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 language | English |
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Title of host publication | 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013 |
Subtitle of host publication | Noise Control for Quality of Life |
Publisher | OAL-Osterreichischer Arbeitsring fur Larmbekampfung |
Pages | 3211-3217 |
Number of pages | 7 |
Volume | 4 |
ISBN (Print) | 9781632662675 |
Publication status | Published - 1 Jan 2013 |
Event | 42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013 - Innsbruck, Austria Duration: 15 Sept 2013 → 18 Sept 2013 |
Conference
Conference | 42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013 |
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Country/Territory | Austria |
City | Innsbruck |
Period | 15/09/13 → 18/09/13 |
Keywords
- Numerical model
- Partial enclosure
- Sound propagation
ASJC Scopus subject areas
- Acoustics and Ultrasonics