Drum-like liners to attenuate low frequencies in presence of flow: an analytical, experimental and numerical study

Charlotte Comte, Thomas Humbert, Yves Aurégan, Gwénaël Gabard, Garret C.Y. Lam, Randolph C.K. Leung

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

Over the last twenty years, many ideas have been suggested to design sub-wavelength absorbers that couple a classical single-degree of freedom liner with a vibrating part that resonates at low frequencies. In this paper, the acoustic behaviour of a light and thin sound absorber composed of an elastic latex membrane placed on top of a closed 3D-printed cavity is studied. It is found experimentally and analytically that membrane modes imply a great shift of the cavity resonance towards the low frequencies and add several supplementary transmission drops. To investigate the effects of flow, numerical time-domain simulations are conducted and validated after comparisons with experimental data. The three approaches show that membrane absorbers are highly resistive, with a weak sensibility against flow and non linear effects. They are thus well-suited for absorption purposes in aeronautic applications.

Original languageEnglish
Title of host publication28th AIAA/CEAS Aeroacoustics Conference, 2022
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
ISBN (Print)9781624106644
DOIs
Publication statusPublished - 13 Jun 2022
Event28th AIAA/CEAS Aeroacoustics Conference, 2022 - Southampton, United Kingdom
Duration: 14 Jun 202217 Jun 2022

Publication series

Name28th AIAA/CEAS Aeroacoustics Conference, 2022

Conference

Conference28th AIAA/CEAS Aeroacoustics Conference, 2022
Country/TerritoryUnited Kingdom
CitySouthampton
Period14/06/2217/06/22

ASJC Scopus subject areas

  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering

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