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Aurégan Y, Farooqui M, Groby JP. Low frequency sound attenuation in a flow duct using a thin slow sound material. J Acoust Soc Am. 2016;139(5):EL149doi: 10.1121/1.4951028.
Aurégan, Y., Farooqui, M., & Groby, J. P. (2016). Low frequency sound attenuation in a flow duct using a thin slow sound material. The Journal of the Acoustical Society of America, 139(5), EL149. https://doi.org/10.1121/1.4951028
Aurégan, Yves, et al. "Low frequency sound attenuation in a flow duct using a thin slow sound material." The Journal of the Acoustical Society of America vol. 139,5 (2016): EL149. doi: https://doi.org/10.1121/1.4951028
Aurégan Y, Farooqui M, Groby JP. Low frequency sound attenuation in a flow duct using a thin slow sound material. J Acoust Soc Am. 2016 May;139(5):EL149. doi: 10.1121/1.4951028. PMID: 27250200.
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J Acoust Soc Am. 2016 May;139(5):EL149. doi: 10.1121/1.4951028.

Low frequency sound attenuation in a flow duct using a thin slow sound material.

The Journal of the Acoustical Society of America

Yves Aurégan, Maaz Farooqui, Jean-Philippe Groby

Affiliations

  1. Laboratoire d'Acoustique de l'Université du Maine, Unite Mixte de Recherche 6613, Centre National de la Recherche Scientifique, Av. O Messiaen, F-72085 LE MANS Cedex 9, France [email protected].
  2. Sound and Vibration Laboratory, Faculty of Engineering, Ain Shams University, 11517 Cairo, Egypt [email protected].
  3. Laboratoire d'Acoustique de l'Université du Maine, Unite Mixte de Recherche 6613, Centre National de la Recherche Scientifique, Av. O Messiaen, F-72085 LE MANS Cedex 9, France [email protected].

PMID: 27250200 DOI: 10.1121/1.4951028

Abstract

A thin subwavelength material that can be flush mounted in a duct and that gives an attenuation band at low frequencies in air flow channels is presented. To decrease the material thickness, the sound is slowed in the material using folded side branch tubes. The impedance of the material is compared to the optimal value given by the Cremer condition, which can differ greatly from the air characteristic impedance. Grazing flow on this material increases the losses at the interface between the flow and the material.

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