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DINAME2019
DINAME2019
An integrated design method for Membrane-type Acoustic Metamaterials
Submission Author:
Lucas Yudi Moriya Sampaio , SP
Co-Authors:
Lucas Yudi Moriya Sampaio, Leopoldo de Oliveira
Presenter: Lucas Yudi Moriya Sampaio
doi://10.26678/ABCM.DINAME2019.DIN2019-0041
Abstract
Membrane-type acoustic metamaterials recently emerged as a reliable, compact and lightweight solution to acoustically impaired environments. With their unusual properties of negative mass and bulk modulus, a transmission loss performance superior to the one predicted by the mass-density law is feasible, asserting their certain role in modern acoustics. Since the first membrane acoustic metamaterial was proposed, several new concepts arose in the scientific community in order to improve its performance in terms of sound transmission loss level and bandgap extension. These concepts, although constructively different, contain in essence the three fundamental elements that characterize membrane acoustic metamaterials: a mass-, a stiffness- and a boundary-element. The combination of these elements defines a metamaterial’s cell, which can present different resonant properties according to the dynamic behavior of each component. The present work aims to explore this modular perspective in analyzing the existing membrane solutions, thus proposing new metamaterial concepts through the combination of desired element features. The influence of distinct spatial arrangements of metamaterial’s cells is also examined, since the bi-dimensional cellular membrane can be arranged layer- and/or panel-wise according to design requirements for different acoustic purposes.
Keywords
Acoustic Metamaterial, Acoustics, Vibro-acoustics, Sound Transmission Loss, Membrane, Resonator
