Lightweight decorated membrane panels for sound isolation

Autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: 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.

Resumo

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)

• Processo FAPESP: 18/05793-2 - Tratamento acústico com metamateriais de membrana
• Beneficiário: Lucas Yudi Moriya Sampaio
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 18/15894-0 - Projeto e otimização de estruturas periódicas para aprimoramento de desempenho vibroacústico
• Beneficiário: Carlos de Marqui Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático