Acoustic Modelling
Porous Absorber Calculator
Helmholtz Absorber Calculator
Multi-layer Absorber Calculator
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100 200 500 1000 2000 5000 10000 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: 100Hz - 10000Hz
Scale: logarithmic
Resolution: medium

Angle of incidence: 0°
Porous model: Delany and Bazley (1970)
Helmholtz model: Ingard/Allard
Absorber Parameters
Absorber 1
100mm Porous Absorbent, 12650 Pa.s/m2
Rigid backing
Absorber 2
100mm Porous Absorbent, 18000 Pa.s/m2
Rigid backing
Absorber 3
100mm Porous Absorbent, 36000 Pa.s/m2
Rigid backing
Absorber 4
100mm Porous Absorbent, 6000 Pa.s/m2
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.