Acoustic Modelling
Porous Absorber Calculator
Helmholtz Absorber Calculator
Multi-layer Absorber Calculator
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20 50 100 200 500 1000 2000 5000 10000 20000 Frequency (Hz) 0 0.2 0.4 0.6 0.8 1 Absorption Coefficient 10cm rockfon 10cm luft 250mm rockwool flexi-a
Absorption
Coefficient
Reflection
Coefficient
Impedance
(real)
Impedance
(imag)
Amend
Parameters
Global Parameters
Air temperature: 20°C
Air pressure: 101325 Pa

X Axis: Frequency
Range: 20Hz - 20000Hz
Scale: logarithmic
Resolution: medium

Angle of incidence: 45°
Porous model: Komatsu (2008)
Helmholtz model: Ingard/Allard
Absorber Parameters
Absorber 1 (10cm rockfon 10cm luft)
100mm Porous Absorbent, 21400 Pa.s/m2
100mm Air
Rigid backing
Absorber 2 (250mm rockwool flexi-a)
250mm Porous Absorbent, 9000 Pa.s/m2
Rigid backing
Absorber 1: Peak absorption at 12329Hz. Damping=1.34 (high)

Absorber 2: Peak absorption at 5187Hz. Damping=1.34 (high)

Dotted lines indicate that the model used to estimate absorber properties has been used outside of its applicable range. Results may therefore be less accurate than where a solid line is displayed.