| Autor: |
Kone, Tenon Charly, Ghinet, Sebastian, Panneton, Raymond, Laly, Zacharie, Mechefske, Christopher, Grewal, Anant |
| Předmět: |
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| Zdroj: |
INTER-NOISE & NOISE-CON Congress & Conference Proceedings; 2023, Vol. 265 Issue 3, p609-617, 9p |
| Abstrakt: |
The simultaneous control of multiple tonal frequencies and broadband noise, at low frequencies a challenge for the aerospace, ground transportation and building industries. The technologies proposed in the literature, using layered porous materials with embedded Helmholtz resonators HR) with a structured neck, exhibited considerable potential when tuned at tonal, multi-tonal, or narrow frequency bands. However, the resonance frequencies due to the structured necks of the metamaterial are narrow. Our recent investigations have shown that parallel arrangements of several structured metamaterials separated by membranes can broaden the resonance frequencies and increase the number of resonance frequencies to be controlled. This paper presents a parallel assembly of four sub-metamaterials structured and separated by membranes. Each of these sub-metamaterials is also a serial assembly of a periodic unit cell with a half-neck + cavity + half-neck configuration. The metamaterial is embedded in a layer of fiberglass. Comsol's coupled sound pressure and shell approaches in the frequency domain were used to predict the sound absorption coefficient of the metamaterial. The results obtained show a widening of the absorption frequency peaks and the appearance of additional frequencies due to the membranes. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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