Table 2 Semi-anechoic chamber specifications.
From: Effect of sound insulation on noise reduction in an agricultural tractor cab
Item | Specification | |
|---|---|---|
Dimension (width × length × height) | 18 m × 9 m × 7 m | |
Background noise | Stationary | 20Â dB(A) |
HVAC operation | 25Â dB(A) | |
Cut-off frequency | 63Â Hz (according to ISO 3745) | |
Natural frequency | 8Â Hz | |
Absorption material | Broad compact absorber (BCA) | |
