Eventos Anais de eventos
DINAME 2017
XVII International Symposium on Dynamic Problems of Mechanics
Dynamic Characterization and Efficiency Analysis of Multi Degree of Freedom Piezoelastic Energy Harvesters from Structural Vibrations
Submission Author:
Akio Hanasiro , SP , Brazil
Co-Authors:
Akio Hanasiro, paulo varoto
Presenter: Akio Hanasiro
doi://10.26678/ABCM.DINAME2017.DIN17-0210
Abstract
In the past decade considerable research efforts have been dedicated to the process of converting structural vibration signals into usable electric energy by employing piezoelectric materials, frequently referred to as piezoelectric energy harvesting (PEH). Base driven electromechanical single degree of freedom (SDOF) models such as the well known cantilever beam has inspired many relevant contributions in this area. Despite its versatility, SDOF presents limitations specially related to frequency tuning and bandwidth of operation. Multi degree of freedom (MDOF) models appeals as a valid modeling strategy to enhance the mechanical to electrical energy conversion process. The main goal of this article is to assess the feasibility and efficiency of employing MDOF models in the design of piezoelastic energy harvesters. A distributed parameter model is formulated of an L-shape harvester covered with segmented piezoceramics. Numerically simulated results have shown significant differences on the harvester’s output electric energy power for different simulation scenarios where the amount of piezoelectric elements as well as their spatial distribution on the host structure were varied. Experimental tests were performed on a prototype and measured results were in good agreement with the corresponding simulated data.
Keywords
piezoelectric energy harvesting, L-Shape Beams, Structural Vibrations, Harvesting Efficiency
