Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
EXPERIMENTAL ANALYSIS OF AN ENERGY HARVESTING SYSTEM WITH PIEZOELECTRIC AND SHAPE MEMORY ALLOY ELEMENTS
Submission Author:
Arthur Adeodato , RJ
Co-Authors:
Brenno Tavares Duarte, Ricardo Alexandre Amar de Aguiar, Luciana Loureiro da Silva Monteiro, Marcelo Savi, Pedro Manuel Calas Lopes Pacheco, Arthur Adeodato
Presenter: Arthur Adeodato
doi://10.26678/ABCM.COBEM2017.COB17-1912
Abstract
Conversion of environmental mechanical vibrations into electrical power has attracted the attention of several researchers, introducing the concept of energy harvesting by using piezoelectric materials. Optimal operational conditions for energy harvesting devices using piezoelectric elements occurs when the system external excitation is close to it resonance frequency. Large reduction of generated power can occur outside of this condition, and the use of adaptive device strategies is an interesting approach. As the environmental sources usually operate within a range of vibration frequencies, the synergic effect of piezoelectric materials and shape memory alloys (SMA) can be used to increase the operating range of the system using the pseudoelastic and shape memory alloy effects. SMAs hysteretic effects and material elastic modulus variations associated to phase transformations introduces changes in the damping and stiffness characteristics of the SMA element. These changes affect the system dynamic allowing the tuning of the system with the excitation frequencies. This work deals with an experimental analysis of a piezoelectric cantilever beam coupled with a shape memory alloy helical spring excited by a shaker considering different vibration conditions and temperatures. Experimental results show that the proposed device configuration can be used to extend the operational range of the device for variable vibration excitation conditions.
Keywords
energy harvesting, Piezoeletric materials, Shape memory alloys (SMA), experimental analysis
