Three-dimensional numerical modelling of sound propagation in a long partial enclosure

S. H K Chu, Shiu Keung Tang

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

1 Citation (Scopus)

Abstract

The acoustical properties along a long rectangular partial enclosure with a circular sound source on the top wall of the duct centre are studied numerically using three-dimensional stimulations. The computational domain of interest is set to be a uniform cross section with a gap along the duct and the gap is connected to a free field environment. An absorptive portion is added to each end of the domain as non-reflecting termination. Sound propagating modes inside the rigid partial enclosure are identified. The gap radiates sound into the free space and distortion of mode shape is recognized at cross sections for various gap sizes. In-duct modal decomposition is adopted to analyze the computational data of sound pressure over the concerned internal cross sections. Contributions of discrete propagating modes are examined. Results show that the decaying rate of the amplitude of acoustic pressure along the duct axial direction correlates closely with the modal frequency and gap size.
Original languageEnglish
Title of host publication42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013
Subtitle of host publicationNoise Control for Quality of Life
PublisherOAL-Osterreichischer Arbeitsring fur Larmbekampfung
Pages3211-3217
Number of pages7
Volume4
ISBN (Print)9781632662675
Publication statusPublished - 1 Jan 2013
Event42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013 - Innsbruck, Austria
Duration: 15 Sep 201318 Sep 2013

Conference

Conference42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013
Country/TerritoryAustria
CityInnsbruck
Period15/09/1318/09/13

Keywords

  • Numerical model
  • Partial enclosure
  • Sound propagation

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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