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
Absorption
Coefficient
Reflection
Coefficient
Impedance
(real)
Impedance
(imag)
Amend
Parameters
Global Parameters
Air temperature: 22°C
Air pressure: 101325 Pa

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

Angle of incidence: 0°
Porous model: Komatsu (2008)
Helmholtz model: Ingard/Allard
Absorber Parameters
Absorber 1
Limp Membrane, 5 Kg/m2
25mm Porous Absorbent, 15000 Pa.s/m2
200mm Air
Rigid backing
Absorber 2
Limp Membrane, 5 Kg/m2
200mm Air
25mm Porous Absorbent, 15000 Pa.s/m2
Rigid backing
Absorber 3
Rigid backing
Absorber 4
Rigid backing
Absorber 1: Peak absorption at 53.3Hz. Damping=0.51 (low)

Absorber 2: Peak absorption at 54.8Hz. Damping=0.03 (very low)

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.