Bandwidth widening for sound absorption of a flexible microperforated panel backed by a multi-frequency panel-type resonator

Wai Yeen Yeang, Dunant Halim

Research output: Journal PublicationArticlepeer-review

3 Citations (Scopus)

Abstract

A microperforated panel (MPP) often suffers from a limited absorption bandwidth and poor sound absorption in the low frequency range. The present study aimed to propose an MPP-panel-type resonator (PR) compound structure that can simultaneously widen the half-absorption bandwidth and improve the poor absorption at the low frequency range. A vibroacoustic model is developed and compared to finite element simulations to demonstrate its accuracy. The vibration characteristics of the compound structure and the surface impedance are analyzed to reveal the mechanism forming the absorption characteristics of an MPP-PR structure. It is found that backing an MPP with a panel-type resonator (PR) creates a low frequency absorption peak but followed by an absorption valley that decreases the absorption bandwidth. The analysis showed that the phase difference between velocity of air particles in perforation and the PR panel velocity dictates the absorption characteristics associated with the PR resonance. A multi-resonators panel-type resonator (MPR) is found that the absorption valley associated with the host panel resonance splits into multiple smaller amplitude absorption dips improving absorption performance. The proposed MPP-MPR compound structure demonstrated a relatively wider half-absorption bandwidth with improved low frequency absorption.

Original languageEnglish
Pages (from-to)988-1001
Number of pages14
JournalJVC/Journal of Vibration and Control
Volume30
Issue number5-6
DOIs
Publication statusPublished Online - 1 Feb 2023

Keywords

  • coupled vibroacoustic system
  • microperforated panel
  • panel-type resonator
  • sound absorber

ASJC Scopus subject areas

  • General Materials Science
  • Automotive Engineering
  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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