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Manipulating Papua New Guinea Balsa by Design for Acoustic Absorption in the Built Environment
Citation
Kotlarewski, N and Kuys, B and Ozarska, B and Holloway, D, Manipulating Papua New Guinea Balsa by Design for Acoustic Absorption in the Built Environment, Proceedings of the 2018 Society of Wood Science and Technology/Japan Wood Research Society International Convention, 5-9 November 2018, Nagoya University, pp. 278-288. ISBN 978-0-9817876-8-8 (2018) [Non Refereed Conference Paper]
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Official URL: http://www.swst.org/wp/meeting/2018-swstjwrs-inter...
Abstract
This study extends the knowledge of acoustic absorption properties of
Papua New Guinea (PNG) balsa in three experimental stages for architectural
applications in the built environment to improve the wellness of occupants. Stage one
tested balsa as a stand-alone material in impedance tubes according to ISO 10534-2. The
results indicated PNG balsa has low absorption properties across 100 to 5000 Hz in 1/3rd
Octave-band centre frequencies. The largest arithmetic average of alpha (αSTAT)
calculated was 0.20 from testing 25 mm thick end-grain balsa with a measured density of
87.5 kg/m3 (average of three discrete samples) and the lowest 0.05 from testing 50 mm
thick perpendicular-grain balsa with a measured density of 112.5 kg/m3. Stage two tested
balsa composite panels in a reverberation chamber according to AS ISO 354 and AS ISO
11654. The results highlighted the noise reduction coefficient and weighted sound
absorption coefficient of two differently laminated composite panels was 0.75 and 0.80
αw and 0.75 and 0.75 αw respectively. Both composite panels had an identical perforated
open area pattern and a type E-400 mount with an additional 100 mm insulation installed
to the underside of the panel. The final stage, tested balsa composite panels in a
commercial fit-out. The results presented an average reduction in reverberation time was
0.26 seconds, corresponding to an effective absorption coefficient of 0.47. This research
concludes that well designed PNG balsa panels can provide a broad spectrum sound
absorption, thus providing a comfortable acoustic environment for occupants.
Item Details
| Item Type: | Non Refereed Conference Paper |
|---|---|
| Keywords: | acoustics, sound absorption, design, balsa wood. |
| Research Division: | Built Environment and Design |
| Research Group: | Design Practice and Management |
| Research Field: | Design Innovation |
| Objective Division: | Expanding Knowledge |
| Objective Group: | Expanding Knowledge |
| Objective Field: | Expanding Knowledge in Built Environment and Design |
| UTAS Author: | Kotlarewski, N (Dr Nathan Kotlarewski) |
| UTAS Author: | Holloway, D (Mr Donald Holloway) |
| ID Code: | 129207 |
| Year Published: | 2018 |
| Deposited By: | Architecture and Design |
| Deposited On: | 2018-11-15 |
| Last Modified: | 2018-11-15 |
| Downloads: | 0 |
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