Open Access
Table A1
Sound absorption coefficients for the materials of the different models of courtyards (Models: G: generic models; Z and M: real world models).
| Material | Frequency in Hz | Used in model | |||||||
|---|---|---|---|---|---|---|---|---|---|
| 63 | 125 | 250 | 500 | 1k | 2k | 4k | 8k | ||
| Absorbing facade/balcony soffit | 0.25 | 0.25 | 0.55 | 0.85 | 0.90 | 0.80 | 0.75 | 0.75 | all |
| Brick wall | 0.02 | 0.02 | 0.03 | 0.03 | 0.04 | 0.05 | 0.07 | 0.07 | generic and Z |
| Windows | 0.18 | 0.18 | 0.06 | 0.04 | 0.03 | 0.02 | 0.02 | 0.02 | all |
| Smooth concrete (balconies & privacy screen) | 0.01 | 0.01 | 0.01 | 0.02 | 0.02 | 0.02 | 0.05 | 0.05 | all |
| Rough concrete (reflective floor) | 0.02 | 0.02 | 0.03 | 0.03 | 0.03 | 0.04 | 0.07 | 0.07 | all |
| Lawn | 0.15 | 0.15 | 0.25 | 0.40 | 0.55 | 0.60 | 0.60 | 0.60 | all |
| Plastered brick wall | 0.01 | 0.01 | 0.01 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | M |
| Gravel floor | 0.07 | 0.07 | 0.12 | 0.20 | 0.27 | 0.30 | 0.30 | 0.30 | Z |
| Stone slabs | 0.01 | 0.01 | 0.01 | 0.015 | 0.02 | 0.02 | 0.02 | 0.02 | M |
| Wood (benches) | 0.05 | 0.05 | 0.08 | 0.10 | 0.12 | 0.12 | 0.12 | 0.12 | M and Z |
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