The use of microperforated plates to attenuate cavity resonances

Benjamin Fenech, Graeme Keith, Finn Jacobsen

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Abstract

The use of microperforated plates to introduce damping in a closed cavity is examined. By placing a microperforated plate well inside the cavity instead of near a wall as traditionally done in room acoustics, high attenuation can be obtained for specific acoustic modes, compared with the lower attenuation that can be obtained in a broad frequency range with the conventional position of the plate. An analytical method for predicting the attenuation is presented. The method involves finding complex eigenvalues and eigenfunctions for the modified cavity and makes it possible to predict Green's functions. The results, which are validated experimentally, show that a microperforated plate can provide substantial attenuation of modes in a cavity. One possible application of these findings is the treatment of boiler tones in heat-exchanger cavities.
Original languageEnglish
JournalAcoustical Society of America. Journal
Volume120
Issue number4
Pages (from-to)1851-1858
ISSN0001-4966
DOIs
Publication statusPublished - 2006

Bibliographical note

Copyright (2006) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.

Keywords

  • attenuation
  • Microperforated plates
  • modes
  • resonances

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