ENERGY HARVESTING USING INTERFACE MODES OF A PHONONIC CRYSTAL ELASTIC ROD SYSTEM
Lucas Rafael Carneiro de Aguiar1; José Roberto de França Arruda1
1 Universidade Estadual de Campinas
doi:10.20906/CPS/CILAMCE2017-0807
Resumo
Phononic crystals (PCs) are periodic elastic structures that exhibit interesting wave propagation properties such as band gaps, i.e., frequency bands where elastic waves cannot propagate. The periodicity may be implemented via geometrical and material periodic variations in one, two, or three dimensions. It has recently been shown that coupling two phononic crystals with different geometrical (topological) phase yields interface modes. In the case of one-dimensional elastic structures such as rods, interface modes appear in the second band gap. Interface modes are characterized by a high local amplification of the elastic deformation at the interface of two PCs. In this paper the use of the interface mode to locally amplify elastic energy to improve energy harvesting using a piezoelectric element is investigated. Numerical simulations using spectral finite elements are used. It is shown that a very high amplification of the voltage generated by the piezoelectric element is achieved compared with simply attaching a homogeneous rod to the piezoelectric element. The preliminary results show that interface modes have a good potential for elastic energy harvesting applications.
Palavras-chave: metamaterial; rod; band gap; piezoelectric