Nonlocal acoustic metasurface for ultrabroadband sound absorption - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B Année : 2021

Nonlocal acoustic metasurface for ultrabroadband sound absorption

Yifan Zhu
Aurélien Merkel
Shiwang Fan
  • Fonction : Auteur
Liyun Cao
B. Assouar

Résumé

Classical meta-absorber designs usually have a tradeoff between bandwidth, efficiency, and thickness. Here, we introduce the concept of a nonlocal acoustic metasurface absorber by using a bridge structure connecting resonating unit cells to improve the performances of the meta-absorber. By utilizing the coupling effect between the adjacent unit cells, ultrabroadband sound absorption is achieved with deep-wavelength thickness. The physical mechanism of the nonlocal acoustic metasurface absorber is investigated and uncovered by developing analytical models. We theoretically and numerically study the nonlocal metasurface with a connecting bridge and the traditional metasurface without a bridge. The nonlocality can introduce three specific effects: the optimization of effective acoustic impedances, the shift of Fabry-Perot resonant frequencies, and the enhancement of the coupling effects between adjacent unit cells. These effects contribute to improve the bandwidth and the efficiency of the acoustic meta-absorber. We numerically and experimentally achieve an average absorption coefficient larger than 0.9 within the ultrabroadband bandwidth extending from about 600 to 2600 Hz, with a metasurface of 6.8 cm, viz., λ/9 for the lowest frequency. Our finding demonstrates the advantage of nonlocal acoustic metasurface to conceive a subwavelength sound meta-absorber
Fichier principal
Vignette du fichier
PRB 2021.pdf (2.89 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03412412 , version 1 (03-11-2021)

Identifiants

Citer

Yifan Zhu, Aurélien Merkel, Krupali Donda, Shiwang Fan, Liyun Cao, et al.. Nonlocal acoustic metasurface for ultrabroadband sound absorption. Physical Review B, 2021, 103 (6), pp.064102. ⟨10.1103/PhysRevB.103.064102⟩. ⟨hal-03412412⟩
16 Consultations
346 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More