Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
STAR-SHAPED ENERGY HARVESTING SYSTEM FOR MULTIDIRECTIONAL AND WIDEBAND EXCITATIONS
Submission Author:
Virgilio Junior Caetano , RJ , Brazil
Co-Authors:
Virgilio Junior Caetano, Marcelo Savi
Presenter: Virgilio Junior Caetano
doi://10.26678/ABCM.COBEM2021.COB2021-0296
Abstract
Energy harvesting systems based on piezoelectric vibration devices have been developed for several applications and the main challenge is to enhance the device energy generation capacity. Ambient vibration excitations present multidirectional and broadband spectrum characteristics. In this regard, several research projects deal with the expansion of frequency bandwidth but the vibration direction effect on the harvester performance is usually neglected, treating excitations in the transversal direction. Piezoelectric energy harvesters (PEH) enhancement needs to consider multidirectional vibration energy in a broadband spectrum. In this work, a multimodal broadband PEH to extract energy from multidirectional excitations is investigated. The proposed harvester consists of a star-shaped structure composed of three L-shaped beams, six piezoelectric patches, and four pendular masses bonded to the main structure. The inertial pendular masses are used to harvest energy from multidirectional excitations in a wideband spectrum. Finite element analysis is developed using ANSYS. Simulations are carried out to design the system to operate in a desired operational frequency range and to evaluate the harvester performance. The proposed device is investigated under in-plane and out-of-plane excitations. Results show that the harvester presents performance advantages in terms of broadband spectrum and multidirectional sensitivity compared with conventional linear single-mode and unidirectional energy harvesters.
Keywords
energy harvesting, multidirectional harvester, multimodal systems, Finite Element Analysis, Piezoelectric
