Title: Investigation of liner and duct geometry discontinuities on the attenuation of resonator Helmholtz lined duct element

Authors: Raja Dhief; Mohamed Taktak; Mabrouk Chaabane; Mohamed Haddar

Addresses: Laboratory of Mechanics, Modeling and Production, Mechanical Engineering Department, National School of Engineers of Sfax, BP 1173 – 3038, Sfax, Tunisia; Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia ' Laboratory of Mechanics, Modeling and Production, Mechanical Engineering Department, National School of Engineers of Sfax, BP 1173 – 3038, Sfax, Tunisia; Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia ' Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia ' Laboratory of Mechanics, Modeling and Production, Mechanical Engineering Department, National School of Engineers of Sfax, BP 1173 – 3038, Sfax, Tunisia

Abstract: In this study, the acoustic performance of the liner characteristics coupled with geometric discontinuities on the acoustic attenuation of a lined duct is investigated. The model is based on the computation of the scattering matrix. The liner is composed of a perforated plate with an air cavity backed by a rigid wall plate. The parametric study was conducted for six configurations, including cases of sudden or progressive narrowing and widening of the duct radius. The numerical results show the relative influence of the variation of each parameter, and of each type of radius discontinuities of ducts on the acoustic power attenuation.

Keywords: acoustic lining; cylindrical duct; discontinuity effect; acoustic attenuation.

DOI: 10.1504/IJVNV.2022.125604

International Journal of Vehicle Noise and Vibration, 2022 Vol.18 No.1/2, pp.77 - 101

Received: 19 Apr 2021
Accepted: 13 Sep 2021
Published online: 16 Sep 2022 *

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