Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
On The Acoustic Radiation of a 1D Piezoelectric Metastructure
Submission Author:
Gabriel Konda Rodrigues , SP
Co-Authors:
Gabriel Konda Rodrigues, Jaime Alberto Mosquera Sanchez, Carlos De Marqui Junior, Leopoldo de Oliveira
Presenter: Gabriel Konda Rodrigues
doi://10.26678/ABCM.COBEM2019.COB2019-0794
Abstract
As sound pollution becomes a serious concern nowadays, engineers and researchers are looking for ways to directly deal with the noise sources for blocking its propagation. In this regard, Acoustic Metamaterials (AMM) constitute an interesting strategy for dealing with sound propagation, once that they are capable of creating a stop band at which mechanical waves cannot propagate, thus reducing transmission and/or noise levels. This paper proposes an acoustic field study and further analyses on the sound transmission loss (STL) through a acoustic metastructure that features piezoelectric-based circuit attachments. It is seen that the electrical attachments provide the mechanical structure with improved, adaptive features, e.g. band gap broadening and multifrequency targeting, which allows the designer to tackle a variety of noises, whose frequency distribution can vary. While vibroacoustic analyses on the radiated sound field are ongoing, the experimental results obtained on the proposed 1D structure demonstrate effective wave propagation blocking at a given frequency bandwidth.
Keywords
Smart material, locally resonant metamaterial, Sound Transmission Loss, shunt piezoelectric circuits
