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 Hunton 30 cm Hunton 10 cm Rockwool lydplate 30 cm rockwool lydplate 10 cm
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: 0°
Porous model: Allard and Champoux (1992)
Helmholtz model: Ingard/Allard
Absorber Parameters
Absorber 1 (Hunton 30 cm)
300mm Porous Absorbent, 5000 Pa.s/m2
100mm Air
Rigid backing
Absorber 2 (Hunton 10 cm)
100mm Porous Absorbent, 5000 Pa.s/m2
100mm Air
Rigid backing
Absorber 3 (Rockwool lydplate 30 cm)
300mm Porous Absorbent, 27600 Pa.s/m2
100mm Air
Rigid backing
Absorber 4 (rockwool lydplate 10 cm)
100mm Porous Absorbent, 27600 Pa.s/m2
Rigid backing