Eventos Anais de eventos
DINAME 2017
XVII International Symposium on Dynamic Problems of Mechanics
Investigating Interface Modes on Periodic Acoustic Waveguides and Elastic Rods Using Spectral Elements
Submission Author:
Matheus Inguaggiato Nora Rosa , SP
Co-Authors:
Matheus Inguaggiato Nora Rosa, José Arruda, Massimo Ruzzene
Presenter: Matheus Inguaggiato Nora Rosa
doi://10.26678/ABCM.DINAME2017.DIN17-0214
Abstract
Phononic crystals and acoustic metamaterials are periodic structures that have drawn much attention of the engineering and physics communities due to their numerous applications in passive vibration and noise control. In this context, some geometric-phase concepts originally developed in electronics have inspired a number of applications in photonics and phononics. These concepts allow the manipulation of the topological behavior, such as edge modes or interface modes, as a result of the non-trivial topology of the band structure of the material. For acoustic systems, it has been recently shown that interface modes appear at the boundary separating two phononic crystals having different band-gap topological characteristics, which can be explained in terms of the geometric phase called Zak phase. In this paper, one-dimensional spectral elements are used to reproduce and investigate the interface modes present on these acoustic systems, as well as to show they can also be found in similar periodic systems such as elastic rods. Wave confinement at an interface can have useful applications in both acoustic systems (e.g. local sound enhancement) and elastic structures (e.g. energy harvesting).
Keywords
Phononic Crystals, interface models, acoustic waveguides, elastic rods, spectral elements
