energy from multidirectional broadband frequency spectrum and maximize its output power. Modal, harmonic, and transient numerical simulations are carried out to investigate the harvester performances under multidirectional excitations. Results show that the proposed multimodal harvester designs have potential to harness energy from multidirectional wideband ambient vibration sources, serving as an alternative to conventional linear single-mode energy harvesters.
Keywords
energy harvesting, Multimodal, Multidirectional, Piezoelectricity, Finite Element Analysis
