Sound attenuation of a periodic array of micro-perforated tube mufflers

Xiaofeng Shi, Cheuk Ming Mak

Research output: Journal article publicationJournal articleAcademic researchpeer-review

38 Citations (Scopus)

Abstract

Because of the high acoustic resistance and low mass reactance due to the sub-millimeter perforation, the micro-perforated muffler can provide considerable sound attenuation of duct noise. Multiple mufflers are often used to enhance attenuation performance. When mufflers are distributed periodically in a duct, the periodic structure produces special dispersion characteristics in the overall sound transmission loss. The Bloch wave theory and the transfer matrix method are used to study the wave propagation in periodic micro-perforated tube mufflers and the dispersion characteristics of periodic micro-perforated mufflers are examined. The results predicted by the theory are compared with finite element method simulation and experimental results. The results indicate that the periodic structure can influence the performance of micro-perforated mufflers. With different periodic distances, the combination of the periodic structure and the micro-perforated tube muffler can contribute to the control of lower frequency noise with a broader frequency range or improvement of the peak transmission loss around the resonant frequency.
Original languageEnglish
Pages (from-to)15-22
Number of pages8
JournalApplied Acoustics
Volume115
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • Micro-perforated muffler
  • Periodic structure
  • Transmission loss

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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