Lightweight decorated membrane panels for sound isolation

Author(s)

Sampaio, L. Y. M. ; Cerantola, P. C. M. ; de Oliveira, L. P. R. ; Desmet, W ; Pluymers, B ; Moens, D ; Vandemaele, S

• Document type: Journal article
• Source: PROCEEDINGS OF INTERNATIONAL CONFERENCE ON NOISE AND VIBRATION ENGINEERING (ISMA2020) / INTERNATIONAL CONFERENCE ON UNCERTAINTY IN STRUCTURAL DYNAMICS (USD2020); v. N/A, p. 13-pg., 2020-01-01.

Abstract

The need for energy efficient vehicles and machines, often drive performance design towards mass reduction, which can have a negative impact on noise and vibration. Metamaterials are recently being studied as a possible solution to tackle this classical acoustic problem with less added mass, promising attenuation at least in narrow frequency bands. This work presents such a solution, which is based on variations of the so-called decorated membrane acoustic metamaterials (MAMs). Such devices are only effective at a specific frequencies. In this work, the design and performance assessment of unit cells that combine different membranes, which can be combined on a periodic lattice, is addressed. Unit cells are experimentally tested on transmission loss in order to validate the numerical models. The geometrical concept of tessellation is used to derive the complete MAM panel. This study shows the formation of an attenuation band around the membranes designed frequencies, thus realizing a metamaterial that outperforms traditional mass law. (AU)

• FAPESP's process: 18/05793-2 - Acoustic treatment via membrane-type metamaterials
• Grantee: Lucas Yudi Moriya Sampaio
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 18/15894-0 - Periodic structure design and optimization for enhanced vibroacoustic performance: ENVIBRO
• Grantee: Carlos de Marqui Junior
• Support Opportunities: Research Projects - Thematic Grants