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 OC703 100mm No Air Gap OC703 50mm 50mm Air Gap
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: high

Angle of incidence: 0°
Porous model: Komatsu (2008)
Helmholtz model: Ingard/Allard
Absorber Parameters
Absorber 1 (OC703 100mm No Air Gap)
100mm Porous Absorbent, 23600 Pa.s/m2
Rigid backing
Absorber 2 (OC703 50mm 50mm Air Gap)
50mm Porous Absorbent, 23600 Pa.s/m2
50mm Air
Rigid backing
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.