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Traffic noise reduction at balconies on a high-rise building façade
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Image of FIG. 1.
FIG. 1.

Schematic illustrations of (a) an ordinary balcony and (b) the noise-shielding balcony introduced in this paper.

Image of FIG. 2.
FIG. 2.

Considered sound filed around a high-rise building façade with an infinitely periodical form.

Image of FIG. 3.
FIG. 3.

Geometry of the analysis model for an infinitely periodical structure and definitions of symbols.

Image of FIG. 4.
FIG. 4.

Constitution of tested balconies. (a) “Normal” an ordinary balcony; (b) “type 1” with reflector 1; (c) “type 2” with reflectors 1 and 2; (d) “absorbing” with absorber applied to the ceiling.

Image of FIG. 5.
FIG. 5.

Normal absorption coefficient applied to the absorbing ceiling surface in analyses for the “absorbing” balcony.

Image of FIG. 6.
FIG. 6.

Calculated spectra of mean SPL reductions for balconies shown in Figs. 4(b)–4(d) compared to a “normal” balcony at noise incident angles of (a) 30°, (b) 45°, (c) 60° and (d) 75°.

Image of FIG. 7.
FIG. 7.

A-weighted road traffic noise spectrum described in the ASJ RTN-Model 2003 (Ref. 11).

Image of FIG. 8.
FIG. 8.

Calculated mean A-weighted SPL reduction as a function of noise incident angle using the road traffic noise spectrum shown in Fig. 7.

Image of FIG. 9.
FIG. 9.

Constitution of a 1/10-scale model of a high-rise dwelling façade consisting of 6 intermediate floors 3 dwelling units.

Image of FIG. 10.
FIG. 10.

Source positions for scale-model experiments: and denote vertical and horizontal incident angle, respectively.

Image of FIG. 11.
FIG. 11.

Experimental spectra of mean SPL reduction for type 1 and type 2 balconies compared to a “normal” balcony for the source points of ° and (a) 30°, (b) 45°, and (c) 60°.


Generic image for table

Experimental results of relations between noise incident angle and mean A-weighted SPL reductions [in dB(A)] using the road traffic noise spectrum shown in Fig. 7. Calculated results shown in Fig. 8 are also shown in the column “2D.”


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Traffic noise reduction at balconies on a high-rise building façade