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Plenum window insertion loss in the presence of a line source—A scale model study
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10.1121/1.4788996
/content/asa/journal/jasa/133/3/10.1121/1.4788996
http://aip.metastore.ingenta.com/content/asa/journal/jasa/133/3/10.1121/1.4788996
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Experimental model setup, its dimensions (in mm) and the nomenclature adopted.

Image of FIG. 2.
FIG. 2.

Average reverberation times measured inside receiver chamber. w/L = 0.1 (open circle); w/L = 0.25 (open square); w/L = 0.5 (open triangle); opened window (closed circle); closed window (closed square). d/L = 0.1.

Image of FIG. 3.
FIG. 3.

Definition of orientation angle θ.

Image of FIG. 4.
FIG. 4.

IL calculation reference for the “Unrestricted building facade orientation” cases.

Image of FIG. 5.
FIG. 5.

Angular variation of IL for cases with fixed window orientation relative to the line source. w/L = 0.5 (open circle); w/L = 0.25 (open square); w/L = 0.1 (open triangle); window closed (open diamond); Open symbol, d/L = 0.1; gray symbol, d/L = 0.15; closed symbol, d/L = 0.2.

Image of FIG. 6.
FIG. 6.

Examples of one-third octave band sound reduction indices for cases with fixed window orientation relative to the line source. (a) w/L = 0.5; (b)w/L = 0.1. θ = θmax (open circle); θ = −45° (open square); θ = −90° (open triangle); θ = +45° (open inverted triangle); θ = +90° (open diamond). Open symbol, d/L = 0.2; closed symbol, d/L = 0.1.

Image of FIG. 7.
FIG. 7.

(Color online) Narrow band sound spectra and insertion losses with a frequency resolution of 2 Hz. (a) Average sound spectra inside the receiver chamber; (b) Insertion loss. Opened window, θ = +20° (solid line); Opened window, θ = −20° (dot dashed line); w/L = 0.5, d/L = 0.2, θ = +20° (dashed line); w/L = 0.1, d/L = 0.1, θ = −20° (double dotted dashed line).

Image of FIG. 8.
FIG. 8.

Angular variation of IL for cases for “Unrestricted building facade orientation” cases. Legends are the same as those of Fig. 5 .

Image of FIG. 9.
FIG. 9.

Effect of source view angle on the IL. Regression line (solid line); (dashed line). The other legends are the same as those of Fig. 5 .

Image of FIG. 10.
FIG. 10.

Examples of one-third octave band noise reduction for “Unrestricted building facade orientation” cases. (a) w/L = 0.5; (b) w/L = 0.1. The legends are the same as those of Fig. 6 , but with θmax defined to be the θ of the highest IL for .

Image of FIG. 11.
FIG. 11.

One-third octave band noise reduction due to facade orientation. θ = 30° (open circle); θ = 45° (open square); θ = 60° (open triangle); θ = 70° (open inverted triangle); θ = 80° (open diamond).

Image of FIG. 12.
FIG. 12.

Examples of simulated sound pressure level distribution maps.

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/content/asa/journal/jasa/133/3/10.1121/1.4788996
2013-03-06
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Plenum window insertion loss in the presence of a line source—A scale model study
http://aip.metastore.ingenta.com/content/asa/journal/jasa/133/3/10.1121/1.4788996
10.1121/1.4788996
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