| Autor(es): |
Pasqual, A. M.
;
Cunha, L. R.
;
Rade, D. A.
;
Desmet, W
;
Pluymers, B
;
Moens, D
;
Vandemaele, S
Número total de Autores: 7
|
| 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. 8-pg., 2020-01-01. |
| Resumo | |
Electrodynamic loudspeakers can be used to absorb sound energy in a narrow frequency band around the loudspeaker resonance. To increase the operational bandwidth, active and passive impedance control techniques have been described in the literature. In this work, we propose a passive technique that makes use of a periodic array of small loudspeakers mounted as side branches along a straight duct. A larger loudspeaker is mounted at one end of the duct, which acts as a conventional narrow-band absorber. This system aims at absorbing the sound energy flowing inside the duct, leading to a small reflection coefficient at the entry of the periodic waveguide. We investigate the sound absorption of such a device through numerical simulations based on the transfer matrix method. The unit cell is made up of a one-dimensional acoustic waveguide with a side-branch loudspeaker. It is shown that the proposed approach might increase the absorption bandwidth, even with 1-inch loudspeakers and a number of cells as small as five in the periodic structure. (AU) | |
| 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 |