Schematic illustrations of (a) an ordinary balcony and (b) the noise-shielding balcony introduced in this paper.
Considered sound filed around a high-rise building façade with an infinitely periodical form.
Geometry of the analysis model for an infinitely periodical structure and definitions of symbols.
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.
Normal absorption coefficient applied to the absorbing ceiling surface in analyses for the “absorbing” balcony.
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°.
A-weighted road traffic noise spectrum described in the ASJ RTN-Model 2003 (Ref. 11).
Calculated mean A-weighted SPL reduction as a function of noise incident angle using the road traffic noise spectrum shown in Fig. 7.
Constitution of a 1/10-scale model of a high-rise dwelling façade consisting of 6 intermediate floors 3 dwelling units.
Source positions for scale-model experiments: and denote vertical and horizontal incident angle, respectively.
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°.
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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