Abstract
A plenum window with incorporation of Helmholtz resonators in between two glass panes was tested in a reverberation room. The effects of jagged flap on reducing strength of diffracted sound was also investigated in the present studies where white, traffic and construction noises were examined during each set of experiment. When the noise source was located at the central line of the plenum window, the plenum window with Helmholtz resonators was able to mitigate 8.5 dBA, 8.9 dBA and 8.2 dBA of white, traffic and construction noises, respectively, compared with the case of without window. These amounts of noises that attenuated by the plenum window were slightly higher than the case where noise source was diverged 30X away from the plenum window. The effects of jagged flaps on the acoustical performance of the plenum window were negligible. The Helmholtz resonators had the best performance in the frequency region between 900 Hz to 1300 Hz where in this frequency range, the plenum window with Helmholtz resonators was able to attenuate additional 1.7 dBA, 1.9 dBA and 1.6 dBA of white, traffic and construction noises, respectively, compared with the case of without resonators.Keywords:
plenum window, Helmholtz resonators, noise pollution, ventilationReferences
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2. Chen W., Rao W., Min H., Qiu X. (2011), An active noise barrier with unidirectional secondary sources, Applied Acoustics, 72, 969–974.
3. Everest F.A., Pohlmann K.C. (2009), Master handbook of acoustics, 5th Ed., Mc Graw Hill, New York.
4. Ford R., Kerry G. (1973), The sound insulation of partially open double glazing, Applied Acoustics, 6, 57–72.
5. Hu Z., Yang C., Cheng L. (2018), Acoustic resonator tuning strategies for the narrowband noise control in an enclosure, Applied Acoustics, 134, 88–96.
6. Liu S., Chen W., Zhang Y. (2014), Design optimization of porous fibrous material for maximizing absorption of sounds under set frequency bands, Applied Acoustics, 76, 319–328.
7. Menounou P., Busch-Vishniac I. (2000), Jagged edge noise barriers, Building Acoustics, 7, 179–200.
8. Palma M.J.C., Samagaio A. (2006), Acoustic performance of a noise barrier coated with an absorptive material, Noise Control Engineering Journal, 54, 245–250.
9. Sondergaard L.S., Olesen H.S. (2011), Investigation of sound insulation for a supply air window, In Forum Acusticum, pp. 1–6, Aolborg, Denmark.
10. Tang S.K., Tong Y.G., Tsui K.L. (2016), Sound transmission across a plenum window with an active noise cancellation system, Noise Control Engineering Journal, 64, 423–431.
11. Tong Y.G., Tang S.K. (2013), Plenum window insertion loss in the presence of a line source – A scale model study, Journal of The Acoustical Society of America, 133, 1458–1467.
12. Tong Y.G., Tang S.K. (2017), Acoustical benefits of plenum window as facade device – a parametric study, MATECWeb of Conferences, pp. 03021, Melaka, Malaysia.
13. Tong Y.G., Tang S.K., Kang J., Fung A., Yeung M.K.L. (2015), Full scale field study of sound transmission across plenum windows, Applied Acoustics, 89, 244–253.
14. Wu D., Zhang N. (2017), The improvement on noise attenuation performance of a duct-resonator system, Journal of Asian Architecture and Building Engineering, 16, 669–674.
15. Zhu J. et al. (2016), Gradient-structural optimization of metal fiber porous materials for sound absorption, Powder Technology, 301, 1235–1241.
16. Zhu X., Chen Z., Jiao Y., Wang Y. (2018), Broadening of the sound absorption bandwidth of the perforated panel using a membrane-type resonator, Journal of Vibration and Acoustics-Transactions of the ASME, 140, 031014.
